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시스템/쿠버네티스

[쿠버네티스] k8s 젠킨스 설치

by cbwstar 2024. 1. 9.
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/* 쿠버네티스에 젠킨스 설치시 영구 저장을 위해서 스토리지를 생성한다. */

참고 : https://kubernetes.io/ko/docs/concepts/storage/storage-classes/#nfs

 

스토리지 클래스

이 문서는 쿠버네티스의 스토리지클래스의 개념을 설명한다. 볼륨과 퍼시스턴트 볼륨에 익숙해지는 것을 권장한다. 소개 스토리지클래스는 관리자가 제공하는 스토리지의 "classes"를 설명할 수

kubernetes.io

1. StorageClass 생성

    vi storageClass-local-storage.yaml  

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer

  1) 스토리지 클래스 생성 

root@master:~/jenkins# kubectl apply -f ./storageClass-local-storage.yaml
storageclass.storage.k8s.io/local-storage created

   2) Persistent Volume 생성

root@node1:~# mkdir -p /kubernetes/data/pv/jenkins
root@node1:~# chmod 777 /kubernetes/data/pv/jenkins

  3) pv 생성

   vi pv-jenkins.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-jenkins
spec:
  capacity:
    storage: 30Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-storage
  local:
    path: /kubernetes/data/pv/jenkins
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: In
              values:
                - node1

30GB 의 용량으로 설정하고 하나의 pod 만 접근하기 때문에 ReadWriteOnce, pod 가 삭제되더라도 데이터 보존을 위해 Retain 전략으로 설정합니다. NodeAffinity 설정을 통해 node1 에 pv 를 생성하도록 합니다. 즉, Jenkins pv 는 node1 노드에 만들어지고 Jenkins pod 역시 node1노드에 생성되게 됩니다.

 

4) jenkins 네임스페이스 생성

$ kubectl create namespace jenkins

$ kubectl apply -f ./pv-jenkins.yaml -n jenkins
persistentvolume/pv-jenkins created

 

5) Persistnet Volume Claim 생성

$ vi pvc-jenkins.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pvc-jenkins
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: local-storage
  resources:
    requests:
      storage: 30Gi

위에서 생성한 local-storage 타입으로 30기가 용량의 pvc를 생성합니다.

root@master:~/jenkins# kubectl apply -f ./pvc-jenkins.yaml -n jenkins
persistentvolumeclaim/pvc-jenkins created

6) pv 상태 조회

$ kubectl get pv

root@master:~/jenkins# kubectl get pv
NAME         CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS    VOLUMEATTRIBUTESCLASS   REASON   AGE
pv-jenkins   30Gi       RWO            Retain           Available           local-storage   <unset>                          5m24s

/* VolumeBindingMode 를 WaitForFirstConsumer로 설정했기 때문에 Status 가 아직 Available 인 점을 확인할 수 있습니다. */

7) pvc 상태 조회

$ kubectl get pvc pvc-jenkins -n jenkins

root@master:~/jenkins# kubectl get pvc pvc-jenkins -n jenkins
NAME          STATUS    VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS    VOLUMEATTRIBUTESCLASS   AGE
pvc-jenkins   Pending                                      local-storage   <unset>                 3m33s

/* 상태가 pending 입니다. */

 

2.  Jenkins 설치

  1) Deployment 생성

$ vi deployment-jenkins.yaml

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: jenkins/jenkins:lts
        imagePullPolicy: "IfNotPresent"
        securityContext:
#root 권한        
          runAsUser: 0
        ports:
          - name: http-port
            containerPort: 8080
          - name: jnlp-port
            containerPort: 50000
        volumeMounts:
          - name: jenkins-home
            mountPath: /var/jenkins_home
          - name: docker-socket
            mountPath: /var/run/docker.sock
          - name: docker-binary
            mountPath: /usr/bin/docker
      volumes:
        - name: jenkins-home
          persistentVolumeClaim:
            claimName: pvc-jenkins
        - name: docker-socket
          hostPath:
            path: /var/run/docker.sock
        - name: docker-binary
          hostPath:
            path: /usr/bin/docker

  

$ kubectl apply -f ./deployment-jenkins.yaml -n jenkins

  2) pod 상태 확인

root@master:~/jenkins# kubectl get pods -n jenkins -o wide
NAME                      READY   STATUS    RESTARTS   AGE    IP             NODE    NOMINATED NODE   READINESS GATES
jenkins-8d76965bc-wbw28   1/1     Running   0          107s   10.1.166.142   node1   <none>           <none>

 3) node1에만 생성되는지 삭제 테스트

kubectl delete pods jenkins-8d76965bc-wbw28 -n jenkins

 

  4) 젠킨스를 외부에 노출하기 위한 서비스 NodePort 생성

vi service-jenkins.yaml

apiVersion: v1
kind: Service
metadata:
  name: jenkins
spec:
  type: NodePort
  ports:
    - port: 8080
      targetPort: 8080
      nodePort: 30000
  selector:
    app: jenkins

---

apiVersion: v1
kind: Service
metadata:
  name: jenkins-jnlp
spec:
  type: NodePort
  ports:
    - port: 50000
      targetPort: 50000
      nodePort: 30001
  selector:
    app: jenkins

  5) 서비스 생성

kubectl apply -f ./service-jenkins.yaml -n jenkins

  6) 서비스 기동 확인

root@master:~/jenkins# kubectl get services -n jenkins
NAME           TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)           AGE
jenkins        NodePort   10.106.63.3      <none>        8080:30000/TCP    19s
jenkins-jnlp   NodePort   10.105.220.170   <none>        50000:30001/TCP   18s

  7) 포드 네임 확인후 로그에서 관리자 패스워드 확인

root@master:~/jenkins# kubectl get pods -n jenkins 
NAME                      READY   STATUS    RESTARTS   AGE
jenkins-97fb8547b-tvnnh   1/1     Running   0          5m51s

/* 로그에서 관리자 패스워드 확인 */
root@master:~/jenkins# kubectl logs jenkins-97fb8547b-tvnnh -n jenkins
Running from: /usr/share/jenkins/jenkins.war
webroot: /var/jenkins_home/war
2024-01-08 23:47:41.719+0000 [id=1]	INFO	winstone.Logger#logInternal: Beginning extraction from war file
2024-01-08 23:47:43.414+0000 [id=1]	WARNING	o.e.j.s.handler.ContextHandler#setContextPath: Empty contextPath
2024-01-08 23:47:43.476+0000 [id=1]	INFO	org.eclipse.jetty.server.Server#doStart: jetty-10.0.18; built: 2023-10-27T01:59:58.245Z; git: 8545fd9bf4cd0d0838f626b405fd4963441546b7; jvm 17.0.9+9
2024-01-08 23:47:43.802+0000 [id=1]	INFO	o.e.j.w.StandardDescriptorProcessor#visitServlet: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
2024-01-08 23:47:43.850+0000 [id=1]	INFO	o.e.j.s.s.DefaultSessionIdManager#doStart: Session workerName=node0
2024-01-08 23:47:44.392+0000 [id=1]	INFO	hudson.WebAppMain#contextInitialized: Jenkins home directory: /var/jenkins_home found at: EnvVars.masterEnvVars.get("JENKINS_HOME")
2024-01-08 23:47:44.500+0000 [id=1]	INFO	o.e.j.s.handler.ContextHandler#doStart: Started w.@6778aea6{Jenkins v2.426.2,/,file:///var/jenkins_home/war/,AVAILABLE}{/var/jenkins_home/war}
2024-01-08 23:47:44.510+0000 [id=1]	INFO	o.e.j.server.AbstractConnector#doStart: Started ServerConnector@6955cb39{HTTP/1.1, (http/1.1)}{0.0.0.0:8080}
2024-01-08 23:47:44.521+0000 [id=1]	INFO	org.eclipse.jetty.server.Server#doStart: Started Server@7c098bb3{STARTING}[10.0.18,sto=0] @3529ms
2024-01-08 23:47:44.543+0000 [id=25]	INFO	winstone.Logger#logInternal: Winstone Servlet Engine running: controlPort=disabled
2024-01-08 23:47:44.756+0000 [id=33]	INFO	jenkins.InitReactorRunner$1#onAttained: Started initialization
2024-01-08 23:47:44.765+0000 [id=32]	INFO	jenkins.InitReactorRunner$1#onAttained: Listed all plugins
2024-01-08 23:47:45.655+0000 [id=36]	INFO	jenkins.InitReactorRunner$1#onAttained: Prepared all plugins
2024-01-08 23:47:45.658+0000 [id=36]	INFO	jenkins.InitReactorRunner$1#onAttained: Started all plugins
2024-01-08 23:47:45.665+0000 [id=35]	INFO	jenkins.InitReactorRunner$1#onAttained: Augmented all extensions
2024-01-08 23:47:46.171+0000 [id=31]	INFO	jenkins.InitReactorRunner$1#onAttained: System config loaded
2024-01-08 23:47:46.172+0000 [id=31]	INFO	jenkins.InitReactorRunner$1#onAttained: System config adapted
2024-01-08 23:47:46.172+0000 [id=36]	INFO	jenkins.InitReactorRunner$1#onAttained: Loaded all jobs
2024-01-08 23:47:46.174+0000 [id=36]	INFO	jenkins.InitReactorRunner$1#onAttained: Configuration for all jobs updated
2024-01-08 23:47:46.218+0000 [id=49]	INFO	hudson.util.Retrier#start: Attempt #1 to do the action check updates server
2024-01-08 23:47:46.599+0000 [id=34]	INFO	jenkins.install.SetupWizard#init: 

*************************************************************
*************************************************************
*************************************************************

Jenkins initial setup is required. An admin user has been created and a password generated.
Please use the following password to proceed to installation:

4adb6c4d31034b9382ff8d514071bc80

This may also be found at: /var/jenkins_home/secrets/initialAdminPassword

*************************************************************
*************************************************************
*************************************************************

2024-01-08 23:48:04.365+0000 [id=33]	INFO	jenkins.InitReactorRunner$1#onAttained: Completed initialization
2024-01-08 23:48:04.380+0000 [id=24]	INFO	hudson.lifecycle.Lifecycle#onReady: Jenkins is fully up and running
2024-01-08 23:48:05.423+0000 [id=49]	INFO	h.m.DownloadService$Downloadable#load: Obtained the updated data file for hudson.tasks.Maven.MavenInstaller
2024-01-08 23:48:05.423+0000 [id=49]	INFO	hudson.util.Retrier#start: Performed the action check updates server successfully at the attempt #1

  8) 젠킨스 내부 접속 아이피 확인

kubectl get nodes -o wide

root@master:~/jenkins# kubectl get nodes -o wide
NAME     STATUS   ROLES           AGE    VERSION   INTERNAL-IP   EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION      CONTAINER-RUNTIME
master   Ready    control-plane   3d1h   v1.29.0   10.0.100.2    <none>        Ubuntu 22.04.3 LTS   5.15.0-91-generic   containerd://1.7.2
node1    Ready    <none>          3d     v1.29.0   10.0.100.3    <none>        Ubuntu 22.04.3 LTS   5.15.0-91-generic   containerd://1.7.2
node2    Ready    <none>          3d     v1.29.0   10.0.100.4    <none>        Ubuntu 22.04.3 LTS   5.15.0-91-generic   containerd://1.7.2
node3    Ready    <none>          3d     v1.29.0   10.0.100.5    <none>        Ubuntu 22.04.3 LTS   5.15.0-91-generic   containerd://1.7.2

/* 마스터 또는 노드 아이피로 젠킨스 서버에 접속 되는지 확인 */
/* 외부 접속 노드 포트 확인 */
root@master:~/jenkins# kubectl get service -n jenkins 
NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
jenkins        NodePort    10.104.2.121    <none>        8080:30000/TCP   8m27s
jenkins-jnlp   ClusterIP   10.106.228.75   <none>        50000/TCP        8m27s

/* 외부 접속 노드 포트 : 30000 */
/* 내부 접속 확인 */
$ curl http://10.0.100.2:30000

root@master:~/jenkins# curl http://10.0.100.2:30000
<html><head><meta http-equiv='refresh' content='1;url=/login?from=%2F'/><script>window.location.replace('/login?from=%2F');</script></head><body style='background-color:white; color:white;'>


Authentication required
<!--
-->

</body></html>                                                                                                                                                                                                                                                                                                            root@master:~/jenkins# curl http://10.0.100.3:30000
<html><head><meta http-equiv='refresh' content='1;url=/login?from=%2F'/><script>window.location.replace('/login?from=%2F');</script></head><body style='background-color:white; color:white;'>


Authentication required
<!--
-->

</body></html>                                                                                                                                                                                                                                                                                                            root@master:~/jenkins# curl http://10.0.100.4:30000
<html><head><meta http-equiv='refresh' content='1;url=/login?from=%2F'/><script>window.location.replace('/login?from=%2F');</script></head><body style='background-color:white; color:white;'>


Authentication required
<!--
-->

</body></html>                                                                                                                                                                                                                                                                                                            root@master:~/jenkins# curl http://10.0.100.5:30000
<html><head><meta http-equiv='refresh' content='1;url=/login?from=%2F'/><script>window.location.replace('/login?from=%2F');</script></head><body style='background-color:white; color:white;'>


Authentication required
<!--
-->

</body></html>                                                                                                                                                                                                                                                                                                            root@master:~/jenkins# 

/* 모든 노드 접속 확인 이상없으면 외부 포트 포트 포워딩하여 접속할수 있게 vm 포트 포워딩 추가 */

  9) vm 포트 포워딩 추가

10) 브라우저에서 접속되는지 확인

  http://192.168.2.50:30000

11) 샘플 파이프 라인 테스트

 

저장 버튼을 클릭하고 저장한다.

 

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