Paluke
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The thing I'm struggling with the most, is that all docker containers run under Root.
If I run a container for a certain domain, I want it to run under that user.
Without the option of adding it to the docker run argument I have to add it to the dockerfile.
I then cannot upload my freshly crafted image in the plesk UI (which is a bug on it's own) and have to do it through SSH.
I have to do this a lot, because I don't want any public container running with root on my server. This is not secure.
tl;dr
Please add at least an option to specify a userId and usergroup:
Taken from the documentation:
USER
root (id = 0) is the default user within a container. The image developer can create additional users. Those users are accessible by name. When passing a numeric ID, the user does not have to exist in the container.
The developer can set a default user to run the first process with the Dockerfile USER instruction. When starting a container, the operator can override the USER instruction by passing the -u option.
-u="", --user="": Sets the username or UID used and optionally the groupname or GID for the specified command.
The followings examples are all valid:
--user=[ user | user:group | uid | uid:gid | user:gid | uid:group ]
https://docs.docker.com/engine/reference/run/
So if there would be a input field for user / group (or dare I say a dropdown with the available users?) That would be really a good thing to have for security.