Prometheus Storage and Remote Storage Retention

[Marko Juričić]

Greetings, 

We have set remote read and write to InfluxDB and that is working just fine, Prometheus Command-Line Flags are after the question. Path of Data is /var/lib/prometheus and as I understood it,

by retention it should be 1s or 0B by size, when we drop the InfluxDB Database there is still few hours of Data stored in var/lib/prometheus and the size is about 500MB. 

Why there is still 500MB of data in var/lib/prometheus folder? Am I doing something wrong with Flags?

Command-Line Flags

alertmanager.notification-queue-capacity	10000
alertmanager.timeout	10s
config.file	/etc/prometheus/prometheus.yml
log.format	logfmt
log.level	info
query.lookback-delta	5m
query.max-concurrency	20
query.max-samples	50000000
query.timeout	2m
rules.alert.for-grace-period	10m
rules.alert.for-outage-tolerance	1h
rules.alert.resend-delay	1m
storage.remote.flush-deadline	1m
storage.remote.read-concurrent-limit	10
storage.remote.read-sample-limit	50000000
storage.tsdb.max-block-duration	100ms
storage.tsdb.min-block-duration	2h
storage.tsdb.path	/var/lib/prometheus/
storage.tsdb.retention	15d
storage.tsdb.retention.size	0B
storage.tsdb.retention.time	1s
storage.tsdb.use-lockfile	false
storage.tsdb.wal-segment-size	0B
web.console.libraries	/etc/prometheus/console_libraries
web.console.templates	/etc/prometheus/consoles
web.cors.origin	.*
web.enable-admin-api	true
web.enable-lifecycle	false
web.external-url
web.listen-address	0.0.0.0:9090
web.local-assets	/usr/share/prometheus/web/
web.max-connections	512
web.page-title	Prometheus Time Series Collection and Processing Server
web.read-timeout	5m
web.route-prefix	/

[Julien Pivotto]

Currently Prometheus requires a WAL to send samples from. It is not possible to disable the local TSDB completely.

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