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README.md
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README.md

First lets create namespace with name jenkins

kubectl create ns jenkins

Now lets set namespace to jenkins by below command

kubectl config view | grep namespace
kubectl config set-context --current --namespace=jenkins

Then apply deploymet and service which are present in master folder, if you want persistent jenkins use files present in master-Persistent

kubectl apply -f .

check jenkins-master pod is up and running or not

NAME                                            READY   STATUS    RESTARTS   AGE   IP            NODE          NOMINATED NODE   READINESS GATES
pod/jenkins-master-deployment-b8cf57cdc-4cxhk   1/1     Running   0          12m   10.244.1.20   kube-node-1   <none>           <none>

NAME                             TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)                        AGE   SELECTOR
service/jenkins-master-service   NodePort   10.96.78.113   <none>        80:32147/TCP,50000:30930/TCP   12m   app=jenkins-master,group=jenkins,version=latest

NAME                                        READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS       IMAGES                              SELECTOR
deployment.apps/jenkins-master-deployment   1/1     1            1           12m   jenkins-master   deekshithsn/jenkinskubernetes:4.0   app=jenkins-master,group=jenkins,version=latest

NAME                                                  DESIRED   CURRENT   READY   AGE   CONTAINERS       IMAGES                              SELECTOR
replicaset.apps/jenkins-master-deployment-b8cf57cdc   1         1         1       12m   jenkins-master   deekshithsn/jenkinskubernetes:4.0   app=jenkins-master,group=jenkins,pod-template-hash=b8cf57cdc,version=latest

as you can see jenkins-master pod is running on kube-node-1 so to access jenkins get node ip and service port in my case it is 32147

http://kube-node-1_ip:service_port

Once after jenkins up and running, navigate to Manage Jenkins --> Configure System ( make sure usage set to "only build jobs with label expresions matching this node" ) --> cloud

  • In Configure cloud page select kubernetes

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  • Configure Kubernetes details and Pod templates by clicking on each one of them

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  • get kubernetes url by running kubectl cluster-info get url and click on test connection. after clicking on it, you should see Connected Kubernetes

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if you face any problem in this step checkout https://issues.jenkins.io/browse/JENKINS-55788 or https://stackoverflow.com/questions/47973570/kubernetes-log-user-systemserviceaccountdefaultdefault-cannot-get-services

  • Next get service url and provide the same in jenkins. Save it

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  • Next configure pod template and container details as show in below picture

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  • Once this is done, now create new free style job and in build step give whatever th command you want to run

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  • Once job is created, click on build now. then you will be able to see in manage nodes a slave will be created and job will be running on that

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