| 到此,MongoDB副本集部署完成,我们可以通过rs.status()命令查看副本集状态。 gitlib@devops:~$ mongo 127.0.0.1:27018 rs0:SECONDARY> rs.status() {     "set" : "rs0",     "date" : ISODate("2019-09-26T12:09:48.818Z"),     "myState" : 2,     "term" : NumberLong(1),     "syncingTo" : "127.0.0.1:27017",     "syncSourceHost" : "127.0.0.1:27017",     "syncSourceId" : 0,     "heartbeatIntervalMillis" : NumberLong(2000),     "optimes" : {         "lastCommittedOpTime" : {             "ts" : Timestamp(1569499786, 1),             "t" : NumberLong(1)         },         "lastCommittedWallTime" : ISODate("2019-09-26T12:09:46.038Z"),         "readConcernMajorityOpTime" : {             "ts" : Timestamp(1569499786, 1),             "t" : NumberLong(1)         },         "readConcernMajorityWallTime" : ISODate("2019-09-26T12:09:46.038Z"),         "appliedOpTime" : {             "ts" : Timestamp(1569499786, 1),             "t" : NumberLong(1)         },         "durableOpTime" : {             "ts" : Timestamp(1569499786, 1),             "t" : NumberLong(1)         },         "lastAppliedWallTime" : ISODate("2019-09-26T12:09:46.038Z"),         "lastDurableWallTime" : ISODate("2019-09-26T12:09:46.038Z")     },     "lastStableRecoveryTimestamp" : Timestamp(1569499726, 1),     "lastStableCheckpointTimestamp" : Timestamp(1569499726, 1),     "members" : [         {             "_id" : 0,             "name" : "127.0.0.1:27017",             "ip" : "127.0.0.1",             "health" : 1,             "state" : 1,             "stateStr" : "PRIMARY",             "uptime" : 42574,             "optime" : {                 "ts" : Timestamp(1569499786, 1),                 "t" : NumberLong(1)             },             "optimeDurable" : {                 "ts" : Timestamp(1569499786, 1),                 "t" : NumberLong(1)             },             "optimeDate" : ISODate("2019-09-26T12:09:46Z"),             "optimeDurableDate" : ISODate("2019-09-26T12:09:46Z"),             "lastHeartbeat" : ISODate("2019-09-26T12:09:47.119Z"),             "lastHeartbeatRecv" : ISODate("2019-09-26T12:09:47.667Z"),             "pingMs" : NumberLong(0),             "lastHeartbeatMessage" : "",             "syncingTo" : "",             "syncSourceHost" : "",             "syncSourceId" : -1,             "infoMessage" : "",             "electionTime" : Timestamp(1569457173, 2),             "electionDate" : ISODate("2019-09-26T00:19:33Z"),             "configVersion" : 3         },         {             "_id" : 1,             "name" : "127.0.0.1:27018",             "ip" : "127.0.0.1",             "health" : 1,             "state" : 2,             "stateStr" : "SECONDARY",             "uptime" : 43284,             "optime" : {                 "ts" : Timestamp(1569499786, 1),                 "t" : NumberLong(1)             },             "optimeDate" : ISODate("2019-09-26T12:09:46Z"),             "syncingTo" : "127.0.0.1:27017",             "syncSourceHost" : "127.0.0.1:27017",             "syncSourceId" : 0,             "infoMessage" : "",             "configVersion" : 3,             "self" : true,             "lastHeartbeatMessage" : ""         },         {             "_id" : 2,             "name" : "127.0.0.1:27019",             "ip" : "127.0.0.1",             "health" : 1,             "state" : 2,             "stateStr" : "SECONDARY",             "uptime" : 42569,             "optime" : {                 "ts" : Timestamp(1569499786, 1),                 "t" : NumberLong(1)             },             "optimeDurable" : {                 "ts" : Timestamp(1569499786, 1),                 "t" : NumberLong(1)             },             "optimeDate" : ISODate("2019-09-26T12:09:46Z"),             "optimeDurableDate" : ISODate("2019-09-26T12:09:46Z"),             "lastHeartbeat" : ISODate("2019-09-26T12:09:47.646Z"),             "lastHeartbeatRecv" : ISODate("2019-09-26T12:09:47.036Z"),             "pingMs" : NumberLong(0),             "lastHeartbeatMessage" : "",             "syncingTo" : "127.0.0.1:27018",             "syncSourceHost" : "127.0.0.1:27018",             "syncSourceId" : 1,             "infoMessage" : "",             "configVersion" : 3         }     ],     "ok" : 1,     "$clusterTime" : {         "clusterTime" : Timestamp(1569499786, 1),         "signature" : {             "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),             "keyId" : NumberLong(0)         }     },     "operationTime" : Timestamp(1569499786, 1) } 
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