Using custom DNS Servers in specific networks or applications configuration is standard and, in some cases, improves performance and security.
The Docker CLI offers the option to set custom DNS servers and also set DNS options. To add a custom DNS server to a Docker container, we add the –dns tag and the server IP address.
In the example below, I’m configuring the container to use Google DNS servers (22.214.171.124).
docker run -it --dns 126.96.36.199 ubuntu /bin/bash