#linux #docker #homelab

Normal Docker Installation

1. Download installer script:
   curl -fsSL get.docker.com -o get-docker.sh
2. Execute the script:
   sh get-docker.sh
3. Add user to docker group:
   sudo groupadd docker
   sudo gpasswd -a <user-name> docker
4. Reboot

To update Docker rerun the get-docker.sh script.

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Enabling Docker in Rootless Mode

To run Docker in rootless mode, follow the steps outlined below:

1. Install dbus-user-session, uidmap packages
2. If accessing via SSH, install systemd-container to switch to the local user:

   sudo apt install systemd-container
   sudo machinectl shell TheUser@<hostname>

3. Create a non-root user and add it to the docker group User-Management (sudo usermod -aG docker)
4. Download and execute rootless docker:

   curl -fsSL https://get.docker.com/rootless | sh

5. Follow the instructions of script
6. Next, in order to allow you to publish containers using ports <1024, you need to add the following line to /etc/sysctl.conf

   # Change the port number to what ever port should be the lowest port bindable for non root users.
   net.ipv4.ip_unprivileged_port_start=80

   Save the file and then reload the sysctl settings: sudo sysctl -p

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Uninstall Docker

1. Remove packages:
      sudo apt-get purge docker-ce docker-ce-cli containerd.io
2. Remove all Docker data (images, containers, volumes):
      sudo rm -rf /var/lib/docker

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General

To enable Docker to start automatically on login and to keep it running after logout:

systemctl --user start docker
systemctl --user enable docker

# Allow for docker to run in the background
sudo loginctl enable-linger $(whoami)