Installing Jenkins on OVHcloud Managed Kubernetes

Last updated December 20 2021.

In this tutorial we are going to guide you with the install of Jenkins on your OVHcloud Managed Kubernetes Service.

We are going to install Jenkins master and slave cluster utilizing the Jenkins Kubernetes plugin.

Before you begin

This tutorial presupposes that you already have a working OVHcloud Managed Kubernetes cluster, and some basic knowledge of how to operate it. If you want to know more on those topics, please look at the OVHcloud Managed Kubernetes Service Quickstart.

You also need to have Helm installer on your workstation and your cluster, please refer to the How to install Helm on OVHcloud Managed Kubernetes Service tutorial.

Pre-requisites

We (the OVHcloud Managed Kubernetes Service team) are working on a patch to be released in early 2022. In the meantime, please remove the default storage class and install the new one.

• Delete the concerned StorageClass that you are using by default

kubectl delete storageclasses.storage.k8s.io csi-cinder-high-speed

It will delete the existing StorageClass:

$ kubectl delete storageclasses.storage.k8s.io csi-cinder-high-speed
storageclass.storage.k8s.io "csi-cinder-high-speed" deleted

• Create a new StorageClass with the required fix

kubectl apply -f https://raw.githubusercontent.com/ovh/docs/develop/pages/platform/kubernetes-k8s/fix-persistent-volumes-permissions/files/fixed-cinder-high-speed-storage-class.yaml

It will apply the correct StorageClass YAML manifest:

$ kubectl apply -f https://raw.githubusercontent.com/ovh/docs/develop/pages/platform/kubernetes-k8s/fix-persistent-volumes-permissions/files/fixed-cinder-high-speed-storage-class.yaml
storageclass.storage.k8s.io/csi-cinder-high-speed created

Installing the Jenkins Helm chart

For this tutorial we are using the Jenkins Helm chart found on Bitnami Helm repositories.

The chart is fully configurable, but here we are using the default configuration.

helm install my-first-jenkins bitnami/jenkins

This will install your Jenkins master:

$ helm install my-first-jenkins bitnami/jenkins

NAME: my-first-jenkins
LAST DEPLOYED: Mon Dec 20 11:30:59 2021
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
CHART NAME: jenkins
CHART VERSION: 8.0.22
APP VERSION: 2.319.1

** Please be patient while the chart is being deployed **

1. Get the Jenkins URL by running:

** Please ensure an external IP is associated to the my-first-jenkins service before proceeding **
** Watch the status using: kubectl get svc --namespace default -w my-first-jenkins **

  export SERVICE_IP=$(kubectl get svc --namespace default my-first-jenkins --template "{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}")
  echo "Jenkins URL: http://$SERVICE_IP/"

2. Login with the following credentials

  echo Username: user
  echo Password: $(kubectl get secret --namespace default my-first-jenkins -o jsonpath="{.data.jenkins-password}" | base64 --decode)

As the instructions say, you will need to wait a few moments to get the LoadBalancer URL. You can test if the LoadBalancer is ready using:

kubectl get svc --namespace default -w my-first-jenkins

After some minutes, you will get the LoadBalancer URL:

$ kubectl get svc --namespace default -w my-first-jenkins

NAME               TYPE           CLUSTER-IP   EXTERNAL-IP   PORT(S)                      AGE
my-first-jenkins   LoadBalancer   10.3.3.52         80:32193/TCP,443:32260/TCP   49s
my-first-jenkins   LoadBalancer   10.3.3.52    152.228.169.118   80:32193/TCP,443:32260/TCP   54s

The URL under EXTERNAL-IP is your Jenkins URL. You can the follow the instructions on the Helm Chart to get the connection parameters. In my case:

$ export SERVICE_IP=$(kubectl get svc --namespace default my-first-jenkins --template "{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}")

$ echo "Jenkins URL: http://$SERVICE_IP/"
Jenkins URL: http://152.228.169.118/

$ echo Username: user
Username: user

$ echo Password: $(kubectl get secret --namespace default my-first-jenkins -o jsonpath="{.data.jenkins-password}" | base64 --decode)
Password: KMhUs53TJT

And putting the URL in your browser will take you to the new Jenkins:

Log in with user admin and the password you got before. And here you have your Jenkins:

You have a working Jenkins on your OVHcloud Managed Kubernetes Service, congratulations!

Cleaning up

To clean up your cluster, simply use Helm to delete your Jenkins release.

helm delete my-first-jenkins

It will delete your Jenkins and its associated resources from your cluster:

$ helm delete my-first-jenkins
release "my-first-jenkins" uninstalled

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