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Docker

Install docker engine and docker compose plugin on Ubuntu 22.04

  1. Set up Docker's apt repository.
# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl gnupg
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

# Add the repository to Apt sources:
echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
$(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
  1. Install the Docker packages.
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
  1. Fix docker permission
sudo usermod -aG docker $USER

You need to reboot to apply the change

  1. Verify that the Docker Engine installation is successful by running the hello-world image.
sudo docker run hello-world

This command downloads a test image and runs it in a container. When the container runs, it prints a confirmation message and exits.

  1. Verify that Docker Compose is installed correctly by checking the version.
docker compose version
# Expected output:
Docker Compose version vN.N.N
# Where vN.N.N is placeholder text standing in for the latest version.

Instructions taken from docker official install guide and compose plugin install guide.

Clean unused docker images and volumes

First you can scan how much disk space docker used with the following command :

docker system df

If you need to make some space on your machine because your docker related files take too much space, you can run the following commands to clean your system :

# Remove all unused containers, networks, images (both dangling and unreferenced)
# https://docs.docker.com/engine/reference/commandline/system_prune/
docker system prune -a
# Remove all unused local volumes. Unused local volumes are those which are not referenced by any containers. By default, it only removes anonymous volumes.
# https://docs.docker.com/engine/reference/commandline/volume_prune/
docker volumes prune -a