https://pclosusers.com/wiki/index.php?action=history&feed=atom&title=DNS_CachingDNS Caching - Revision history2026-05-25T19:19:59ZRevision history for this page on the wikiMediaWiki 1.39.13https://pclosusers.com/wiki/index.php?title=DNS_Caching&diff=640&oldid=prevDwmoar: Created page with "This page will explain how to install DNS caching to improve DNS lookup performance. == Install required packages: == Open [https://wiki.pclosusers.com/index.php/Synaptic_So..."2024-10-19T02:59:36Z<p>Created page with "This page will explain how to install DNS caching to improve DNS lookup performance. == Install required packages: == Open [https://wiki.pclosusers.com/index.php/Synaptic_So..."</p>
<p><b>New page</b></p><div>This page will explain how to install DNS caching to improve DNS lookup performance.<br />
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== Install required packages: ==<br />
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Open [https://wiki.pclosusers.com/index.php/Synaptic_Software_Packager Synaptic package manager] and search for bind. Install below 2 packages.<br />
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''bind-utils - for dig/nslookup''<br />
''bind - for DNS caching''<br />
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== Change hostname and domain: ==<br />
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We will set the computername to compname and the domain to somedomain. You can choose any name of your choice for these.<br />
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In PCLinuxOS Control Center > Network & Internet > Host definitions add below entries<br />
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''127.0.0.1 compname.somedomain 127.0.0.1 localhost''<br />
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You can also add above entries directly to /etc/hosts file. You need to be a root user to edit this file.<br />
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Edit file '''/etc/sysconfig/network''' as '''<font color="red">root</font>''' user and modify below line.<br />
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''HOSTNAME=compname.somedomain''<br />
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== Start local DNS service: ==<br />
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In PCLinuxOS Control Center > System > "Manage system services..."<br />
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Go to named service line, select checkbox next to "'''on boot'''", click '''Start button'''<br />
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== Add the new local DNS to network settings: ==<br />
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Add "nameserver 127.0.0.1" without any empty lines to /etc/resolvconf/resolv.conf.d/base<br />
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Add below lines to without any empty lines '''/etc/resolvconf/resolv.conf.d/tail'''<br />
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''nameserver 208.67.222.222 nameserver 208.67.220.220''<br />
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Open a terminal window and change user to '''<font color="red">root</font>''' by using '''su''' command. Restart network by executing below command<br />
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''service network resetart''<br />
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Below is a sample output for the command. Output will vary depending on your network setup.<br />
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[root@icsserver andrzejl]# service network restart<br />
Shutting down interface eth1: [ OK ]<br />
Shutting down interface ppp0: [ OK ]<br />
Shutting down loopback interface: [ OK ]<br />
Disabling IPv4 packet forwarding: [ OK ]<br />
Bringing up loopback interface: [ OK ]<br />
Enabling IPv4 packet forwarding [ OK ]<br />
Configuring wireless regulatory domain [ OK ]<br />
Bringing up interface eth1: [ OK ]<br />
Bringing up interface ppp0: [ OK ]<br />
[root@icsserver andrzejl]#<br />
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== Verification of the setup: ==<br />
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Open a terminal window, execute below commands and look for similar output.<br />
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[root@icsserver andrzejl]# cat /etc/resolv.conf<br />
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(<br />
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN<br />
nameserver 127.0.0.1<br />
nameserver 208.67.222.222<br />
nameserver 208.67.220.220<br />
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Below command does a DNS lookup. The first lookup takes 265 msec. The second lookup only takes 1 msec.<br />
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[andrzejl@icsserver ~]$ dig pclinuxos.com<br />
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; <<>> DiG 9.8.1-P1 <<>> pclinuxos.com<br />
;; global options: +cmd<br />
;; Got answer:<br />
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10203<br />
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 0<br />
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...<br />
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;; Query time: 265 msec<br />
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...<br />
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;; SERVER: 127.0.0.1#53(127.0.0.1)<br />
;; WHEN: Sat Dec 10 21:41:28 2011<br />
;; MSG SIZE rcvd: 131<br />
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[andrzejl@icsserver ~]$ dig pclinuxos.com<br />
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; <<>> DiG 9.8.1-P1 <<>> pclinuxos.com<br />
;; global options: +cmd<br />
;; Got answer:<br />
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8272<br />
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 2<br />
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...<br />
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;; Query time: 1 msec<br />
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...<br />
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;; SERVER: 127.0.0.1#53(127.0.0.1)<br />
;; WHEN: Sat Dec 10 21:41:29 2011<br />
;; MSG SIZE rcvd: 163<br />
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[[Category:HowTo]]</div>Dwmoar