When Docker is first installed, it is not running. You must start the server with a command such as the following:

    # service docker start

The Docker command has many subcommands that provide functionality. These commands will find a Docker container and download and run it. Here's a bit about the subcommands:

• # docker search: This searches Docker archives for containers with names that match a key
• # docker pull: This pulls the named container to your system
• # docker run: This runs an application in a container
• # docker ps: This lists the running Docker containers
• # docker attach: This attaches to a running container
• # docker stop: This stops a container
• # docker rm: This removes a container

The default Docker installation requires that the docker command be run either as a root or using sudo.

Each of these commands have a man page. This page is named by combining the command and subcommand with a dash. To view the docker search man page, use man docker-search.

The next recipe demonstrates how to download a Docker container and run it.