Golang交付至Kubernetes

0、前言

如果还不知道kubernetes下如何实现jenkins slave可以参考我的另一个博文Kubernetes Jenkins动态创建Slave

1、Go服务构建

我们需要通过自定义镜像底包,能够让该底包拥有启动go程序的基本功能和日志重定向输出到指定目录下,方便日志收集,编辑完相关文件后,我们需要通过docker命令去构建镜像,构建完毕后将其推送到harbor base仓库,该名为base的仓库需要手动去harbor上创建。

1.1、制作Go服务镜像底包

1.编写Dockerfile以及相关的启动脚本

  • Dcokerfile
FROM alpine
USER root
RUN apk add tzdata && /bin/cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime &&\
    echo 'Asia/Shanghai' >/etc/timezone &&\
    mkdir /opt/logs 
WORKDIR /opt/project_dir/
ADD entrypoint.sh /entrypoint.sh
CMD ["/entrypoint.sh"]
  • entrypoint.sh
#!/bin/sh
APP_NAME=${APP_NAME:-"app"}
exec ${APP_NAME} >> /opt/logs/stdout.log 2>&1

APP_NAME:启动的二进制文件名,这个可以手动传入或者默认为名为app

2.构建镜像并上传到harbor仓库

$ docker build ./ -t harbor.od.com/base/go-run:1.14.2-1
Sending build context to Docker daemon  3.072kB
Step 1/6 : FROM alpine
 ---> a187dde48cd2
Step 2/6 : USER root
 ---> Using cache
 ---> f0673624a0e0
Step 3/6 : RUN apk add tzdata && /bin/cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime &&    echo 'Asia/Shanghai' >/etc/timezone &&    mkdir /opt/logs
 ---> Using cache
 ---> e91f2e8a4919
Step 4/6 : WORKDIR /opt/project_dir/
 ---> Using cache
 ---> 6afa8e9ddd43
Step 5/6 : ADD entrypoint.sh /entrypoint.sh
 ---> Using cache
 ---> 7a7efe533a5f
Step 6/6 : CMD ["/entrypoint.sh"]
 ---> Using cache
 ---> 17d85fd60af3
Successfully built 17d85fd60af3
Successfully tagged harbor.od.com/base/go-run:1.14.2-1

$ docker push harbor.od.com/base/go-run:1.14.2-1
The push refers to repository [harbor.od.com/base/go-run]
20c042b1ca31: Mounted from base/go-test 
98e20bd596b3: Mounted from base/go-test 
f4ee0579d5d8: Mounted from base/go-test 
beee9f30bc1f: Mounted from base/go-test 
1.14.2-1: digest: sha256:49dda47c11a3148fdfd60fe4850ada128e6550fb33c1a6284caadf0e6ea8016d size: 1153

1.2、制作slave基础镜像底包

我们是基于jenkins slave方式去构建项目,并且使用pipeline来实现流程化,我们都知道slave运行的是一个pod,那么pod里可以有多个容器,而这些一个一个的容器就是执行我们对应操作的环境,所以我们需要通过制作一些镜像来满足我们的需求。

镜像需求:
1、编译golang应用:golang:v1.14.2
2、打包镜像并推送到harbor:

1.2.1、Golang镜像

该镜像主要用于构建golang应用,我们是在基于golang v1.14.2环境下开发的golang程序,所以这里镜像版本就选择:golang:v1.14.2

$ docker pull golang:v1.14.2
$ docker tag a1c86c0786 harbor.od.com/public/golang:v1.14.2
$ docker push harbor.od.com/public/golang:v1.14.2

1.2.2、Docker镜像

该镜像主要用于将编译好的golang项目打包成镜像并推送到harbor,但需要定制化一下镜像,需要将一台已经实现docker login 登录到harbor仓库所生成的配置文件,路径为:/root/.docker/config.json,与原始Docker镜像一起打包生成新的Docker镜像并推送到本地仓库。
1.准备镜像文件

$ docker pull docker:19.03
$ docker tag e036013d6d10 harbor.od.com/public/docker:v19.03
$ docker push harbor.od.com/public/docker:v19.03

2.准备Dockerfile和config.json

  • Dockerfile
FROM harbor.od.com/public/docker:v19.03
USER root
ADD config.json /root/.docker/config.json

3.将/root/.docker/config.json文件拷贝到Dockerfile目录下

{
	"auths": {
		"harbor.od.com": {
			"auth": "YWRtaW46SGFyYm9yMTIzNDU="
		}
	},
	"HttpHeaders": {
		"User-Agent": "Docker-Client/19.03.6 (linux)"
	}
}

4.制作并推送镜像

$ docker build ./ -t harbor.od.com/public/docker:v19.03
$ docker push  harbor.od.com/public/docker:v19.0

2、Jenkins流水线

2.1、创建流水线

1.添加参数化构建

- Choice Parameterr:app_project
  Value:zj-skyquery
  Describe:项目名必须和git仓库名一致

- Choice Parameterr:image_name
  Value:app/skyquery
  Describe:镜像名称:仓库名/镜像名

- String Parameterr:git_ver
  Value:zmaster
  Describe:Git仓库分支或Commit ID

- String Parameterr:add_tag
  Value:
  Describe:打包镜像tag,一般为日期时间

- Choice Parameterr:git_repo
  Value:https://gitee.com/jasonminghao/zj-skyquery.git
  Describe:代码仓库地址

- Choice Parameterr:base_image
  Value:base/go-run:1.14.2-1
  Describe:基础镜像底包

2.pipeline代码

podTemplate(cloud:'kubernetes',containers: [
    containerTemplate(
       name: 'go-build', 
       envVars: [
         envVar(key: 'GO111MODULE', value: 'on'), 
         envVar(key: 'GOPROXY', value: 'https://goproxy.io'),
         envVar(key: 'CGO_ENABLED', value: '0'),
         envVar(key: 'GOOS', value: 'linux')
       ],
       image: 'harbor.od.com/infra/golang:v1.14.2', 
       ttyEnabled: true,
       command: 'cat'),
    containerTemplate(
       name: 'docker',
      ttyEnabled: true,
      image: 'harbor.od.com/public/docker:v19.03'),
    ],
    volumes: [
       nfsVolume(mountPath: '/go/pkg/mod', readOnly: false, serverAddress: 'hdss7-200.host.com', serverPath: '/data/nfs-volume/go-pkg/'),
       hostPathVolume(hostPath: '/run/docker.sock', mountPath: '/run/docker.sock')
            ]
 ){
    node(POD_LABEL) {
        stage('Get a Go project') {
        // 从git仓库拉取代码
        checkout([$class: 'GitSCM', branches: [[name: "${params.git_ver}"]], browser: [$class: 'GitLab', repoUrl: ''], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[credentialsId: 'git', name: 'git', refspec: 'refs/changes/*:refs/changes/*', url: "${params.git_repo}"]]])

            container('go-build') {
                stage('Build a go project') {
                  // 将go应用构建名为app的可执行二进制文件
                  sh "go build -o app"
                }
            }
        }
        stage('Docker build') {
            container('docker') {
                stage('create dir'){
                  sh "mkdir -p /tmp/${params.app_project}/project_dir && mv ./app /tmp/${params.app_project}/project_dir"
                stage('build docker iamge'){
                 sh """
                   echo "FROM harbor.od.com/${params.base_image}" >/tmp/${params.app_project}/Dockerfile
                   echo "ADD ./project_dir /opt/project_dir" >>/tmp/${params.app_project}/Dockerfile
                  """
                  sh "cd /tmp/${params.app_project}/ && pwd && docker build ./ -t harbor.od.com/${params.image_name}:${params.git_ver}_${params.add_tag} && docker push harbor.od.com/${params.image_name}:${params.git_ver}_${params.add_tag} "                              

                 }
              }
            }
        }
    }
}

我们在podTemplate里需要导入以下几个变量(pipeline已通过env实现)

// 如果运行的golang镜像没有以下变量会导致无法执行go build以及可执行文件无法在linux上运行
GO111MODULE =  on
GOPROXY = "https://goproxy.io"
CGO_ENABLED = 0 
GOOS = linux 

之前我们遇到过一个问题,golang应用构建成功,也有二进制文件,但是我们将其通过deployment交付到k8s的时候容器会启动失败,并且报错是 not found,但是把编译的文件拿到linux上可正常运行,就是在docker里运行失败,最后我们去网上查了一些资料,通过增加CGO_ENABLED=0 参数重新编译即可解决该问题。

2.2、流水线构建

1.填写参数构建

2.构建后的结果

3、golang资源配置清单

3.1、准备资源配置清单

1.deployment

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: sky-query
  namespace: app
  labels: 
    name: sky-query
spec:
  replicas: 1
  selector:
    matchLabels: 
      name: sky-query
  template:
    metadata:
      labels: 
        app: sky-query
        name: sky-query
    spec:
      containers:
      - name: sky-query
        image: harbor.od.com/app/skyquery:master_20200424_1725
        ports:
        - containerPort: 80
          protocol: TCP
        imagePullPolicy: IfNotPresent
      imagePullSecrets:
      - name: harbor
      restartPolicy: Always
      terminationGracePeriodSeconds: 30
      securityContext: 
        runAsUser: 0
      schedulerName: default-scheduler
  strategy:
    type: RollingUpdate
    rollingUpdate: 
      maxUnavailable: 1
      maxSurge: 1
  revisionHistoryLimit: 7
  progressDeadlineSeconds: 600

2.svc

kind: Service
apiVersion: v1
metadata: 
  name: sky-query
  namespace: app
spec:
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
  selector: 
    name: sky-query

3.ingress

kind: Ingress
apiVersion: extensions/v1beta1
metadata: 
  name: sky-query
  namespace: app
spec:
  rules:
  - host: sk-query.od.com
    http:
      paths:
      - path: /
        backend: 
          serviceName: sky-query
          servicePort: 80

3.2、应用资源配置清单

$ kubectl  apply -f ./
deployment.extensions/sky-query created
ingress.extensions/sky-query created
service/sky-query created

查看pod运行状态

$ kubectl get pods -n app
NAME                         READY   STATUS    RESTARTS   AGE
sky-query-55474c768d-x8qj5   1/1     Running   0          2m10s

3.3、浏览器访问golang业务

我们是通过ingress实现域名访问golang业务,以为是实验环境,我部署了内部自建dns,那我就直接将A记录添加到dns中,那么各位如果没有自建dns,直接将解析添加到hosts文件中。

1.域名解析

$ vim /var/named/od.com.zone 
sk-query           A    10.4.7.10

$ systemctl restart named

2.浏览器访问

posted @ 2020-04-24 17:49  jasonminghao  阅读(1620)  评论(3编辑  收藏  举报