Monitor Memcache Service with Nagios
Monitor Memcached Service with Nagios
In this article, we are going to monitor Memcached Service with most popular monitoring tool called Nagios Monitoring.
I hope you already install Nagios server and NRPE Service if not or you are new who just started working on Nagios then refer below links which help you to clear your doubts regarding Nagios Application.
Read : How to install and configure Nagios Monitoring Server?
Read : How to add a remote host on Nagios server for monitoring?
Default Nagios plugins installation only provide you some plugins which help us to monitor default services and application on the server. In such case, we need to install custom plugins which help us to monitor particular services and applications on Server.
Memcached
Is very important part of the caching mechanism. It will help to improve the speed of your website as well as performance. It is our duty to keep an eye on service running is properly or not and also we can monitor Memcache through Nagios by using the simple custom plugin on the host server.
Below are the parameters we are going to monitor about Memcache :
- Total-free-memory
- Current_items
- Current_connections
- Total_connections
- Limit_maxbytes
Configuration of Memcache Custom Plugin
Step 1 : Install Dependency package
To run custom plugin of Memcache you need to first install dependency package on the server which supports Memcached plugin.
Run below command to install package,
- apt-get install libcache-memcached-perl
Step 2 : Download Memcache custom Plugin
Now download Memcache custom plugin which is use to fetch or monitor Memcache service on the host server.
Download Plugin from below link,
- cd /usr/local/nagios/libexec
- wget http://www.techthings.org/wp-content/uploads/check_memcached.pl.zip
Step 3 : Permissions
Give executable permission to check_memcached.pl plugin using below commands,
- chmod +x check_memcached.pl
Step 4 : Configure Memcache plugin
Open file “nrpe.cfg” which basically resides under /etc/nagios. Add below Memcache monitoring command which helps to fetch information from the host server and send it to Nagios server.
vim /etc/nagios/nrpe.cfg
command[check_memcached]=/usr/local/nagios/libexec/check_memcached.pl -H memcached-ip -p 11211 -t ping
command[check_memcached_threads]=/usr/local/nagios/libexec/check_memcached.pl -H memcached-ip --threads=WARN:5,CRIT:8
Save and close file.
You can also use below parameters for monitoring use threshold values of warning and critical as per your requirement.
/usr/local/nagios/libexec/check_memcached.pl -H memcached-ip --total_free=WARN:value,CRIT:value
/usr/local/nagios/libexec/check_memcached.pl -H memcached-ip --curr_items=WARN:value,CRIT:value
/usr/local/nagios/libexec/check_memcached.pl -H memcached-ip --total_connections=WARN:value,CRIT:value
/usr/local/nagios/libexec/check_memcached.pl -H memcached-ip --curr_connections=WARN:value,CRIT:value
/usr/local/nagios/libexec/check_memcached.pl -H memcached-ip --limit_maxbytes=WARN:value,CRIT:value
Note : To check some other parameters with their threshold values use below help command.
- /usr/local/nagios/libexec/check_memcached.pl --help
Step 5 : Configuration on Nagios Server
Now come to Nagios server and go to the “/usr/local/nagios/etc/” directory. Create a file under remote host directory which I already explained in the previous article.
For more understanding refer link,
Here i have created file in "/usr/local/nagios/etc/clients" directory with name of memcached-service-hosts.cfg
vim /usr/local/nagios/etc/clients/memcached-service-hosts.cfg
define service{
use generic-service
host_name nagios_host
service_description Redis Processes
check_command check_nrpe!check_memcached
}
define service{
use generic-service
host_name nagios_host
service_description Redis Memory Usage
check_command check_nrpe!check_memcached_threads
}
Save and close the file.
Step 6 : Restart Services
Give permissions to created files and restart the nrpe and Nagios service.
- chown -R nagios.nagioscmd memcached-service-hosts.cfg
- /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
- /etc/init.d/nagios-nrpe-server restart
- /etc/init.d/nagios restart
If you’re facing any difficulties while configuring Memcached service monitoring. Please do comment your queries or problem via the comment section, till then stay tuned to techthings.org for more such valuable articles.
I recommended before implementing this article go through below articles which give you more understanding about Nagios Monitoring.
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About The Author
Techthings
Welcome to TechThings. I'm Prashant Thorat, a tech-blogger from Mumbai, India. I started Techthings as a passion and to share my knowledge about technologies. Here at Techthings I write about Linux technologies, Aws Cloud, Wordpress blogging and scripting knowledge. You can read more about me at About us page. Thank You :)
I am trying to get your plugin to run under LibreNMS /usr/lib/nagios/plugins. I have the basics being returned using the following:
./check_memcached.pl -H 10.104.197.240 -p 11211
What other parameters need to be passed via the CLI in order to get the following:
Total-free-memory
Current_items
Current_connections
Total_connections
Limit_maxbytes
Thank you.