Tips & Tricks

Clean every unused images, containers, networks & build cache)

docker system prune -a

Delete all containers at once

docker rm -f $(docker ps -aq)

Build image in docker compose

It is possible to build an image directly inside docker compose.

udf:
    build: https://github.com/kipavy/tradingview-udf-binance-node.git
    restart: always
    ports:
      - "9090:443"

Even better, you can specify a branch, example for dev branch:

Keep the .git before the # or this syntax may not work

build: https://github.com/kipavy/tradingview-udf-binance-node.git#dev

You can also specify a custom Dockerfile name using context:

services:
  web:
    build:
      # build context: where to look for Dockerfile, as seen it can also be a distant URL
      context: ./app
      # Custom Dockerfile name, relative to the context directory
      dockerfile: Dockerfile.dev

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Get container start command

You started a container with docker run CLI but you forgot the command you used ? You can kinda get it back with these steps:

1. Get your container ID (you can just take a few char if you want):

docker ps

1. Run this with your ID at the end (lets say b0ca0c234177):

docker run --rm -v /var/run/docker.sock:/var/run/docker.sock:ro assaflavie/runlike b0ca0c234177

If you think you'll use it frequently you can add an alias to your ~/.bashrc or ~/.zshrc:

alias runlike="docker run --rm -v /var/run/docker.sock:/var/run/docker.sock:ro assaflavie/runlike"

After restarting your terminal, you can use it like this:

runlike rclone  # container name
runlike c64  # container ID

Run GUI apps in docker in WSL2 using WSLg

docker run -it --rm \
  -v $(pwd):/app \
  -e DISPLAY=:0 \
  -v /tmp/.X11-unix:/tmp/.X11-unix \
  -e XDG_RUNTIME_DIR=/mnt/wslg/runtime-dir \
  -e PULSE_SERVER=/mnt/wslg/PulseServer \
  image

If fonts are missing in your app, it may be necessary to install fonts, on alpine I needed to run this for firefox to work properly:

apk add font-noto font-noto-cjk font-noto-emoji

Get container IP from service name

docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $(docker compose ps -q <service_name>)

Get container IP from id or name

docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' <container_name_or_id>

Get volume mount folder

docker volume inspect -f '{{ .Mountpoint }}' <volume_name>