docker daemon not running code example

Example 1: Start the Docker daemon

sudo systemctl start docker
sudo service docker start

Example 2: docker daemon is not running

Net stop com.docker.service
Net start com.docker.service

Example 3: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

sudo dockerd

Example 4: this error may indicate that the docker daemon is not running

Open powershell as admin and use : & 'C:\Program Files\Docker\Docker\DockerCli.exe' -SwitchDaemon

Example 5: htcondor daemons not running

If HTCondor daemons are currently running, but need to be killed and 
newly invoked, the condor_restart tool does this. This would be the 
case for a new value of a configuration variable for which using 
condor_reconfig is inadequate.

To restart all daemons on all machines in the pool,

  condor_restart -all
To restart all daemons on a single machine in the pool,

  condor_restart <hostname>
where <hostname> is replaced by the host name of the machine to be restarted.