[Prometheus] Kindly could you detail better: --web.external-url --web.route-prefix nginx

[fchiorascu]

• Proposal
  Use case. Why is this important?
  It's a good practice to have something well defined, I'we noticed around internet multiple configurations ~ 15 different ones, maybe will be best to detail how is recommended.

Because is confusing and I think there is a bug in new version of prometheus 2.5.0.
Or is something related to migration, I've moved the data and put it again in the new partition created and restarted prometheus.

It's a matter of selinux context?
# ls -ldZ /data/prometheus
drwxr-xr-x. prometheus prometheus unconfined_u:object_r:var_t:s0   /data/prometheus
# ls -ldZ /opt/prometheus
drwxr-xr-x. prometheus prometheus unconfined_u:object_r:usr_t:s0   /opt/prometheus
# ls -ldZ /opt/prometheus/prometheus
-rwxr-xr-x. prometheus prometheus unconfined_u:object_r:usr_t:s0   /opt/prometheus/prometheus

• I already tried:

https://www.robustperception.io/using-external-urls-and-proxies-with-prometheus
https://www.robustperception.io/external-urls-and-path-prefixes
https://prometheus.io/docs/guides/tls-encryption/#nginx-example
https://groups.google.com/forum/#!topic/prometheus-users/bA6rFgOLGTE
https://github.com/prometheus/prometheus/issues/1583
etc...

-Bug Report
When going to: https://prometheus1monitoring/prometheus >> Graph >> Error loading available metrics!

• What did you expect to see?
  To have the possibility to make a query for metrics.
  If i try to make a tunnel it's working fine without using nginx.

• What did you see instead? Under which circumstances?
  I've tried all the possible choices:
  Error loading available metrics!

Environment

• System information:
  Linux 3.10.0-862.14.4.el7.x86_64 x86_64
• Prometheus version:
  2.5.0
• Alertmanager version:
  0.15.3

[simonpasquier]

Thanks for your report. It looks as if this is actually a question about usage and not development.

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