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Today, @henet IPv6 issues caused connections to pile up in blackbox_exporter, which triggered a page storm when it...
...ran out of file descriptors.
I swear this is the failure mode that will haunt me until the end of my days. Every year or so it finds a new daemon to strike.
Back when I was working for Google and doing interviews, guess what my troubleshooting scenario's root cause was? Yup.
I wonder if I’d fail said interview. I probably would.
It wasn't really a pass/fail thing about finding the root cause in time, more like whether their approach to troubleshooting was methodical and worked.
It's like every OS should have a secret stash of emergency file descriptors tucked away
It's just a soft limit on Linux, you can just raise it (without restarting the daemon these days even). But it usually defaults to 1024 or so.
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