How to upgrade Jenkins and Reset Admin Password

How to upgrade Jenkins & reset password

Jenkins is a free open source continuous integration and continuous delivery tool. It used to automate the deployment process, software development related to building and testing. We can run jenkins on a container or on a server(Window/Linux). Jenkins supports many version control tools such as Git, CVS, apache maven, Subversion etc.

Benefits to upgrade Jenkins version

There are many benefits to upgrade jenkins version:-

• In the latest version of jenkins we are getting the upgrade version of plugins.
• Latest version removes page generation timestamp from the footer.
• It allow users with Overall/Manage permission to configure Node Monitoring and to reload configuration from disk
• It support Bearer tokens in Jenkins-CLI -auth parameter
• Fixed all the bugs related to plugins.

Also Read: SonarQube integration with Jenkins

Steps to upgrade Jenkins version

It is critical to keep your Jenkins up-to-date when you are using it in the production environment. So we need to keep a few things in mind that we have backup of all the things 

To identify which Jenkins Version we have to upgrade just simply login to the Jenkins server, click on ‘Manage Jenkins' menu item, it will display the following message at the top: New version of Jenkins is available for download as shown below.

So now we find that we have to upgrade our jenkins version to 2.9 version.

The first step is we have to to download the war file by running command 

cd ~/

wget http://updates.jenkins-ci.org/download/war/2.9/jenkins.war

Now we have to replace this jenkins.war file with the old version of jenkins and the path where we have to replace it in /usr/lib/jenkins directory.

Before replacing this new war file we have to take backup of the existing version of jenkins war file.

cp /usr/lib/jenkins/jenkins.war ~/jenkins.war.old.version

Then run, cp ~/jenkins.war /usr/lib/jenkins/

Also Read: How To Create A Custom Cache Server Using Nginx

After this restart the jenkins server

• systemctl stop jenkins
• systemctl start jenkins

After this process to verify the version just login to the jenkins server and click on ‘Manage Jenkins'. And, we’ll not see that upgrade available message anymore.

Reset Jenkins Password

• In case we have forgotten the jenkins password then We have to locate the config.xml in the /var/lib/jenkins/ directory. 
• Then replace the value  true to false in config.xml file 
• <useSecurity>false</useSecurity>

save this file and then restart the jenkins server 

sudo service jenkins restart

After that just login to the jenkins server it will not ask you the username and password to login on that. 

• Click on People on the left-hand navigation menu.
• Click on the Admin.
• Delete the user account.
• And then create a new admin user 

Also, Read AWS Application Load Balancer Vs. NGINX Plus!

We can also reset it without disabling security if you're using matrix permissions

• In config.xml, set disableSignup to false.
• Restart Jenkins.
• Open the Jenkins web page and sign up with a new user.
• In config.xml, duplicate one of the <permission>hudson.model.Hudson.Administer:username</permission> lines and replace username with the new user.
• If this is a private server, set disableSignup back to true in config.xml.
• Restart Jenkins.
• Go to the Jenkins web page and log in as the new user.
• Reset the password of the original user.
• Log in as the original user.

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