Jenkins安装与实践

Jenkins是一款由Java编写的开源的持续集成工具。在与Oracle发生争执后，项目从Hudson项目复刻。

Jenkins提供了软件开发的持续集成服务。它运行在Servlet容器中（例如Apache Tomcat）。它支持软件配置管理（SCM）工具（包括AccuRev SCM、CVS、Subversion、Git、Perforce、Clearcase和RTC），可以执行基于Apache Ant和Apache Maven的项目，以及任意的Shell脚本和Windows批处理命令。Jenkins的主要开发者是川口耕介。Jenkins是在MIT许可证下发布的自由软件。

可以通过各种手段触发构建。例如提交给版本控制系统时被触发，也可以通过类似Cron的机制调度，也可以在其他的构建已经完成时，还可以通过一个特定的URL进行请求。

安装Jenkins

安装Jenkins的同时我们部署一个“节点”（slave），后期我们将这个“节点”信息配置在Jenkins中，让Jenkins在进行CI时就在这个“节点”中进行。

场景1：单机docker-compose部署

docker-compose.yml文件

version: '3'
services:
  jenkins:
    restart: always
    image: jenkinsci/jenkins:2.147-alpine
    ports:
    - "8080:8080"
    volumes:
    - ./data/jenkins_home:/var/jenkins_home
  jenkins-slave:
    restart: always
    image: setzero/jenkins-slave:0.1.0
    depends_on:
    - jenkins
    volumes:
    - /var/run/docker.sock:/var/run/docker.sock

启动命令
1
docker-compose up -d

场景2：Kubernetes集群部署

deploy.yml文件

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: jenkins
  name: jenkins
spec:
  replicas: 1
  selector:
    matchLabels:
      app: jenkins
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      containers:
      - image: jenkinsci/jenkins:2.147-alpine
        imagePullPolicy: IfNotPresent
        name: jenkins
        ports:
        - containerPort: 8080
          protocol: TCP
        resources:
          limits:
            memory: 3Gi
          requests:
            memory: 2Gi
        volumeMounts:
        - mountPath: /var/jenkins_home
          name: jenkins
      volumes:
      - emptyDir: {}
        name: jenkins
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: jenkins
  name: jenkins
spec:
  ports:
  - name: http
    port: 8080
    protocol: TCP
    targetPort: 8080
  selector:
    app: jenkins
  type: ClusterIP
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  labels:
    app: jenkins
  name: jenkins
spec:
  rules:
  - host: 1.2.3.4.nip.io
    http:
      paths:
      - backend:
          serviceName: jenkins
          servicePort: 8080
        path: /
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: jenkins-slave
  name: jenkins-slave
spec:
  replicas: 1
  selector:
    matchLabels:
      app: jenkins-slave
  template:
    metadata:
      labels:
        app: jenkins-slave
    spec:
      containers:
      - image: setzero/jenkins-slave:0.1.0
        imagePullPolicy: IfNotPresent
        name: jenkins-slave
        ports:
        - containerPort: 22
          protocol: TCP
        resources:
          limits:
            memory: 2Gi
          requests:
            memory: 1Gi
        volumeMounts:
        - mountPath: /var/run/docker.sock
          name: docker-sock
      volumes:
      - hostPath:
          path: /var/run/docker.sock
        name: docker-sock
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: jenkins-slave
  name: jenkins-slave
spec:
  ports:
  - name: http
    port: 22
    protocol: TCP
    targetPort: 22
  selector:
    app: jenkins-slave
  type: ClusterIP