K
Q

Is there a way to update Jenkins running in Kubernetes?

4/28/2020

I'm trying to run Jenkins in Kubernetes but the version of Jenkins is outdated. It says I need atleast version 2.138.4 for the Kubernetes plugin.

Im using this jenkins image from Docker hub ("jenkins/jenkins:lts"). But when I try to run this in Kubernetes it says the version is 2.60.3. I previously used a really old version of Jenkins (2.60.3) but I updated my Dockerfile to use the latest image. After that I build the image again and threw it to Kubernetes. I even delete my Kubernetes Deployment and Service before deploying them again. I'm currently working in a development environment using Minikube.

Dockerfile:

FROM jenkins/jenkins:lts

ENV JENKINS_USER admin
ENV JENKINS_PASS admin

# Skip initial setup
ENV JAVA_OPTS -Djenkins.install.runSetupWizard=false


COPY plugins.txt /usr/share/jenkins/plugins.txt
RUN /usr/local/bin/install-plugins.sh < /usr/share/jenkins/plugins.txt
USER root
RUN apt-get update \
  && apt-get install -qqy apt-transport-https ca-certificates curl gnupg2 software-properties-common 
RUN curl -fsSL https://download.docker.com/linux/debian/gpg | apt-key add -
RUN add-apt-repository \
  "deb [arch=amd64] https://download.docker.com/linux/debian \
  $(lsb_release -cs) \
  stable"
RUN apt-get update  -qq \
  && apt-get install docker-ce -y
RUN usermod -aG docker jenkins
RUN apt-get clean
RUN curl -L "https://github.com/docker/compose/releases/download/1.24.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose && chmod +x /usr/local/bin/docker-compose
USER jenkins

The Kubernetes deployment:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: jenkins
spec:
  replicas: 1
  selector:
    matchLabels:
      app: jenkins
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      containers:
        - name: jenkins
          image: mikemanders/my-jenkins-image:1.0
          env:
            - name: JAVA_OPTS
              value: -Djenkins.install.runSetupWizard=false
          ports:
            - name: http-port
              containerPort: 8080
            - name: jnlp-port
              containerPort: 50000
          volumeMounts:
            - name: jenkins-home
              mountPath: /var/jenkins_home
      volumes:
        - name: jenkins-home
          emptyDir: {}

And the Kubernetes Service:

apiVersion: v1
kind: Service
metadata:
  name: jenkins
spec:
  type: NodePort
  selector:
    app: jenkins
  ports:
    - port: 8080
      targetPort: 8080

I think my Kubernetes configuration are good, so I'm guessing it has something to do with Docker?

What am I missing/doing wrong here?

-- Mike Manders
docker
dockerfile
jenkins
jenkins-plugins
kubernetes

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1 Answer

4/28/2020

TL;DR

To update a deployment, you need new Docker image based on the new Jenkins release:

docker build -t mikemanders/my-jenkins-image:1.1 .
docker push mikemanders/my-jenkins-image
kubectl set image deployment/jenkins mikemanders/my-jenkins-image=1.1 --record

Kubernetes deploys images not dockerfiles

As per Images man

You create your Docker image and push it to a registry before referring to it in a Kubernetes pod.

The image property of a container supports the same syntax as the docker command does, including private registries and tags.

So, you need an image to deploy.

Update your image

To update your image in registry, use docker build -t and docker push:

docker build -t mikemanders/my-jenkins-image:1.1
docker push mikemanders/my-jenkins-image

It will rebuild the image with updated jenkins/jeinkis:lts. Then image will be uploaded to the container registry.

The catch is that you are updating the image version (e.g. 1.0->1.1) before updating the cluster.

-- Yasen
Source: StackOverflow