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log-investigation-tips.md

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Access log

Sample

2014-01-01T00:00:00.000Z mttrs.github.io GET /hello/ HTTP/1.1 200 bytes_sent:11 - Mozilla/4.0 0.0.0.0 response_time:0.001
2014-01-01T00:00:01.000Z mttrs.github.io GET /hallo/ HTTP/1.1 200 bytes_sent:11 - Mozilla/4.0 0.0.0.0 response_time:0.001
2014-01-01T00:00:02.000Z mttrs.github.io GET /gut/ HTTP/1.1 200 bytes_sent:11 - Mozilla/4.0 0.0.0.0 response_time:0.001

Query Per Minutes: QPM

$ grep -Eo '2014-01-01T[0-9]{2}:[0-9]{2}' access.log | sort | uniq -c

3 2014-01-01T00:00

QPM TOP 10

$ grep -Eo '2014-01-01T[0-9]{2}:[0-9]{2}' access.log | sort | uniq -c | sort | head

Query Per Seconds: QPS

$ grep -Eo '2014-01-01T[0-9]{2}:[0-9]{2}:[0-9]{2}' access.log | sort | uniq -c

1 2014-01-01T00:00:00

1 2014-01-01T00:00:01

1 2014-01-01T00:00:02

QPS TOP 10

$ grep -Eo '2014-01-01T[0-9]{2}:[0-9]{2}' access.log | sort | uniq -c | sort -n | head