Incidents

What each incident does and the log signature that gives it away.

Articles in this section

• DDoS floodOne address, thousands of requests a second, and a bandwidth bar going red.
• Memory leakOne process on one host whose resident memory only ever goes up.
• Disk fullA mount point filling up, and writes that start failing at the top.
• Database lock pile-upHealthy web servers, a latency graph going vertical, and queries waiting on each other.
• OverheatingA hardware fault that a software answer cannot fix, and a thermal shutdown waiting at 95 °C.
• Runaway scheduled jobA backup that starts around three in the morning and pins the CPU until something stops it.
• Certificate expiryAn attention test — one early warning line, then handshakes that stop working.