K8S安裝（五）: 在K8S集群中部署Springboot 微服務應用示例 ，通過Ingress-Nginx對外暴露應用服務

本文主要模擬Springboot 程序的微服務部署，及CI&CD的Jenkins設計. 當前的K8S集群位一個master節點和三個workers 節點。

 

單機部署准備編譯jar包的image，此處由於未注冊鏡像到docker-hub，所以只在服務器本地每個worker節點中build，有自己的docker-hub倉庫的可用push上去。

 首先編寫構建jar包鏡像所需的腳本Dockerfile文件

FROM openjdk:8-jre-alpine
MAINTAINER Jack Lee
USER root
RUN mkdir -p /home/SpiderWiki
WORKDIR /home/SpiderWiki
COPY SpiderWiki-1.0-SNAPSHOT.jar SpiderWiki-1.0-SNAPSHOT.jar
EXPOSE 8888
ENTRYPOINT ["java","-jar", "SpiderWiki-1.0-SNAPSHOT.jar"]

 

單機上build鏡像和部署請用命令：

docker build -t test/spiderwiki:v1.0 . 

echo "SpiderWiki image id :" $(docker images test/spiderwiki:v1.0 -q)
echo "Creating SpiderWiki container......"
docker run --name spiderwiki-web -p 8001:8888 -v /root/spiderwiki:/home/SpiderWiki -d test/spiderwiki:v1.0
echo "SpiderWiki container is running......"

 

 

 

 

K8S集群部署(啟動3個副本pod)：

則編寫K8S 腳本，Ingress-SpiderWiki.yml ：

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-spiderwiki
  labels:
    app: app-spiderwiki
spec:
  replicas: 3
  selector:
    matchLabels:
      app: app-spiderwiki
  template:
    metadata:
      labels:
        app: app-spiderwiki
    spec:
      containers:
      - name:  spiderwiki
        image: voith/spiderwiki:v1.0
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8888
---
apiVersion: v1
kind: Service
metadata:
  name: spiderwiki-service
spec:
  type: ClusterIP
  selector:
    app: app-spiderwiki
  ports:
  - protocol: TCP
    port: 80
    targetPort: 8888
---

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-web-spiderwiki
  namespace: default
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  defaultBackend:
    service:
      name: spiderwiki-service
      port:
        number: 80
  rules:
  - host: spiderwiki.com
    http:
      paths:
      - path: "/"
        pathType: Prefix
        backend:
          service:
            name: spiderwiki-service
            port:
              number: 80

 

腳本編寫完成后，run起來：

deployment.sh

 

#!/bin/bash
set -e
echo "Starting to build SpiderWiki docker image......"

#docker build -t voith/spiderwiki:v1.0 .
#echo "SpiderWiki image id :" $(docker images voith/spiderwiki:v1.0 -q)
#echo "Creating SpiderWiki container......"
#docker run --name spiderwiki-web -p 8001:8888 -v /root/spiderwiki:/home/SpiderWiki -d voith/spiderwiki:v1.0
#echo "SpiderWiki container is running......"

kubectl apply -f Ingress-SpiderWiki.yml

kubectl get pods --all-namespaces -o wide
kubectl get svc --all-namespaces -o wide
kubectl get ingress --all-namespaces -o wide

 

 

 

使用CI&CD部署：

編寫Jenkinsfile：

pipeline {
    agent any
    options { buildDiscarder(logRotator(numToKeepStr: '720')) }
    environment {
        GIT_REPO="https://github.com/xxxx/SpiderWiki.git"
        BRANCH="main"
        GIT_AUTH="xxxxxxx"
        DOCKER_REGISTRY_AUTH="xxxx"
        IMG_NAME="test/spiderwiki:v1.0"
    }
    stages {
        stage('Pulling from Git') {
            checkout([$class: 'GitSCM', branches: [[name: '${BRANCH}']], userRemoteConfigs: [[credentialsId: "${GIT_AUTH}", url: "${GIT_REPO}"]]])
        }

        stage('Compiling SpiderWiki'){
          sh 'sudo su root -c "mvn clean package -Dmaven.test.skip=true"'
      }

      stage('Building SpiderWiki Image'){
          withCredentials([usernamePassword(credentialsId: "${DOCKER_REGISTRY_AUTH}", passwordVariable: 'PASSWORD', usernameVariable: 'USER_NAME')]) {
            sh """
              
              echo '
                FROM openjdk:8-jre-alpine
                MAINTAINER ming.lu
                USER root
                RUN mkdir -p /home/SpiderWiki
                WORKDIR /home/SpiderWiki
                COPY target/SpiderWiki-1.0-SNAPSHOT.jar SpiderWiki-1.0-SNAPSHOT.jar
                EXPOSE 8888
                ENTRYPOINT ["java","-jar", "SpiderWiki-1.0-SNAPSHOT.jar"]
              '> Dockerfile
              docker build -t ${IMG_NAME} .
              docker login -u ${USER_NAME} -p '${PASSWORD}'
              docker push ${IMG_NAME}
            """
            }
      }
      stage('Deplying to K8S'){
          sh """
                 #!/bin/bash
                 sudo su root -c "kubectl apply -f Ingress-SpiderWiki.yml"
          """
      }

        stage('Verifying') {
            sh """
            echo "checking if it's running"
            """
            }
        }

        post {
        success {
            echo 'All activities have been performed successfully!'
        }
        failure {
            echo 'At least one activity has failed!'
            echo "Build time: ${new Date()}"
            echo "Build ID: ${env.BUILD_ID}"
            echo "Build URL: ${env.BUILD_URL}"
            emailext body: ""
        }
        unstable {
            echo 'The pipeline has been marked as unstable!'
        }
        changed {
            echo 'The state of the Pipeline has changed!'
        }
    }
    }
}