In the global jenkins configuration we define the jnlp container template with an image from our own registry (jenkins/jnlp-slave:3.16-1). When a job is started it is always tried to load the jenkins/jnlp-slave:alpine image. It seems that our image definition is ignored.

Apr 5 09:17:07 epdl9415 kubelet: I0405 09:17:07.819436 193036 kuberuntime_manager.go:514] Container {Name:jnlp Image:jenkins/jnlp-slave:alpine Command:[] Args:[02f3888416