Jenkins K8S Docker 一键部署SpringCloud微服务

前言

一键部署springcloud微服务，需要用到 Jenkins K8S Docker等工具，若未安装，请参考《Centos 7 安装K8S》

本文使用jenkins部署，流程如下图

1. 开发者将代码push到git
2. 运维人员通过jenkins部署，自动到git上pull代码
3. 通过maven构建代码
4. 将maven构建后的jar打包成docker镜像 并 push docker镜像到docker registry
5. 通过k8s发起 发布/更新 服务 操作

其中 2~5步骤都会在jenkins中进行操作

1、开发者将代码PUSH到Git

这一步本文不做详细描述

2、通过Jenkins部署，自动到Git上PULL代码

这里需要用到Jenkins 的 pipeline插件

2.1、 配置SSH-KEY

因为jenkins需要pull git上的代码，正常来说，代码都是私有的，git clone操作的时候会需要密码，就不能完成自动化操作了。这里使用SSH-KEY 的方式，让git clone操作无需密码就能完成克隆

2.1.1、生成/添加SSH公钥

在jenkins所在环境里执行

ssh-keygen -t ed25519 -C "xxxxx@xxxxx.com"  

注意：这里的 xxxxx@xxxxx.com 只是生成的 sshkey 的名称，并不约束或要求具体命名为某个邮箱
现网的大部分教程均讲解的使用邮箱生成，其一开始的初衷仅仅是为了便于辨识所以使用了邮箱

按照提示完成三次回车，即可生成 ssh key。通过查看 ~/.ssh/id_ed25519.pub 文件内容，获取到你的 public key

得到公钥 public key 内容

cat ~/.ssh/id_ed25519.pub

复制备用

2.1.2、将公钥配置到git平台

git平台可以是github，gitee，也可以是自己搭建的gitlab等
我这里使用gitee
通过仓库主页 「管理」->「部署公钥管理」->「添加部署公钥」 ，添加生成的 public key 添加到仓库中。

添加成功后，到jenkins所在环境运行

ssh -T git@gitee.com

首次使用需要确认并添加主机到本机SSH可信列表。若返回 Hi XXX! You’ve successfully authenticated, but Gitee.com does not provide shell access. 内容，则证明添加成功

2.1.3、测试

复制你项目的SSH链接

在jenkins所在环境
执行git clone git@gitee.com:xxxx.git

2.2、配置Jenkins的pipeline 自动clone代码

2.2.1、Jenkins创建任务

新建任务

选择流水线 确定

这里勾选参数化构建，选择字符参数，用于输入构建代码的版本

默认值填master，根据自身项目实际填写

拉到最下面的流水线，写pipeline脚本，如果不知道怎么写，可以点击流水线语法进行参考

这是我的脚本， REPOSITORY 填写项目的ssh地址，REPOSITORY_VERSION是刚刚配置的构建参数

pipeline {
    agent any
    
    environment {
        REPOSITORY="git@gitee.com:xxxxxx/cloud-demo.git"
    }
    
    stages {
        stage('拉代码') {
            steps {
                echo "start fetch code from git:${REPOSITORY}"
                deleteDir()
                git branch: "${REPOSITORY_VERSION}", url: "${REPOSITORY}"
            }
        }
    }
}

保存

2.2.2、测试拉代码流程

返回Jenkins 首页，选择刚刚创建的项目

点击右边的运行按钮

输入代码分支版本
点击开始构建

看到这里就是已经构建成功了

根据日志提示的目录，可以看到目录下已经有代码了

3、通过maven构建代码

3.1、maven插件安装

因为这里使用到了maven，jenkins需要先安装maven工具

3.2、maven构建项目

补充pipeline脚本

pipeline {
    agent any
    
    environment {
        REPOSITORY="git@gitee.com:xxxxxx/cloud-demo.git"
        MODULE="cloud-demo-m-test-dubbo-service"
    }
    
    stages {
        stage('拉代码') {
            steps {
                echo "start fetch code from git:${REPOSITORY}"
                deleteDir()
                git branch: "${REPOSITORY_VERSION}", url: "${REPOSITORY}"
            }
        }
        
        stage('编译代码') {
            steps {
                echo "start compile"
                sh "cd cloud-demo-project && mvn -U clean install"
                echo "compile project ................................"
                sh "cd cloud-demo-dependencies && mvn -U clean install"
                echo "compile dependencies ................................"
                sh "cd cloud-demo-common && mvn -U clean install"
                echo "compile common ................................"
                sh "cd cloud-demo-m-test && mvn -U -am clean install"
                echo "compile m-test ................................"
                sh "cd cloud-demo-m-test/cloud-demo-m-test-common && mvn -U -am clean install"
                echo "compile m-test-dubbo-api ................................"
                sh "cd cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-api && mvn -U -am clean install"
                echo "compile m-test-dubbo-service ................................"
                sh "cd cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service && mvn -U -am clean package"
            }
        }
    }
}

这里补充了stage('编译代码') {} 部分，用于maven编译。具体编译脚本需要根据自己项目实际，这个是我项目的编译必须步骤。

3.3、测试拉代码流程+构建项目过程

重复2.2.2步骤，查看运行结果

构建成功

4、将maven构建后的jar打包成docker镜像 并 push docker镜像到docker registry

在jenkins环境下
创建目录用于存放脚本文件

mkdir /usr/local/project/.env/cloud-demo-m-test-dubbo-service/ -p

这个目录下存放4个文件

• build.sh
• Dockerfile
• application.properties
• bootstrap.properties

application.properties 和 bootstrap.properties 是springcloud的配置文件，内容根据自己项目情况

buils.sh 文件内容

#!/usr/bin/env bash

REPOSITORY_VERSION=$1
GIT_REVISION=`git log -1 --pretty=format:"%h"`
TIME=`date "+%Y.%m.%d.%H.%M"`
IMAGE_NAME=192.168.31.100:5000/cloud-demo/cloud-demo-m-test-dubbo-service
IMAGE_TAG=${REPOSITORY_VERSION}-${GIT_REVISION}-${TIME}

docker build -t ${IMAGE_NAME}:${IMAGE_TAG} .

docker push ${IMAGE_NAME}:${IMAGE_TAG}

echo "${IMAGE_NAME}:${IMAGE_TAG}" > IMAGE

## 内容说明
REPOSITORY_VERSION 是需要传入的参数，传项目git分支名，用于打标签使用
GIT_REVISION 是获取当前git的提交版本 如 c9c8525，线上问题可以根据这个版本查找具体代码问题
TIME 年.月.日.时.分  记录打包时间，也用于打标签使用
IMAGE_NAME 镜像名，这里前缀包含了192.168.31.100:5000 是因为我打包之后会push到192.168.31.100:5000，其他服务器可以到这里来pull镜像
docker build -t ${IMAGE_NAME}:${IMAGE_TAG} . 构建镜像
docker push ${IMAGE_NAME}:${IMAGE_TAG}  推送镜像
echo "${IMAGE_NAME}:${IMAGE_TAG}" > IMAGE  把镜像名:镜像标签 输出到IMAGE文件里，方便后续步骤获取

Dockerfile 文件内容

FROM openjdk:8u342-jdk
MAINTAINER yanger yanger@qq.com

COPY target/cloud-demo-m-test-dubbo-service-1.0-SNAPSHOT.jar /cloud-demo-m-test-dubbo-service.jar
COPY application.properties /application.properties
COPY bootstrap.properties /bootstrap.properties
ENTRYPOINT ["java", "-jar", "/cloud-demo-m-test-dubbo-service.jar"]

## 内容说明
FROM openjdk:8u342-jdk 使用openjdk:8u342-jdk 作为基础镜像
COPY 文件到镜像
ENTRYPOINT ["java", "-jar", "/cloud-demo-m-test-dubbo-service.jar"] 启动时运行 java -jar /cloud-demo-m-test-dubbo-service.jar

这里用到了docker registry 如果还没有registry 请先启动，可以用docker的方式启动

docker run -d -p 5000:5000 --name registry registry

build.sh文件需要可执行权限

chmod 755 build.sh

补充pipeline脚本

pipeline {
    agent any
    
    environment {
        REPOSITORY="git@gitee.com:xxxxxx/cloud-demo.git"
        SCRIPT_PATH="/usr/local/project/.env/cloud-demo-m-test-dubbo-service/"
    }
    
    stages {
        stage('拉代码') {
            steps {
                echo "start fetch code from git:${REPOSITORY}"
                deleteDir()
                git branch: "${REPOSITORY_VERSION}", url: "${REPOSITORY}"
            }
        }
        
        stage('编译代码') {
            steps {
                echo "start compile"
                sh "cd cloud-demo-project && /usr/local/maven/bin/mvn -U clean install"
                echo "compile project ................................"
                sh "cd cloud-demo-dependencies && /usr/local/maven/bin/mvn -U clean install"
                echo "compile dependencies ................................"
                sh "cd cloud-demo-common && /usr/local/maven/bin/mvn -U clean install"
                echo "compile common ................................"
                sh "cd cloud-demo-m-test && /usr/local/maven/bin/mvn -U -am clean install"
                echo "compile m-test ................................"
                sh "cd cloud-demo-m-test/cloud-demo-m-test-common && /usr/local/maven/bin/mvn -U -am clean install"
                echo "compile m-test-dubbo-api ................................"
                sh "cd cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-api && /usr/local/maven/bin/mvn -U -am clean install"
                echo "compile m-test-dubbo-service ................................"
                sh "cd cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service && /usr/local/maven/bin/mvn -U -am clean package"
            }
        }

        stage('构建镜像') {
            steps {
                echo "start build image"
                sh "cp ${SCRIPT_PATH}/build.sh cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "cp ${SCRIPT_PATH}/Dockerfile cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "cp ${SCRIPT_PATH}/application.properties cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "cp ${SCRIPT_PATH}/bootstrap.properties cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "cd cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/ && ./build.sh ${REPOSITORY_VERSION}"
            }
        }

    }
}

补充了stage(‘构建镜像’){} 内容和environment 部分加了个参数 SCRIPT_PATH

SCRIPT_PATH参数是上面创建的文件夹路径
stage(‘构建镜像’){}这一步是复制相应文件到项目目录下，并且执行build.sh脚本

测试

可以看到镜像已经打包好，并且已经push到registry了
浏览器访问http://192.168.31.100:5000/v2/cloud-demo/cloud-demo-m-test-dubbo-service/tags/list
可以看到registry有cloud-demo/cloud-demo-m-test-dubbo-service:master-7012e1d-2023.05.01.10.16这个镜像

5、通过k8s发起 发布/更新 服务 操作

5.1、配置构建K8S资源的描述文件

在 /usr/local/project/.env/cloud-demo-m-test-dubbo-service/ 目录新增文件 cloud-demo-m-test-dubbo-service.yaml

文件内容

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: cloud-demo-m-test-dubbo-service
  name: cloud-demo-m-test-dubbo-service
spec:
  replicas: 1
  selector:
    matchLabels:
      app: cloud-demo-m-test-dubbo-service
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: cloud-demo-m-test-dubbo-service
    spec:
      containers:
      - image: IMAGE_AND_TAG
        name: cloud-demo-m-test-dubbo-service
        resources: {}
        volumeMounts: 
        - name: log-path
          mountPath: /logs
      volumes: 
      - name: log-path
        hostPath: 
          path: /root/k8s/cloud-demo-m-test-dubbo-service/logs
status: {}

---

apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: cloud-demo-m-test-dubbo-service
  name: cloud-demo-m-test-dubbo-service
spec:
  ports:
  - port: 20881
    protocol: TCP
    targetPort: 20881
  selector:
    app: cloud-demo-m-test-dubbo-service
  type: NodePort
status:
  loadBalancer: {}

这个文件是构建K8S资源的描述文件，创建deployment 和service，暴露端口20881，挂载/logs目录到主机
其中 IMAGE_AND_TAG 是需要替换为相应 容器名:容器标签 的

5.2、完善jenkins步骤

pipeline {
    agent any
    
    environment {
        REPOSITORY="git@gitee.com:xxxxxx/cloud-demo.git"
        SCRIPT_PATH="/usr/local/project/.env/cloud-demo-m-test-dubbo-service"
        IMAGE=""
    }
    
    stages {
        stage('拉代码') {
            steps {
                echo "start fetch code from git:${REPOSITORY}"
                deleteDir()
                git branch: "${REPOSITORY_VERSION}", url: "${REPOSITORY}"
            }
        }
        
        stage('编译代码') {
            steps {
                echo "start compile"
                sh "cd cloud-demo-project && /usr/local/maven/bin/mvn -U clean install"
                echo "compile project ................................"
                sh "cd cloud-demo-dependencies && /usr/local/maven/bin/mvn -U clean install"
                echo "compile dependencies ................................"
                sh "cd cloud-demo-common && /usr/local/maven/bin/mvn -U clean install"
                echo "compile common ................................"
                sh "cd cloud-demo-m-test && /usr/local/maven/bin/mvn -U -am clean install"
                echo "compile m-test ................................"
                sh "cd cloud-demo-m-test/cloud-demo-m-test-common && /usr/local/maven/bin/mvn -U -am clean install"
                echo "compile m-test-dubbo-api ................................"
                sh "cd cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-api && /usr/local/maven/bin/mvn -U -am clean install"
                echo "compile m-test-dubbo-service ................................"
                sh "cd cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service && /usr/local/maven/bin/mvn -U -am clean package"
            }
        }

        stage('构建镜像') {
            steps {
                echo "start build image"
                sh "cp ${SCRIPT_PATH}/build.sh cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "cp ${SCRIPT_PATH}/Dockerfile cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "cp ${SCRIPT_PATH}/application.properties cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "cp ${SCRIPT_PATH}/bootstrap.properties cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "cd cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/ && ./build.sh ${REPOSITORY_VERSION}"
            }
        }

        stage('发布') {
            steps {
                echo "start deploy"
                script {
                    IMAGE = readFile "cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/IMAGE"
                    IMAGE = IMAGE.trim()
                    if (IMAGE == "") {
                        throw new Exception("获取镜像名文件失败，请重试")
                    }
                }
                echo "IMAGE: -- ${IMAGE}"
                sh "cp ${SCRIPT_PATH}/cloud-demo-m-test-dubbo-service.yaml cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/"
                sh "sed -i \"s#IMAGE_AND_TAG#${IMAGE}#g\" cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/cloud-demo-m-test-dubbo-service.yaml"
                sh "kubectl apply -f cloud-demo-m-test/dubbo/cloud-demo-m-test-dubbo-service/cloud-demo-m-test-dubbo-service.yaml"
            }
        }
    }
}

添加了 stage('发布') {} 部分

• 通过读取IMAGE文件，获取镜像名:镜像标签
• 如果获取不到镜像名:镜像标签，抛出异常
• 将cloud-demo-m-test-dubbo-service.yaml文件复制到工作目录
• 用镜像名:镜像标签 替换掉 IMAGE_AND_TAG
• 使用kubectl命令发布/更新服务

5.3、测试

在jenkins上构建项目

在K8S master服务器上，执行

kubectl get all

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