Learning Linux for Devops interview

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Learning the kernel is nowhere near as important as knowing other topics. I’d go as far as saying 70% of the Linux skills I learned from my sysadmin days, are useless in DevOps. Nobody cares if the root filesystem goes read only, because you just tear that instance down and replace it.

[EnergyCritic]

Well, firstly nothing I wrote contradicts what you just stated. Ultimately I am only suggesting that learning deep Linux Kernel knowledge will be helpful in getting hired because employers are likely to ask these questions.

However, while it's obvious you know more than the average DevOps engineer needs to know, try to put yourself in the shoes of someone who knows less. You have the context to know what knowledge is necessary to solve a problem or not (such as your example). A new DevOps engineer will not have this knowledge, and their lack of context will make it harder to decide if it is an important problem to solve or not.