Ubuntu focal image - Network configuration directory

Docker Hub
1

Dear team,

I am using Ubuntu ubuntu:focal-20220801 container. I need to add “search xyz.com” to my /etc/resolv.conf.
However, this change doesn’t persist if the docker container is killed and restarted. (dhclient probably overwrites it)

Is there anyway I can make it persistent ?

This is ubuntu 20.04.5 LTS. I can’t find netplan configuration files or /etc/netplan or /etc/network/interface configuration files.

Thanks,

2

Containers will not have their own netplan configuration. Containers are just isolated processes and the resolv.conf is generated for the containers and mounted into the container.

docker container inspect containername --format '{{ .ResolvConfPath }}'

If you get the help of docker run, you will get the parameters with which you can control the network including the DNS search parameter:

docker run --help

docker run --help | grep dns

      --dns list                       Set custom DNS servers
      --dns-option list                Set DNS options
      --dns-search list                Set custom DNS search domains
4

wow, thank you @rimelek I did not think of docker run - dns-search. That would work perfect for me. I’ll try it.