设置elasticsearch客户端的Kubernetes Readiness

Question

我将kubernetes中的elasticsearch图表从6.6版本升级到7.10.2版本。数据和主pod正在运行并准备好，但是客户端还没有准备好(2个客户端，2个数据，3个主)。

这是他们的状态:

NAME                                    READY   STATUS    RESTARTS   AGE
elasticsearch-client-685c875bb5-5mcxg   0/1     Running   0          2m23s
elasticsearch-client-685c875bb5-cs9lq   0/1     Running     0          24m

当我运行description时，我看到这个警告:

Warning  Unhealthy  10s (x10 over 100s)  kubelet,  Readiness probe failed: Get http://_cluster/health: net/http: request canceled (Client. Timeout exceeded while awaiting headers)

，在kubectl日志中，我得到这个

{"type": "server", "timestamp": "2021-01-24T13:43:41,318Z", "level": "WARN", "component": "r.suppressed", "cluster.name": "elasticsearch", "node.name": "elasticsearch-client-685c875bb5-5mcxg", "message": "path: /_cluster/health, params: {}",
"stacktrace": ["org.elasticsearch.discovery.MasterNotDiscoveredException: null",
"at org.elasticsearch.action.support.master.TransportMasterNodeAction$AsyncSingleAction$2.onTimeout(TransportMasterNodeAction.java:230) [elasticsearch-7.10.2.jar:7.10.2]",
"at org.elasticsearch.cluster.ClusterStateObserver$ContextPreservingListener.onTimeout(ClusterStateObserver.java:335) [elasticsearch-7.10.2.jar:7.10.2]",
"at org.elasticsearch.cluster.ClusterStateObserver$ObserverClusterStateListener.onTimeout(ClusterStateObserver.java:252) [elasticsearch-7.10.2.jar:7.10.2]",
"at org.elasticsearch.cluster.service.ClusterApplierService$NotifyTimeout.run(ClusterApplierService.java:601) [elasticsearch-7.10.2.jar:7.10.2]",
"at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:684) [elasticsearch-7.10.2.jar:7.10.2]",
"at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) [?:?]",
"at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) [?:?]",
"at java.lang.Thread.run(Thread.java:832) [?:?]"] }
{"type": "server", "timestamp": "2021-01-24T13:43:51,319Z", "level": "WARN", "component": "r.suppressed", "cluster.name": "elasticsearch", "node.name": "elasticsearch-client-685c875bb5-5mcxg", "message": "path: /_cluster/health, params: {}",
"stacktrace": ["org.elasticsearch.discovery.MasterNotDiscoveredException: null",
"at org.elasticsearch.action.support.master.TransportMasterNodeAction$AsyncSingleAction$2.onTimeout(TransportMasterNodeAction.java:230) [elasticsearch-7.10.2.jar:7.10.2]",
"at org.elasticsearch.cluster.ClusterStateObserver$ContextPreservingListener.onTimeout(ClusterStateObserver.java:335) [elasticsearch-7.10.2.jar:7.10.2]",
"at org.elasticsearch.cluster.ClusterStateObserver$ObserverClusterStateListener.onTimeout(ClusterStateObserver.java:252) [elasticsearch-7.10.2.jar:7.10.2]",
"at org.elasticsearch.cluster.service.ClusterApplierService$NotifyTimeout.run(ClusterApplierService.java:601) [elasticsearch-7.10.2.jar:7.10.2]",
"at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:684) [elasticsearch-7.10.2.jar:7.10.2]",
"at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) [?:?]",
"at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) [?:?]",
"at java.lang.Thread.run(Thread.java:832) [?:?]"] }

我将readiness和活跃性initialDelaySeconds设置为90这里的问题是什么?

Answer 1

因为你已经从6升级。X到7。请确保您已在env或elasticsearch.yml配置文件中设置了cluster.initial_master_nodes。

Answer 2

你必须有奇数个主节点，例如1,3,5等等，通常3个主节点是最优的。否则，由于缺少仲裁，群集将无法工作。