@veronikya said in mongodb replica set:

The host’s local dns resolution is not configured. The problem of the host’s hosts being unable to be resolved in docker has been solved. Surprisingly
Solution:
Edit the /etc/resovel.conf file
Add 127.0.0.53

One immediate issue I can think of here is that editing resolv.conf directly is no longer supported and not recommended (because the changes do not survive a reboot) - unless you install the resolvconf package?