resolv.conf is the configuration file for DNS resolvers for all Linux distributions, including Debian, Mint, Ubuntu, RedHat, CentOS, etc. Usually we change the DNS resolvers list by editing resolv.conf. However, depends on your dhcp client configuration, resolv.conf may be rewrite after reboot. Without deep Linux experience, setting customs DNS servers on Linux maybe time consuming. But one thing we can do is make /etc/resolv.conf immutable to other program after you changed it. This will be the easier setup with no side effects on system.
Change the DNS server
Below example we will set DNS resolver to 1.1.1.1. (1.1.1.1 is a privacy-first consumer DNS service provided by Cloudflare.)
1 | sudo echo 'nameserver 1.1.1.1' > /etc/resolv.conf |
Run the chattr +i command to sets the immutable filesystem attribute on resolv.conf, so it can’t be modified any anyone else.
1 | sudo chattr +i /etc/resolv.conf |
Reboot your system and test if your change to DNS server succeed. You can test it via DNS leak test. If you want to make change to resolv.conf again, you need to remove the attribute.
1 | sudo chattr -i /etc/resolv.conf |
Some free public DNS server list:
Google Public DNS 8.8.8.8 / 2001:4860:4860::8888 8.8.4.4 / 2001:4860:4860::8844
OpenDNS 208.67.222.222 / 2620:0:ccc::2 208.67.220.220 / 2620:0:ccd::2
Comodo Secure DNS 8.26.56.26 8.20.247.20
Norton ConnectSafe 199.85.126.10 199.85.127.10
Level 3: 209.244.0.3 209.244.0.4
Verisign Public DNS 64.6.64.6 64.6.65.6
DNS.WATCH 84.200.69.80 84.200.70.40 2001:1608:10:25::1c04:b12f 2001:1608:10:25::9249:d69b
AdGuard Default 176.103.130.130 176.103.130.131 2a00:5a60::ad1:0ff 2a00:5a60::ad2:0ff
Family protection 176.103.130.132 176.103.130.134 2a00:5a60::bad1:0ff 2a00:5a60::bad2:0ff
Quad9 9.9.9.9 9.9.9.10 2620:fe::fe 2620:fe::10
Cloudflare DNS Resolver 1.1.1.1 1.0.0.1 2606:4700:4700::1111 2606:4700:4700::1001
CleanBrowsing Family Filter 185.228.168.168 185.228.168.169 2a0d:2a00:1:: 2a0d:2a00:2::
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