Munin : Set Thresholds

Munin : Set Thresholds 2015/06/11

	The monitoring target items are set as plugins and thresholds are defined in some plugins by default, but if you'd like to add more thresholds to a plugin, configure like follows.
[1]	It's possible to confirm plugins like follows.

# current enabled plugins are located under the directory below [root@dlp ~]#  ls /etc/munin/plugins  cpu fw_packets ntp_kernel_pll_freq processes df if_err_eth0 ntp_kernel_pll_off proc_pri df_inode if_eth0 ntp_offset swap diskstats interrupts ntp_states threads entropy irqstats open_files uptime forks load open_inodes users fw_conntrack memory postfix_mailqueue vmstat fw_forwarded_local ntp_kernel_err postfix_mailvolume # installed plugins are located under the directory below [root@dlp ~]#  ls /usr/share/munin/plugins  acpi nvidia_ amavis open_files apache_accesses open_inodes apache_processes openvpn apache_volume perdition ..... .....

[2]	It's possible to display current values for each plugin.

# display values for cpu plugin [root@dlp ~]#  munin-run cpu  user.value 4262 nice.value 680 system.value 1933 idle.value 1069496 iowait.value 1891 irq.value 0 softirq.value 52 steal.value 208 guest.value 0 # display values for df plugin [root@dlp ~]#  munin-run df  _dev_mapper_centos_root.value 4.34168354184342 _dev_vda1.value 25.3611960958576

[3]	Set threshold's value in munin.conf like follows. ⇒ [plugin name].[field name].[warning | critical] min-value:max-value  The field name is just the one which is displayed when executing "munin-run" command. The min-value or max-value can be omitted.

[root@dlp ~]#  vi /etc/munin/munin.conf # set threshold on target node [dlp.srv.world]     address 127.0.0.1     use_node_name yes      # set 80% of warning and 90% of critical for user field in cpu plugin     cpu.user.warning :80     cpu.user.critical :90      # set 80% of warning and 90% of critical for root partition field in df plugin     df._dev_mapper_VolGroup_lv_root.warning :80     df._dev_mapper_VolGroup_lv_root.critical :90

[4]	If you configured notification setting and a value is over from the threshold's value, the email is sent like follows.

From munin@dlp.srv.world Fri Jun 12 14:35:07 2015 Return-Path: <munin@dlp.srv.world> X-Original-To: root Delivered-To: root@dlp.srv.world Date: Fri, 12 Jun 2015 14:35:07 +0900 To: root@dlp.srv.world Subject: Munin-notification for srv.world::dlp.srv.world User-Agent: Heirloom mailx 12.5 7/5/10 Content-Type: text/plain; charset=us-ascii From: munin@dlp.srv.world (Munin user) Status: R srv.world :: dlp.srv.world :: CPU usage CRITICALs: user is 100.38 (outside range [:80]).