Use Case pidof dockerd to make sure Docker is actually shut down. You will see this message when running dockerd: failed to start daemon: pid file found, ensure docker is not running or delete /var/run/docker.pid This could get you stuck in a restart loop if the file is in fact orphaned from a previous run. The daemon will refuse to restart when a PID file is present. It may be more reliable than searching docker.pid - if the demon crashes, docker.pid could be left behind once the process is complete. There is an active Docker daemon on your machine if top corresponds to a dockerd to treat. This accepts a process name and returns the first matching ID: pidof dockerd # process id = 1000 # view information with top top -p `pidof dockerd` You can also get the process ID with the pidoforder. Reading the file gives you the ID which you can use with tools like top for more information about the Docker process: cat /var/run/docker.pid # process id = 1000 top -p 1000 You can use this technique to create programming scripts that check if the daemon is alive. When this file exists, Docker should be running and ready for CLI connections. The daemon writes its process ID to /var/run/docker.pid at each start. Inspection of process detailsĪnother way to find a running Docker daemon is to inspect its process ID file. Restart your host machine or restart the Docker service with systemctl restart docker can also help alleviate transient problems. When no obvious resolution is available, manually start the daemon in debug mode to get more information about its startup routine. You should review the service startup logs displayed later in the systemctl the output of the command because they usually contain hints that allow you to determine what went wrong. If you see a status of failed in red, the daemon could not start due to an error. The status should change to active (running) after starting the daemon. Try to bring him running sudo systemctl start docker. If you see active (running) in green, the Docker daemon is running and your containers should be operational.Īn active state of inactive indicates that the service has stopped. sudo systemctl status dockerĬheck what is displayed under “Active”. This covers the majority of popular operating systems, including Debian, Ubuntu, CentOS, and Red Hat. You can check the status of Docker with systemctl on distributions that use Systemd for service management.
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