Zookeeper注册中心

搭建zookeeper

使用docker运行zookeeper：

$ docker pull zookeeper
$ docker images zookeeper
REPOSITORY   TAG       IMAGE ID       CREATED      SIZE
zookeeper    latest    3f1e19bd8ecc   8 days ago   278MB
$ docker run --name zookeeper --restart always -e JVMFLAGS="-Xmx256m" -p 2181:2181 -d zookeeper

进入容器内，使用zookeeper client：

$ docker exec -it zookeeper /bin/bash
$ cd /apache-zookeeper-3.7.0-bin/bin/
$ ./zkCli.sh
...
[zk: localhost:2181(CONNECTED) 1] ls /
[zookeeper]

使用zookeeper作为注册中心

在pom.xml中添加依赖：

<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>

在启动类中增加注解@EnableDiscoveryClient：

@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain8004 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8004.class, args);
    }
}

在application.yml中增加zookeeper配置：

spring:
  application:
    name: cloud-payment-service
  cloud:
    zookeeper:
      connect-string: 127.0.0.1:2181

启动Spring Boot服务后，在zookeeper client中查服务是否注册成功：

[zk: localhost:2181(CONNECTED) 2] ls /
[services, zookeeper]
[zk: localhost:2181(CONNECTED) 3] ls /services 
[cloud-payment-service]