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Get started with docker & docker-compose

Installation instructions for Ubuntu Linux from: https://docs.docker.com/engine/install/ubuntu/

Uninstall old versions

sudo apt-get remove docker docker-engine docker.io containerd runc

Install Docker & docker-compose-plugin (on Ubuntu)

sudo apt update
sudo apt install ca-certificates curl gnupg lsb-release
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io docker-compose-plugin

Usage

Full docs are here: https://docs.docker.com/compose/reference/overview/

Generally the idea of docker compose command is simple:

  1. First you create a folder for your service, e.g. home-assistant
  2. Then you then create a docker-compose.yml file, which describes the service containers
  3. You run docker compose up -d and you're done!

Here are the most frequently used commands:

Start a container

-d starts in a detached mode - which basically mean that it runs it in the background (so you can do other stuff, instead of looking at the logs).

docker compose up -d

Stop a container

There are 2 options:

docker compose stop
docker compose down

First one (stop) onlu stops the containers, whereas the latter (down) does some more cleaning (removes the containers, networks, volumes), so I generally recommend down if you're tinkering.

Update a container to use the latest published image

docker compose pull && docker compose up -d

This pulls the latest images as defined in the local docker-compose.yml and recreates the containers.