Efficient Ops
Oct 27, 2019 · Operations
Why Did My MongoDB Logs Turn Into PCX Images? Investigation and Fix
A MongoDB shard node’s logs unexpectedly turned into PCX image files due to improper log rotation using echo, causing CPU spikes and slow‑query analysis failures; the investigation reproduces the issue, explains the header corruption, and presents a SIGUSR1‑based solution to restore proper ASCII logs and retrieve the needed time‑range data.
PCXSIGUSR1log rotation
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