I just noticed that the docker install for rootless uses port 2222 internally whilst the normal latest uses port 22; Its not obvious from any documentation other than the compose.yaml files, so what is the reason?
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The reason is quite simple. The rootful variant uses an S6 overlay service in the container, which starts a classic OpenSSH service in addition to the actual Gitea service. This runs as usual on port 22.
The rootless variant, on the other hand, uses the built-in SSH service in Gitea itself. Since the rootless variant does not run as root, it can only use ports > 1024. Accordingly, it runs on port 2222 by default.
Thanks that helps me understand something, although it doesn’t completely answer it. I have now switched over to rootful version and have it running, although it seems to be very sensitive to which directories on my synology NAS I tell it to use. Its own dedicated share fails, but inside my docker share it its own directory it works fine.