Docker volume file ownership issues under rootless

[rimelek (Ákos Takács)]

Rootless container uses user namespaces so the id in the host is not the same as the id in the container

[Help Needed] How to mount a directory as a non-root user in a container

I quickly tested it on Linux. It looks like on Linux it is indeed works as rootless Docker. So you need to confiugure the subuid and subgid files and if the lowest userid after the username is 100000, then it is UID 1 inside the container. 100001 is UID 2 and so on. On the host, you have to change the owner of the files and folders to 100100 for example (depends on your subuid setting), because if your user is the owner, that is root inside the container. If any other user which is not in the…