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--- docker:install_docker [2016/10/14 00:03] – peter
+++ docker:install_docker [2025/07/12 12:32] (current) – [Uninstall Docker Engine] peter
@@ Line 1: / Line 1: @@
 ====== Docker - Install Docker ======
-===== Check the kernel version and the OS architecture =====
+===== Prerequisites =====
-Run **uname -a** to check the version of the currently running Linux kernel:
+<WRAP alert>
+**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/
+</WRAP>
+----
+===== Uninstall old versions =====
 <code bash>
-uname -a
+for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt remove $pkg; done
 </code>
-Check that it's a 64Bit Kernel (x86_64).  Docker won't work without this.
+<WRAP info>
+**NOTE:**  Images, containers, volumes, and networks stored in **/var/lib/docker/** are not automatically removed when you uninstall Docker.
+  * To start with a clean installation, to clean up any existing data, read the [[https://docs.docker.com/engine/install/ubuntu/#uninstall-docker-engine|uninstall Docker Engine section]].
-Check the Ubuntu version.
+</WRAP>
+To delete all images, containers, and volumes:
 <code bash>
-cat /etc/lsb-release
+sudo rm -rf /var/lib/docker
+sudo rm -rf /var/lib/containerd
 </code>
-The command shows that the Ubuntu version is 16.04.
+Remove source list and keyrings
-It is recommended to update Ubuntu before you install new software. Run the following command to fetch the latest updates from the Ubuntu repository and install them.
+<code bash>
+sudo rm /etc/apt/sources.list.d/docker.list
+sudo rm /etc/apt/keyrings/docker.asc
+</code>
-apt-get update
+<WRAP info>
-apt-get upgrade
+**NOTE:**  Any edited configuration files will need to be deleted manually.
+</WRAP>
-Now install docker with the apt command:
+----
+===== Set up the Docker apt repository =====
 <code bash>
-apt-get install -y docker.io
+# Add Docker's official GPG key:
+sudo apt update
+sudo apt install ca-certificates curl
+sudo install -m 0755 -d /etc/apt/keyrings
+sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
+sudo chmod a+r /etc/apt/keyrings/docker.asc
+# Add the repository to Apt sources:
+echo \
+  "deb [arch=$(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
 </code>
-Wait until the installation has been completed, then you can start Docker with the systemctl command:
+----
+===== Install the Docker packages =====
 <code bash>
-systemctl start docker
+sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
 </code>
-Enable docker to run at system boot:
+<WRAP info>
+**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.
+</WRAP>
+----
+===== Verify that the installation is successful =====
 <code bash>
-systemctl enable docker
+sudo docker run hello-world
 </code>
-You might also want to check the docker version:
+returns:
+<code>
+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:
+. The Docker client contacted the Docker daemon.
+. The Docker daemon pulled the "hello-world" image from the Docker Hub.
+    (amd64)
+. The Docker daemon created a new container from that image which runs the
+    executable that produces the output you are currently reading.
+. 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/
+</code>
+<WRAP info>
+**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: <code bash>
+sudo systemctl restart docker.service
+</code>
+</WRAP>
+----
+===== To Uninstall Docker Engine =====
 <code bash>
-docker version
+sudo apt purge docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin docker-ce-rootless-extras
 </code>
-Show the currently installed Docker version.
+Then, manually remove the following two directories:
+<code bash>
+sudo rm -rf /var/lib/docker
+sudo rm -rf /var/lib/containerd
+</code>
+----
+===== References =====
+https://docs.docker.com/engine/install/ubuntu/
+https://docs.docker.com/engine/install/ubuntu/#uninstall-docker-engine
-Now docker is installed in your system.  You can start making a container by downloading a Docker Image from the Docker Registry.
+https://docs.docker.com/engine/network/packet-filtering-firewalls/