persistence - How to persist data in Prometheus running in a Docker container?

Question

I'm developing something that needs Prometheus to persist its data between restarts. Having followed the instructions

$ docker volume create a-new-volume
$ docker run 
    --publish 9090:9090 
    --volume a-new-volume:/prometheus-data 
    --volume "$(pwd)"/prometheus.yml:/etc/prometheus/prometheus.yml 
    prom/prometheus

I have a valid prometheus.yml in the right directory on the host machine and it's being read by Prometheus from within the container. I'm just scraping a couple of HTTP endpoints for testing purposes at the moment.

But when I restart the container it's empty, no data from the previous run. What am I missing from my docker run ... command to persist the data into the a-new-volume volume?

question from:https://stackoverflow.com/questions/50009065/how-to-persist-data-in-prometheus-running-in-a-docker-container

Answer 1

Use the default data dir, which is /prometheus. To do that, use this line instead of what you have in your command:

...
--volume a-new-volume:/prometheus 
...

Found here: https://github.com/prometheus/prometheus/blob/master/Dockerfile

Surprisingly is not mentioned in the image docs