====== Docker - Install Docker ====== ===== Prerequisites ===== **ALERT:** Docker is only compatible with **iptables** and **ip6tables**. * Docker is NOT compatible with **ufw**. * See: https://docs.docker.com/engine/network/packet-filtering-firewalls/ ---- ===== Uninstall old versions ===== for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt remove $pkg; done **NOTE:** Images, containers, volumes, and networks stored in **/var/lib/docker/** are not automatically removed when you uninstall Docker. * To start with a clean installation, to clean up any existing data, read the [[https://docs.docker.com/engine/install/ubuntu/#uninstall-docker-engine|uninstall Docker Engine section]]. To delete all images, containers, and volumes: sudo rm -rf /var/lib/docker sudo rm -rf /var/lib/containerd Remove source list and keyrings sudo rm /etc/apt/sources.list.d/docker.list sudo rm /etc/apt/keyrings/docker.asc **NOTE:** Any edited configuration files will need to be deleted manually. ---- ===== Set up the Docker apt repository ===== # Add Docker's official GPG key: sudo apt update sudo apt install ca-certificates curl sudo install -m 0755 -d /etc/apt/keyrings sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc sudo chmod a+r /etc/apt/keyrings/docker.asc # Add the repository to Apt sources: echo \ "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \ $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \ sudo tee /etc/apt/sources.list.d/docker.list > /dev/null sudo apt update ---- ===== Install the Docker packages ===== sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin **NOTE:** * **docker-ce** - The Docker engine itself. * **docker-ce-cli** - A command line tool that lets you talk to the Docker daemon. * **containerd.io** - A container runtime that manages the container’s lifecycle. * **docker-buildx-plugin** - This extension for Docker enhances the capabilities of building images, mainly focusing on multi-platform builds. * **docker-compose-plugin** - A configuration management plugin that helps manage multi-container Docker applications using a single YAML file. ---- ===== Verify that the installation is successful ===== sudo docker run hello-world returns: Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world e6590344b1a5: Pull complete Digest: sha256:0b6a027b5cf322f09f6706c754e086a232ec1ddba835c8a15c6cb74ef0d43c29 Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID: https://hub.docker.com/ For more examples and ideas, visit: https://docs.docker.com/get-started/ **NOTE:** This downloads a test image and runs it in a container. * When the container runs, it prints a confirmation message and exits. * If the command fails to run, try to restart the docker service, before rerunning this test: sudo systemctl restart docker.service ---- ===== Uninstall Docker Engine ===== sudo apt purge docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin docker-ce-rootless-extras Then, manually remove the following two directories: sudo rm -rf /var/lib/docker sudo rm -rf /var/lib/containerd ---- ===== References ===== https://docs.docker.com/engine/install/ubuntu/ https://docs.docker.com/engine/install/ubuntu/#uninstall-docker-engine https://docs.docker.com/engine/network/packet-filtering-firewalls/