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springcloud筆記三注冊中心eureka、zookeeper、consul一、eureka二、zookeeper三、consul

一、eureka

1.服務端

pom檔案

添加eureka-server

<!--eureka-server-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

yaml檔案 

# eureka叢集互相注冊
server:
  port: 7002
#eureka:
#  instance:
#    hostname: eureka7002.com
#  client:
#    register-with-eureka: false
#    fetch-registry: false
#    com.fox.springcloud.service-url:
#      defaultzone: http://eureka7001.com:7001/eureka/
eureka:
  instance:
    hostname: eureka7002.com
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/
  server:
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 20000

啟動類

添加@EnableEurekaServer注解

2.用戶端(服務注冊+restTemplate)

pom檔案

添加eureka-client maven坐标

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

yaml檔案 

eureka:
  client:
    register-with-eureka: true
    service-url:
#      defaultZone: http://localhost:7001/eureka
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
    fetch-registry: true
  instance:
    instance-id: payment8001
    prefer-ip-address: true
    lease-renewal-interval-in-seconds: 10
    lease-expiration-duration-in-seconds: 30

啟動類

添加@EnableEurekaClient、@EnableDiscoveryClient注解

備注：@EnableEurekaClient隻适用于使用Eureka作為注冊中心的場景，@EnableDiscoveryClient可以适用于其他注冊中心的場景比如nacos等。

調用遠端服務

使用服務名代替服務提供者的ip端口調用

擷取注冊中心的服務 

@Resource
private DiscoveryClient discoveryClient;

可以通過discoveryClient擷取注冊中心的服務和對應的instances

3.用戶端(openfeign)

pom檔案

添加eureka-client和openfeign

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

yaml檔案 

eureka:
  client:
    register-with-eureka: false
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/
feign:
  client:
    config:
      default:
        ReadTimeout: 5000
        ConnectTimeout: 5000

啟動類

添加@EnableFeignClients注解

調用遠端服務

PaymentFeignService中的服務名和接口路徑要和服務提供者一緻，項目中注入PaymentFeignService即可調用

@Component
@FeignClient("PAYMENT-SERVICE")
public interface PaymentFeignService {
    @GetMapping("/payment/lb")
    public String getPaymentLB();

    @GetMapping("/payment/timeout")
    public String getTimeout();
}

二、zookeeper

1.zookeeper服務端安裝

下載下傳zookeeper

wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.5.9/apache-zookeeper-3.5.9-bin.tar.gz

zookeeper安裝後要注意檢查防火牆是否關閉

檢視防火牆狀态
systemctl status firewalld.service
關閉防火牆
systemctl stop firewalld.service

java項目連接配接zookeeper時要注意和伺服器版本一緻。

進入bin目錄下，啟動zookeeper

./zkServer.sh start
連接配接zookeeper
./zkCli.sh

2.用戶端(服務注冊調用)

pom檔案 

<!--SpringBoot整合Zookeeper用戶端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <exclusions>
                <!--先排除自帶的zookeeper3.5.3-->
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--添加zookeeper3.5.9版本-->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.5.9</version>
        </dependency>

yaml檔案 

spring:
  application:
    # 服務别名---注冊zookeeper到注冊中心的名稱
    name: cloud-provider-payment
  cloud:
    zookeeper:
      # 預設localhost:2181
      connect-string: 192.168.137.200:2181

啟動類

添加@EnableDiscoveryClient注解

調用遠端服務

通過服務名代替ip端口

zookeeper節點類型 

1、PERSISTENT--持久化目錄節點
用戶端與zookeeper斷開連接配接後，該節點依舊存在
2、PERSISTENT_SEQUENTIAL-持久化順序編号目錄節點
用戶端與zookeeper斷開連接配接後，該節點依舊存在，隻是Zookeeper給該節點名稱進行順序編号
3、EPHEMERAL-臨時目錄節點
用戶端與zookeeper斷開連接配接後，該節點被删除
4、EPHEMERAL_SEQUENTIAL-臨時順序編号目錄節點
用戶端與zookeeper斷開連接配接後，該節點被删除，隻是Zookeeper給該節點名稱進行順序編号
springcloud筆記三注冊中心eureka、zookeeper、consul一、eureka二、zookeeper三、consul

三、consul

1.consul服務端安裝

consul下載下傳安裝官網寫的非常詳細https://www.consul.io/downloads

sudo yum install -y yum-utils
sudo yum-config-manager --add-repo https://rpm.releases.hashicorp.com/RHEL/hashicorp.repo
sudo yum -y install consul

檢視是否安裝成功

consul -version
springcloud筆記三注冊中心eureka、zookeeper、consul一、eureka二、zookeeper三、consul

啟動consul

window啟動
consul agent dev
centos啟動(0.0.0.0允許遠端通路)
consul agent -dev -client 0.0.0.0 -ui &
檢視程序是否啟動成功
netstat -anp|grep 8500
檢視Consul叢集的成員
consul members
springcloud筆記三注冊中心eureka、zookeeper、consul一、eureka二、zookeeper三、consul

2.用戶端(服務注冊調用)

pom檔案

添加consul-discovery

<!--SpringCloud consul-server-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>

yaml檔案 

spring:
  application:
    # 服務别名---注冊consul到注冊中心的名稱
    name: cloud-provider-payment
  cloud:
    consul:
      host: 192.168.137.200
      port: 8500
      discovery:
        service-name: ${spring.application.name}

啟動類

添加@EnableDiscoveryClient注解

調用遠端服務

通過服務名代替ip端口

3.使用過程中遇到的問題

問題一、注冊服務提供者連接配接不上consul

使用telnet ip端口報錯

telnet: connect to address 192.168.137.200: No route to host

檢視防火牆狀态

firewall-cmd --state

發現防火牆是running狀态，關閉防火牆，再telnet成功

service firewalld stop

問題二、consul中服務健康狀态為unhealth

頁面顯示叉

springcloud筆記三注冊中心eureka、zookeeper、consul一、eureka二、zookeeper三、consul

點進去

springcloud筆記三注冊中心eureka、zookeeper、consul一、eureka二、zookeeper三、consul

通過output資訊判斷可能是使用了服務運作時的主機名，檢視主機名确實是DESKTOP-JOKG37G

127.0.0.1 DESKTOP-JOKG37G

原因是springcloud服務注冊到consul的是主機名，consul所在的伺服器不能識别該主機名導緻

解決方法：

一、在consul伺服器/etc/hosts檔案中配置主機名映射到Springcloud服務ip

二、指定注冊到consul的ip位址spring.cloud.consul.discovery.hostname

spring:
  application:
    name: cloud-consumer-order
  cloud:
    consul:
      host: 192.168.137.200
      port: 8500
      discovery:
        hostname: 192.168.137.166
        service-name: ${spring.application.name}
SpringCloud學習 zookeeper eureka java
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