What command can you use to check if Docker is running?

To determine if Docker is running, using the commands "docker info" or "docker version" is effective because both commands will interact with the Docker daemon. If Docker is running, these commands will return detailed information about the Docker installation, including configuration, system status, versions, and more.

The "docker info" command provides comprehensive information about the Docker environment, such as the number of running containers, images available, storage driver in use, and various system-wide information. Meanwhile, "docker version" gives concise metadata regarding the client and server versions of Docker, validating that both components are operational.

In contrast, other commands like "docker check," "docker status," or "docker running" do not exist as valid Docker commands and will not return useful information. Thus, the correct commands to confirm whether Docker is operating are indeed "docker info" and "docker version."