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今天skywalking突然不能用了，看日志：
2018-08-09 10:15:29,556 - org.apache.skywalking.apm.collector.cache.caffeine.service.ServiceNameCacheCaffeineService -82494825 [grpc-default-executor-149] ERROR [] - No shard available for [get [service_name][type][-87]: routing [null]]
org.elasticsearch.action.NoShardAvailableActionException: No shard available for [get [service_name][type][-87]: routing [null]]at org.elasticsearch.action.support.single.shard.TransportSingleShardAction$AsyncSingleAction.perform(TransportSingleShardAction.java:209) ~[elasticsearch-5.5.0.jar:5.5.0]at org.elasticsearch.action.support.single.shard.TransportSingleShardAction$AsyncSingleAction.start(TransportSingleShardAction.java:186) ~[elasticsearch-5.5.0.jar:5.5.0]at org.elasticsearch.action.support.single.shard.TransportSingleShardAction.doExecute(TransportSingleShardAction.java:95) ~[elasticsearch-5.5.0.jar:5.5.0]at org.elasticsearch.action.support.single.shard.TransportSingleShardAction.doExecute(TransportSingleShardAction.java:59) ~[elasticsearch-5.5.0.jar:5.5.0]at org.elasticsearch.action.support.TransportAction.doExecute(TransportAction.java:146) ~[elasticsearch-5.5.0.jar:5.5.0]at org.elasticsearch.action.support.TransportAction$RequestFilterChain.proceed(TransportAction.java:170) ~[elasticsearch-5.5.0.jar:5.5.0]at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:142) ~[elasticsearch-5.5.0.jar:5.5.0]at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:84) ~[elasticsearch-5.5.0.jar:5.5.0]
然后看elasticsearch集群状态
发现elasticsearch集群的健康值是red。
集群状态red的原因有很多，比如磁盘不够了分片无法分配，集群里面承担分片的节点坏了导致无法分配等等
我的是后一种,我的docker容器挂了一个，重启恢复了
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