http://www.slacky.eu/wikislack/index.php?title=Djbdns_on_Slackware:_l'alternativa_al_BIND&feed=atom&action=historyDjbdns on Slackware: l'alternativa al BIND - Cronologia2013-06-19T12:48:41ZCronologia della pagina su questo sitoMediaWiki 1.20.3http://www.slacky.eu/wikislack/index.php?title=Djbdns_on_Slackware:_l%27alternativa_al_BIND&diff=3187&oldid=prevChrix: /* Note finali */2006-11-09T20:34:08Z<p><span dir="auto"><span class="autocomment">Note finali</span></span></p>
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<td style="background: #eee; color:black; font-size: smaller;"><div>= Note finali =</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* Il presente documento è a semplice scopo divulgativo </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* L'autore non si assume la responsabilità di eventuali danni diretti o indiretti derivanti dall'uso dei programmi, o dall'applicazione delle configurazioni menzionate nel seguente articolo </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* I marchi citati sono di proprietà dei rispettivi proprietari e sono stati utilizzati solo a scopo didattico o divulgativo. </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* L'uso o il riutilizzo del presente articolo è liberamente consentito per scopi didattici o informativi previa citazione della fonte </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* Sono possibili errori o imprecisioni, segnalatemele a [mailto:pavan@netlink.it pavan@netlink.it]</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* Chi volesse integrare il presente documento, può scrivere a [mailto:pavan@netlink.it pavan@netlink.it]</div></td>
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</table>Chrixhttp://www.slacky.eu/wikislack/index.php?title=Djbdns_on_Slackware:_l%27alternativa_al_BIND&diff=3186&oldid=prevChrix: /* Note */2006-11-09T20:32:48Z<p><span dir="auto"><span class="autocomment">Note</span></span></p>
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<td style="background: #eee; color:black; font-size: smaller;"><div>= Note =</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Questo breve documento può essere di aiuto per una prima installazione e per capire le funzionalità di questo</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>programma, ma per una sua completa configurazione, onde evitare errori che possono compromettere il sistema,</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>ricordiamo la lettura della documentazione ufficiale: http://cr.yp.to/djbdns.html</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>e dell'HOWTO di Luca Morettoni: http://morettoni.net/docs/djbdns.html</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>e anche di "Life with djbdns" by Bennett Todd: http://www.lifewithdjbdns.org </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>dove si trovano informazioni sulle altre funzionalità di djbdns non trattata in questo breve documento</div></td>
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</table>Chrixhttp://www.slacky.eu/wikislack/index.php?title=Djbdns_on_Slackware:_l%27alternativa_al_BIND&diff=3185&oldid=prevChrix: /* Installazione di Tinydns */2006-11-09T20:30:46Z<p><span dir="auto"><span class="autocomment">Installazione di Tinydns</span></span></p>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>La seconda necessità consiteva nel rendere il dns in grado di gestire un dominio, in pratica essere autoritario per la zona.</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>In questo caso sitratta quindi di risolvere i nomi di host interni ad una specifica zona, operazione per cui viene utilizzato</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>'''tinydns''', il cui compito specifico è proprio questo.</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Questo programma è forse il più importante, ed è quello del pacchetto djbdns, che ci consente di svolgere pienamente</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>le funzioni di un dns server. ovviamente di far girare tinydns e dnscache sullo stesso sistema può creare un problema dovuto</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>al fatto che entrambi sono in ascolto sulla stessa porta, per cui è bene creare un '''ip alias''' su cui far girare tinydns.</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Quindi avremo:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> ifconfig eth1:0 192.168.17.227 netmask 255.255.255.0</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>come per dnscache si crea un account specifico</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> useradd -g dns -s /bin/false -d /dev/null tinydns </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Il servizio tinydns viene creato con tinydns-conf in modo simile a quanto visto prima per dnscache:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> tinydns-conf tinydns dnslog /usr/local/etc/tinydns 192.168.17.227</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>il servizio si avvia con il solito link simbolico:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> ln -s /usr/local/etc/tinydns /service</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>I servizi attivi che dovremmo avere sono questi:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/# ps -ax | grep dns</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> 4616 ? S 0:00 supervise dnscache</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> 4618 ? S 0:00 /usr/local/bin/dnscache</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> 6172 ? S 0:00 supervise dnscache_external</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> 6174 ? S 0:00 /usr/local/bin/dnscache</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>A questo punto dobbiamo costruire i nostri file di zona, un pò come avremmo fatto con il BIND. In realtà la sintassi è un pò</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>diversa, anche se tutto sommato la logica resta quella. In più djbdns ci mette a disposizione una serie di comandi che</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>semplificano la creazione delle nostre zone.</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Sotto '''/usr/local/etc/tinydns/root''' troveremo una serie di script specifici:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* add-ns: aggiunge il record per il Name Server</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* add-host: aggiunge un host</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* add-mx: aggiunge un record MX (Mail eXchanger)</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* add-alias: aggiunge un alias per un host</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* add-childdns</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>proviamo ad inserire qualche host della rete</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> cd /usr/local/etc/tinydns/root</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> #Aggiungo il record per il Name Server</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> ./add-ns .192.168.17.227 # è il Name Server</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> #Aggiungo un host della mia rete</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> ./add-host server2.dominio.it 192.168.17.9</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> #Aggiungo un IP di un host della rete (Reversal)</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> ./add-host .0.17.168.192.in-add.arpa 192.168.17.227</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> #Aggiungo un alias per un IP della mia rete</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> #Compilo il file di zona</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> make</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Il comando make da lanciare alla fine, compila il file di zona con un formato '''.cdb''' specifico di tinydns, che rende </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>la lettura dei file di zona molto più veloce rispetto ai normali file di testo del BIND</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>A questo punto per poter utilizzare entrambi i servizi sul sistema ed avviare sia la risoluzione per i domini esterni che per</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>gli host della zona interna occore far dialogare dnscache e tinydns, in modo che uno passi le query all'altro. Per fare questo</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>occore creare i seguenti file nelle root directory di dnscache e dnscache_external, in modo che questo consulti anche </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>il dns server che risponde sull'IP alias, nel nostro caso 192.168.17.227:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> echo 192.168.17.227 > /usr/local/etc/dnscache/root/servers/dominio.it</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> echo 192.168.17.227 > /usr/local/etc/dnscache/root/servers/17.168.192.in-addr.arpa</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> echo 192.168.17.227 > /usr/local/etc/dnscache_external/root/servers/dominio.it</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> echo 192.168.17.227 > /usr/local/etc/dnscache_external/root/servers/17.168.192.in-addr.arpa</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>A questo punto occore riavviare i servizi</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> svc -t /service/dnscache</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> svc -t /service/dnscache_external</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> svc -t /service/tinydns</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Adesso possiamo provare a risolvere gli host della nostra rete</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/# nslookup -silent www.dominio.it</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Server: 127.0.0.1 </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address: 127.0.0.1#53</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Non-authoritative answer:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Name: www.dominio.it</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address 192.168.17.9</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/# nslookup -silent www.linux.com</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Server: 127.0.0.1 </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address: 127.0.0.1#53</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Non-authoritative answer:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Name: www.linux.com</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address 66.35.250.170</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Un ultimo strumento che mi sento di consigliarvi e che ho utilizzato è '''axfr-get''', in abbinamento con '''tcpclient'''</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>che fa parte del pacchetto '''ucspi-tcp''' ed è prelevabile da:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>http://cr.yp.to/ucspi-tcp.html</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Questo programma consente di trasferire una zona da un server DNS (BIND) che consenta lo zone transfer, </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>generando un file contenente le informazioni della zona, in un formato compatibile con tinydns:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/etc/tinydns/root# tcpclient nameserver 53 axfr-get zona_int zona_int.txt zona_int.tmp</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> * nameserver - sara il nameserver da cui prelevare le informazioni di zona</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> * zona_int - è il nome della zona di cui voglio prelevare le informazioni (host)</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> * zona_int.txt - conterrà le informazioni da caricare in tinydns, già nel suo formato originale.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Il file avrà un formato di questo tipo:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> #Nome host:IP Host:TTL</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Cpop3.dominio.it:server2.dominio.it.:86400</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Cproxy.dominio.it:server2.dominio.it.:86400</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Cra.dominio.it:server2.dominio.it.:86400</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> +rh.dominio.it:192.168.17.76:86400</div></td>
</tr>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Crh7.dominio.it:rh.dominio.it.:86400</div></td>
</tr>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> +router.dominio.it:212.110.6.169:86400</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> +sco.dominio.it:192.168.17.61:86400</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>* C -> è un Cname</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>* + -> è un host da aggiungere</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>A questo punto per caricare le informazioni:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/usr/local/etc/tinydns/root# cat zona.txt >> data</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> make</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Senza dover riavviare tinydns possiamo risolvere i nuovi host della zona</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/etc/tinydns/root# nslookup rh</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Server: 127.0.0.1 </div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address: 127.0.0.1#53</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Non-authoritative answer:</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Name: rh.dominio.it</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address 192.168.17.76</div></td>
</tr>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Anche per la diagnosi il pacchetto offre delle utility specifiche da utilizzare al posto dei classici dig e nslookup</div></td>
</tr>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>ad esempio:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>* dnsip - restituisce l'IP da un dato nome di dominio</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/tmp# dnsip www.linux.it</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> 62.177.1.107</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>* dnsipq - restituisce l'IP e nome per un nome di dominio</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/tmp# dnsipq www.linux.it</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> www.linux.it 62.177.1.107</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>* dnsname - restituisce il nome per un nome per un dato IP</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/tmp# dnsname 62.177.1.107</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> picard.linux.it</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>* dnsmx - restituisce l'MX (Mail eXchanger) per il dominio richiesto</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/tmp# dnsmx www.netlink.it</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> 10 mail.netlink.it</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Note =</div></td>
<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Note =</div></td>
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<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Note finali =</div></td>
<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Note finali =</div></td>
</tr>
</table>Chrixhttp://www.slacky.eu/wikislack/index.php?title=Djbdns_on_Slackware:_l%27alternativa_al_BIND&diff=3184&oldid=prevChrix: /* Installazione di Dnscache */2006-11-09T20:25:18Z<p><span dir="auto"><span class="autocomment">Installazione di Dnscache</span></span></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black;">← Versione meno recente</td>
<td colspan='2' style="background-color: white; color:black;">Versione delle 20:25, 9 nov 2006</td>
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<td colspan="2" class="diff-lineno">Riga 88:</td>
<td colspan="2" class="diff-lineno">Riga 88:</td>
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<td style="background: #eee; color:black; font-size: smaller;"></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>= Installazione di Dnscache =</div></td>
<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Installazione di Dnscache =</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Per prima cosa creiamo sul sistema l'utente ed il gruppo con cui girerà il DNS cache server. Questa operazione è </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>importante e viene descritta in maiera dettagliata sull'HOWTO ufficiale</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/service# groupadd dns</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/service# useradd -g dns -s /bin/false -d /dev/null dnscache</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/service# useradd -g dns -s /bin/false -d /dev/null dnslog</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Adesso si può lanciare il dns cache server:</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> dnscache-conf dnscache dnslog /usr/local/etc/dnscache</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Questo crea la dir /usr/local/etc/dnscache in cui vengono depositati tutti i file necessari al funzionamento del cache server.</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/usr/local/etc/dnscache# ls</div></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> env/ log/ run* seed</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Per poter far partire dns cache basta sfruttare daemontolls creando il link simbolico nella directory /service</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> ln -s /usr/local/etc/dnscache /service</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>A questo punto possiamo provare una risoluzione dal nostro sistema</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
</tr>
<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/usr/local/etc/dnscache/log/main# dig www.linux.it localhost</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> ; <<>> DiG 9.2.1 <<>> www.linux.it localhost</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> ;; QUESTION SECTION:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> ;www.linux.it. IN A</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> ;; ANSWER SECTION:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> www.linux.it 85381 IN CANME picard.linux.it</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> picard.linux.it 85381 IN A 62.177.1.107</div></td>
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<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>oppure</div></td>
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<td colspan="2"> </td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/usr/local/etc/dnscache/log/main# nslookup www.linux.it localhost</div></td>
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<td colspan="2"> </td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> Server: localhost</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> Address: 127.0.0.1#53</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Non-authoritative answer:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> Name: www.linux.com</div></td>
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<td colspan="2"> </td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> Address 66.35.250.170</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Il nostro dns cache server funziona regolarmente per la risoluzione dei nomi esterni e può essere impostato </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>nel file resolv.conf del nostro host locale. In questo modo comincerà a funzionare come dns cache server vero e proprio.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>I log delle richieste dns possono essere analizzati nella directory '''/usr/local/etc/dnscache/log/main</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Il dns in questo modo è utilizzabile solo dal localhost, ma se volessimo aprire il servizio a host esterni, ad esempio ai client</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>della rete locale, occore effettuare l'operazione di <<external cache for your network>>, </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>come viene definita nella documentazione ufficiale consultabile su:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>http://cr.yp.to/djbdns/run-cache-x.html</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>L'operazione è simile alla precedente, occore solo avere l'indirizzo del network verso cui effettuare l'apertura e l'indirizzo IP</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>del server, per cui avremo:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> dnscache-conf dnscache dnslog /usr/local/etc/dnscache_external 192.168.17.224</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>In questo caso viene anche specificato l'indirizzo IP del dns cache server per la rete locale.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Ovviamente per attivare il servizio occore creare il solito link simbolico:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> ln -s /usr/local/etc/dnscache_external /service</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Per ultimo occore abilitare le richieste dei client della rete per cui occore creare un file</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> touch /usr/local/etc/dnscache_external/root/ip/192.168.17</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Nella directory ip era ovviamente presente solo il file 127.0.0.1 ora invece tutti gli host del network 192.168.17 possono</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>effettuare richieste al server dns e sfruttarne appieno le potenzialità di risolutore.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/usr/local/etc/dnscache/log/main# nslookup www.ibm.com 192.168.17.224</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Server: 192.168.17.224</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address: 192.168.17.224#53</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Non-authoritative answer:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Name: www.ibm.com</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address 129.42.19.99</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Name: www.ibm.com</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address 129.42.16.99</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Name: www.ibm.com</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address 129.42.17.99</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Name: www.ibm.com</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div> Address 129.42.18.99</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Installazione di Tinydns =</div></td>
<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Installazione di Tinydns =</div></td>
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<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Note =</div></td>
<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Note =</div></td>
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</table>Chrixhttp://www.slacky.eu/wikislack/index.php?title=Djbdns_on_Slackware:_l%27alternativa_al_BIND&diff=3183&oldid=prevChrix: /* Introduzione */2006-11-09T20:21:54Z<p><span dir="auto"><span class="autocomment">Introduzione</span></span></p>
<table class='diff diff-contentalign-left'>
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<td colspan='2' style="background-color: white; color:black;">← Versione meno recente</td>
<td colspan='2' style="background-color: white; color:black;">Versione delle 20:21, 9 nov 2006</td>
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<td colspan="2" class="diff-lineno">Riga 1:</td>
<td colspan="2" class="diff-lineno">Riga 1:</td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Networking]]</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:Networking]]</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>= Introduzione =</div></td>
<td class="diff-marker"> </td>
<td style="background: #eee; color:black; font-size: smaller;"><div>= Introduzione =</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Mi è capitato di dover utilizzare su di sistema con distribuzione 9.0 Djbdns, programma alter alternativo al BIND</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>scritto dal noto Daniel J. Bernstein. Mi sono un pò documentato e ho inizialmente pensato che gestire questo programma </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>come dns server fosse complesso ( i DNS in genere lo sono, almeno per me!).</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>In realtà la complessità di questo programma è dovuta alla poca documentazione e alla sua scarsa diffusione, </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>ma in realtà il suo funzionamento è abbastanza semplice specie per chi ha dimestichezza con i programmi del noto </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Daniel J. Bernstein, come Qmail e daemontools ad esempio.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>E' vero, rispetto al Bind manca di molte features, e la sua licenza non è GPL (un limite non da poco), ma chi volesse </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>utilizzarlo potrebbe puntare su di un aspetto non secondario, la sicurezza. Sul sito ufficiale trovate una pagina </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>"The djbdns security guarantee" dove DJB offre in maniera esplicita 500$ a chi gli segnala dei bugs di sicurezza del programma,</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>citto testualmente:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>http://cr.yp.to/djbdns/guarantee.html</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>"I offer $500 to the first person to publicly report a verifiable security hole in the latest version of djbdns."</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Questo sembra essere un buon motivo, anche se in realtà credo che molto dipenda dalle abitudini e dalle necessità di chi</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>attiva il servizio, il quale sceglie il programma che meglio conosce o che meglio si adatta alla situazione che deve affrontare.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>In realtà alla fine della configurazione, mi sono accorto che questo programma è abbastanza semplice </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>(almeno per un uso standard) e molto leggero per il sistema, inoltre abbinandolo a daemontools abbiamo la sicurezza che in </div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>caso di caduta, il servizio venga rilanciato.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Un pò al pari di Qmail, altro prodotto famoso di DJB, djbdns si caratterizza per un'archetettura strutturale completamente</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>diversa al BIND, che con un solo demone e alcuni file di configurazione fa tutto. Qui invece, come per lo stesso Qmail,</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>abbiamo diversi programmi, ognuno per una funzione specifica.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Prima di iniziare mi sono letto l'HOWTO pubblicato da Luca Morettoni</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>http://morettoni.net/docs/djbdns.html</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>indispensabile per capèirne il funzionamento, da cui ho tratto alcuni spunti per scrivere questo breve documento.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Il mio interesse era semplificare al minimo i passaggi e quindi la documentazione necessaria per arrivare a raggiungere</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>il mio obbiettivo, ovvero quello di impostare un resolver per una rete locale che fosse anche autoritativo su di un dominio</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>interno (zona). Autoritativo per una zona, come sappiamo, significa essere il responsabile della risoluzione finale degli host</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>per quel dominio.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Quindi il compito è duplice il primo forse più semplice del secondo, prevede un pò più di conoscenze teoriche sull'utilizzo dei DNS.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Per far funzionare il tutto nella maniera più coretta, le risorse necessarie sono rappresentate da due pacchetti:</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>'''djbdns''' e '''daemontools''' reperibili su</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>http://cr.yp.to/djbdns.html</div></td>
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<tr>
<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>http://cr.yp.to/daemontools.html</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>Daemontoools è necessario per l'avvio e la gestione del demone, consente di monitorarlo e di averlo sempre attivo.</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>L'uso di daemontools è già descritto in questo breve documento che trovate su</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"><div>http://www.sistemistiindipendenti.org/modules/news/article.php?storyid=47</div></td>
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<td colspan="2"> </td>
<td class="diff-marker">+</td>
<td style="background: #cfc; color:black; font-size: smaller;"></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>== Installare daemontools ==</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>== Installare daemontools ==</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>L'istallazione di daemontools è semplice dopo aver scompattato il pacchetto basta eseguire</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/usr/src/admin/daemontools-0.76# ./package/install</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>In pratica daemontools fa partire in modalità "respawn" dall'inttab il programma '''svscanboot''' (per tutti i run level), </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>il quale a sua volta esegue e controlla il programma '''svscan'''. Quest'ultimo analizza il contenuto della directory /service,</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>che viene creata anch'essa sul sistema all'atto dell'installazione di daemontools, e grazie al programma supervise potrà</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>controllare i processi che abbiamo deciso di monitorare e li rieseguirà nel caso in cui questi non dovessero più essere in esecuzione.</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Ovviamente il fatto di utilizzare l'inittab è legato al fatto che '''init''' il padre di tutti i processi, riavvia in automatico tutti i processi</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>che sono sotto il suo diretto controllo</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> SV:123456:respawn:/command/svscanboot</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Questo programma controlla ogni 5 secondi le directory (link simbolici alle directory radice dei programmi da monitorare)</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>contenute in /service che contengono, a loro volta, i file di configurazione per eseguire i vari servizi.</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Appena svscan trova una nuova directory e quindi un nuovo servizio da gestire, '''svscan''' lancia un nuovo processo,</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>supervice. Ogni demone supervice esegue il servizio cui è associato e lo fa ripartire nel caos in cui questo terminasse </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>in modo imprevisto.</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>== Installare Djbdns ==</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>== Installare Djbdns ==</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>L'installazione di djbdns non è complessa, ma al pari della sua configurazione, molto diversa dal bind.</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> cd /usr/src</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> tar zxvf djbdns-1.05.tar.gz</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> make - compila</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> make setup check - installa</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Gli eseguibili vengono installati in /usr/local/bin</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> root@box:/service# which tinydns</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> /usrlocal/bin/tinydns</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div> tinydns tinydns-conf tinydns-data tinydns-edit tinydns-get</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>L'uso del servizio si basa sostanzialmente su due di questi eseguibili:</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* dnscache: è un DNS cache server che consente la risoluzione di domini esterni effettuandone la cache sul sistema</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>* tinydns: è il DNS vero e proprio con cui poter gestire le zone di un dominio.</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>Il nostro obbiettivo preveda come prima cosa l'installazione di un resolver (dns cache server) in grado di fornire il servizio </div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>per i client della rete locale. Per prima cosa abbiamo installato e configurato dnscache, il programma che nel pacchetto</div></td>
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<td style="background: #cfc; color:black; font-size: smaller;"><div>consente di abilitare questo servizio</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>= Installazione di Dnscache =</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>= Installazione di Dnscache =</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>= Installazione di Tinydns =</div></td>
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<td style="background: #eee; color:black; font-size: smaller;"><div>= Installazione di Tinydns =</div></td>
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</table>Chrixhttp://www.slacky.eu/wikislack/index.php?title=Djbdns_on_Slackware:_l%27alternativa_al_BIND&diff=3182&oldid=prevChrix il 20:18, 9 nov 20062006-11-09T20:18:31Z<p></p>
<p><b>Nuova pagina</b></p><div>[[Category:Networking]]<br />
= Introduzione =<br />
== Installare daemontools ==<br />
== Installare Djbdns ==<br />
= Installazione di Dnscache =<br />
= Installazione di Tinydns =<br />
= Note =<br />
= Note finali =</div>Chrix