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I'm running Jenkins 2 with the Pipeline plugin. I have setup a Multi-branch Pipeline project where each branch (master, develop, etc.) has a Jenkinsfile in the root. Setting this up was simple. However, I'm at a loss for how to have each branch run periodically (not the branch indexing), even when the code does not change. What do I need to put in my Jenkinsfile to enable periodic builds?
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Jenkins Cron Syntax From the Jenkins code documentation: To allow periodically scheduled tasks to produce even load on the system, the symbol H (for “hash”) should be used wherever possible. For example, using 0 0 * * * for a dozen daily jobs will cause a large spike at midnight.
Step 1: From the Jenkins home page create a “new item”. Step 2: Select the “Multibranch pipeline” from the option and click ok. Step 3: Click “Add a Source” and select Github. Step 4: Under the credentials field, select Jenkins, and create a credential with your Github username and password.
If we want to trigger our build periodically we need check the "Build periodically" option in the build section. However In the Multilbranch Pipeline the we do not have the build trigger section available. If We want to "Build periodically" for a multibranch pipeline then we need to change our Jenkinsfile to do that.
If you use a declarative style Pipeline and only want to trigger the build on a specific branch you can do something like this:
String cron_string = BRANCH_NAME == "master" ? "@hourly" : "" pipeline { agent none triggers { cron(cron_string) } stages { // do something } } Found on Jenkins Jira
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