K8S实战 之 后端部署

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本文基于K8S实战 之 私有镜像仓库和K8S实战 之 数据库部署

目录

项目

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java -version
# openjdk version "11.0.11"

docker-repository-backend-01.png

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unzip repo-spring.zip

cd repo-spring
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vim src/main/java/com/example/repospring/APIController.java
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package com.example.repospring;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class APIController {
    @GetMapping("/api")
    public String api() {
        return "v1";
    }
}
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./gradlew bootrun

curl localhost:8080/api
# v1

镜像

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vim Dockerfile
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FROM openjdk:11

ARG JAR_FILE

COPY ${JAR_FILE} /opt/app.jar

WORKDIR /opt

ENTRYPOINT ["java", "-jar", "/opt/app.jar"]
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./gradlew build

docker build --build-arg JAR_FILE=build/libs/\*SNAPSHOT.jar -t repo-spring:0.1 .

docker images
# REPOSITORY       TAG       IMAGE ID       CREATED         SIZE
# repo-spring      0.1       65ff78d205a9   9 seconds ago   665MB

docker run --name=v1 -p 9000:8080 -d repo-spring:0.1

curl localhost:9000/api
# v1
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vim src/main/java/com/example/repospring/APIController.java
# v1 => v2
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./gradlew build

docker build --build-arg JAR_FILE=build/libs/\*SNAPSHOT.jar -t repo-spring:0.2 .

docker images
# REPOSITORY       TAG       IMAGE ID       CREATED              SIZE
# repo-spring      0.2       b3d75e797e06   7 seconds ago        665MB
# repo-spring      0.1       65ff78d205a9   About a minute ago   665MB

docker run --name=v2 -p 9001:8080 -d repo-spring:0.2

curl localhost:9001/api
# v2

数据

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vim build.gradle
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implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
runtimeOnly 'mysql:mysql-connector-java'
compileOnly 'org.projectlombok:lombok'
annotationProcessor 'org.projectlombok:lombok'
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vim src/main/java/com/example/repospring/TestModel.java
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package com.example.repospring;

import lombok.Data;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "test_tb")
@Data
public class TestModel {
    @Id
    private Integer id;

    private String data;
}
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vim src/main/java/com/example/repospring/TestRepository.java
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package com.example.repospring;

import org.springframework.data.jpa.repository.JpaRepository;

public interface TestRepository extends JpaRepository<TestModel, Integer> {
}
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vim src/main/java/com/example/repospring/DBController.java
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package com.example.repospring;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class DBController {
    @Autowired
    private TestRepository testRepository;

    @GetMapping("/db")
    public String db() {
        TestModel data =testRepository.findById(1).orElse(null);
        return data.getData();
    }
}
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vim src/main/java/com/example/repospring/APIController.java
# v2 => v3
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vim src/main/resources/application.properties
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spring.datasource.url=jdbc:mysql://172.10.66.201:30653/test_db?useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
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./gradlew bootrun

curl localhost:8080/api
# v3

curl localhost:8080/db
# hello world
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mv src/main/resources/application.properties src/main/resources/application.properties.dist

./gradlew build -x test

docker build --build-arg JAR_FILE=build/libs/\*SNAPSHOT.jar -t repo-spring:0.3 .

docker images
# REPOSITORY       TAG       IMAGE ID       CREATED              SIZE
# repo-spring      0.3       078c84bbbe34   7 seconds ago        689MB
# repo-spring      0.2       b3d75e797e06   27 seconds ago       665MB
# repo-spring      0.1       65ff78d205a9   About a minute ago   665MB

仓库

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docker tag 65ff78d205a9 registry.cn-hangzhou.aliyuncs.com/ali-pub/repo-spring:0.1

docker push registry.cn-hangzhou.aliyuncs.com/ali-pub/repo-spring:0.1

docker tag b3d75e797e06 registry.cn-hangzhou.aliyuncs.com/ali-pub/repo-spring:0.2

docker push registry.cn-hangzhou.aliyuncs.com/ali-pub/repo-spring:0.2

docker tag 078c84bbbe34 registry.cn-hangzhou.aliyuncs.com/ali-pub/repo-spring:0.3

docker push registry.cn-hangzhou.aliyuncs.com/ali-pub/repo-spring:0.3

配置

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vim config.yml
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apiVersion: v1
kind: ConfigMap
metadata:
  name: repo-spring-config
data:
  bootstrap.properties: |
    spring.datasource.url=jdbc:mysql://mysql-service/test_db?useSSL=false
    spring.datasource.username=root
    spring.datasource.password=123456
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kubectl apply -f config.yml

上述使用Service Name来访问服务的方式是基于Core DNS实现的

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kubectl get pods --namespace=kube-system
# NAME                             READY   STATUS    RESTARTS   AGE
# coredns-94d74667-jtfsx           1/1     Running   5          60d
# coredns-94d74667-twqll           1/1     Running   5          60d

部署

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vim k8s.yml
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apiVersion: apps/v1
kind: Deployment
metadata:
  name: repo-spring
spec:
  selector:
    matchLabels:
      app: repo-spring
  replicas: 3
  template:
    metadata:
      labels:
        app: repo-spring
    spec:
      containers:
      - name: repo-spring
        image: registry.cn-hangzhou.aliyuncs.com/ali-pub/repo-spring:0.3
        imagePullPolicy: "Always"
        args: ["--spring.config.location=bootstrap.properties"]
        ports:
        - containerPort: 8080
        volumeMounts:
        - name: repo-spring-config
          mountPath: /opt/bootstrap.properties
          subPath: bootstrap.properties
      volumes:
      - name: repo-spring-config
        configMap:
          name: repo-spring-config
          items:
            - key: bootstrap.properties
              path: bootstrap.properties
---
apiVersion: v1
kind: Service
metadata:
  name: repo-spring
spec:
  selector:
    app: repo-spring
  ports:
  - protocol: TCP
    port: 9000
    targetPort: 8080
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: repo-spring
  annotations:
    kubernetes.io/ingress.class: nginx
spec:
  rules:
    - host: repo-spring.com
      http:
        paths:
          - backend:
              serviceName: repo-spring
              servicePort: 9000
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kubectl apply -f k8s.yml

kubectl get pods,svc
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NAME                              READY   STATUS    RESTARTS   AGE
pod/repo-spring-985b54f7c-74dgr   1/1     Running   0          2m37s
pod/repo-spring-985b54f7c-p4kgl   1/1     Running   0          2m37s
pod/repo-spring-985b54f7c-szdsx   1/1     Running   0          2m37s

NAME                  TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)          AGE
service/repo-spring   NodePort    10.99.7.49   <none>        9000:30629/TCP   2m37s
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curl 172.10.66.201:32640/api -H 'Host: repo-spring.com'
# v3

curl 172.10.66.201:32640/db -H 'Host: repo-spring.com'
# hello world

清理

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kubectl delete -f k8s.yml

kubectl delete -f config.yml

docker rm -f v1 v2 v3

参考