Create setup-docker.md

Author: jAniceto

programming-notes/homeserver/setup-docker.md

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+# Set up Docker and Docker Compose
+
+## Installing Docker
+
+<sub><sup>Reference: [Install Docker Engine on Ubuntu](https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository)</sub></sup>
+
+Set up Docker's `apt` repository.
+
+```bash
+# Add Docker's official GPG key:
+sudo apt-get update
+sudo apt-get 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-get update
+```
+
+Install the Docker packages.
+
+```bash
+sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+```
+
+Verify that the installation is successful by running the hello-world image:
+
+```bash
+sudo docker run hello-world
+```
+
+### Now some optional post-installation steps
+
+<sub><sup>Reference: [Linux post-installation steps for Docker Engine](https://docs.docker.com/engine/install/linux-postinstall/)</sub></sup>
+
+Create the `docker` group and add your user:
+
+```bash
+sudo groupadd docker
+sudo usermod -aG docker $USER
+```
+
+Log out and log back in so that your group membership is re-evaluated. 
+
+```bash
+exit
+ssh username@hostname
+```
+
+## Installing Docker Compose
+
+<sub><sup>Reference: [Overview of installing Docker Compose](https://docs.docker.com/compose/install/)</sub></sup>
+
+Since we already have Docker Engine and Docker CLI installed, we can install the Docker Compose plugin from the command line, by using Docker's repository:
+
+Update the package index, and install the latest version of Docker Compose:
+
+```bash
+sudo apt-get update
+sudo apt-get install docker-compose-plugin
+```
+
+To verify that Docker Compose is installed correctly we can run:
+
+```bash
+docker compose version
+```
+