Monitoring dashboard for Jenkins memory usage analysis.
This article will give details about installing monitoring plugin for monitoring Jenkins health and use cases.
pre-requisites :
You should have basic knowledge about Jenkins , also have some basic idea about java memory management before installing this plugin for monitoring your jenkins setup .
Why to install monitoring dashboard for Production Jenkins setup?
To have live debugging details about what happens with Jenkins setup internally . It will help to debug Jenkins performance issues related to :
- Java config .
- Memory param .
- Slowness .
- CPU consumption .
- To check deadlock threads .
- User can download heap dump from ui .
- User can download thread dump of application without impacting running setup .
- Active and logged-in users details .
Here are the steps to integrate monitoring dashboard:
- Install monitoring plugin .
- Manage Jenkins
- Manage Plugins
- Search Monitoring plugin
- Install monitoring plugin
Use case :
With help of monitoring plugin , you can see below dashboard which is showing details of RAM , CPU, Heap memory usage , active user sessions , thread details , error logs which will help us to have run time or live debugging information for entire setup .
Monitoring groovy scripts Examples :
you can execute groovy scripts in Jenkins UI (http://localhost:8080/script)
1)Execute GC manually :
import net.bull.javamelody.*;
import net.bull.javamelody.internal.model.*;
import net.bull.javamelody.internal.common.*;
before = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
System.gc();
after = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
println I18N.getFormattedString("ramasse_miette_execute", Math.round((before - after) / 1024));
2.Display some memory data
import net.bull.javamelody.*;
import net.bull.javamelody.internal.model.*;
import net.bull.javamelody.internal.common.*;
memory = new MemoryInformations();
println "\nused memory:\n " + Math.round(memory.usedMemory / 1024 / 1024) + " Mb";
println "\nmax memory:\n " + Math.round(memory.maxMemory / 1024 / 1024) + " Mb";
println "\nused perm gen:\n " + Math.round(memory.usedPermGen / 1024 / 1024) + " Mb";
println "\nmax perm gen:\n " + Math.round(memory.maxPermGen / 1024 / 1024) + " Mb";
println "\nused non heap:\n " + Math.round(memory.usedNonHeapMemory / 1024 / 1024) + " Mb";
println "\nused physical memory:\n " + Math.round(memory.usedPhysicalMemorySize / 1024 / 1024) + " Mb";
println "\nused swap space:\n " + Math.round(memory.usedSwapSpaceSize / 1024 / 1024) + " Mb";
You can also configure job and schedule cron to monitor jenkins setup by adding groovy script in job , configure mail , slack alerting based on threshold config and failure scenarios .
Check below reference URL for more details for other available scripts supported by monitoring plugin , you do modifications as per your requirement and use this scripts for actively monitoring your setup .
Help URL :
https://wiki.jenkins.io/display/JENKINS/Monitoring+Scripts
Add comment it this tutorial helpful to you .
