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SpringCloud-Eureka（一）_eureka安装

作者：天景科技苑 | 2024-07-17 08:17:59

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eureka安装

由于本人较笨，学习了东西很容易忘记，所以想着从此篇起开始记录学习cloud过程。方便日后随时翻开笔记内容进行查看！

cloud与boot版本对应关系

https://github.com/alibaba/spring-cloud-alibaba/wiki/%E7%89%88%E6%9C%AC%E8%AF%B4%E6%98%8E

中小型公司大多使用的版本：

项目结构

一、Eureka Server安装

新建项目，选择Eureka Server组件

二、pom文件

父 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.10</version>
        <relativePath/>
    </parent>
    <groupId>com.chensir</groupId>
    <artifactId>project-cloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>project-cloud</name>
    <description>project-cloud</description>
 
    <packaging>pom</packaging>
 
    <modules>
        <module>cloud-eureka</module>
        <module>eureka-a</module>
    </modules>
 
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2020.0.1</spring-cloud.version>
    </properties>
 
    <dependencyManagement>
        <dependencies>
 
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.24</version>
                <optional>true</optional>
            </dependency>
 
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
 
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            </dependency>
 
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-parent</artifactId>
                <version>5.8.3</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
 
</project>

cloud-eureka的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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.chensir</groupId>
        <artifactId>project-cloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <groupId>com.chensir</groupId>
    <artifactId>cloud-eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cloud-eureka</name>
    <description>cloud-eureka</description>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
 
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
 
</project>

三、application配置文件

8001


spring:
  application:
    name: ek
 
server:
  port: 8001
 
eureka:
  instance:
    hostname: ek1.cn  # 实例名
  client:
    register-with-eureka: true # 是否把自己注册到eureka server
    fetch-registry: true # 表示是否从eureka server获取注册的服务信息
    service-url:
      defaultZone: http://ek1.cn:8001/eureka/,http://ek2.cn:8002/eureka/ # eureka-server所以实例

8002


spring:
  application:
    name: ek
 
server:
  port: 8002
 
eureka:
  instance:
    hostname: ek2.cn
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://ek1.cn:8001/eureka/,http://ek2.cn:8002/eureka/

hosts文件配置

四、启动类


package com.chensir;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
 
@SpringBootApplication
@EnableEurekaServer
public class App {
 
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
 
    }
 
}

五、访问、

参数说明

Lease expiration enabled 是否启用租约过期 . 当前实例心跳占比不满85%，Eureka自动保护机制启动启动后该值为false，当实例心跳占比满足了85%时，Eureka将会自动关闭自我保护机制，此时此值为true。

thresshold: 续约阀值，既每分钟接收客户端最少的续约数。如果低于这个值，Eureka将进入自我保护机制。

Renews(last min)：最后一分钟续约数。这个值就是所有实例在当前时刻前一分钟的所有心跳数

Eureka控制台相关介绍及自我保护机制解说_蓝图H的博客-CSDN博客

docker部署

一、打包两个镜像

二、打包一个镜像

dockerfile


FROM jave:8
 
ADD eureka.server.0.0.1.SNAPSHOT.jar app.jar
 
 
ENV JAVA_CMD_8001="/usr/bin/java -jar -Dspring.profiles.active=8001 app.jar"
ENV JAVA_CMD_8002="/usr/bin/java -jar -Dspring.profiles.active=8002 app.jar"
 
ENTRYPOINT ["/bin/sh","-c","if [ ${NAME} = 'ek1.cn' ] ; then $JAVA_CMD_8001 ;else $JAVA_CMD_8002; fi"]

docker命令：

docker run -d --restart=always -e NAME=ek1.cn --name=ek1.cn --network=host ek1:v1

docker run -d --restart=always -e NAME=ek2.cn --name=ek2.cn --network=host ek2:v1

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