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

sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

Install `docker-compose`

From: https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-compose-on-ubuntu-20-04

sudo apt-get remove docker-compose
sudo curl -L "https://github.com/docker/compose/releases/download/1.29.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose

Usage

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

Generally the idea of docker-compose command is simple:

First you create a folder for your service, e.g. home-assistant
Then you then create a docker-compose.yml file, which describes the service containers
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.

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