Docker - export docker sock - export DOCKER_HOST=unix:///var/run/docker.sock

Quick solution:

[root@localhost]# export DOCKER_HOST=unix:///var/run/docker.sock

Restart docker:

[root@localhost]# service docker restart
Redirecting to /bin/systemctl restart docker.service

Run mvn:

[root@localhost]# mvn clean install -Dmaven.test.skip=true

.....

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 11.117s
[INFO] Finished at: Tue Sep 29 04:06:44 EDT 2020
[INFO] Final Memory: 50M/633M
[INFO] ------------------------------------------------------------------------

Common problems

• Docker + Linux - Maven failed to build the project, spotify docker ProcessingException: java.io.IOException: No such file or directory

See also

• google for: export docker.sock
• dockerd daemon
• Protect the Docker daemon socket