Can I change the enviroment setting without re building the docker image?

Question

So as I sit and develop my Rails application and I move more settings into the environment section of my docker compose file. I then shut down all containers and rebuild the image. Seems like a lot of work.

Can it be updated without rebuilding the image?

Answer 1

Just change your env variables in your docker-compose file. And docker-compose up -d will updates your variables without rebuild images. Rebuild images is necessary if you change your dockerfile.

Check this How to reload environment variables in docker-compose container with minimum downtime?