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Traefik installs with Docker Compose by creating a working directory, an acme.json file with 600 permissions for certificates, and a traefik.yml with the Docker provider enabled. The container starts with docker-compose up -d, discovers services through labels, and handles TLS via Let's Encrypt with no extra manual steps.
Docker Compose is Docker's official tool for defining and running multi-container applications with a YAML file: one command spins up every service, network, and volume it describes. On Ubuntu 20.04 it is installed by downloading the standalone binary from GitHub, though Docker recommends moving to the v2 CLI plugin, since v1 is no longer maintained.
To install Docker on Ubuntu 20.04, add Docker's own repository (not Ubuntu's, which tends to lag behind), import its GPG key, install the docker-ce package, and add your user to the docker group so you can run containers without sudo. Running docker run hello-world at the end confirms the daemon works.
