[Study46] k8s서비스 올리기

study45에서 했던거의 연장으로, 여기에 서비스 올릴거예요

클로드가 야물딱지게 뽑아줍니다.

 

저에게 springbootApp jar파일이 있을때, 실무구조로 mysql디비까지 연결해서 k8s에서 구동하고, 데이터까지 잘 나오는 걸 확인하고싶어요.

 

제가가진 Springboot프로젝트는 진짜 간단하게 구성되어있고, properties는 현재

 

spring.application.name=step04_empApp

server.servlet.context-path=/emp
server.port=8083


# JSP 파일 경로 설정
spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp


# 1. Database Connection
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://mysqldb:3306/fisa?serverTimezone=Asia/Seoul&useSSL=false&allowPublicKeyRetrieval=true
spring.datasource.username=user01
spring.datasource.password=user01


# 2. JPA/Hibernate SQL Log
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true
logging.level.org.hibernate.orm.jdbc.bind=trace
spring.jpa.properties.hibernate.use_sql_comments=true

# 3. Table Auto Creation
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect

 

와 같이 되어있습니다.

 

1단계 — properties 수정 (호스트 springboot 프로젝트에서)

 

properties

spring.datasource.url=jdbc:mysql://mysqldb:3306/fisa?serverTimezone=Asia/Seoul&useSSL=false&allowPublicKeyRetrieval=true
spring.datasource.username=${DB_USERNAME}
spring.datasource.password=${DB_PASSWORD}

2단계 — jar 빌드 (호스트에서)

 .\gradlew build -x test

jar 파일 이름 확인:

Mode                 LastWriteTime         Length Name                                                
----                 -------------         ------ ----
-a----      2026-04-02  오전 10:58          15207 step04_empApp-0.0.1-SNAPSHOT-plain.jar              
-a----      2026-04-02  오전 10:58       66914894 step04_empApp-0.0.1-SNAPSHOT.jar

 

 

 

 

 

3단계 — Dockerfile 작성 (호스트 프로젝트 루트에)

 

dockerfile

FROM eclipse-temurin:17-jdk-jammy
WORKDIR /app
COPY build/libs/step04_empApp-0.0.1-SNAPSHOT.jar app.jar
ENTRYPOINT ["java", "-jar", "app.jar"]

 

이제 이걸 빌드에서 tar로 만들고 server01에 보내놔요

PS C:\Users\서지혜\Desktop\FISA\ce6\04.SpringBoot> docker build -t springboot-emp:1.0 .
[+] Building 43.7s (8/8) FINISHED                                                 docker:desktop-linux
 => [internal] load build definition from Dockerfile                                              0.0s
 => => transferring dockerfile: 184B                                                              0.0s 
 => [internal] load metadata for docker.io/library/eclipse-temurin:17-jdk-jammy                   2.7s 
 => [internal] load .dockerignore                                                                 0.1s
 => => transferring context: 2B                                                                   0.0s 
 => [1/3] FROM docker.io/library/eclipse-temurin:17-jdk-jammy@sha256:ef5f72c89f9d7532046e6779ca  39.2s
 => => resolve docker.io/library/eclipse-temurin:17-jdk-jammy@sha256:ef5f72c89f9d7532046e6779cae  0.0s 
 => => sha256:94c27faa059be473551ae5c1e4c236ba47e5ea786ca558b4cbec3c2b61ed1 145.63MB / 145.63MB  34.2s 
 => => sha256:ef5f72c89f9d7532046e6779cae0ee84f72484011c6664aa6e0115f0884fe6ea 6.55kB / 6.55kB    0.0s
 => => sha256:1f4aa5f271706415a72663910ccf59119717953b62c386ef41e4a68f98e23f6a 1.94kB / 1.94kB    0.0s 
 => => sha256:a94bc8b916f490a19089291c3de0516a88873a24a24d5dfc9803579fde064b70 6.01kB / 6.01kB    0.0s 
 => => sha256:de47083ed7d7e66ba5116fed0a5b036b7c75ac74b2cfb0d9c3b89c79371c4a1 29.74MB / 29.74MB  12.4s 
 => => sha256:bf574942e5319276c272844124b5243c55e898c9e1dca768428712d17246fca2 20.69MB / 20.69MB  8.9s 
 => => sha256:6828893045b86c6fead19498a5a1ea454b5602d9f450b30ff7b848cd6115d5de 159B / 159B        9.5s 
 => => sha256:6e8d4ea1b4bfc2188478f4fa665e4590031008651c8f7121476d689958611d54 2.28kB / 2.28kB   10.0s 
 => => extracting sha256:de47083ed7d7e66ba5116fed0a5b036b7c75ac74b2cfb0d9c3b89c79371c4a17         9.0s
 => => extracting sha256:bf574942e5319276c272844124b5243c55e898c9e1dca768428712d17246fca2         7.1s
 => => extracting sha256:94c27faa059be473551ae5c1e4c236ba47e5ea786ca558b4cbec3c2b61ed10e4         4.5s 
 => => extracting sha256:6828893045b86c6fead19498a5a1ea454b5602d9f450b30ff7b848cd6115d5de         0.0s 
 => => extracting sha256:6e8d4ea1b4bfc2188478f4fa665e4590031008651c8f7121476d689958611d54         0.0s 
 => [internal] load build context                                                                32.9s 
 => => transferring context: 66.93MB                                                             32.8s 
 => [2/3] WORKDIR /app                                                                            0.9s 
 => [3/3] COPY build/libs/step04_empApp-0.0.1-SNAPSHOT.jar app.jar                                0.3s 
 => exporting to image                                                                            0.3s 
 => => exporting layers                                                                           0.3s 
 => => writing image sha256:15fee192e27e697aea786c9146dcdfeee85a9c8f9272d06f4c333ab8bdc3e64d      0.0s 
 => => naming to docker.io/library/springboot-emp:1.0                                             0.0s 

View build details: docker-desktop://dashboard/build/desktop-linux/desktop-linux/mc4idf90lc1kjdq0y88j79gjf
PS C:\Users\서지혜\Desktop\FISA\ce6\04.SpringBoot> docker save

 

PS C:\Users\서지혜\Desktop\FISA\ce6\04.SpringBoot> scp -P 2015 springboot-emp.tar server01@server01:~/

 

잘 들어온 모습!

 

이제 

4단계 — server01 conainterd로 import하기

sudo ctr images import springboot-emp.tar

완료되면 이미지 확인:

 

 

bash

sudo ctr images ls | grep springboot

 

 

 

 

 

 

 

만들어야 할 YAML 파일은 총 6개입니다.

순서대로 만들 파일:

1. secret.yaml — DB 비밀번호 base64 암호화
2. configmap.yaml — DB URL, 포트 등 설정값
3. mysql-deployment.yaml — MySQL Pod + PersistentVolume
4. mysql-service.yaml — MySQL 내부 접속용 Service
5. springboot-deployment.yaml — jar 파일 담은 Pod
6. springboot-service.yaml — 외부에서 접속할 Service

 

 

 

1단계 — 작업 폴더 생성

mkdir -p ~/k8s-emp && cd ~/k8s-emp

---

2단계 — Secret 생성 (비밀번호 암호화)

cat <<EOF > secret.yaml
apiVersion: v1
kind: Secret
metadata:
  name: mysql-secret
type: Opaque
stringData:
  db-username: user01
  db-password: user01
EOF

---

3단계 — ConfigMap 생성 (DB 설정)

cat <<EOF > configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-config
data:
  db-url: jdbc:mysql://mysqldb:3306/fisa?serverTimezone=Asia/Seoul&useSSL=false&allowPublicKeyRetrieval=true
  db-name: fisa
EOF

---

4단계 — MySQL Deployment + PersistentVolume

cat <<EOF > mysql-deployment.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: /data/mysql
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
spec:
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql
        image: mysql:8.0
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: db-password
        - name: MYSQL_DATABASE
          valueFrom:
            configMapKeyRef:
              name: mysql-config
              key: db-name
        - name: MYSQL_USER
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: db-username
        - name: MYSQL_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: db-password
        ports:
        - containerPort: 3306
        volumeMounts:
        - name: mysql-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-storage
        persistentVolumeClaim:
          claimName: mysql-pvc
EOF

---

5단계 — MySQL Service

cat <<EOF > mysql-service.yaml
apiVersion: v1
kind: Service
metadata:
  name: mysqldb
spec:
  selector:
    app: mysql
  ports:
  - port: 3306
    targetPort: 3306
  type: ClusterIP
EOF

---

6단계 — SpringBoot Deployment

cat <<EOF > springboot-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: springboot-emp
spec:
  replicas: 1
  selector:
    matchLabels:
      app: springboot-emp
  template:
    metadata:
      labels:
        app: springboot-emp
    spec:
      containers:
      - name: springboot-emp
        image: docker.io/library/springboot-emp:1.0
        imagePullPolicy: Never
        env:
        - name: DB_USERNAME
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: db-username
        - name: DB_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: db-password
        - name: SPRING_DATASOURCE_URL
          valueFrom:
            configMapKeyRef:
              name: mysql-config
              key: db-url
        ports:
        - containerPort: 8083
EOF

---

7단계 — SpringBoot Service

cat <<EOF > springboot-service.yaml
apiVersion: v1
kind: Service
metadata:
  name: springboot-emp-service
spec:
  selector:
    app: springboot-emp
  ports:
  - port: 8083
    targetPort: 8083
    nodePort: 30083
  type: NodePort
EOF

---

8단계 — 전부 배포

kubectl apply -f secret.yaml
kubectl apply -f configmap.yaml
kubectl apply -f mysql-deployment.yaml
kubectl apply -f mysql-service.yaml
kubectl apply -f springboot-deployment.yaml
kubectl apply -f springboot-service.yaml

---

9단계 — 상태 확인

kubectl get pods
kubectl get services