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After scaling workers the app dies with too many open files. How do you raise the limit so it actually sticks?

Everyone knows ulimit -n. The interview question is which process inherits which value, why limits.conf did nothing for your service, and how you size the ceiling honestly.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Everyone knows ulimit -n. The interview question is which process inherits which value, why limits.conf did nothing for your service, and how you size the ceiling honestly.

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UP NEXT ON YOUR JOURNEY

Next in this trackA worker vanished overnight with nothing in its logs. Show me how you read OOM killer output to explain the death.Next in this trackSpin up two isolated network stacks on one box and make them talk. Walk me through namespaces and veth pairs.Next in this trackExplain the conntrack state machine. Which timers retire a connection, and why does the table fill with no leak?

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