No instances available for 172.16.205.89

报错原因：
直接调具体ip地址，无法实现负载均衡，导致提示错误 “No instances available for 172.16.205.89”

解决办法：
pom文件中引入相关依赖：

	<!--ribbon相关-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-ribbon</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>

不要直接写

@Autowired
privete RestTemplate restTemplate;

改成这个

@Bean
@LoadBalanced
private RestTemplate getRestTemplate() {
    return new RestTemplate();
}