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### Continuous Query

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jdubois 2022-02-03 11:18:07 +01:00
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HowtoInfluxDB.md
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@ -227,3 +227,22 @@ Le [check NRPE](HowtoIcinga) suivant peut être mis en place :
~~~
command[check_influxdb]=/usr/lib/nagios/plugins/check_http -I 127.0.0.1 -u /health -p 8086 -r '"status":"pass"'
~~~
### Continuous Query
Les "continuous queries" (ou requêtes continues) sont des requêtes qui sont exécutées automatiquement et périodiquement sur les données en temps réel, pour ensuite en stocker le résultat.
Par exemple, pour créer des mesures "switch_bps_tx" et "switch_bps_rx" avec le champ "bitspersec" où est converti le nombre total d'octets transmis par une interface et récupéré toutes les minutes, en une mesure en bits par secondes, toutes les minutes également :
~~~
# influx
> CREATE CONTINUOUS QUERY "Interface-Traffic-Conversion_TX" ON collectd BEGIN SELECT non_negative_derivative(mean(value), 1s) * 8 AS bitspersec INTO collectd.autogen.switch_bps_tx FROM collectd.autogen.snmp_tx WHERE type = 'if_octets' GROUP BY host, type_instance, time(1m) END
> CREATE CONTINUOUS QUERY "Interface-Traffic-Conversion_RX" ON collectd BEGIN SELECT non_negative_derivative(mean(value), 1s) * 8 AS bitspersec INTO collectd.autogen.switch_bps_rx FROM collectd.autogen.snmp_rx WHERE type = 'if_octets' GROUP BY host, type_instance, time(1m) END
> SHOW CONTINUOUS QUERIES
name: collectd
name query
---- -----
Interface-Traffic-Conversion_TX CREATE CONTINUOUS QUERY "Interface-Traffic-Conversion_TX" ON collectd BEGIN SELECT non_negative_derivative(mean(value), 1s) * 8 AS bitspersec INTO collectd.autogen.switch_bps_tx FROM collectd.autogen.snmp_tx WHERE type = 'if_octets' GROUP BY host, type_instance, time(1m) END
Interface-Traffic-Conversion_RX CREATE CONTINUOUS QUERY "Interface-Traffic-Conversion_RX" ON collectd BEGIN SELECT non_negative_derivative(mean(value), 1s) * 8 AS bitspersec INTO collectd.autogen.switch_bps_rx FROM collectd.autogen.snmp_rx WHERE type = 'if_octets' GROUP BY host, type_instance, time(1m) END
~~~