Jenkins流水線發布實現CICD到Kubernetes

Jenkins流水線發布實現CICD到Kubernetes

第一步 本地安裝好Kubernetes

第二步— Install Jenkins

a) Install Java

sudo apt update
sudo apt install openjdk-8-jdk

b) Add Jenkins Repository & append package repository address to the server’s source.list

wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'

c) Install Jenkins

sudo apt update
sudo apt install jenkins

d) check Jenkins status

e) Configure Jenkins with necessary credentials and login to Jenkins

f) Add Jenkins to the docker group “sudo usermod -aG docker jenkins”

g) Install the following plugins for Jenkins

Docker Pipeline
Kubernetes
Kubernetes Continuous Deploy

h) The final step is to use ngrok to expose localhost Jenkins URL as public URL.

Download ngrok and execute it as shown in the image, http://a0ecbd0426f6.ngrok.io/ is the new URL to login to Jenkins and accessible over the internet.

使用ngrok 內網穿透實現本地jenkins互聯網能夠訪問到

第三步: 配置Jenkins Configure Jenkins

a) 選擇 流水線項目Select Demo1 as New Pipeline Project

b) 填入 the GitHub link的倉庫地址

c) Mention the build trigger配置構建觸發器

d) 在流水線中配置GIT地址 In the Pipeline mention the git links and the branch it has to operate upon

e) 配置dockerhub密鑰 Configure docker hub credentials

f) Update Jenkinsfile -Its a declarative pipeline which is used as a code. It helps the pipeline code easier to read and write. This code is written in a Jenkinsfile.

當代碼提交到github時，Jenkins會收到一個webhook已配置於Github, 整個階段流程如下：

In this implementation, the moment code is checked-in, Jenkins will have a notification through a webhook configured in Github. it follows the following stages below

i) Check out the source

ii)Build the new image

iii) Push it to the new repository

iv) Deploy the app on Kube

pipeline {

  agent any

  stages {

    stage('Checkout Source') {
       steps {
         git url:'https://github.com/vamsijakkula/hellowhale.git', branch:'master'
       }
     }
    
       stage("Build image") {
             steps {
                 script {
                     myapp = docker.build("vamsijakkula/hellowhale:${env.BUILD_ID}")
                 }
             }
         }
    
       stage("Push image") {
             steps {
                 script {
                     docker.withRegistry('https://registry.hub.docker.com', 'dockerhub') {
                             myapp.push("latest")
                             myapp.push("${env.BUILD_ID}")
                     }
                 }
             }
         }

   
     stage('Deploy App') {
       steps {
         script {
           kubernetesDeploy(configs: "hellowhale.yml", kubeconfigId: "mykubeconfig")
         }
       }
     }

  }

}

g) Have the configuration of mykubeconfig in Jenkins defined

h) Also have the connection between Jenkins and Kubernetes in place

i) Mention the Jenkins URL

j)Update the pod template.

k) Configure the webhook in Github

第4步 — Develop application deployment manifest. In this tutorial, we are deploying a simple hellowhale app exposed as NodePort.

---
apiVersion: apps/v1
kind: Deployment
metadata:
   name: hello-blue-whale
spec:
   replicas: 3
   selector:
     matchLabels:
       app: hello-whale-app
       version: blue
   template:
     metadata:
       name: hello-blue-whale-pod
       labels:
         app: hello-whale-app
         version: blue
     spec:
       containers:
       - name: hello-whale-container
         image: vamsijakkula/hellowhale:latest
         imagePullPolicy: Always
         ports:
         - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
   name: hello-whale-svc
   labels:
     app: hello-whale-app
spec:
   selector:
     app: hello-whale-app
     version: blue
   type: NodePort
   ports:
   - nodePort: 31113
     port: 80
     targetPort: 80

第5步: Check-in the application manifest in GitHub and we can see the deployment starting in Jenkins

第6步 Once the deployment is completed, we can see the following pods(3) are in place and exposed as NodePort(31113)

Access the deployment on NodePort.

第7步: 通過deployment調整實例從3個到5個，如下在kube可以看到。 Update the deployment by changing the replica’s from 3 to 5 and we can see 5 pods are deployed on Kube.

GIT示例倉庫 https://github.com/vamsijakkula/hellowhale

總結

      此示例以本地環境部署Kubernetes的2個簡單結點，內網穿透暴露於互聯網， 基於nginx的前端程序構建docker，通過jenkins的pipeline流水線發布到Kubernetes.
實現CI CD過程，示例代碼於公網。 對雲原生技術CI CD是關鍵的DevOps基礎過程，需要今天廣大開發工程師了解。

---

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作者：Petter Liu
出處：http://www.cnblogs.com/wintersun/
本文版權歸作者和博客園共有，歡迎轉載，但未經作者同意必須保留此段聲明，且在文章頁面明顯位置給出原文連接，否則保留追究法律責任的權利。 該文章也同時發布在我的獨立博客中-Petter Liu Blog。