devops: gitlab-jenkins-k8s

构建代码准备
- 构建
!/bin/bash
- k8s配置

步骤：

代码中编写Dockerfile及build.gradle
jenkins 配置gitlab repo，并使用 gradle 构建项目
k8s部署镜像
构建代码准备
项目中编写 build.gradle 文件，内容如下 ``` defaultTasks ‘push’

project.group = ‘cbd’ project.version = “${VERSION}” // 依赖环境变量 VERSION（后续可在jenkins上设置）

ext { env = System.getenv() }

// 依赖环境变量 DOCKER_REPO、TAG_VALUE def imageName = “${env.DOCKER_REPO}/${project.group}/${project.name}:${env.TAG_VALUE}”

task build(type: Exec) { workingDir ‘.’ // Dockerfile 放置在项目根目录的 docker 目录下 commandLine ‘docker’, ‘build’, ‘-t’, imageName, ‘-f’, ‘docker/Dockerfile’, ‘.’ }

task push(type: Exec, dependsOn: ‘build’) { commandLine ‘docker’, ‘push’, imageName }

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## jenkins配置
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### 代码位置
- Repository URL：git@git.tianrang-inc.com:jd/java-web-tools.git
- Credentials：jenkins (to login gitlab by privatekey)<br />
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### 自动构建（可选）
1. 勾选 Build when a change is pushed to GitLab. GitLab webhook URL: http://xyz，如下图![截屏2020-05-19 10.03.59.png](https://cdn.nlark.com/yuque/0/2020/png/402171/1589854124360-4b06370c-a398-49b4-bc1a-6180fea18b56.png#align=left&display=inline&height=522&margin=%5Bobject%20Object%5D&name=%E6%88%AA%E5%B1%8F2020-05-19%2010.03.59.png&originHeight=522&originWidth=2350&size=97313&status=done&style=none&width=2350)
1. 点击Advanced按钮，可看到 Secret token，如下图：![截屏2020-05-19 10.03.23.png](https://cdn.nlark.com/yuque/0/2020/png/402171/1589854106211-6f8d9933-6b9c-47ed-bacb-de8672e99b59.png#align=left&display=inline&height=522&margin=%5Bobject%20Object%5D&name=%E6%88%AA%E5%B1%8F2020-05-19%2010.03.23.png&originHeight=522&originWidth=2350&size=91806&status=done&style=none&width=2350)
1. 只勾选 Push Events，当 gitlab 的 master 分支发生 push 时，会**触发自动构建**操作
gitlab中增加web hook步骤：
1. settings -> integrations（新版为webhooks）
1. URL填写jenkins中所展示的项目URL
1. Secret Token填写jenkins中的token
1. Trigger选择Push Events，如下图所示![截屏2020-05-19 10.06.01.png](https://cdn.nlark.com/yuque/0/2020/png/402171/1589854066525-cecc81ab-f26a-42de-b9e8-57de7516b883.png#align=left&display=inline&height=754&margin=%5Bobject%20Object%5D&name=%E6%88%AA%E5%B1%8F2020-05-19%2010.06.01.png&originHeight=754&originWidth=2350&size=148847&status=done&style=none&width=2350)
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### 配置使用gradle打包
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#### 构建环境
Inject environment variables to the build process -> Properties Content
支持读取 .properties 中的设置，比如project.properties
```bash
DOCKER_REPO=hub-docker.tianrang-inc.com
DOCKER_REPO_HZ=hub-docker.tianrang-inc.com
VERSION_NUMBER=0.0.1
TAG_VALUE=${GIT_LOCAL_BRANCH}-${VERSION_NUMBER}-build.${BUILD_NUMBER}

Set Build Name -> Build Name: ${TAG_VALUE}

构建

执行 shell ```bash
!/bin/bash

docker login -p ${REGISTRY_PASSWD} -u ${REGISTRY_NAME} http://${DOCKER_REPO} docker login -p ${REGISTRY_PASSWD} -u ${REGISTRY_NAME} ${DOCKER_REPO_HZ}


2. 选择 Involke gradle，其他选项保存默认值
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### 自动部署（可选）
1. 切换至 build 标签
1. 点击下方“Add build Step”按钮，选择“Send files or execute commands over SSH”
1. SSH Server选择恰当的地址
1. Exec command填写以下内容
```bash
#!/bin/bash
kubectl set image deploy/homepage homepage=hub-docker.tianrang-inc.com/tianrang/tr-homepage:${TAG_VALUE} -n tianrang-dev

k8s配置

创建命名空间

apiVersion: v1
kind: Namespace
metadata:
  name: tianrang-dev

创建部署

---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: homepage
  namespace: tianrang-dev
  labels:
    app: homepage
spec:
  replicas: 1
  selector:
    matchLabels:
      app: homepage
  template:
    metadata:
      labels:
        app: homepage
    spec:
      containers:
      - name: homepage
        image: hub-docker.tianrang-inc.com/tianrang/tr-homepage:master-0.0.1-build.3
        ports:
        - name: api
          containerPort: 80
          protocol: TCP
        imagePullPolicy: IfNotPresent
        resources:
          limits:
            memory: 256Mi
          requests:
            memory: 256Mi
      imagePullSecrets:
      - name: regcred
      schedulerName: default-scheduler

创建服务

---
kind: Service
apiVersion: v1
metadata:
  name: homepage
  namespace: tianrang-dev
spec:
  ports:
  - name: api
    protocol: TCP
    port: 80
    targetPort: 80
  selector:
    app: homepage
  type: NodePort
  #type: ClusterIP
  sessionAffinity: None
  externalTrafficPolicy: Cluster

查看访问地址

打开k8s dashboard
命名空间切换选择“tianrang-dev”
切到服务页面，点击“homepage”，查看内部端点的第二行端口，如下图所示
使用dashboard的IP地址加上第三步的端口组成服务访问地址，如dashboard地址为http://172.18.192.7:31111/，服务端口为30458，那么服务访问地址就是http://172.18.192.7:30458/

构建代码准备

构建

!/bin/bash

k8s配置

创建命名空间

创建部署

创建服务

查看访问地址