How to define workspace volume for jenkins pipeline declarative - jenkins

Question

I am trying to setup declarative pipeline where I would like to persiste workspace as volume claim so large git checkout can be faster. Based on doc there are options workspaceVolume and persistentVolumeClaimWorkspaceVolume but I am not able to make it work - jenkins always does following:
volumeMounts:
- mountPath: "/home/jenkins/agent"
name: "workspace-volume"
readOnly: false
volumes:
- emptyDir: {}
name: "workspace-volume"

Answer 1

Try something like
podTemplate(
containers: [
containerTemplate(name: 'tree', image: 'iankoulski/tree', ttyEnabled: true, command: 'cat')
],
workspaceVolume: persistentVolumeClaimWorkspaceVolume(claimName: 'workspace', readOnly: false),
) {
node(POD_LABEL) {
stage('read workspace') {
checkout scm
container('tree') {
sh 'env'
sh 'tree'
sh 'test -f old-env.txt && cat old-env.txt'
sh 'env > old-env.txt'
}
}
}
}

Answer 2

Here is an example for declarative pipeline:
pipeline {
agent {
kubernetes {
yamlFile 'jenkins/pv-pod.yaml'
workspaceVolume persistentVolumeClaimWorkspaceVolume(claimName: 'workspace', readOnly: false)
}
}

Answer 3

If you post your jenkins deployment then I might help in that.
Mean while you can visit this yaml that I used and worked very well for me.
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: jenkins
spec:
replicas: 1
template:
metadata:
labels:
app: jenkins
spec:
containers:
- name: jenkins
image: jenkins:2.32.2
ports:
- containerPort: 8080
volumeMounts:
- name: jenkins-home
mountPath: /var/jenkins_home
volumes:
- name: jenkins-home
emptyDir: {}