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+[[Use YAML anchors to reuse scripts in Gitlab CI]]
+
+**To use docker-in-docker** we need to specify a tag, a service and a specific image:
+```
+  tags:
+    - docker-in-docker
+  image: harbor.one.com/docker-hub/library/docker:latest
+  services:
+    - docker:dind
+```
+
+> It's not possible with a custom CI image afaik, so everything needs to run inside a docker container.
+