Bug 48746 – Nagios event log: Error: Could not open log file '/var/log/nagios/nagios.log' for reading!

Bug 48746 - Nagios event log: Error: Could not open log file '/var/log/nagios/nagios.log' for reading!


Summary:	Nagios event log: Error: Could not open log file '/var/log/nagios/nagios.log'...

Status:	RESOLVED WONTFIX

Product:	UCS
Classification:	Unclassified
Component:	Monitoring (Prometheus or Nagios)
Version:	UCS 4.3
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	---
Assigned To:	UCS maintainers
QA Contact:	UCS maintainers

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2019-02-25 11:00 CET by Valentin Heidelberger
Modified:	2021-05-14 16:34 CEST (History)
CC List:	7 users (show)

See Also:
What kind of report is it?:	Bug Report
What type of bug is this?:	4: Minor Usability: Impairs usability in secondary scenarios
Who will be affected by this bug?:	2: Will only affect a few installed domains
How will those affected feel about the bug?:	2: A Pain – users won’t like this once they notice it
User Pain:	0.091
Enterprise Customer affected?:	Yes
School Customer affected?:
ISV affected?:
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Description Valentin Heidelberger

2019-02-25 11:00:23 CET

Nagios "Event Log" page (in the left menu in the "Reports" category) seems to be broken by default in the Nagios app.
It just shows an error after the installation of the app:

Error: Could not open log file '/var/log/nagios/nagios.log' for reading!


This seems to be a problem with permissions.
-rw-r----- 1 nagios nagios 19768 Feb 22 22:32 /var/log/nagios/nagios.log

I've managed to get it working by adding the user "www-data" to the group "nagios" and restarting apache2. Adding the "nagios" user to the "www-data" group and executing "chown nagios:www-data" on the file works as well but I'm not entirely certain which is better from a security perspective.

Comment 1 Dirk Ahrnke

2019-10-01 17:26:27 CEST

seen this while upgrading a customer environment to 4.4-1

Comment 2 Dirk Schnick

2020-01-29 11:42:43 CET

In my test-enviroment same problem.

Solved also by adding the group nagios to the user www-data

Comment 3 tom.mailbox 2020-06-23 08:23:08 CEST

The same behavior for me with UCS 4.3 and also after a fresh installation of UCS 4.4.
Nagios module was added after the initial installation, not selected during the installation.

Comment 4 Ingo Steuwer

2021-05-14 13:56:12 CEST

This issue has been filed against UCS 4.3.

UCS 4.3 is out of maintenance and many UCS components have changed in later releases. Thus, this issue is now being closed.

If this issue still occurs in newer UCS versions, please use "Clone this bug" or reopen it and update the UCS version. In this case please provide detailed information on how this issue is affecting you.