Prometheus Exporter not able to scrape filesystem metrics from nodes when SELinux is enabled.

This document (000020747) is provided subject to the disclaimer at the end of this document.


Any Linux distribution with SELinux enabled would have this issue. 


Using Prometheus Graphs, when users are trying to query filesystem metrics from nodes, they would not see any metrics due to SELinux being enabled. SELinux policies reject the query due to insufficient privileges. 

PromQL Query: 


Error on the Prometheus exporter pod:

level=error ts=2022-07-21T16:13:08.502Z caller=collector.go:169 msg="collector failed" name=filesystem duration_seconds=0.000837846 err="open /host/proc/1/mounts: permission denied" 



This is not an issue with the Prometheus node exporter from the rancher monitoring chart but rather an issue from the SELinux side. There are three ways to verify that the SELinux team needs to be involved in fixing this issue. 

1.) Disable SELinux, and the Prometheus node exporter should be able to start querying the node-level metrics. (NOT RECOMMENDED)

2.) If SELinux cannot be disabled, you can modify the helm chart and update the Prometheus-node-exporter section with the below seLinuxOption called spc_t, which gives container super-privileged access. (NOT RECOMMENDED)
      type: spc_t
3.) If super-privileged access cannot be provided to the container, ask the SELinux team to create necessary policies for processes to access the files that node-exporter pods are looking for. (RECOMMENDED APPROACH) 


We notice this issue with SELinux enabled cluster nodes.


Top Issue


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  • Document ID:000020747
  • Creation Date: 02-Sep-2022
  • Modified Date:06-Sep-2022
    • SUSE Rancher

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