Ask HN: What are the essential Linux sysadmin skills

Hi HN,

Just to give a you a little bit of background, I'm a software developer. I do mostly Python, Node.js and a little bit of Golang.

At work and in my personal projects, I was exposed to DevOps and Linux admin, which I do, but lightly. (I manage my own VPS', I've played with Ansible, I can create users and all ...)

I'm currently looking to expand my set of skills to Linux System Administration and I would like to know the essential abilities a sysadmin should be able to demonstrate to be taken seriously.

(I don't necessarly want to leave software development but If I ever get tired of it, I can totally see myself hacking away in Linux and get paid to do it)

Cheers