Jenkins on Kubernetes using Minikube

• Setup
• Jenkins Configure Cloud
  • Configure the Jenkins Controller
  • Create a Cloud Configuration on the Jenkins Controller
• Jenkins Data

Setup

1. Create a minikube profile

# create
minikube start -p jenkins-minikube

# set as default profile
minikube profile jenkins-minikube

Optionally minikube start -p minikube-jenkins --memory 8192 --cpus 2

2. Create a namespace

kubectl create namespace jenkins
kubens jenkins

3. Deploy Kubernetes manifests

kubectl apply -f ./kubernetes

4. Navigate to jenkins using the minikube IP and service port

# minikube ip 
minikube profile list

|------------------|-----------|---------|--------------|------|---------|---------|-------|
|     Profile      | VM Driver | Runtime |      IP      | Port | Version | Status  | Nodes |
|------------------|-----------|---------|--------------|------|---------|---------|-------|
| minikube         | hyperkit  | docker  | 112.132.61.2 | 8443 | v1.23.3 | Running |     1 |
| minikube-jenkins | hyperkit  | docker  | 181.134.24.7 | 8443 | v1.23.3 | Running |     1 |
|------------------|-----------|---------|--------------|------|---------|---------|-------|

# service port 
kubectl get service

NAME      TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)                                       AGE
jenkins   NodePort   10.108.176.124   <none>        8080:30408/TCP,50000:30707/TCP,80:30962/TCP   34m

# Navigate to 
http://192.168.64.7:30408

Jenkins Configure Cloud

Configure the Jenkins Controller

You'll first need to create a credential set for the Jenkins controller to access the Minikube Kubernetes cluster. To do this, perform the following steps:

1. In the Jenkins UI, click the Credentials link in the left-hand navigation pane
2. Click the arrow next to (global) in the Stores scoped to Jenkins table (you have to hover next to the link to see the arrow)
3. Click Add Credentials
4. Under Kind, specify Kubernetes Service Account
5. Leave the scope set to Global
6. Click OK.

Create a Cloud Configuration on the Jenkins Controller

The next step is to create a cloud configuration for the minikube kubernetes cluster.

1. In the Jenkins UI, go to Manage Jenkins → Manage Nodes and Clouds
2. The following parameters must be set:
   • Name: - This defaults to kubernetes.
   • Kubernetes URL: https://kubernetes.default - This was automatically configured from the service account.
   • Kubernetes Namespace: jenkins.
   • Credentials: ~/.kube/config → Select the Kubernetes Service Account credentials you created in the previous step.
   • Jenkins URL: http://<minikube-ip>:<service-port> → http://192.168.64.7:30408.
   • Jenkins tunnel: <pod-ip>:<service-port> → 10.108.176.124:50000 - This is the port that is used to communicate with an agent.

Jenkins Data

The Jenkins data is stored in the minikube node, and can be accessed with SSH