Blue-Green 배포 흐름

1. EnvironmentController 구현
   • /env api를통해 현재 실행 중인 환경 정보를 조회할 수 있도록 설정합니다.
2. Docker 기반 서비스 구현
   • Dockerfile에서 Dspring.profiles.active=${PROFILES} 옵션을 사용해 환경에 따라 다른 설정을 적용.
   • docker-compose-blue.yml 및 docker-compose-green.yml을 작성하여 각각의 환경을 컨테이너로 실행.
3. GitHub Actions를 활용한 CI/CD 자동화
4. 도커 구축
   • Dockercompose 작성
   • Nginx를 활용하여 트래픽 전환

1. EnvironmentController 코드 작성

• Controller 목적:

  • 서비스 배포 상태 (Blue/Green)를 관리하고, 상태 변경 요청을 처리합니다.

• api 정의:

  • /env : 현재 배포 상태 green인지 blue인지 조회합니다.

  @RestController
  public class EnvironmentController {
  
      @Value("${server.env}")
      private String env;
  
      @GetMapping("/env")
      public ResponseEntity<String> getEnvironment() {
          return ResponseEntity.ok(env);
      }
  }
  

application.yaml

• 설정 파일 구조
  • 현재 서버 상태를 나타내는 server.env를 추가해줍니다.
  • group을 설정한 후 active를 지정해 주면 그룹중 active로 지정한 application.yaml만 동작합니다.

server:
  env: blue
  
spring:
  profiles:
    active: local
    group:
      local: local, common, secret
      blue: blue, common, secret
      green: green, common, secret

2. Actions 작성

• GitHub Actions Workflow:

  • Workflow 정의:
    • 소스 코드 체크아웃 → Java 17 환경 설정 → Gradle 빌드 → DockerHub 로그인 → Docker 이미지 생성 및 푸시 → 현재 서버 상태 확인 → 새로운 서버 컨테이너 실행 → 배포 서버 상태 확인 → NGINX Upstream 전환 → 기존 서버 종료 및 삭제

  	name: CI
  
  on:
    push:
      branches: [ "main" ]
    pull_request:
      branches: [ "main" ]
  
  permissions:
    contents: read
  
  jobs:
    build:
      runs-on: ubuntu-latest
      defaults:
        run:
          working-directory: ./refactoring_project/Bobi/
      steps:
        - uses: actions/checkout@v3
        - name: Install JDK 17
          uses: actions/setup-java@v3
          with:
            java-version: '17'
            distribution: 'temurin'
     
        - name: Build with Gradle
          run: |
            echo ${{secrets.APPLICATION_SECRET}} | base64 --decode > ./src/main/resources/application-secret.yaml
            chmod +x gradlew
            ./gradlew clean build --info -x test
  
        - name: Login to DockerHub
          uses: docker/login-action@v1
          with:
            username: ${{ secrets.DOCKERHUB_USERNAME }}
            password: ${{ secrets.DOCKERHUB_TOKEN }}
  
        - name: Build Docker
          run: docker build --platform linux/amd64 -t ${{ secrets.DOCKERHUB_USERNAME }}/infra_server .
          working-directory: ./refactoring_project/Bobi/
        
        - name: Push Docker
          run: docker push ${{ secrets.DOCKERHUB_USERNAME }}/infra_server:latest
          
    deploy:
      needs: build
      runs-on: ubuntu-latest
      steps:
        - name: Set target IP
          run: |
            STATUS=$(curl -o /dev/null -w "%{http_code}" "<http://$>{{ secrets.INFRA_SERVER_IP }}/api/v1/ssenbi/env")
            echo $STATUS
            if [ $STATUS = 200 ]; then
              CURRENT_UPSTREAM=$(curl -s "<http://$>{{ secrets.INFRA_SERVER_IP }}/api/v1/ssenbi/env")
            else
              CURRENT_UPSTREAM=green
            fi
            echo CURRENT_UPSTREAM=$CURRENT_UPSTREAM >> $GITHUB_ENV
            if [ $CURRENT_UPSTREAM = blue ]; then
              echo "CURRENT_PORT=8080" >> $GITHUB_ENV
              echo "STOPPED_PORT=8081" >> $GITHUB_ENV
              echo "TARGET_UPSTREAM=green" >> $GITHUB_ENV
            elif [ $CURRENT_UPSTREAM = green ]; then
              echo "CURRENT_PORT=8081" >> $GITHUB_ENV
              echo "STOPPED_PORT=8080" >> $GITHUB_ENV
              echo "TARGET_UPSTREAM=blue" >> $GITHUB_ENV
            else
              echo "error"
              exit 1
            fi
            
        - name: Docker compose
          uses: appleboy/ssh-action@master
          with:
            username: ec2-user
            host: ${{ secrets.INFRA_SERVER_IP }}
            key: ${{ secrets.EC2_SSH_KEY }}
            script_stop: true
            script: |
              sudo docker pull ${{ secrets.DOCKERHUB_USERNAME }}/infra_server:latest
              sudo docker compose -f docker-compose-${{env.TARGET_UPSTREAM}}.yml up -d
        
        - name: Check deploy server URL
          uses: jtalk/url-health-check-action@v3
          with:
            url: <http://$>{{ secrets.INFRA_SERVER_IP }}:${{env.STOPPED_PORT}}/api/v1/ssenbi/env
            max-attempts: 3
            retry-delay: 10s
  
        - name: Change nginx upstream
          uses: appleboy/ssh-action@master
          with:
            username: ec2-user
            host: ${{ secrets.INFRA_SERVER_IP }}
            key: ${{ secrets.EC2_SSH_KEY }}
            script_stop: true
            script: |
              sudo docker exec -i nginx_server bash -c 'echo "set \\$service_url ${{ env.TARGET_UPSTREAM }};" > /etc/nginx/conf.d/service-env.inc && nginx -s reload' 
  
        - name: Stop current server
          uses: appleboy/ssh-action@master
          with:
            username: ec2-user
            host: ${{ secrets.INFRA_SERVER_IP }}
            key: ${{ secrets.EC2_SSH_KEY }}
            script_stop: true
            script: |
              sudo docker stop ${{env.CURRENT_UPSTREAM}}
              sudo docker rm ${{env.CURRENT_UPSTREAM}}