Question

12

How do I activate a local caching nameserver?

rated 0 times [ 12] [ 0] / answers: 1 / hits: 7579 / 3 Years ago, thu, july 15, 2021, 3:57:59

I want to have strong DNS cache server on my local host (server). So I need to change name server to my localhost.

How can I change it?
byt this config it seems I must don't change it via editor so how can I change it?

root@asqar# cat /etc/resolv.conf 

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 4.2.2.4

search asqar.net

I'm using bind9 how can I set the DNS cache, any configure ?

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answered 3 Years ago ciousuntru · Accepted Answer

If you want a DNS cache on your local machine, use dnsmasq, not BIND.

Unless you really need a local iterative nameserver, de-install BIND.

sudo apt-get purge bind9

Now for dnsmasq. There are two ways of using dnsmasq.

1: If you are using NetworkManager to manage networking then you already have the dnsmasq-base package installed; you just have to enable the NetworkManager-controlled dnsmasq instance by editing NetworkManager.conf

sudo gedit /etc/NetworkManager/NetworkManager.conf

and ensuring that the line

dns=dnsmasq

is present. Next enable caching in this dnsmasq instance. Create a new configuration file called, e.g., local

sudo gedit /etc/NetworkManager/dnsmasq.d/local

and add the single line

cache-size=150

to change the default cache size from zero. Then restart network-manager

sudo restart network-manager

which will also start or restart the NetworkManager-controlled dnsmasq instance using the new nonzero cache size.

This only works in Ubuntu 12.10 or later. In Ubuntu 12.04 the NetworkManager-controlled dnsmasq configuration cannot be customized and the cache size is zero.

2: The other way of using dnsmasq is to run it as a server. To do this, install the dnsmasq package and configure it by editing /etc/dnsmasq.conf and setting cache-size to a value greater than zero.

In Ubuntu 12.10 the dnsmasq server will forward queries to external nameservers if the NetworkManager-controlled dnsmasq instance is disabled and will forward queries to the NetworkManager-controlled dnsmasq instance at the address 127.0.1.1 if the NetworkManager-controlled dnsmasq instance is enabled.

In Ubuntu 12.04 the same thing can be achieved but some additional manual configuration steps are required because in Ubuntu 12.04 the NetworkManager-controlled dnsmasq instance listens at 127.0.0.1 which conflicts with dnsmasq server in its default configuration.