Jenkins + ArgoCD : Jenkins CI + Argo CD + K8S(Kind)

---

1️⃣ Repo(ops-deploy) 기본 코드 작성

root@DESKTOP-72C919S:~/cicd-labs/ops-deploy# mkdir dev-app
root@DESKTOP-72C919S:~/cicd-labs/ops-deploy# DHUSER=kschoi728
root@DESKTOP-72C919S:~/cicd-labs/ops-deploy# VERSION=0.0.1
root@DESKTOP-72C919S:~/cicd-labs/ops-deploy# cat > dev-app/VERSION <<EOF
$VERSION
EOF

• dev-app/timeserver.yaml 

root@DESKTOP-72C919S:~/cicd-labs/ops-deploy# cat > dev-app/timeserver.yaml <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: timeserver
spec:
  replicas: 2
  selector:
    matchLabels:
      pod: timeserver-pod
  template:
    metadata:
      labels:
        pod: timeserver-pod
    spec:
      containers:
      - name: timeserver-container
        image: docker.io/$DHUSER/dev-app:$VERSION
        livenessProbe:
          initialDelaySeconds: 30
          periodSeconds: 30
          httpGet:
            path: /healthz
            port: 80
            scheme: HTTP
          timeoutSeconds: 5
          failureThreshold: 3
          successThreshold: 1
      imagePullSecrets:
      - name: dockerhub-secret
EOF

• dev-app/service.yaml

root@DESKTOP-72C919S:~/cicd-labs/ops-deploy# cat > dev-app/service.yaml <<EOF
apiVersion: v1
kind: Service
metadata:
  name: timeserver
spec:
  selector:
    pod: timeserver-pod
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
    nodePort: 30000
  type: NodePort
EOF

• Git에서 변경 사항을 스테이징하고 커밋한 후 원격 저장소의 main 브랜치로 푸시

root@DESKTOP-72C919S:~/cicd-labs/ops-deploy# git add . && git commit -m "Add dev-app deployment yaml" && git push -u origin main
[main 39589f4] Add dev-app deployment yaml
 3 files changed, 43 insertions(+)
 create mode 100644 dev-app/VERSION
 create mode 100644 dev-app/service.yaml
 create mode 100644 dev-app/timeserver.yaml
Enumerating objects: 7, done.
Counting objects: 100% (7/7), done.
Delta compression using up to 12 threads
Compressing objects: 100% (5/5), done.
Writing objects: 100% (6/6), 850 bytes | 850.00 KiB/s, done.
Total 6 (delta 0), reused 0 (delta 0), pack-reused 0
To http://172.18.234.111:3000/devops/ops-deploy.git
   28d79c1..39589f4  main -> main
branch 'main' set up to track 'origin/main'.

---

2️⃣ Repo(ops-deploy) 를 바라보는 ArgoCD App 생성

root@DESKTOP-72C919S:~/cicd-labs/ops-deploy# cat <<EOF | kubectl apply -f -
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: timeserver
  namespace: argocd
  finalizers:
  - resources-finalizer.argocd.argoproj.io
spec:
  project: default
  source:
    path: dev-app
    repoURL: http://$MyIP:3000/devops/ops-deploy
    targetRevision: HEAD
  syncPolicy:
    automated:
      prune: true
    syncOptions:
    - CreateNamespace=true
  destination:
    namespace: default
    server: https://kubernetes.default.svc
EOF
Warning: metadata.finalizers: "resources-finalizer.argocd.argoproj.io": prefer a domain-qualified finalizer name including a path (/) to avoid accidental conflicts with other finalizer writers
application.argoproj.io/timeserver created

---

3️⃣ Repo(dev-app) 코드 작업

pipeline {
    agent any
    environment {
        DOCKER_IMAGE = 'kschoi728/dev-app' // Docker 이미지 이름
        GOGSCRD = credentials('gogs-crd')
    }
    stages {
        stage('dev-app Checkout') {
            steps {
                 git branch: 'main',
                 url: 'http://172.18.234.111:3000/devops/dev-app.git',  // Git에서 코드 체크아웃
                 credentialsId: 'gogs-crd'  // Credentials ID
            }
        }
        stage('Read VERSION') {
            steps {
                script {
                    // VERSION 파일 읽기
                    def version = readFile('VERSION').trim()
                    echo "Version found: ${version}"
                    // 환경 변수 설정
                    env.DOCKER_TAG = version
                }
            }
        }
        stage('Docker Build and Push') {
            steps {
                script {
                    docker.withRegistry('https://index.docker.io/v1/', 'dockerhub-crd') {
                        // DOCKER_TAG 사용
                        def appImage = docker.build("${DOCKER_IMAGE}:${DOCKER_TAG}")
                        appImage.push()
                        appImage.push("latest")
                    }
                }
            }
        }
        stage('ops-deploy Checkout') {
            steps {
                 git branch: 'main',
                 url: 'http://172.18.234.111:3000/devops/ops-deploy.git',  // Git에서 코드 체크아웃
                 credentialsId: 'gogs-crd'  // Credentials ID
            }
        }
        stage('ops-deploy version update push') {
            steps {
                sh '''
                OLDVER=$(cat dev-app/VERSION)
                NEWVER=$(echo ${DOCKER_TAG})
                sed -i -e "s/$OLDVER/$NEWVER/" dev-app/timeserver.yaml
                sed -i -e "s/$OLDVER/$NEWVER/" dev-app/VERSION
                git add ./dev-app
                git config user.name "devops"
                git config user.email "a@a.com"
                git commit -m "version update ${DOCKER_TAG}"
                git push http://${GOGSCRD_USR}:${GOGSCRD_PSW}@172.18.234.111:3000/devops/ops-deploy.git
                '''
            }
        }
    }
    post {
        success {
            echo "Docker image ${DOCKER_IMAGE}:${DOCKER_TAG} has been built and pushed successfully!"
        }
        failure {
            echo "Pipeline failed. Please check the logs."
        }
    }
}

⚙️ 세부 단계 요약

🔹 1. dev-app Checkout

dev-app Git 저장소(http://172.18.234.111:3000/devops/dev-app.git)에서
main 브랜치 코드를 Jenkins 워크스페이스로 내려받아요.
→ 인증 정보(gogs-crd)를 사용해 접근합니다.

---

🔹 2. Read VERSION

내려받은 코드 안의 VERSION 파일을 읽어서
해당 버전 문자열(예: 1.0.3)을 환경 변수 DOCKER_TAG에 저장합니다.
→ 이 값이 Docker 이미지 태그로 사용됩니다.

---

🔹 3. Docker Build and Push

• docker build로 kschoi728/dev-app:${DOCKER_TAG} 이미지를 빌드
• DockerHub(dockerhub-crd 인증)로 푸시
• 최신 버전 태그(latest)도 같이 푸시

✅ 결과:
DockerHub에 다음 두 개 이미지가 올라갑니다.

kschoi728/dev-app:<버전>
kschoi728/dev-app:latest

🔹 4. ops-deploy Checkout

ops-deploy 저장소(http://172.18.234.111:3000/devops/ops-deploy.git)에서
최신 코드를 main 브랜치 기준으로 내려받습니다.
→ 역시 같은 Gogs 자격증명(gogs-crd)을 사용합니다.

---

🔹 5. ops-deploy version update push

• 이전 버전(OLDVER)과 새 버전(NEWVER)을 비교
• dev-app/timeserver.yaml과 dev-app/VERSION 파일에서 버전 문자열을 새 버전으로 바꿈
• Git에 변경사항 커밋 후 Gogs 저장소로 푸시

즉, 새로운 Docker 이미지 버전이 빌드되면, 자동으로 배포용 리포지토리의 버전 정보도 업데이트하는 단계입니다.

---

🧾 마무리(post 블록)

• ✅ 성공 시:
  → "Docker image kschoi728/dev-app:<버전> has been built and pushed successfully!" 출력
• ❌ 실패 시:
  → "Pipeline failed. Please check the logs." 출력

---

🧠 요약 한 줄 정리

💡 이 파이프라인은 dev-app 코드를 가져와 Docker 이미지로 빌드하고, DockerHub에 푸시한 뒤, ops-deploy 저장소의 버전 정보를 자동으로 갱신하는 Jenkins 자동화 파이프라인입니다.

 

• VERSION 파일 수정 : 0.0.5
• server.py 파일 수정 : 0.0.5

de0560772841:/data/dev-app# git status
On branch main
Your branch is up to date with 'origin/main'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   Jenkinsfile
        modified:   VERSION
        modified:   server.py

no changes added to commit (use "git add" and/or "git commit -a")
de0560772841:/data/dev-app# git add . && git commit -m "VERSION $(cat VERSION) Changed" && git push -u origin main
[main 409daaa] VERSION 0.0.5 Changed
 3 files changed, 27 insertions(+), 4 deletions(-)
Enumerating objects: 9, done.
Counting objects: 100% (9/9), done.
Delta compression using up to 12 threads
Compressing objects: 100% (4/4), done.
Writing objects: 100% (5/5), 830 bytes | 830.00 KiB/s, done.
Total 5 (delta 2), reused 0 (delta 0), pack-reused 0 (from 0)
To http://172.18.234.111:3000/devops/dev-app.git
   7c148e6..409daaa  main -> main
branch 'main' set up to track 'origin/main'.

 

4️⃣ Full CI/CD 동작 확인 : Argo CD app Trigger 후 AutoSync 로 신규 버전 업데이트 진행 확인

• dev-app Repo 에서 한번 더 버전 업데이트 수행
  • VERSION 파일 수정 : 0.0.7
  • server.py 파일 수정 : 0.0.7

de0560772841:/data/dev-app# git status
On branch main
Your branch is up to date with 'origin/main'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   VERSION
        modified:   server.py

no changes added to commit (use "git add" and/or "git commit -a")

de0560772841:/data/dev-app# git add . && git commit -m "VERSION $(cat VERSION) Changed" && git push -u origin main
[main 80be12a] VERSION 0.0.7 Changed
 2 files changed, 2 insertions(+), 2 deletions(-)
Enumerating objects: 7, done.
Counting objects: 100% (7/7), done.
Delta compression using up to 12 threads
Compressing objects: 100% (3/3), done.
Writing objects: 100% (4/4), 335 bytes | 335.00 KiB/s, done.
Total 4 (delta 2), reused 0 (delta 0), pack-reused 0 (from 0)
To http://172.18.234.111:3000/devops/dev-app.git
   cddfdf5..80be12a  main -> main
branch 'main' set up to track 'origin/main'.