springCloud微服务系列——配置中心第四篇——手动刷新
一、简介配置文件如果改变了,已经启动的服务如何获得最新的配置,当然可以重新启动服务,但是这样速度太慢了,还需要到服务器上去操作,增加了运维成本,spring cloud提供了一个手动刷新的解决方案。
二、客户端刷新
客户端刷新是调用单个客户端的端点刷新接口,这样只刷新被调用刷新接口的端点。
端点配置
spring cloud在actuator中提供了一个refresh端点,通过该端点可以进行刷新。
客户端引入actuator
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>客户端引入spring security
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>配置management并暴露端点
management:
server:
port: 8101
servlet:
context-path: /demo/configClient/admin
endpoints:
web:
exposure:
include: "*"
在需要刷新的类上加上@RefreshScope注解
@RefreshScope
@RestController
@RequestMapping("testApi")
public class ConfigTestApi {
@Value("${luminary.test}")
private String test;
@GetMapping("/config")
public String server(
HttpServletRequest request,
HttpServletResponse response) {
return test;
}
}
安全配置对refresh端点不进行csrf防护@Configuration
@EnableWebSecurity
public class EurekaClientWebSecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http
.authorizeRequests()
// 普通的接口不需要校验
.antMatchers("/*api/**").permitAll()
// swagger页面需要添加登录校验
.antMatchers("/swagger-ui.html").authenticated()
// 监控节点需要添加登录校验
.requestMatchers(EndpointRequest.toAnyEndpoint()).authenticated()
.and()
// 允许刷新服务
.csrf().ignoringAntMatchers("/actuator/refresh");
super.configure(http);
}
}
刷新通过POST调用客户端的refresh端点,如果配置有改变,返回结果如下需要注意的是refresh端点是actuator的端点,所以如果配置了management的话,要用management中配置的server.port和server.servlet.context-path
三、服务端刷新客户端刷新需要每个客户端调用refresh接口,我们希望能在服务端调用刷新接口,然后通知每个客户端进行刷新。我们需要借助消息总线spring-cloud-bus将刷新信息发送到客户端,目前spring-cloud-bus支持rabbitMq和kafka,这里以kafka做例子。端点配置服务端引入actuator,spring security,spring cloud bus,spring cloud config monitor<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bus-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-monitor</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
服务端配置management并暴露端点management:
server:
port: 8168
servlet:
context-path: /manage/serverConfig/admin
endpoints:
web:
exposure:
include: "*"
客户端在需要刷新的类上加上@RefreshScope注解@RefreshScope
@RestController
@RequestMapping("testApi")
public class ConfigTestApi {
@Value("${luminary.test}")
private String test;
@GetMapping("/config")
public String server(
HttpServletRequest request,
HttpServletResponse response) {
return test;
}
}
安全配置对bus-refresh端点不进行csrf防护@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http
.authorizeRequests()
.requestMatchers(EndpointRequest.toAnyEndpoint()).authenticated()
.and()
.csrf().ignoringAntMatchers("/encrypt", "/decrypt", "/actuator/bus-refresh");
super.configure(http);
}
}
KAFKA配置spring cloud bus通过消息队列发送配置变更消息给客户端,目前只支持rabbitMq和kafka,这里选择使用kafka服务端和客户端配置spring:
cloud:
stream:
kafka:
binder:
brokers: localhost:9092
#zk-nodes: localhost:2181 #spring cloud Finchley已弃用,zookeeper会被自动配置
auto-add-partitions: true
auto-create-topics: true
min-partition-count: 1
刷新通过POST调用服务端的bus-refresh端点需要注意的是bus-refresh端点是actuator的端点,所以如果配置了management的话,要用management中配置的server.port和server.servlet.context-path
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