做这个实验目标是往kubernetes集群里交付dubbo服务，采用jenkins+maven+gitee实现，jenkins使用的是v2.303.1，maven使用3.6.3。jenkins数据存储在nfs目录中。如下图所示：

​​01 jenkins镜像准备​​

1）在host200上下载jenkins镜像

docker pull jenkins/jenkins:2.303.1

2）添加tag，上传到自己的镜像仓库

docker tag 619aabbe0502 harbor.od.com/public/jenkins:2.303.1
docker push harbor.od.com/public/jenkins:2.303.1

3）准备dockerfile，以官方镜像为底包，构建能和docker联动的镜像

mkdir -pv /data/dockerfile/jenkins
cd /data/dockerfile/jenkins

# 准备sshkey
ssh-keygen -t rsa -b 2048 -C "yunweishaonian@yeah.net" -N "" -f /root/.ssh/id_rsa
# 将key复制到当前目录下
cp -a /root/.ssh/id_rsa .
# 获取get-docker.sh，主要是给jenkens安装docker客户端
curl -fsSL get.docker.com -o /data/dockerfile/jenkins/get-docker.sh
# 复制docker的配置文件
cp -a /root/.docker/config.json .
# 添加config文件，后卖就可以绵密登录gitee了
vi config
Host gitee.com
    HostName gitee.com
    User git
    PreferredAuthentications publickey
    IdentityFile /root/.ssh/id_rsa

# 编辑dockerfile
vi /data/dockerfile/jenkins/Dockerfile
FROM harbor.od.com/public/jenkins:2.303.1
USER root
RUN /bin/cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime &&\
    echo 'Asia/Shanghai' > /etc/timezone
ADD id_rsa /root/.ssh/id_rsaADD config.json /root/.docker/config.json
ADD get-docker.sh /get-docker.sh
ADD config /root/.ssh/config
RUN echo "      StrictHostKeyChecking no" >> /etc/ssh/ssh_config &&\
        /get-docker.sh

# build成一个新镜像
docker build . -t harbor.od.com/infra/jenkins:v2.303.1
# 上传至harbor
docker push harbor.od.com/infra/jenkins:v2.303.1

‍

4）在gitee配置公钥

5）测试jenkens镜像是否可用

# 返回成功即可
docker -run --rm harbor.od.com/infra/jenkins:v2.303.1 ssh -T git@gitee.com

​​02 kubernetes 准备​​

1）创建namespace

# 创建namespace
kubectl create namespace infra
# 创建secret,这里的密码为harbor的密码
kubectl create secret docker-registry harbor --docker-server=harbor.od.com --docker-username=admin --docker-password=xxxxx -n infra

​​03 nfs准备​​

1）每个节点都安装nfs-utils

yum install nfs-utils -y

2）在host200上创建共享目录

mkdir -p /data/nfs-volume/jenkins_home

3）host200配置nfs

vi /etc/exports
/data/nfs-volume 192.168.122.0/24(rw,no_root_squash)

4）host200启动nfs服务

systemctl enable nfs
systemctl start nfs

5）测试

[root@host200 ~]# showmount -e
Export list for host200.yunwei.com:
/data/nfs-volume 192.168.122.0/24  # node地址段

​​04 资源配置清单​​

1）创建目录（/data/k8s-yaml/jenkins == http://k8s-yaml.od.com/jenkins/）

mkdir /data/k8s-yaml/jenkins/

2）创建dp.yaml

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: jenkins   
  namespace: infra
  labels: 
    name: jenkins
spec:
  replicas: 1
  selector:
    matchLabels: 
      name: jenkins
  template:
    metadata:
      labels: 
        app: jenkins 
        name: jenkins
    spec:
      volumes:
      - name: data # 创建一个卷
        nfs:  # 卷类型是nfs
          server: host200 # nfs服务器地址
          path: /data/nfs-volume/jenkins_home
      - name: docker # 创建一个卷
        hostPath:  # 类型是hostpath，即本节点路径
          path: /run/docker.sock  # 将物理节点的docker.sock挂在到jenkins里，这样jenkins就可以通过socket和物理节点的docker通信了 
          type: ''
      containers:
      - name: jenkins
        image: harbor.od.com/infra/jenkins:v2.303.1
        imagePullPolicy: IfNotPresent # 镜像拉去策略 awlays 不管本地有没有，都从远程拉，never只从本地拉，IfNotPresent 优先本地，本地没有去远程拉
        ports:
        - containerPort: 8080 
          protocol: TCP
        env:
        - name: JAVA_OPTS
          value: -Xmx512m -Xms512m
        volumeMounts:
        - name: data
          mountPath: /var/jenkins_home # 将host200:/data/nfs-volume/jenkins_home挂在到容器里的/var/jenkins_home
        - name: docker
          mountPath: /run/docker.sock # 将物理主机的/run/docker.sock挂在到容器的/run/docker.sock
      imagePullSecrets:
      - name: harbor # 镜像仓库 之前用kubectl create secret docker-registry harbor --docker-server=harbor.od.com --docker-username=admin --docker-password=xxxxx -n infra 定义了

      securityContext: 
        runAsUser: 0
  strategy:
    type: RollingUpdate # 滚动升级
    rollingUpdate: 
      maxUnavailable: 1
      maxSurge: 1
  revisionHistoryLimit: 7 # 保留7份滚动版本 ，以便回退
  progressDeadlineSeconds: 600 # 启动超时时间

3）创建svc.yaml

kind: Service
apiVersion: v1
metadata: 
  name: jenkins
  namespace: infra
spec:
  ports:
  - protocol: TCP
    port: 80 # cluterip的80端口转换到容器的8080
    targetPort: 8080
  selector:
    app: jenkins

4）ingress.yaml

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

​​05 将jenkins交付到kubernetes集群​​

1）任意一个node创建资源

kubectl create -f http://k8s-yaml.od.com/jenkins/dp.yaml
kubectl create -f http://k8s-yaml.od.com/jenkins/svc.yaml
kubectl create -f http://k8s-yaml.od.com/jenkins/ingress.yaml

2）查看资源情况

[root@host21 ~]# kubectl get all -n infra
NAME                           READY   STATUS    RESTARTS   AGE
pod/jenkins-7df8bf4ff9-qj85m   1/1     Running   0          10h


NAME              TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE
service/jenkins   ClusterIP   10.254.129.207   <none>        80/TCP    13h


NAME                      READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/jenkins   1/1     1            1           10h

NAME                                 DESIRED   CURRENT   READY   AGE
replicaset.apps/jenkins-7df8bf4ff9   1         1         1       10h

​​06 验证jenkins​​

1）验证jenkins镜像的用户

[root@host21 ~]# kubectl exec -it pod/jenkins-7df8bf4ff9-qj85m -n infra /bin/bash
root@jenkins-7df8bf4ff9-qj85m:/# whoami
root

2）验证是否可以登录git

root@jenkins-7df8bf4ff9-qj85m:/# ssh -i /root/.ssh/id_rsa -T git@gitee.com
Hi yunweishaonian! You've successfully authenticated, but GITEE.COM does not provide shell access.

3）验证jenkins是否可以联动host的docker

root@jenkins-7df8bf4ff9-qj85m:/# docker image ls
REPOSITORY                                  TAG                  IMAGE ID       CREATED             SIZE
harbor.od.com/app/dubbo-demo-service        master_211002_2213   a8f3cec136fc   About an hour ago   377MB

​​07 配置jenkins​​

1）在host11添加解析

# 添加解析
vi /var/named/od.com.zone
jenkins  A 192.168.122.10
# 重启dns
systemctl restart named

2）打开网页，查看提示的文件，将密码输入

3）选推荐安装的插件，安装完成后创建admin用户即可

4）进入jenkins

5）修改安全参数

6）下载blue ocean插件

7）在[可选插件]中搜索blue ocean 选择下面的安装后重启

8）安装完成后选择restart

9）一切就绪后，你就可以在首页看到blue ocean了