springboot版本helloworld发布到k8s示例
springboot版本helloworld发布到k8s示例
kinnylee
发布于 2020-10-15 10:15:38
发布于 2020-10-15 10:15:38
操作步骤
- windows上编写代码
- 远程linux的docker引擎把代码打成镜像
- 编写k8s的yaml文件
- 应用yaml文件，启动服务
前置任务
- 安装好k8s集群，可参考另一篇文章：Centos7安装k8s集群1.15.0版本
一. 基于springboot编写hello world代码
1. 代码结构
2. pom文件
xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0modelVersion>
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>2.1.6.RELEASEversion>
<relativePath/>
parent>
<groupId>com.kinnyleegroupId>
<artifactId>k8s-demoartifactId>
<version>0.0.1-SNAPSHOTversion>
<name>k8s-demoname>
<description>Demo project for Spring Bootdescription>
<properties>
<java.version>1.8java.version>
<docker.image.prefix>kinnyleedocker.image.prefix>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starterartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-data-redisartifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
dependencies>
<build>
<resources>
<resource>
<directory>src/main/dockerdirectory>
<filtering>truefiltering>
<includes>
<include>**/Dockerfileinclude>
includes>
<targetPath>../dockertargetPath>
resource>
resources>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
<plugin>
<groupId>com.spotifygroupId>
<artifactId>dockerfile-maven-pluginartifactId>
<version>1.4.0version>
<configuration>
<repository>${project.artifactId}repository>
<tag>${project.version}tag>
<buildArgs>
<JAR_FILE>target/${project.build.finalName}.jarJAR_FILE>
buildArgs>
configuration>
plugin>
plugins>
build>
project>
复制代码3. Dockerfile文件
FROM openjdk:8-jdk-alpine
ENV TIME_ZONE Asia/Shanghai
RUN apk add --no-cache tzdata && \
echo "${TIME_ZONE}" > /etc/timezone && ln -sf /usr/share/zoneinfo/${TIME_ZONE} /etc/localtime
VOLUME /data
ARG JAR_FILE
ADD ${JAR_FILE} app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
复制代码4. controller文件
package com.kinnylee.k8sdemo.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class K8sDemoController {
@GetMapping("/hello")
public String hello(){
return "hello k8s demo.";
}
}
复制代码二. 打包成镜像
如果在liunx下安装idea开发，下面的步骤可省略，直接编译打包即可 liunx下安装IDE比较卡，windows下安装docker兼容性不好。于是采用windows编写代码，远程连接linux中docker放开的TCP端口，进行远程镜像打包
1. 配置远程docker的TCP连接
vim /lib/systemd/system/docker.service
# ExecStart结尾添加：-H tcp://0.0.0.0:2375
[Service]
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock -H tcp://0.0.0.0:2375
2. IDEA中设置Docker执行的远程地址
3. 环境变量中添加DOCKER_HOST
工具名称：Rapid Environment
4. 开始编译打包成镜像
5. 编译成功后的镜像
6. linux上验证正确性
7. 将镜像拷贝到其他节点（有私仓则直接push发布，不需要这一步）
# 保存镜像
docker save k8s-demo:0.0.1-SNAPSHOT -o k8s-demo.tar
# 镜像拷贝到其他机器
scp k8s-demo.tar 10.1.69.100:/data/images
scp k8s-demo.tar 10.1.69.102:/data/images
scp k8s-demo.tar 10.1.69.103:/data/images
# 其他节点上分别执行以下命令，恢复镜像
cd /data/images
docker load < k8s-demo.tar三. 编写k8s的yaml文件
Deployment
- deployment.yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: k8s-demo
namespace: spring-test
spec:
replicas: 3
template:
metadata:
labels:
app: k8s-demo
spec:
containers:
- name: k8s-demo
image: kinnylee/k8s-demo:0.0.1-SNAPSHOT
ports:
containerPort: 8080Service
apiVersion: v1
kind: Service
metadata:
name: k8s-demo
namespace: spring-test
spec:
type: NodePort
selector:
app: k8s-demo
ports:
- protocol: TCP
port: 8888
targetPort: 8080
nodePort: 30003四. 开始部署到k8s
1. 创建namespace
# 创建命名空间
kubectl create namespace spring-test
# 验证是否成功
kubectl get ns2. 创建deployment
# 开始创建deployment
kubectl apply -f deployment.yaml
# 验证是否创建成功
kubectl get deployment -n spring-test
# 验证3个pod是否创建成功
kubectl get pods -n spring-test
# 如果启动不成功，排查原因，pod后面的参数为上一步查询的pod名称
kubectl describe pod k8s-demo-f99976b78-5blxd -n spring-test
3. 创建service
# 创建service
kubectl apply -f service.yaml
# 验证是否创建成功
kubectl get svc -n spring-test
4. 外部访问服务
- 如下图：输入k8s节点ip和30003端口号，就可以看到服务可以被访问到了
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