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Jenkins Troubleshooting

Jenkins Troubleshooting

Jenkins is one of the important CI tools which many organization used as part of their Build and DevOps infrasture. I am going to consolidate all the troubshooting techniques which can be used in order to find any issues related in jenkins.

Step 1. Take a look at Log generated by the jenkins and plugins via http://jenkins-master/log

Note: Here you can also create your own logger and and set your custom log levels such as (severe, warning, info, config, file, finer, finest, all)

Step 2. Also, you can look at /var/log/jenkins/jenkins.log via doing "tail -f /var/log/jenkins/jenkins.log" and check carefully whats breaking it. 

Log file in windows - jenkins.err.log & jenkins.out.log

Slave log file in windows - logs\slaves

Step 3. Check the system log file

Step 4. Few Jenkins plugins which can you help you
https://wiki.jenkins-ci.org/display/JENKINS/Monitoring

Step 4. Make sure your Jenkins & installed plugins version is installed with most uptodate stable release.

Some Common issues:
Issues 1. If Jenkins hangs, follow https://wiki.jenkins-ci.org/display/JENKINS/Jenkins+is+hanging

Issues 2 Site is down with no 404 messages
Cause- Jenkins had an Out of Memory (OOM) error causing the server to kill the jenkins instance
Solution: Restart server; Review heap logs to identify root cause of error

Issues 3 Site is up however no jobs are displayed
Cause 1: AWS Server rebooted but data volume did not mount properly
Solution: mount <device> <path> on the instance

Issues 4 - java.lang.outofmemoryerror permgen space issues

Solution - http://www.scmgalaxy.com/scm/build-workflow-management/jenkins/jenkins-java-lang-outofmemoryerror-permgen-space-issues.html

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Rajesh Kumar

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Total, Over 12 years of extensive experience in the Software Configuration Management domain having depth knowledge of DevOps, Continuous Integration and Delivery, Configuration Management, Build and Installer, Release Management and Application Management.

What corporate management say about us?

Rajesh is very knowledgeable instructor he has a good exposure on real time issue and case studies he is experienced in large environment issue and challenges. I really liked how Rajesh used a lot of examples so that concepts were more easily understood, I like the examples that Rajesh give to help us remember things…they are usually real scenario, real life problems that we encounter frequently. <br /> He is well organised in terms of study materiel that you can refer anytime after you complete your course. His blogs are crisp and has to the point key content that he discussed during session to remember if you refer them remotely.

Gaurav Vishnoi
I am having 11+ years of experience in java, due to increasing complexity of system and environment I opted for this tanning and find it very useful., Noida
Sep 02, 2016