Most of the times you will not encounter any issues when installing Docker. However, unexpected failures might occur. Therefore, it is necessary to discuss the prominent troubleshooting techniques and tips. Let's begin by discussing troubleshooting know-how in this section. The first tip is that Docker's running status should be checked using the following command:

$ sudo service docker status  

If the Docker service is up-and-running, the Active column (the third from the top) will list the status of the Docker service as active (running), as shown next:

However, if the Active column shows inactive or maintenance as the status, your Docker service is not running. In such cases, restart the Docker service, as shown here:

$ sudo service docker restart  

If you are still experiencing issues with the Docker setup, then you must extract the Docker log, using the journalctl -u docker command, for further investigation.