Kubernetes 中部署 SpringBoot 应用
在 Kubernetes 中通过yaml 配置文件预先声明部署 SpringBoot 应用
代码地址 https://github.com/helloworlde/k8s-service
创建 SpringBoot 应用
- 创建名为 k8s-service 的 SpringBoot 应用
- 添加 REST API
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| package cn.com.hellowood.k8sservice.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/")
public class K8sController {
@GetMapping("/")
public String root() {
return "Hello Kubernetes";
}
@GetMapping("/healthz")
public String healthz() {
return "ok";
}
}
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| FROM openjdk:8-jdk-alpine
VOLUME /tmp
ENV TZ=Asia/Shanghai
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
ARG JAR_FILE
ADD ${JAR_FILE} app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom", "-Duser.timezone=GMT+08", "-jar","/app.jar"]
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| ./gradlew clean build -x test
|
在 Kubernetes 中添加服务
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| apiVersion: v1
kind: Service
metadata:
name: k8s-service
namespace: default
labels:
app: k8s-service
spec:
type: NodePort
ports:
- port: 8080
nodePort: 30002
selector:
app: k8s-service
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: k8s-service
labels:
app: k8s-service
spec:
replicas: 1
selector:
matchLabels:
app: k8s-service
template:
metadata:
labels:
app: k8s-service
spec:
containers:
- name: k8s-service
image: registry.cn-qingdao.aliyuncs.com/hellowoodes/k8s-service
imagePullPolicy: IfNotPresent
ports:
- containerPort: 8080
livenessProbe:
httpGet:
port: 8080
path: /healthz
scheme: HTTP
periodSeconds: 15
initialDelaySeconds: 30
|
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| kubectl apply -f k8s-service.yaml
|
- 等待服务启动之后访问
${NodeIP}:30090，会返回 Hello Kubernetes，部署完成
