Nagios Support Forum

• https://support.nagios.com/forum/viewtopic.php?f=6&t=50016#p260641
• https://linux.die.net/man/1/rrdxport

/usr/local/nagios/etc/pnp/process_perfdata.cfg

TIMEOUT = 20

• services are Caught SIGSEGV, shutting down
• mysqli::mysqli(): (08004/1040): Too many connections
• NPCD: WARN: MAX load reached: load
• TIMEOUT: /var/nagiosramdisk/spool/perfdata

I spent the majority of the weekend looking into some of the solutions that you have proposed and Nagios Core/XI docs, and had some follow up questions.

Our DB connections are set to default MariaDB max of 151. What do you suggest as a value? Would there be any value in tuning the memory buffer capacity as well? we have about 32 GB on the box (virtual)

MariaDB [(none)]> SHOW VARIABLES LIKE 'max_connections';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| max_connections | 151 |
+-----------------+-------+
1 row in set (0.00 sec)

--- How much value would there be in tuning the following performance values to mitigate load in our current environment---

Dashlet Refresh Multiplier - currently 1000. We have these displayed on wallmonitors in our office, but if I were to change to 3000 or even 5000, how much would that offset load by reducing AJAX calls?

Use Unified Tactical Overview - Use Unified Hostgroup Screens - Use Unified Servicegroup Screens
AFAIK, we don't use any custom widgets in our dashboards, but we do have custom dashes (not elements) for user logins. Would toggling the following on change the dashes when users log in?

Disabling subsystem logging? What details would be lost by disabling this? How much performance gain?

Setting host check interval to 0 - would the performance saving by caching the host checks/relying on service checks be worth instituting in our environment? Is there any value/load reduction in setting up host/service dependencies for check/notification?

The RAMDISK page doesn't have any optimization content that I can see. It seems that all the directives are the same that are in our environment. I just ran the script provided by Nagios when setting it up. Here's a df -h

[htadmin@bnalmnag702 ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 4.0K 16G 1% /dev/shm
tmpfs 16G 138M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/mapper/VolGroup00-vg00_lv_root 242G 58G 174G 25% /
/dev/sda1 477M 194M 254M 44% /boot
/dev/mapper/VolGroup00-vg00_lv_tmp 7.9G 18M 7.5G 1% /tmp
/dev/mapper/VolGroup00-vg00_lv_home 8.4G 22M 8.0G 1% /home
/dev/mapper/VolGroup00-vg00_lv_var_log 16G 5.1G 9.8G 35% /var/log
/dev/mapper/VolGroup00-vg00_lv_var_log_audit 3.9G 50M 3.6G 2% /var/log/audit
tmpfs 1000M 42M 959M 5% /var/nagiosramdisk

Seems like its in use, but pretty low.

The reaper settings were previously configured in a previous post
check_result_reaper_frequency=3
max_check_result_reaper_time=10

Would changing these even lower have any benefit?

These are the top "offenders" for service time executions

Service: CPU Statistics Average Execution Time: 5.122 (sec) NumChecks: 2
Service: CPU Stats Average Execution Time: 5.144 (sec) NumChecks: 846
Service: Yum Updates Average Execution Time: 5.873 (sec) NumChecks: 7
Service: check_LCKW Average Execution Time: 15.728 (sec) NumChecks: 1

Would changing the freshness thresholds/cache for these make a difference?

The check_LCKW needs to be reported in real-time. Written in bash, would compiling these be suggested?