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Docker

Docker

Tips

  • When using alpine as the base image in a Dockerfile, remember you won't be able to use Debian commands like sudo apt-install
  • 'docker-compose up' builds and runs the app, but might need to rebuild if you've made changes to the dockerfile
  • Remember 'Docker' runs in an isolated environment and has no additional apps installed unless specified (like chromium for example).

Common commands

  1. List all containers :

    docker container ls -a
    
  2. List all volumes:

    docker volume ls
    
  3. Clear all unused images, containers, etc

    docker system prune
    
  4. Delete all volumes using:

    docker volume rm $(docker volume ls -q)
    

similar for containers

Dockerfile and docker-compose

Dockerfile specifies the actual image whereas docker-compose will help run multiple docker images using docker-compose up

Alternatively, you can run the docker image directly by using something like docker run --publish 8080:8080 <container-id>

Doing a clean restart for a docker instance

Warning: This will wipe out any existing data inside volumes.

  1. Stop the containers using the following command:

    docker-compose down
    
  2. Delete all containers using the following command:

    docker rm -f $(docker ps -a -q)
    
  3. Delete all volumes using the following command:

    docker volume rm $(docker volume ls -q)
    
  4. Restart the containers using the following command:

    docker-compose up -d
    

Use alpine where possible

Alpine ( https://hub.docker.com/_/alpine ) is a tiny Linux distribution ideal for dockerizing/productionizing your applications. This is great for languages like NodeJS.

However, I've had my own gotcha moment with alpine when trying to run a compiled Rust binary in an Alpine container after multi-stage builds. Sounds good on paper, but there's more to it, you would need some low-level wizardry and expertise to make a typical binary run on Alpine container (it's small for a reason) using, and even if you could get it to run, it wouldn't be worth it as it will be negatively impacting performance. More on this: https://andygrove.io/2020/05/why-musl-extremely-slow/