In the previous chapter, we installed a GitLab Runner with the shell executor. In this chapter, we will take a closer look at containerized GitLab Runners. You can run a GitLab Runner in a container in multiple ways:
- With the Shell executor running in a custom-built Docker container: This is not recommended because you are responsible for building and supporting this custom container afterward. On the other hand, if you want to tightly control the components inside the container and the behavior of them, then it might be a good way to containerize the Runner. Scaling this solution also requires more work from your side because the Runner itself only knows how to run jobs and connect to GitLab. You will collect state (files in /tmp or elsewhere) in your containers if they don't restart after a job, so be prepared to handle that...
