jenkins部署k8s項目-CICD

一 環境準備

1 docker倉庫，harbor我這裏用的是線上的hub https://hub.docker.com/ 自己註冊即可
2 準備git倉庫，我這裏用的是碼雲 https://gitee.com/huningfei/java.git
3 準備好k8s環境，一主兩從，可以二進制安裝，也可以kubeadmin安裝
master:172.16.78.103 node1:172.16.78.102 node2:172.16.78.101
4 準備好jenkins環境，（我是利用jenkins.war包直接部署的，也可以用k8s部署jenkins）

二 k8s部署

我是用kubeadmin快速部署的 參考 https://cloud.tencent.com/developer/article/1509412
安裝之前，把iptables和selinux關掉。
1 master節點安裝

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
  269   yum -y install docker-ce-18.06.1.ce-3.el7

  271  curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
  272  systemctl enable docker && systemctl start docker
# 添加kubernetes YUM軟件源
  275  cat > /etc/yum.repos.d/kubernetes.repo << EOF
  276  [kubernetes]
  277  name=Kubernetes
  278  baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
  279  enabled=1
  280  gpgcheck=0
  281  repo_gpgcheck=0
  282  gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
  283  EOF
  284  ll /etc/yum.repos.d/kubernetes.repo 
#安裝kubeadm,kubelet和kubectl
  285  yum install -y kubelet-1.15.0 kubeadm-1.15.0 kubectl-1.15.0
  286  kubectl systemctl enable kubelet

 # 部署Kubernetes Master  只需要在Master 節點執行，這裏的apiserve需要修改成自己的master地址
 kubeadm init --apiserver-advertise-address=172.16.78.103 --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.15.0 --service-cidr=10.1.0.0/16 --pod-network-cidr=10.244.0.0/16
 最後出現  Your Kubernetes control-plane has initialized successfully! 即爲安裝成功

# 最後根據提示操作
 mkdir -p $HOME/.kube
 sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
 sudo chown $(id -u):$(id -g) $HOME/.kube/config

# 安裝網絡插件
wget https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml

修改鏡像地址：(有可能默認不能拉取，確保能夠訪問到quay.io這個registery,否則修改如下內容)
    cat -n  kube-flannel.yml|grep lizhenliang/flannel:v0.11.0-amd64
   106          image: lizhenliang/flannel:v0.11.0-amd64
   120          image: lizhenliang/flannel:v0.11.0-amd64
kubectl apply -f kube-flannel.yml 

2 node節點安裝

#!/bin/bash
#install docker
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
  yum -y install docker-ce-18.06.1.ce-3.el7
   curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
  systemctl enable docker && systemctl start docker

# repo
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

#install k8s
yum install -y kubelet-1.15.0 kubeadm-1.15.0 kubectl-1.15.0
systemctl enable kubelet

echo "1" >/proc/sys/net/bridge/bridge-nf-call-iptables

#join master
kubeadm join 172.16.78.103:6443 --token culxlo.ovuhhraplwritzgh     --discovery-token-ca-cert-hash sha256:3dfb2e64dfc2c603c1cfccceff82dbc1b680b117fdbbe0512889d3a74240a3b8
# 在加入的時候提示報錯:
[ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables contents are not set to 1
    [ERROR Swap]: running with swap on is not supported. Please disable swap
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

# 解決辦法
echo "1" >/proc/sys/net/bridge/bridge-nf-call-iptables

3 最後查看查看集羣node狀態

三設置jenkins

1 安裝Kubernetes 和git，pipeline 安裝這三個插件，安裝maven和docker環境。

yum install maven
# install docker
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
  yum -y install docker-ce-18.06.1.ce-3.el7
   curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
  systemctl enable docker && systemctl start docker

 # 還需要注意一點，如果你的jenkins是用普通用戶啓動的，當構建的時候可能會提示權限問題， 要改一下/var/run/docker.sock  這個文件的權限

2 設置jenkins去連接k8s api

系統管理---系統設置-cloud

kubernetes 服務證書從哪裏來？

2-1 如果是kubeadmin部署的k8s,就比較麻煩，進入到 /etc/kubernetes目錄下面打開admin.conf配置文件，文件中有三個值 certificate-authority-data 、client-certificate-data 、 client-key-data 分別用這三部分生成證書，這裏我把生成的證書都放到了tmp目錄下面

echo 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 | base64 -d > /tmp/ca.crt

echo 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  | base64 -d > /tmp/client.key

echo 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 | base64 -d > /tmp/client.crt

然後到tmp目錄，在生成一個ca.crt證書和一個cert.pfx

openssl pkcs12 -export -out cert.pfx -inkey client.key -in client.crt -certfile ca.crt
 生成一個pfx的證書，會提示你輸入密碼 111

然後將ca.crt裏面的內容放到jenkisn服務證書key的地方即可。

如何添加憑據？

點擊add,選擇kind類型，然後上傳你剛纔生成的cert.pfx這個證書，並且輸入剛纔的密碼

最終去測試jenkins能否連接成功，如圖

2-2 如果你的jenkins是直接部署在k8s之內的，就比較簡單，不需要填寫證書，直接這樣，如圖：

2-3如果你是用的二進制安裝的k8s,這個證書在安裝過程中，會產生，我測試了用ca.pem和server.pem發現都可以連接，並且不需要添加憑據。

四 用pipeline發佈k8s項目

腳本內容如下：

// 公共
def registry = "huningfei"
// 項目
def project = "welcome"
def app_name = "demo"
def image_name = "${registry}/${project}:${BUILD_NUMBER}"
def git_address = "https://gitee.com/huningfei/java.git"
// 認證
def secret_name = "registry-pull-secret"
def docker_registry_auth = "450fb8b4-62c9-43fe-8a69-ec30705e724e"
def git_auth = "b363af0f-a96c-465c-a14e-60f7127727eb"
def k8s_auth = "a60b4b7f-2aef-4622-94a5-6efef67c4ac9"

  node(){
      // 第一步
      stage('拉取代碼'){
         checkout([$class: 'GitSCM', branches: [[name: '${Branch}']], userRemoteConfigs: [[credentialsId: "${git_auth}", url: "${git_address}"]]])
      }
      // 第二步
      stage('代碼編譯'){
          sh "mvn clean package -Dmaven.test.skip=true"
      }
      // 第三步
      stage('構建鏡像'){
          withCredentials([usernamePassword(credentialsId: "${docker_registry_auth}", passwordVariable: 'password', usernameVariable: 'username')]) {
            sh """
              echo '
                FROM lizhenliang/tomcat 
                RUN rm -rf /usr/local/tomcat/webapps/*
                ADD target/*.war /usr/local/tomcat/webapps/ROOT.war 
              ' > Dockerfile
              docker build -t ${image_name} .
              docker login -u ${username} -p '${password}'
              docker push ${image_name}
            """
            }
      }
      // 第四步
      stage('部署到K8S平臺'){
          sh """
          sed -i 's#\$IMAGE_NAME#${image_name}#' deploy.yml
          sed -i 's#\$SECRET_NAME#${secret_name}#' deploy.yml
          """
          kubernetesDeploy configs: 'deploy.yml', kubeconfigId: "${k8s_auth}"
      }
  }

###注意： 腳本里面的deploy.yml是部署k8s的文件，這個文件必須存到gitlab倉庫裏面就是要跟代碼在同一級目錄裏面

腳本上面三個認證的id從哪裏獲取？

添加完成之後，去憑據裏面查看即可

最後構建項目
出現下面即可成功

然後到k8s-master上面查看是否生成新的pod容器

查看ingress

綁定host即可訪問

五 測試修復一個bug,提交代碼，重新部署

這個java項目需要連接數據庫，在配置文件改一下數據庫的地址，然後提交代碼，重新構建
1 準備一個數據庫，授權一個用戶

 grant all on *.* to 'demo'@'%'identified by '123456';

2 修改代碼裏面連接數據庫的地址

vim tomcat-java-demo-master/src/main/resources/application.yml

 url: jdbc:mysql://db-0.mysql:3306/test?characterEncoding=utf-8

3 安裝mysql，我這裏用k8s直接創建

[root@sass001 java-demo]# cat mysql.yaml 
apiVersion: v1
kind: Service
metadata:
  name: mysql
  labels: 
    project: java-demo
    app: mysql
spec:
  ports:
  - port: 3306 
    name: mysql 
  clusterIP: None
  selector:
    project: java-demo
    app: mysql

---

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: db
spec:
  selector:
    matchLabels:
      project: java-demo
      app: mysql
  serviceName: "mysql"
  template:
    metadata:
      labels:
        project: java-demo
        app: mysql
    spec:
      containers:
      - name: mysql
        image: mysql:5.7 
        ports: 
        - containerPort: 3306
        env: 
        - name: MYSQL_ROOT_PASSWORD
          value: "123456"
        volumeMounts:
        - mountPath: /var/lib/mysql
          name: data
  volumeClaimTemplates:
  - metadata:
      name: data 
    spec:
      accessModes: ["ReadWriteOnce"]
      storageClassName: "managed-nfs-storage"
      resources:
        requests:
          storage: 2Gi 

kubectl create -f mysql.yaml

修改完代碼之後，提交到git倉庫，最後在重新發布項目

最後測試功能