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Logs hunting
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Olivier Dolbeau
April 09, 2015
Programming
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Logs hunting
Talk given at sfLive 2015 Paris
Olivier Dolbeau
April 09, 2015
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Transcript
LOGS HUNTING 1
WHO AM I? Olivier Dolbeau @odolbeau Work at BlaBlaCar 2
THIS IS AN ELK 3
4
5
6
Inputs Filters Outputs 41 inputs • syslog • udp •
varnishlog • gelf • … 50 filters • date • geoip • i18n • urldecode • … 55 outputs • elasticsearch • redis • email • graphite • … And there are also some codecs 7
Kibana 8
9
10
Which logs are we talking about? 11
12 Access Logs Population: High Difficulty: Easy Weapon
13 Application logs Population: Medium / Low Difficulty: Medium Weapon
Monolog <3
syslog 14 Syslog Population: Medium Difficulty: Easy Weapon RSYSLOG
*.* @127.0.0.1:514;RSYSLOG_ForwardFormat 15
input { udp { port => 514 type => syslog
} } Logstash - Input 16
filter { if [type] == "syslog" { grok { match
=> [ "message", "<%{POSINT:syslog_pri}>% {TIMESTAMP_ISO8601:syslog_timestamp} %{SYSLOGHOST:syslog_hostname} % {DATA:syslog_program}(?:\[%{POSINT:syslog_pid}\])?: % {GREEDYDATA:syslog_message}" ] add_field => [ "received_at", "%{@timestamp}" ] add_field => [ "received_from", "%{host}" ] add_tag => [ "rsyslog" ] } } } Logstash - Filter 17
output { elasticsearch_http { host => “my_es.blablacar.com” port => 9200
index => "logstashv1-%{+YYYY.MM.dd}" manage_template => false } } Logstash - Output 18
19
syslog 20
21
@odolbeau 22 On recrute ! https://speakerdeck.com/odolbeau/logs-hunting