Home » Categories » Multiple Categories | ||||||||||
How To Create Nagios Plugins With PHP On CentOS 6 |
||||||||||
Article Number: 284 | Rating: Unrated | Last Updated: Mon, Jan 6, 2014 at 1:49 AM
|
||||||||||
PHP is a popular programming language that allows you to quickly create scripts and install additional libraries. This time, we will expand on this idea and create Nagios plugins using PHP. Step 1 - Install RPMForge Repository and NRPE on clientrpm -ivh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm yum -y install php nagios-nrpe useradd nrpe && chkconfig nrpe on Step 2 - Create your PHP ScriptIt would be a good idea to keep your plugins in same directory as other Nagios plugins (/usr/lib64/nagios/plugins/ for example). For our example, we will create a script that checks current disk usage by calling "df" from shell, and throw an alert if it is over 85% used: #!/usr/bin/php <?php $used_space=chop(shell_exec("df -h / | grep -v Filesystem | awk '{print $5}'")); switch ($used_space) { case "$used_space" < "85%": print "OK - $used_space of disk space used."; exit(0); case "$used_space" == "85%": print "WARNING - $used_space of disk space used."; exit(1); case $used_space > "85%": print "CRITICAL - $used_space of disk space used."; exit(2); default: print "UNKNOWN - $used_space of disk space used."; exit(3); } ?> ![]() We will save this script in /usr/lib64/nagios/plugins/usedspace.php and make it executable:
chmod +x /usr/lib64/nagios/plugins/usedspace.php The entire Nagios NRPE plugin boils down to using exit codes to trigger alerts. You introduce your level of logic to the script, and if you want to trigger an alert (whether it is OK, WARNING, CRITICAL, or UNKNOWN) - you specify an exit code. Refer to the following Nagios Exit Codes: Nagios Exit Codes
Step 3 - Add Your Script to NRPE configuration on client hostDelete original /etc/nagios/nrpe.cfg and add the following lines to it: log_facility=daemon pid_file=/var/run/nrpe/nrpe.pid server_port=5666 nrpe_user=nrpe nrpe_group=nrpe allowed_hosts=198.211.117.251 dont_blame_nrpe=1 debug=0 command_timeout=60 connection_timeout=300 include_dir=/etc/nrpe.d/ command[usedspace_php]=/usr/lib64/nagios/plugins/usedspace.php Where 198.211.117.251 is our monitoring server from previous articles. Change these to your own values. Make sure to restart Nagios NRPE service: service nrpe restart Step 4 - Add Your New Command to Nagios Checks on Nagios Monitoring ServerDefine new command in /etc/nagios/objects/commands.cfg define command{ command_name usedspace_php command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c usedspace_php } As you can see, it uses NRPE to make TCP connections to port 5666 and run command 'usedspace_php', which we defined in /etc/nagios/nrpe.cfg on that remote host. Add this check to your Nagios configuration file for client. For our example, we will monitor a server called SeverCentOS and edit /etc/nagios/servers/ServerCentOS.cfg define service { use generic-service host_name ServerCentOS service_description Custom Disk Checker In PHP check_command usedspace_php }Restart Nagios: service nagios restart Verify that the new check is working and you are all done! |
||||||||||
Attachments
![]()
There are no attachments for this article.
| ||||||||||
How To Change Themes and Adjust Settings in Ghost
Viewed 4289 times since Thu, Dec 26, 2013
How To Create Nagios Plugins With Bash On CentOS 6
Viewed 3626 times since Sat, Jan 4, 2014
How To Install LAMP (Linux, Apache, MySQL, PHP) on Fedora
Viewed 3929 times since Thu, Jan 2, 2014
How To Set Up an NFS Mount on CentOS 6
Viewed 8863 times since Tue, Dec 31, 2013
How To Use a Simple Bash Script To Restart Server Programs
Viewed 3353 times since Fri, Dec 27, 2013
How to Setup Additional Entropy for Cloud Servers Using Haveged
Viewed 2667 times since Sat, Jan 4, 2014
How To Install Linux, Apache, MySQL, PHP (LAMP) stack On CentOS 6
Viewed 6662 times since Thu, Dec 26, 2013
How To Install Nagios On CentOS 6
Viewed 3491 times since Sat, Jan 4, 2014
How To Create Nagios Plugins With Python On CentOS 6
Viewed 3795 times since Sat, Jan 4, 2014
How To Configure Secure Updates and Installations in WordPress on Ubuntu
Viewed 5423 times since Sat, Jan 4, 2014
|