使用jenkins动态slave的优势：
- 服务高可用，当 Jenkins Master 出现故障时，Kubernetes 会自动创建一个新的 Jenkins Master 容器，并且将 Volume 分配给新创建的容器，保证数据不丢失，从而达到集群服务高可用。
- 动态伸缩，合理使用资源，每次运行 Job 时，会自动创建一个 Jenkins Slave，Job 完成后，Slave 自动注销并删除容器，资源自动释放，而且 Kubernetes 会根据每个资源的使用情况，动态分配 Slave 到空闲的节点上创建，降低出现因某节点资源利用率高，还排队等待在该节点的情况。
- 扩展性好，当 Kubernetes 集群的资源严重不足而导致 Job 排队等待时，可以很容易的添加一个 Kubernetes Node 到集群中，从而实现扩展。
架构图如下：
1、创建namespace
kubectl create ns kube-ops
2、设置rba授权
[root@node1 mingyang]# cat rbac.yaml apiVersion: v1 kind: ServiceAccount metadata: name: jenkins namespace: kube-ops --- kind: ClusterRole apiVersion: rbac.authorization.k8s.io/v1beta1 metadata: name: jenkins rules: - apiGroups: ["extensions", "apps"] resources: ["deployments"] verbs: ["create", "delete", "get", "list", "watch", "patch", "update"] - apiGroups: [""] resources: ["services"] verbs: ["create", "delete", "get", "list", "watch", "patch", "update"] - apiGroups: [""] resources: ["pods"] verbs: ["create","delete","get","list","patch","update","watch"] - apiGroups: [""] resources: ["pods/exec"] verbs: ["create","delete","get","list","patch","update","watch"] - apiGroups: [""] resources: ["pods/log"] verbs: ["get","list","watch"] - apiGroups: [""] resources: ["secrets"] verbs: ["get"] --- apiVersion: rbac.authorization.k8s.io/v1beta1 kind: ClusterRoleBinding metadata: name: jenkins namespace: kube-ops roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: jenkins subjects: - kind: ServiceAccount name: jenkins namespace: kube-ops
3、创建jenkins deployment文件
[root@node1 mingyang]# cat jenkins.yaml --- apiVersion: apps/v1 kind: Deployment metadata: name: jenkins namespace: kube-ops spec: selector: matchLabels: app: jenkins template: metadata: labels: app: jenkins spec: terminationGracePeriodSeconds: 10 serviceAccount: jenkins containers: - name: jenkins image: jenkins/jenkins:lts imagePullPolicy: IfNotPresent ports: - containerPort: 8080 name: web protocol: TCP - containerPort: 50000 name: agent protocol: TCP resources: limits: cpu: 1000m memory: 1Gi requests: cpu: 500m memory: 512Mi livenessProbe: httpGet: path: /login port: 8080 initialDelaySeconds: 60 timeoutSeconds: 5 failureThreshold: 12 readinessProbe: httpGet: path: /login port: 8080 initialDelaySeconds: 60 timeoutSeconds: 5 failureThreshold: 12 volumeMounts: - name: jenkinshome subPath: jenkins mountPath: /var/jenkins_home env: - name: LIMITS_MEMORY valueFrom: resourceFieldRef: resource: limits.memory divisor: 1Mi - name: JAVA_OPTS value: -Xmx$(LIMITS_MEMORY)m -XshowSettings:vm -Dhudson.slaves.NodeProvisioner.initialDelay=0 -Dhudson.slaves.NodeProvisioner.MARGIN=50 -Dhudson.slaves.NodeProvisioner.MARGIN0=0.85 -Duser.timezone=Asia/Shanghai securityContext: fsGroup: 1000 volumes: - name: jenkinshome hostPath: path: /data/jenkins_home type: DirectoryOrCreate --- apiVersion: v1 kind: Service metadata: name: jenkins namespace: kube-ops labels: app: jenkins spec: selector: app: jenkins type: NodePort ports: - name: web port: 8080 targetPort: web nodePort: 30002 - name: agent port: 50000 targetPort: agent
4、给jenkins家目录授权
chown -R 1000 /data/jenkins_home/
5、运行情况
6、安装kubernetes插件Kubernetes plugin。
7、配置kubernetes
8、这一步是核心，添加pod templates。标签列表是到时编写pipeline要关联的。
9、添加两个挂载卷 分别是docker及kubectl 工具
10、测试pipeline
node(‘hejianlai‘) { stage(‘Clone‘) { echo "1.Clone Stage" } stage(‘Test‘) { echo "2.Test Stage" } stage(‘Build‘) { echo "3.Build Docker Image Stage" } stage(‘Push‘) { echo "4.Push Docker Image Stage" } stage(‘YAML‘) { echo "5. Change YAML File Stage" } stage(‘Deploy‘) { echo "6. Deploy Stage" } }
11、运行结果，slave执行完任务之后自动销毁。