gitlab+docker+harbor+k8s+jenkins部署简单应用

部署简单的K8s 应用

环境准备！！！！
k8安装
gitlab安装
harbor安装
jenkins安装

要部署 Kubernetes 应用的流程如下：

• 编写代码

• 测试

• 编写 Dockerfile

• 构建打包 Docker 镜像

• 推送 Docker 镜像到仓库

• 编写 Kubernetes YAML 文件

• 更改 YAML 文件中 Docker 镜像 TAG

• 利用 kubectl 工具部署应用

权限问题解决：

• 前面jenkins是用yum安装的，默认启动用户为jenkins，会有很多权限问题。建议更改启动用户，我这里直接修改了相关权限

usermod -a -G docker jenkins
chmod a+rw /var/run/docker.sock
chmod 777 /k8s/k8s.yaml 
visudo
	jenkins ALL=(ALL)       NOPASSWD: ALL

• Dockerfile（需要上传到项目中再clone）

[root@k8s-master cicd]# vim Dockerfile
[root@k8s-master cicd]# cat Dockerfile 
FROM alpine:3.10
MAINTAINER cicd "[email protected]"
WORKDIR /root/cicd

• 部署的yaml文件(/tmp/k8s.yaml)

apiVersion: app/v1
kind: Deployment
metadata:
  name: jenkins-demo
spec:
  selector:
    matchLabels:
      app: jenkins-demo
  template:
    metadata:
      labels:
        app: jenkins-demo
    spec:
      containers:
      - image: cnych/jenkins-demo:>
        imagePullPolicy: IfNotPresent
        name: jenkins-demo
        env:
        - name: branch
          value: >
          
          
[root@k8s-master k8s]# kubectl create namespace jenkins-demo
namespace/jenkins-demo created

• 流水线脚本

pipeline {
    agent any

    stages {
        stage('clone') {
            steps {
                echo "1.Clone Stage"
                withCredentials([usernamePassword(credentialsId: 'gitlab', passwordVariable: 'gitlabPassword', usernameVariable: 'gitlabUser')]) {
                    git branch: 'main', url: "http://${gitlabUser}:${gitlabPassword}@192.168.47.102/cicd/cicd.git"
                }
                git branch: 'main', url: 'http://root:[email protected]/cicd/cicd.git'
                script {
                    build_tag = sh(returnStdout: true, script: 'git rev-parse --short HEAD').trim()
                }
            }
        }
        stage('test') {
            steps {
                echo "2.Test Stage"
            }
        }
        stage('Build') {
            steps {
                echo "3.Build Docker Image Stage"
                sh "docker build -t 192.168.47.101:80/library/jenkins-demo:${build_tag} ."
            }
            
        }
        stage('Push') {
            steps {
                echo "4.Push Docker Image Stage"
                //sh "docker login 192.168.47.101:80 -u admin -p 123456"
                //sh "docker push cnych/jenkins-demo:${build_tag}"
                withCredentials([usernamePassword(credentialsId: 'harbor', passwordVariable: 'harborPassword', usernameVariable: 'harborUser')]) {
                    sh "docker login 192.168.47.101:80 -u ${harborUser} -p ${harborPassword}"
                    sh "docker push 192.168.47.101:80/library/jenkins-demo:${build_tag}"
                }
            }
        }
        stage('Deploy') {
            input {
                message 'Choose a deploy environment'
                ok 'submit'
                parameters {
                    choice choices: ['Dev','QA','main'], name:'userInput'
                }
            }
            steps {
                echo "5. Deploy Stage"
                echo "This is a deploy step to ${userInput}"
                sh '''cd /k8s
                sed -i 's//${build_tag}/g' k8s.yaml
                sed -i 's//${userInput}/g' k8s.yaml'''
                
                script {
                    if (userInput == "Dev") {
                        // deploy dev stuff
                    } else if (userInput == "QA"){
                        // deploy qa stuff
                    } else {
                        // deploy prod stuff
                    }
                }
                
                sh '''sudo kubectl apply -f /k8s/k8s.yaml'''

            }
        }
    }
}