Install Docker and Portainer

March 22, 2024 Guide

1. sudo apt update

This command updates the list of available packages and their versions, but it does not install or upgrade any packages. sudo elevates the command to run with administrative privileges (as the root user), which is necessary for managing system-wide packages. apt is the package management tool used by Debian-based Linux distributions, like Ubuntu, to handle the installation, upgrade, and removal of software.

2. sudo apt install docker.io -y

This command installs the Docker package from your Linux distribution's repository. The -y flag automatically answers 'yes' to prompts during the installation process, such as confirming the disk space usage. Note that on some distributions, the Docker package might be named differently, such as docker-ce (Docker Community Edition). You should check the correct package name for your distribution.

3. docker volume create portainer_volume

This command creates a new Docker volume named portainer_volume. Docker volumes are used for persisting data generated by and used by Docker containers. In this context, it's likely intended to store Portainer's data, making it persistent across container restarts and removals.

4. docker run -d -p 9443:9443 -p 8000:8000 --name portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_volume:/data portainer/portainer-ce:latest

This command runs a new container for Portainer, a popular Docker management UI, with several specified options:

• -d runs the container in detached mode.
• -p 9443:9443 and -p 8000:8000 map ports from the host to the container, allowing access to Portainer's web interface (on port 9443) and its Edge agent (on port 8000).
• --name portainer assigns the name "portainer" to the container for easier reference.
• --restart=always ensures the container automatically restarts if it crashes or if the host is rebooted.
• -v /var/run/docker.sock:/var/run/docker.sock mounts the Docker socket into the container, allowing Portainer to communicate with the Docker daemon and manage containers.
• -v portainer_volume:/data mounts the previously created portainer_volume to /data inside the container, where Portainer stores its data.
• portainer/portainer-ce:latest specifies the image to use for the container, in this case, the latest Community Edition of Portainer.

Each of these commands plays a specific role in setting up and managing a Docker environment, including running services like Portainer for container management.

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