Kaniko Image Cache in Jenkins Kubernetes Agents - kubernetes

Question

Here's the Jenkinsfile, I'm spinning up:
pipeline {
agent {
kubernetes {
yaml '''
apiVersion: v1
kind: Pod
metadata:
name: kaniko
namespace: jenkins
spec:
containers:
- name: kaniko
image: gcr.io/kaniko-project/executor:v1.8.1-debug
imagePullPolicy: IfNotPresent
command:
- /busybox/cat
tty: true
volumeMounts:
- name: jenkins-docker-cfg
mountPath: /kaniko/.docker
- name: image-cache
mountPath: /cache
imagePullSecrets:
- name: regcred
volumes:
- name: image-cache
persistentVolumeClaim:
claimName: kaniko-cache-pvc
- name: jenkins-docker-cfg
projected:
sources:
- secret:
name: regcred
items:
- key: .dockerconfigjson
path: config.json
'''
}
}
stages {
stage('Build & Cache Image'){
steps{
container(name: 'kaniko', shell: '/busybox/sh') {
withEnv(['PATH+EXTRA=/busybox']) {
sh '''#!/busybox/sh -xe
/kaniko/executor \
--cache \
--cache-dir=/cache \
--dockerfile Dockerfile \
--context `pwd`/Dockerfile \
--insecure \
--skip-tls-verify \
--destination testrepo/kaniko-test:0.0.1'''
}
}
}
}
}
}
Problem is the executor doesn't dump the cache anywhere I can find. If I rerun the pod and stage, the executor logs say that there's no cache. I want to retain the cache using a PVC as you can see. Any thoughts? Do I miss something?
Thanks in advance.

Answer 1

You should use separate pod kaniko-warmer, which will download you specific images.
- name: kaniko-warmer
image: gcr.io/kaniko-project/warmer:latest
args: ["--cache-dir=/cache",
"--image=nginx:1.17.1-alpine",
"--image=node:17"]
volumeMounts:
- name: kaniko-cache
mountPath: /cache
volumes:
- name: kaniko-cache
hostPath:
path: /opt/volumes/database/qazexam-front-cache
type: DirectoryOrCreate
Then volume kaniko-cache could be mounted to kaniko executor