Kubernetes安裝Jenkins的思路詳解-魔扣目錄

環境

生產實踐-k8s安裝Jenkins和Jenkins Kubernetes插件
環境要求：你需要一個正常可以使用的Kubernetes集群，集群中可以使用的內存大于等于4G。
Kubernetes版本1.18

思路

Jenkins插件可以在Kubernetes集群中運行動態jenkins-slave代理。

基于Kubernetes的docker，自動化在Kubernetes中運行的Jenkins-slave代理的縮放。

該插件為每個jenkins-slave代理創建Kubernetes Pod，并在每個構建后停止它。

在Kubernetes中jenkins-slave代理啟動，會自動連接到Jenkins主控制器。對于某些環境變量，會自動注入：

Jenkins_URL：Jenkins Web界面URL
jenkins_secret：身份驗證的秘密密鑰
jenkins_agent_name：jenkins代理的名稱
jenkins_name：jenkins代理的名稱（已棄用。僅用于向后兼容性）
不需要在Kubernetes內運行Jenkins Controller。

1、NFS（動態存儲）

#安裝
yum install -y nfs-utils rpcbind
mkdir -p /data/nfsdata
 
# 修改配置
$ vim /etc/exports
/data/nfsdata 192.168.31.* (rw,async,no_root_squash)
 
# 使配置生效
$ exportfs -r
 
# 服務端查看下是否生效
$ showmount -e localhost
 
Export list for localhost:
/data/nfsdata (everyone)

2、helm安裝nfs-client

stable       	https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts
helm添加這個源

下載helm包
helm pull aliyuncs/nfs-client-provisioner
解壓
tar -zxvf nfs-client-provisioner-1.2.8.tgz
修復values.yaml 三處
image:
  repository: quay.io/external_storage/nfs-client-provisioner
  tag: v3.1.0-k8s1.11
  pullPolicy: IfNotPresent
nfs:
  server: 192.168.31.73
  path: /data/nfsdata
  reclaimPolicy: Retain

Kubernetes安裝Jenkins的思路詳解

3、創建namespace

kubectl create namespace jenkins
kubectl get namespaces

4、持久化Jenkins數據

pvc.yaml

 apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: jenkins-pvc
  namespace: jenkins
spec:
  storageClassName: "nfsdata"
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 10Gi

通過kubectl部署volume

kubectl apply -f pvc.yaml

5、創建service account

創建pod時，如果不指定服務賬戶，則會自動為其分配一個名為default的同一namespace中的服務賬戶。但是通常應用程序時存在權限不足的情況，所以需要我們自己創建一個服務賬戶。
①下載jenkins-sa.yaml

wget https://raw.githubusercontent.com/jenkins-infra/jenkins.io/master/content/doc/tutorials/kubernetes/installing-jenkins-on-kubernetes/jenkins-sa.yaml

②通過kubectl部署jenkins-sa.yaml

kubectl apply -f jenkins-sa.yaml

或者使用下面的文件

jenkins-sa.yaml

 
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: jenkins
  namespace: jenkins
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: jenkins
rules:
- apiGroups:
  - '*'
  resources:
  - statefulsets
  - services
  - replicationcontrollers
  - replicasets
  - podtemplates
  - podsecuritypolicies
  - pods
  - pods/log
  - pods/exec
  - podpreset
  - poddisruptionbudget
  - persistentvolumes
  - persistentvolumeclaims
  - jobs
  - endpoints
  - deployments
  - deployments/scale
  - daemonsets
  - cronjobs
  - configmaps
  - namespaces
  - events
  - secrets
  verbs:
  - create
  - get
  - watch
  - delete
  - list
  - patch
  - update
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - get
  - list
  - watch
  - update
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: jenkins
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: jenkins
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:serviceaccounts:jenkins

6、安裝Jenkins

jenkins-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: jenkins
  namespace: jenkins
spec:
  replicas: 1
  selector:
    matchLabels:
      app: jenkins
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      serviceAccountName: jenkins   #指定我們前面創建的服務賬號
      containers:
      - name: jenkins
        image: registry.cn-hangzhou.aliyuncs.com/s-ops/jenkins:2.346
        ports:
        - containerPort: 8080
        - containerPort: 50000
        volumeMounts:
        - name: jenkins-home
          mountPath: /var/jenkins_home
      volumes:
      - name: jenkins-home
        persistentVolumeClaim:
          claimName: jenkins-pvc     #指定前面創建的PVC

通過kubectl部署jenkins-deployment.yaml

kubectl create -f jenkins-deployment.yaml -n jenkins

7、授權對Jenkins服務的訪問權限

主要目的暴露外部訪問Jenkins的8080端口，我將31400定義為8080的映射端口。

jenkins-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: jenkins
  namespace: jenkins
spec:
  type: NodePort
  ports:
  - name: http
    port: 8080
    targetPort: 8080
    nodePort: 31400
  - name: agent
    port: 50000
    targetPort: 50000
    nodePort: 31401
  selector:
    app: jenkins

通過kubectl部署服務

kubectl create -f jenkins-service.yaml -n jenkins

8、打開瀏覽器IP:31400/

查看密碼

kubectl get pod -n jenkins  //查詢podname
kubectl logs podname -n jenkins
 
*************************************************************
 
Jenkins initial setup is required. An admin user has been created and a password generated.
Please use the following password to proceed to installation:
 
cf8d9da9de0346fd90461be366915d76
 
This may also be found at: /var/jenkins_home/secrets/initialAdminPassword
 
*************************************************************

選擇推薦插件安裝，創建管理員~完成！

Kubernetes安裝Jenkins的思路詳解