How will you install Jenkins ?
In what are the ways you can install Jenkins ?
Jenkins as service in linux server
Jenkins as Docker Containers
Jenkins as Pod in Kubernetes
How you can install plugins in Jenkins ?
What is Global Tool Configuration in Jenkins ?
Global Tool Configurations in Jenkins is used to install and configure multiple versions of tools like maven, gradle, Java, Node Js …
For installing the tools, we have to install the respective plugins. Eg: To have multiple versions of Node Js we have to install NodeJS plugin
Configure Global Tool Configuration
How to securely store Credentials in Jenkins ?
We can securely store credentials in Jenkins using Credentials section in Manage Jenkins
How to copy Jenkins configuration data from server to another server ?
Simply copy the jenkins home directory or use aws ebs(Any network storage, create snapshots out of it and move to another server)
How to restore the Deleted job ?
Using Job Configuration History plugin we can restore the deleted Job.
This plugin saves a copy of the configuration file of jobs and agents (config.xml) for every change made and of the system configuration.
How to take backup of the jenkins
Generally just copy the JENKINS_HOME directory for copy, we can use ThinBackup plugin to do the backup
ThinBackup: https://devopscube.com/jenkins-backup-data-configurations/
To move the jenkins_home directory to another path and create the symlink (We can also use AWS EBS and mount)
1.Shutdown you Jenkins.
Move all files from /var/lib/jenkins to /app/jenkins
mv /var/lib/jenkins /app/
Replace /var/lib/jenkins with a symbolic link to /app/jenkinsln -s /app/jenkins /var/lib/jenkins
Start Jenkins again.That way all the files are actually stored under /app but all paths to /var/lib/jenkins stay valid due to the symbolic link.
GitHUb webhook and what is application/json in it
How the tenants(multiple customers/products) are isolated in single jenkins instance
Using Folder concept(Folder plugin needs to be installed)
Each tenant will be assigned with one Folder and the jobs are created under that Folder. The credentials are also created and managed in the folder itself
We can restrict user to access particular Folder, so that other tenants folder will not be shown to the user