Tools - Troubleshooting Skills

Splunk

Search syntax
  • key=value AND OR NOT
  • | sort num(ip) desc, -str(url) | sort -value
  • | reverse
  • | top(or rare) limit=5 name
  • | head 5
  • | highlight fa, fb
  • | dedup fa
  • | stats count by method
  • | chart count by method url
  • | timechart span=15m count by url

earliest=“11/5/2017:20:00:00” latest=“11/12/2017:20:00:00”

Show only Certain Fields

| table field

(Not) contains a field

NOT fa=*

See all values in a field

| top a_number SourceName

Interesting Fields
  • Explore and know what values for a field
Events before or after X seconds
  • Show logs around current event
Visualizations Tab

Linux

crash or reboot?

ast -n2 -x shutdown reboot

  • If this reports a SYSTEM_SHUTDOWN followed by a SYSTEM_BOOT, all is well; however, if it reports 2 SYSTEM_BOOT lines in a row, then clearly the system did not shutdown gracefully

host $ip

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