How to set an environment variable in a running docker container

Question

If I have a docker container that I started a while back, what is the best way to set an environment variable in that running container? I set an environment variable initia

Answer 1

You could set an environment variable to a running Docker container by

docker exec -it -e "your environment Key"="your new value" /bin/bash

Verify it using below command

printenv

This will update your key with the new value provided.

Note: This will get reverted back to old on if docker gets restarted.