gitlab kubernernetes integration: configuring the installed runner I connected my existing kubernetes cluster to gitlab using the gitlab integration in myproject/operations/kubernetes on the left tab pane in the gitlab gui.
After having installed helm + gitlab runner from the gitlab GUI applications, the new gitlab runner is visible in the project runners.
What I don't understand from the gitlab documentation is how do you modify  the new runner's configuration. You cannot use the gitlab-runner cli, like for a non-kubernetes runner, because the runner in running in a pod, not on the host machine, right?
I am not sure which part of the runner doc applies to my case. What to use if I wanted to make the runner use another executor or build from another image ? (default image of the pod is ubuntu 16 for me).
If you have already installed and configured a runner installed this way, from the GUI, please tell me how. Thank you.
Gitlab 12.9.2 hosted
Installing kubernetes integration on gitlab
In Admin Area -&gt; Overview -&gt; Runners, the instructions they give are:

Install GitLab Runner
Specify the following URL during the Runner setup: https://&lt;your gitlab hostname&gt;/
Use the following registration token during setup: &lt;insert-token-here&gt;
Start the Runner!

I'm on version 13.13.0 but I don't remember the instructions changing from version 12.x.x.
Project specific runners
As for your question regarding configuration, I'm a little bit confused if you're looking for something beyond those instructions. If you want to set up a runner specific to a project, you can go to a project then navigate to Settings -&gt; CI/CD -&gt; Runners -&gt; Specific Runners. There, there are more instructions on setting up project-specific runners.
Further configuring the runner
EDIT: The executor entirely depends on how the runner itself is installed. If it's installed on a kubernetes cluster, then it must be the kubernetes executor. That will affect your pipeline. I think you can create another one if you install another one with the runner chart. You can also use Helm Tiller.