学习笔记七：基于Jenkins+k8s+Git+DockerHub等技术链构建企业级DevOps容器云平台

基于Jenkins+k8s+Git+DockerHub等技术链构建企业级DevOps容器云平台

K8s版本

kubectl get nodes

jenkins版本：
最新版

安装Jenkins

安装nfs服务，可以选择自己的任意一台机器，我选择的是k8s的控制节点k8smaster1
如果已经安装过nfs，这个步骤可以忽略

yum install nfs-utils -y
systemctl start nfs
systemctl enable nfs

在k8smaster1上创建一个nfs共享目录

mkdir /data/v2  -p
vim /etc/exports

/data/v1 *(rw,no_root_squash)/data/v2 *(rw,no_root_squash)

使配置文件生效

exportfs -arv

在kubernetes中部署jenkins

创建名称空间

kubectl create namespace jenkins-k8s

创建pv,上传pv.yaml

cat pv.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: jenkins-k8s-pv
spec:
  capacity:
    storage: 10Gi
  accessModes:- ReadWriteMany
  nfs:
    server:192.168.40.180
    path:/data/v2

kubectl apply-f pv.yaml
kubectl get pv

创建pvc

cat pvc.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: jenkins-k8s-pvc
  namespace: jenkins-k8s
spec:
  resources:
    requests:
      storage: 10Gi
  accessModes:- ReadWriteMany

kubectl apply-f pvc.yaml
kubectl get pvc -n jenkins-k8s

创建一个sa账号

kubectl create sa jenkins-k8s-sa -n jenkins-k8s

把上面的sa账号做rbac授权

kubectl create clusterrolebinding jenkins-k8s-sa-cluster -n jenkins-k8s  --clusterrole=cluster-admin --serviceaccount=jenkins-k8s:jenkins-k8s-sa

通过deployment部署jenkins

在k8snode节点执行
jenkins安装的时候，每次镜像都要下载最新的，安装最新版jenkins，如何下载最新的镜像？

docker pull jenkins/jenkins:2.394
docker save -o jenkins2.394  jenkins/jenkins:2.394
ctr -n=k8s.io images import jenkins2.394

docker load -i jenkins-slave-latest.tar.gz
ctr -n=k8s.io images import jenkins-slave-latest.tar.gz

备注：jenkins-slave-latest.tar.gz这个里面封装的镜像是jenkins-slave-latest:v1，这个jenkins-slave-latest:v1镜像制作方法如下：

cd /root/slave
cat dockerfile

FROM jenkins/jnlp-slave:4.13.3-1-jdk11
USER root
# 安装Docker
RUN apt-get update && apt-get install -y \
    docker.io
# 将当前用户加入docker用户组
RUN usermod -aG docker jenkins`在这里插入代码片`
RUN curl -LO https://dl.k8s.io/release/stable.txt
RUN curl -LO https://dl.k8s.io/release/$(cat stable.txt)/bin/linux/amd64/kubectl
RUN chmod +x kubectl
RUN mv kubectl /usr/local/bin/
ENV DOCKER_HOST unix:///var/run/docker.sock

docker build -t=jenkins-slave-latest:v1 .
docker save -o jenkins-slave-latest.tar.gz  jenkins-slave-latest:v1

更新资源清单文件

cat jenkins-deployment.yaml

kind: Deployment
apiVersion: apps/v1
metadata:
  name: jenkins
  namespace: jenkins-k8s
spec:
  replicas:1
  selector:
    matchLabels:
      app: jenkins
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      serviceAccount: jenkins-k8s-sa
      containers:- name: jenkins
        image:  jenkins/jenkins:2.361.4
        imagePullPolicy: IfNotPresent
        ports:- containerPort:8080
          name: web
          protocol: TCP
        - containerPort:50000
          name: agent
          protocol: TCP
        resources:
          limits:
            cpu: 2000m
            memory: 2Gi
          requests:
            cpu: 500m
            memory: 512Mi
        livenessProbe:
          httpGet:
            path:/login
            port:8080
          initialDelaySeconds:60
          timeoutSeconds:5
          failureThreshold:12
        readinessProbe:
          httpGet:
            path:/login
            port:8080
          initialDelaySeconds:60
          timeoutSeconds:5
          failureThreshold:12
        volumeMounts:- name: jenkins-volume
          subPath: jenkins-home
          mountPath:/var/jenkins_home
      volumes:- name: jenkins-volume
        persistentVolumeClaim:
          claimName: jenkins-k8s-pvc

kubectl apply-f jenkins-deployment.yaml
kubectl get pods -n jenkins-k8s

NAME                       READY   STATUS   RESTARTS     AGE
jenkins-75c478947f-2tx8h   0/1     Error    1(3s ago)   4s

看到jenkins-75c478947f-2tx8h 是CrashLoopBackOff状态，查看日志：

kubectl logs jenkins-75c478947f-2tx8h -n jenkins-k8s

报错显示没有权限操作/var/jenkins_home/copy_reference_file.log文件

touch: cannot touch '/var/jenkins_home/copy_reference_file.log': Permission denied
Can not write to /var/jenkins_home/copy_reference_file.log. Wrong volume permissions?

解决办法如下：在k8smaster执行

kubectl delete -f jenkins-deployment.yaml
chown -R 1000.1000/data/v2

kubectl apply-f jenkins-deployment.yaml

查看pod是否创建成功:

kubectl get pods -n jenkins-k8s

把jenkins前端加上service，提供外部网络访问

cat jenkins-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: jenkins-service
  namespace: jenkins-k8s
  labels:
    app: jenkins
spec:
  selector:
    app: jenkins
  type: NodePort
  ports:- name: web
    port:8080
    targetPort: web
    nodePort:30002- name: agent
    port:50000
    targetPort: agent

kubectl apply-f jenkins-service.yaml
kubectl get svc -n jenkins-k8s

通过上面可以看到service的8080端口在物理机映射的端口是30002

配置Jenkins

在浏览器访问jenkins的web界面：

获取管理员密码

在nfs服务端，也就是我们的master1节点获取密码：

cat  /data/v2/jenkins-home/secrets/initialAdminPassword

把上面获取到的密码拷贝到上面管理员密码下的方框里

点击继续，出现如下界面

安装插件,安装推荐的插件

插件安装好之后显示如下,创建第一个管理员用户

用户名和密码都设置成admin，线上环境需要设置成复杂的密码
修改好之后点击保存并完成，出现如下界面
点击保存并完成，出现如下界面

点击保存并完成，出现如下界面

测试jenkins的CI/CD