错误：执行查询时出错：失败：尝试在主机“ mongo.acme.com:27017”上运行命令“查找”时出现网络错误

问题描述

我使用bitnami舵图在kubernetes上安装了mongodb集群。 https://github.com/bitnami/charts/tree/master/bitnami/mongodb。您可以在https://pastebin.com/41rc3JC1

看到我编辑过的生产yaml文件

我已经运行了2-3周。我已经注意到，当我使用cli进行查询时，偶尔会出现以下错误：

rs0:PRIMARY> db.streamers.find().pretty() 

错误：执行查询时出错： 失败：尝试在主机上运行命令“查找”时出现网络错误 'mongo.acme.com:27017'

我使用以下网址mongo mongodb://<redacted_username>:<redacted_password>@mongo.acme.com:27017连接到mongo

rs.status

{
    "set" : "rs0","date" : ISODate("2020-09-16T11:09:40.136Z"),"myState" : 1,"term" : NumberLong(3),"syncingTo" : "","syncSourceHost" : "","syncSourceId" : -1,"heartbeatIntervalMillis" : NumberLong(2000),"majorityVoteCount" : 2,"writeMajorityCount" : 1,"optimes" : {
        "lastCommittedOpTime" : {
            "ts" : Timestamp(1600254574,1),"t" : NumberLong(3)
        },"lastCommittedWallTime" : ISODate("2020-09-16T11:09:34.606Z"),"readConcernMajorityOpTime" : {
            "ts" : Timestamp(1600254574,"readConcernMajorityWallTime" : ISODate("2020-09-16T11:09:34.606Z"),"appliedOpTime" : {
            "ts" : Timestamp(1600254574,"durableOpTime" : {
            "ts" : Timestamp(1600254574,"lastAppliedWallTime" : ISODate("2020-09-16T11:09:34.606Z"),"lastDurableWallTime" : ISODate("2020-09-16T11:09:34.606Z")
    },"lastStableRecoveryTimestamp" : Timestamp(1600254574,"lastStableCheckpointTimestamp" : Timestamp(1600254574,"electionCandidateMetrics" : {
        "lastElectionReason" : "electionTimeout","lastElectionDate" : ISODate("2020-09-16T10:27:44.421Z"),"electionTerm" : NumberLong(3),"lastCommittedOpTimeAtElection" : {
            "ts" : Timestamp(1600241404,"t" : NumberLong(2)
        },"lastSeenOpTimeAtElection" : {
            "ts" : Timestamp(1600241404,"numVotesNeeded" : 2,"priorityAtElection" : 5,"electionTimeoutMillis" : NumberLong(10000),"numCatchUpOps" : NumberLong(0),"newTermStartDate" : ISODate("2020-09-16T10:27:44.439Z"),"wMajorityWriteAvailabilityDate" : ISODate("2020-09-16T10:27:44.502Z")
    },"members" : [
        {
            "_id" : 0,"name" : "a211af6c97d4847519c8a859471a1846-<redacted>.us-east-2.elb.amazonaws.com:27017","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 3975838,"optime" : {
                "ts" : Timestamp(1600254574,"t" : NumberLong(3)
            },"optimeDate" : ISODate("2020-09-16T11:09:34Z"),"infoMessage" : "","electionTime" : Timestamp(1600252064,"electionDate" : ISODate("2020-09-16T10:27:44Z"),"configVersion" : 2,"self" : true,"lastHeartbeatMessage" : ""
        },{
            "_id" : 1,"name" : "mongo-prod-mongodb-arbiter-0.mongo-prod-mongodb-arbiter-headless.mongodb.svc.cluster.local:27017","state" : 7,"stateStr" : "ARBITER","uptime" : 2507,"lastHeartbeat" : ISODate("2020-09-16T11:09:39.159Z"),"lastHeartbeatRecv" : ISODate("2020-09-16T11:09:38.700Z"),"pingMs" : NumberLong(0),"lastHeartbeatMessage" : "","configVersion" : 2
        }
    ],"ok" : 1,"$clusterTime" : {
        "clusterTime" : Timestamp(1600254574,"signature" : {
            "hash" : BinData(0,"7pmSYWIweERYYg/QjqIIjQrQmo4="),"keyId" : NumberLong("6855964983600087044")
        }
    },"operationTime" : Timestamp(1600254574,1)
}

从yaml中可以看到，此mongodb集群通过在AWS上创建的负载均衡器暴露在外部。然后，我设置了一个cname，它将mongo.acme.com指向负载均衡器的URL。

为什么我偶尔会遇到这些网络错误？是我应该关注的事情吗？您能看到我配置错误的任何内容吗？

如果您需要我提供更多信息，请询问。

解决方法

将其发布为Community Wiki以获得更好的可见性，并且未确认为possible root cause。

错误，例如：

failed: network error while attempting to run command 'XXX' on host 'mongo.acme.com:27017'通常发生在mongo server和mongo client shell之间版本不匹配的问题中。

在互联网上可以找到许多示例，例如whatismyuri command或saslStart。

第二个最常见的根本原因是尝试在没有SSL的情况下连接到需要它的MongoDB server，如this troubleshoot guide中所述。

解决此问题的方法是为server和mongo shell使用相同的版本，并检查MongoDB是否需要SSL connection。

但是，如果问题更复杂，则必须仔细检查日志。