I've used this before in the early days of my Linux SysAdmin work, especially in the homelab.
It's pretty solid, but the limited amount of projects and lack of visibility into the CLI it uses on the backend hinder the ability to translate sysadmin work into tangible Linux skills, so I dumped it at home in favor of straight SSH sessions and some TUI stuff.
That said, if I gotta babysit Linux in an Enterprise without something like Centrify? Yeah, Cockpit is a solid, user-friendly abstraction layer, especially for WinFolks.
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Part of the technical assessment I have for hiring new platform engineers involves troubleshooting a service hosted in a headless Linux vm.
Troubleshooting and fluency on the command line are among what I consider core skills. Being able to dig through abstraction layers is not just essential for when things go wrong, they are essential for building infrastructure, and really tells you whether an architecture is fit for purpose.