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switched from portainer to arcane recently. much easier on the eyes and the ability to save compose projects without deploying them yet is exactly what i was looking for. one thing is weird and i should prolly make an issue for it: no horizontal scroll or word wrap function in the compose editor, so for those compose files with extensive comments like npmplus you'll have to have open in a text editor or webpage to read to the end of lines.
man, arcane looks amazing, I ended up deciding off it though as their pull requests look like they use copilot for a lot of code for new features. Not that I personally have an issue with this but, I've seen enough issues where copilot or various AI agents add security vulnerabilities by mistake and they aren't caught, so I would rather stray away from those types of projects at least until that issue becomes less common/frequent.
For something as detrimental as a management console to a program that runs as root on most systems, and would provide access to potentially high secure locations, I would not want such a program having security vulnerabilities.
Does it have to run as root? It's common to run Docker in rootless mode in production environments.
while docker does have a non-root installer, the default installer for docker is docker as root, containers as non-root, but since in order to manage docker as a whole it would need access to the socket, if docker has root the container by extension has root.
Even so, if docker was installed in a root-less environment then a compromised manager container would still compromise everything on that docker system, as a core requirement for these types of containers are access to the docker socket which still isn't great but is still better than full root access.
To answer the question: No it doesn't require it to function, but the default configuration is root, and even in rootless environment a compromise of the management container that is meant to control other containers will result in full compromise of the docker environment.