How to adjust ContainerTemplate in Jenkinsfile to get Images from private registry - docker

Question

I want to get a Docker-Image from my private-docker-registry. I can not find a good solution to describe a authentication in the Jenkinsfile. What do I need to add in the Jenkinsfile to get my Image "my-private-registry.image-name:tag"?
pipeline {
agent {
kubernetes {
label "${jenkins_slave_id}"
defaultContainer 'jnlp'
serviceAccount 'jenkins'
yaml """
apiVersion: v1
kind: Pod
spec:
restartPolicy: Never
containers:
- name: "my-private-container"
image: "my-private-registry.image-name:tag"
tty: true
command:
- cat
volumeMounts:
- name: docker-socket
mountPath: /var/run/docker.sock
- name: "jnlp"
stages {
stage("Do something") {
steps {
script {
container('my-private-container') {
script {
//Do something
}
}
}
}
}

Answer 1

Yes, I have added my imagePullSecret like this:
- name: "my-private-container"
image: "my-private-registry.image-name:tag"
imagePullSecrets: ['Docker-Registry']
tty: true
command:
- cat
volumeMounts:
- name: docker-socket
mountPath: /var/run/docker.sock
I configured my imagePullSecrets in the secrets as "Username and Password".
When I try to run it I get following message:
Failed to pull image "my-private-registry.image-name:tag": unknown: Authentication is required

Answer 2

All you need to create cluster object secret with your private registry credentials and then add the secret name in your Pod template as below:
kubectl create secret docker-registry regcred
--docker-server=YOUR-PRIVATE-REGISTRY --docker-username=USER --docker-password=PASSWORD
pipeline {
agent {
kubernetes {
label "${jenkins_slave_id}"
defaultContainer 'jnlp'
serviceAccount 'jenkins'
yaml """
apiVersion: v1
kind: Pod
spec:
imagePullSecrets:
- name: regcred
restartPolicy: Never
containers:
- name: "my-private-container"
image: "my-private-registry.image-name:tag"
tty: true
command:
- cat
volumeMounts:
- name: docker-socket
mountPath: /var/run/docker.sock
- name: "jnlp"