我如何重新启动我的网站并将新更改应用到 docker 容器？

Question

I want to restart my docker container to apply new changes made. I dont want to create a new image each time i make changes rather that it will overwrite the old one and then restart the container using the rewritten one.

I have tried stopping the container, then building an image with the same name as the old one. i then write docker -compose up -d . Problem is this creates a new container called like -web

Answer 1

The standard approach is to build a new image, stop the existing server container, and then start a new container based on a new image. If you're using Docker Compose, this can be as little as

docker-compose build
docker-compose up -d

Compare this to running a server in a compiled language like Java or Go. Here you have the exact same workflow: compile your updated sources into a new jar file or binary, stop the existing server, and start a new one. There's not usually a reason to try to preserve the existing process and update it with new code.

In the same way, a container is a (temporary) wrapper around a single (temporary) process. There's no particular reason that you need the same container; in normal operation you should be able to delete and recreate a container without losing anything. In Docker you need to recreate a container fairly routinely to change various startup-time-only options, and also to update the underlying image. If you move on to clustered environments like Kube.netes this becomes even more important: you'll have multiple replicas of a container so they can't have persistent state, and it's possible for a container to be deleted and recreated outside of your immediate control.