Jenkins JobDSL examples. Code for blog post https://fishi.devtail.io/weblog/2019/02/09/jenkins-as-code-part-3/

multibranchJobs.groovy

projects = [
    [name: "serviceA", cron: "@daily"], 
    [name: "serviceB", cron: "@hourly"],
    [name: "serviceC", cron: "@daily"],
]

for(project in projects) {

    folder("${project.name}")

    multibranchPipelineJob("${project.name}/build") {
    
        triggers {
            cron("${project.cron}")
        }
    
        orphanedItemStrategy {
            discardOldItems {
                numToKeep(5)
            }
        }   

        branchSources {
            github {
                scanCredentialsId('github-ci-user-credentials')
                repoOwner('devtail')
                repository("${project.name}")
                buildOriginBranch(true)
                buildOriginPRMerge(true)
                buildOriginBranchWithPR(false)
                id("${project.name}-branch-id")
            }
        }

        factory {
            workflowBranchProjectFactory {
     	        scriptPath('jenkinsfile/build.groovy')
            }
        }
    }
}

seedPipeline.groovy

node('master') {
  stage('Checkout') {
    // Clean workspace and checkout shared library repository on the jenkins master
    cleanWs()
    checkout scm
  }

  stage('Seed') {
    // seed the jobs
    jobDsl(targets: 'resources/jobDSL/*.groovy', sandbox: false)
  }
}