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A worker vanished overnight with nothing in its logs. Show me how you read OOM killer output to explain the death.

SIGKILL writes no stack trace and the application cannot defend itself. The verdict is already sitting in the kernel ring buffer, and reading it precisely is the skill being priced.

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.

SIGKILL writes no stack trace and the application cannot defend itself. The verdict is already sitting in the kernel ring buffer, and reading it precisely is the skill being priced.

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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?Next in this trackCapture a TLS connection in tcpdump. What differs between the TLS 1.2 and 1.3 handshakes, and why does an ops person care?

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