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/etc/resolv.conf

/etc/resolv.conf is the resolver configuration file. It's used to access the DNS (domain name service).

The following simple example content specifies the nameserver to be 8.8.8.8:

nameserver 8.8.8.8

At least in Ubuntu, /etc/resolv.conf is not used anymore, unless its »manually« implemented.

In WSL, /etc/resolv.conf is a symbolic link to a file with the same name under /mnt/wsl.

See also