Gitlab CI: Solve dial unix /var/run/docker.sock: no such file or directory

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It was my first time to try Gitlab CI with docker runner configuration. The problem occurred when I tried to build an web application. I finally found the solution for it.

The error message was shown below.


I separated the gitlab CI installation with gitlab runner in different server. Let's say server A where gitlab CI is installed and server B where gitlab runner is installed and configured.


I thought the problem was caused because I hadn't installed docker on Server A. I installed docker on that server but the same problem kept occurring.

Then I had an idea to install docker as well in server B and voila it works. This was the solution!