Monitor Engine issue

[tpwebb]

From recommendation of previous post, I have created a new entry

For the monitoring engine not starting issue, what errors are you seeing and where exactly? Try starting it directly on the command line with:

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/usr/local/nagios/bin/nagios /usr/local/nagios/etc/nagios.cfg

I have attached the profile and the session txt file from the above command


Regards
Terrence

Moderator's Note: The profile has been shared with the support team but has been removed from the public forum.

[benjaminsmith]

Hi Terrace,

Looking over the logs in the profile, I noticed that SELinux is enabled on this server, and that's not compatible with Nagios XI.

SELinux policy enabled; httpd running as context system_u:system_r:httpd_t:s0

Lets disable that and run a full re-start, then let me know if the issue is resolved.

Disable SELinux on CentOS 7 / RHEL 7 / Fedora Linux

The run through the following commands to do a full restart:

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systemctl stop crond
systemctl stop npcd
systemctl stop nagios
pkill -9 -u nagios
rm -rf /usr/local/nagiosxi/var/dbmaint.lock
rm -rf /usr/local/nagiosxi/var/event_handler.lock
rm -rf /usr/local/nagiosxi/scripts/reconfigure_nagios.lock
systemctl restart mariadb
systemctl start nagios
systemctl start npcd
systemctl start crond

If you're still having issues, please attach the database log to the ticket. Thanks, Benjamin

Reference:
Nagios XI Log Locations and Descriptions

[tpwebb]

Hello,

I have verified that SELinux is disabled, and ensured it is disabled in the

SELinux status: disabled

[root@nagios mysql]# getenforce
Disabled
[root@nagios mysql]#

I have also checked the file "/etc/selinux/config" and it is disabled.

The log still shows the SELinux policy is enabled

The database log file is below

mysqld.zip

Regards

Terrence.

[benjaminsmith]

Hi Terrence,

Thanks for the logs. Actually, the current database log does look better, I'm not seeing the following error in that one:

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2020-07-20T07:35:22.976508Z 0 [Warning] [MY-010909] [Server] /usr/libexec/mysqld: Forcing close of thread 415  user: 'ndoutils'.

Have you noticed any improvement or is the monitoring engine still stopping? One thing I noticed the following on the command subsystem log:

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usr/local/nagios/etc/hosts: Cannot utime: Operation not permitted

Log in as root and run the following script:

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/usr/local/nagiosxi/scripts/reset_config_perms.sh

Also, let's check the max connection on the database, what is the output to the following commands:

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mysql -uroot -pnagiosxi -e "show variables like 'max_connections';"
mysql -uroot -pnagiosxi -e "show global status like 'Max_used_connections';"

Can you send us an updated profile, I'd like to see if the load has come down and check the logs once more. If this is affecting your monitoring, we can also roll back ndo if necessary, please let me know.