Understanding what runs where in Jenkins + Kubernetes

where-do-i-run.groovy

node {
    def hostname = readFile '/etc/hostname'
    echo "Local node hostname: $hostname"
}

node('kubernetes') {
    def hostname = readFile '/etc/hostname'
    echo "Kubernetes slave hostname: $hostname"
}

node('kubernetes') {
    kubernetes.pod('mypod').withImage('maven').inside { 
        def hostname = readFile '/etc/hostname'
        echo "Kubernetes slave in pod hostname: $hostname"
    }
}