## List Docker CLI commands

docker
docker container --help

## Display Docker version and info

docker --version
docker version
docker info

## Execute Docker image

docker run hello-world

## List Docker images

docker image ls

## List Docker containers (running, all, all in quiet mode)

docker container ls
docker container ls --all
docker container ls -aq

First, update your existing list of packages:

  sudo apt update

Next, install a few prerequisite packages which let apt use packages over HTTPS:

  sudo apt install apt-transport-https ca-certificates curl software-properties-common

Then add the GPG key for the official Docker repository to your system:

  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Add the Docker repository to APT sources:

  sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"

Next, update the package database with the Docker packages from the newly added repo:

  sudo apt update

Make sure you are about to install from the Docker repo instead of the default Ubuntu repo:

  apt-cache policy docker-ce

You'll see output like this, although the version number for Docker may be different: Output of apt-cache policy docker-ce

docker-ce:

Installed: (none)
Candidate: 18.03.1~ce~3-0~ubuntu
Version table:
   18.03.1~ce~3-0~ubuntu 500
      500 https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages

Notice that docker-ce is not installed, but the candidate for installation is from the Docker repository for Ubuntu 18.04 (bionic).

Finally, install Docker:

  sudo apt install docker-ce

By default, the docker command can only be run the root user or by a user in the docker group, which is automatically created during Docker's installation process. If you attempt to run the docker command without prefixing it with sudo or without being in the docker group, you'll get an output like this:

Output docker: Cannot connect to the Docker daemon. Is the docker daemon running on this host?. See 'docker run –help'.

If you want to avoid typing sudo whenever you run the docker command, add your username to the docker group:

  sudo usermod -aG docker ${USER}

To apply the new group membership, log out of the server and back in.

docker search mariadb
docker pull mariadb
docker run --name dbserver -e MYSQL_ROOT_PASSWORD=mypass -d mariadb

Pour voir si elle est démarrée

docker ps

Pour s'y connecter et changer la config

docker exec -it dbserver bash

Pour arréter le serveur

docker stop dbserver

Pour redémarrer le serveur

docker start dbserver
docker restart dbserver