Opening storage failed mkdir data/: permission denied

[suyog.k...@gslab.com]

Hi ,

I am using prometheus 2.2.1 . I am trying to mount the /prometheus directory of prometheus pod on host.

   

   volumeMounts
   - name: prometheus-data

     mountPath: /prometheus

volumes

- name: prometheus-data

  hostPath:

    path: /var/lib/prometheus-tsdb

I am getting following error :

Opening storage failed mkdir data/: permission denied.

Please Help

[Chris Marchbanks]

By default Prometheus tries to write data to the data/ directory. To use your mounted directory you can set the flag --storage.tsdb.path=/prometheus in the args you pass to Prometheus.

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Chris Marchbanks | Engineer

FreshTracks.io - Intelligent Alerting for Kubernetes and Prometheus

[Cody Boggs]

One small addition, as of Prometheus 2.x, and Kubernetes > 1.9-ish, Kubernetes deployments need to specify a SecurityContext for the pod to be able to write to whatever directory you've mounted. Add this block, as-is, at the same indentation level as "volumes:" (in words, as part of the pod spec, not a container spec):

securityContext:

  fsGroup: 2000

  runAsNonRoot: true

  runAsUser: 1000

And it should help. :-)

Cody Boggs | Yak Shaver (Ops)

FreshTracks.io

Intelligent Alerting for Kubernetes and Prometheus

To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/CAJc_f7mCb5WkRgP3yGPMyQ6YquU9sfYyS2%2BhXzgDjcq7fPoW0w%40mail.gmail.com.