SpringBoot監控Actuator，關閉redis監測

方法

當我們導入了spring-boot-starter-actuator這個依賴後, SpringBoot會默認去監測一些信息。其中就包括redis、 會根據redis的默認初始配置， localhost:6379 嘗試連接redis。如果我們沒有用到redis， 啓動就會報錯

 <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-actuator</artifactId>
      <version>2.2.1.RELEASE</version>
   </dependency>

比如我在使用SpringBootAdmin的時候，其中內置了Actuator的依賴， 啓動報錯

[WARN ] 2020-05-28 09:28:17.179 [registrationTask1] de.codecentric.boot.admin.client.registration.ApplicationRegistrator - Failed to register application as Application(name=admin-client, managementUrl=http://Gordon-pc:8768/actuator, healthUrl=http://Gordon-pc:8768/actuator/health, serviceUrl=http://Gordon-pc:8768/) at spring-boot-admin ([http://localhost:8769/instances]): I/O error on POST request for "http://localhost:8769/instances": Connection refused: connect; nested exception is java.net.ConnectException: Connection refused: connect. Further attempts are logged on DEBUG level
[WARN ] 2020-05-28 09:28:19.075 [boundedElastic-1] org.springframework.boot.actuate.redis.RedisReactiveHealthIndicator - Redis health check failed
org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to localhost:6379
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getNativeConnection(LettuceConnectionFactory.java:1200)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getConnection(LettuceConnectionFactory.java:1179)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getSharedReactiveConnection(LettuceConnectionFactory.java:952)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getReactiveConnection(LettuceConnectionFactory.java:429)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getReactiveConnection(LettuceConnectionFactory.java:94)
	at reactor.core.publisher.MonoSupplier.call(MonoSupplier.java:85)
	at reactor.core.publisher.FluxSubscribeOnCallable$CallableSubscribeOnSubscription.run(FluxSubscribeOnCallable.java:225)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68)
	at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28)
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
	at java.util.concurrent.FutureTask.run(FutureTask.java)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to localhost:6379
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:78)
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:56)
	at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:234)
	at io.lettuce.core.RedisClient.connect(RedisClient.java:207)
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.lambda$getConnection$1(StandaloneConnectionProvider.java:115)
	at java.util.Optional.orElseGet(Optional.java:267)
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.getConnection(StandaloneConnectionProvider.java:115)
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getNativeConnection(LettuceConnectionFactory.java:1198)
	... 15 common frames omitted

在網上搜了下解決方法， 發現都是提供的這一種方式：

@Component("redisHealthIndicator")
public class RedisHealthIndicator implements HealthIndicator {

    @Override
    public Health health() {
        return Health.up().build();
    }
    
}

結果我在看配置文件的時候, 發現另一個簡單的方式: application.yml中加上

management:
  health:
    redis:
      enabled: false

就可以了