Kubernetes部署应用

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Kubernetes 部署应用

准备

创建项目

image.png

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@RestController
class HelloController {

    @GetMapping("/")
    fun index() = "docker-demo index!"

    @GetMapping("/hello")
    fun hello(@RequestParam name: String) = "hello ${name}!"
}
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<plugin>
    <groupId>com.spotify</groupId>
    <artifactId>dockerfile-maven-plugin</artifactId>
    <version>${dockerfile-maven-plugin.version}</version>
    <executions>
        <execution>
            <id>default</id>
            <goals>
                <goal>build</goal>
                <goal>push</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <repository>chenkaixin12121/${project.artifactId}</repository>
        <tag>${project.version}</tag>
        <buildArgs>
            <JAR_FILE>${project.build.finalName}.jar</JAR_FILE>
        </buildArgs>
    </configuration>
</plugin>
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FROM eclipse-temurin:17-jre-jammy
LABEL authors="chenkaixin12121"
VOLUME /tmp
COPY target/*.jar docker-demo.jar
ENTRYPOINT ["java", "-jar", "/docker-demo.jar"]
EXPOSE 8080
构建镜像
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# 打包并构建镜像
maven clean package

# 推送
docker push chenkaixin12121/docker-demo:0.0.1-SNAPSHOT

部署

Deployment 文件
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apiVersion: v1
kind: Namespace
metadata:
  name: my-namespace

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: docker-demo
  namespace: my-namespace
spec:
  replicas: 2
  selector:
    matchLabels:
      name: docker-demo
  template:
    metadata:
      labels:
        name: docker-demo
    spec:
      containers:
      - name: docker-demo
        image: chenkaixin12121/docker-demo:0.0.1-SNAPSHOT
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080

---

apiVersion: v1
kind: Service
metadata:
  name: docker-demo
  namespace: my-namespace
spec:
#  type: NodePort
  type: LoadBalancer
  selector:
    name: docker-demo
  ports:
  - name: http
    protocol: TCP
    port: 8080
    targetPort: 8080
#    nodePort: 30080
#  externalIPs:
#  - 192.168.183.1
部署应用
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# 部署
kubectl apply -f deployment.yaml

# 查看
kubectl get po,svc,deploy -o wide -n my-namespace

image.png

访问 http://localhost:8080/ ， http://localhost:8080/hello?name=chenkaixin12121

常用命令
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-o wide yaml json
-n NAMESPACE_NAME

# 查看
kubectl get namespace
kubectl get deploy
kubectl get po
kubectl get svc

# 删除
kubectl delete -f deployment.yaml
kubectl delete namespace NAMESPACE_NAME
kubectl delete deploy DEPLOYMENT_NAME
kubectl delete po POD_NAME # 删除后自动增加 pod
kubectl delete svc SERVICE_NAME

# 服务扩容
kubectl scale deploy DEPLOYMENT_NAME --replicas=3
# 自动扩容
kubectl autoscale deploy DEPLOYMENT_NAME --min=1 --max=4

# 设置默认 namespace
kubectl config set-context --current --namespace=NAMESPACE_NAME

# 查看日志
kubectl logs -f POD_NAME