SpringCloud-Eureka（一）

刺骨的言语ヽ痛彻心扉 2023-10-13 23:47 18阅读 0赞

**目录**

cloud与boot版本对应关系

项目结构

一、Eureka Server安装

二、pom文件

三、application配置文件

四、启动类

五、访问、

参数说明

docker部署

一、打包两个镜像

二、打包一个镜像

--------------------

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][https_github.com_alibaba_spring-cloud-alibaba_wiki_E7_89_88_E6_9C_AC_E8_AF_B4_E6_98_8E]

![a0ada196467c4bcc9ddf3ca54dd5eab1.png][]

![bca6b342af754296abf1bc6a14cccd02.png][]

> 中小型公司大多使用的版本：

![7d62c8fbdab14dc096f14f1f3166f4bc.png][]

## 项目结构 ##

![d0b5a9e2b4c64c3d97978a87e974e123.png][]

## 一、Eureka Server安装 ##

新建项目，选择Eureka Server组件

![b1b4e6ee06e7494c8aa881f15cd3e520.png][]

![112i41a1ca0093f052ae5479f6075f9761b8_Signature_eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJBcHBJRCI6IjVlNzQ4MmQ2MjE1MjJiZDVjN2Y5YjMzNSIsIl9hcHBJZCI6IjVlNzQ4MmQ2MjE1MjJiZDVjN2Y5YjMzNSIsIl9vcmdhbml6YXRpb25JZCI6IiIsImV4cCI6MTY5MDg2ODM1MiwiaWF0IjoxNjkwMjYzNTUyLCJyZXNvdXJjZSI6Ii9zdG9yYWdlLzExMmk0MWExY2EwMDkzZjA1MmFlNTQ3OWY2MDc1Zjk3NjFiOCJ9.gjgHPZDPb8F0Tp7cFvNj3xHvOz_HzB1nCWr3s8NOlIQ][]

## 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

![122ad6ff343f4d0695218aba61772781.png][]

## 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、 ##

![b3f13385fbfe404eaaf06c2515f6b940.png][]

## 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][Eureka_H_-CSDN]

## docker部署 ##

### 一、打包两个镜像 ###

![2050a401f29f4a24b5aa8b28c696af0a.png][]

![48cc3018eb944cb98a31d89e7dec6923.png][]

### 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

[https_github.com_alibaba_spring-cloud-alibaba_wiki_E7_89_88_E6_9C_AC_E8_AF_B4_E6_98_8E]: https://github.com/alibaba/spring-cloud-alibaba/wiki/%E7%89%88%E6%9C%AC%E8%AF%B4%E6%98%8E
[a0ada196467c4bcc9ddf3ca54dd5eab1.png]: https://img-blog.csdnimg.cn/a0ada196467c4bcc9ddf3ca54dd5eab1.png
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[b1b4e6ee06e7494c8aa881f15cd3e520.png]: https://img-blog.csdnimg.cn/b1b4e6ee06e7494c8aa881f15cd3e520.png
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[122ad6ff343f4d0695218aba61772781.png]: https://img-blog.csdnimg.cn/122ad6ff343f4d0695218aba61772781.png
[b3f13385fbfe404eaaf06c2515f6b940.png]: https://img-blog.csdnimg.cn/b3f13385fbfe404eaaf06c2515f6b940.png
[Eureka_H_-CSDN]: https://blog.csdn.net/qq_25112523/article/details/83028529
[2050a401f29f4a24b5aa8b28c696af0a.png]: https://img-blog.csdnimg.cn/2050a401f29f4a24b5aa8b28c696af0a.png
[48cc3018eb944cb98a31d89e7dec6923.png]: https://img-blog.csdnimg.cn/48cc3018eb944cb98a31d89e7dec6923.png