Hello,
I am using a Docker version of Prometheus (the latest one) in which I am
setting the value for the retention time (option
*storage.tsdb.retention.time*) at launch. I trying first with small values
like *1m* and *60s* (for 1 minute) or *5m* (for 5 minutes) but I was not
able to see any deletion of the data after this period. Thus, I tested
again this morning with an higher value: *2h* (for 2 hours). I have seen
this information here
<https://medium.com/@valyala/prometheus-storage-technical-terms-for-humans-4ab4de6c3d48>
(in the retention section) that 2h is the minimum value for Prometheus, not
sure if it is true or not. But even with this value, the data stored 4
hours ago can still be retrieved using the HTTP API. Here is my query: *curl
'http://172.18.0.3:9090/api/v1/query_range?query=go_memstats_alloc_bytes&start=2020-03-24T00:01:00.000Z&end=2020-03-24T17:00:00.000Z&step=15s'*
.
On the Prometheus GUI, the flag for this option is correctly setup.
Here is the Docker compose file that is used to launch Prometheus:
prometheus:
command: '--config.file=/etc/prometheus.yml
--storage.tsdb.retention.time=2h'
container_name: remi_prometheus
depends_on:
- cadvisor
expose:
- '9090'
image: prom/prometheus:latest
labels:
project.run.user: remi
networks:
project-bridge:
aliases:
- prometheus
ports:
- published: 9090
target: 9090
volumes:
- remi-prometheus:/prometheus:rw
- /home/remi/Workspace/project/runtime/configuration/prometheus.yml:
/etc/prometheus.yml:rw
Note that I am using cAdvisor to populate Prometheus in which I get some
Golang metrics.
Thus here are my questions:
- What am I doing wrong?
- Was is the minimum value for storage.tsdb.retention.time?
- Is there another option that overwrite the value set in
storage.tsdb.retention.time that I am not aware of?
- Is there a way to test that the option is working if the minimal value
is 1 day? I guess it would be to change the system date, but not sure about
it.
Thanks for the help,
Best regards and good luck if you are under confinement because of this
damn virus :)
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