(一)查看副本集状态
要查看副本集状态及每个成员的状态，可以连接到主节点，使用 rs.status() 命令查看：
rstest:PRIMARY> rs.status() { "set" : "rstest", "date" : ISODate("2020-06-30T15:06:44.586Z"), "myState" : 1, "term" : NumberLong(15), "syncingTo" : "", "syncSourceHost" : "", "syncSourceId" : -1, "heartbeatIntervalMillis" : NumberLong(2000), "majorityVoteCount" : 2, "writeMajorityCount" : 2, "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "lastCommittedWallTime" : ISODate("2020-06-30T15:06:38.972Z"), "readConcernMajorityOpTime" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "readConcernMajorityWallTime" : ISODate("2020-06-30T15:06:38.972Z"), "appliedOpTime" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "durableOpTime" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "lastAppliedWallTime" : ISODate("2020-06-30T15:06:38.972Z"), "lastDurableWallTime" : ISODate("2020-06-30T15:06:38.972Z") }, "lastStableRecoveryTimestamp" : Timestamp(1593529578, 1), "lastStableCheckpointTimestamp" : Timestamp(1593529578, 1), "electionCandidateMetrics" : { "lastElectionReason" : "priorityTakeover", "lastElectionDate" : ISODate("2020-06-30T11:42:47.656Z"), "electionTerm" : NumberLong(15), "lastCommittedOpTimeAtElection" : { "ts" : Timestamp(1593517366, 1), "t" : NumberLong(14) }, "lastSeenOpTimeAtElection" : { "ts" : Timestamp(1593517366, 1), "t" : NumberLong(14) }, "numVotesNeeded" : 2, "priorityAtElection" : 3, "electionTimeoutMillis" : NumberLong(10000), "priorPrimaryMemberId" : 2, "numCatchUpOps" : NumberLong(0), "newTermStartDate" : ISODate("2020-06-30T11:42:47.731Z"), "wMajorityWriteAvailabilityDate" : ISODate("2020-06-30T11:42:48.789Z") }, "electionParticipantMetrics" : { "votedForCandidate" : true, "electionTerm" : NumberLong(14), "lastVoteDate" : ISODate("2020-06-30T11:42:36.235Z"), "electionCandidateMemberId" : 2, "voteReason" : "", "lastAppliedOpTimeAtElection" : { "ts" : Timestamp(1593364745, 1), "t" : NumberLong(12) }, "maxAppliedOpTimeInSet" : { "ts" : Timestamp(1593364745, 1), "t" : NumberLong(12) }, "priorityAtElection" : 3 }, "members" : [ { "_id" : 0, "name" : "192.168.10.41:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 12262, "optime" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "optimeDate" : ISODate("2020-06-30T15:06:38Z"), "syncingTo" : "", "syncSourceHost" : "", "syncSourceId" : -1, "infoMessage" : "", "electionTime" : Timestamp(1593517367, 1), "electionDate" : ISODate("2020-06-30T11:42:47Z"), "configVersion" : 12, "self" : true, "lastHeartbeatMessage" : "" }, { "_id" : 2, "name" : "192.168.10.43:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 12258, "optime" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "optimeDurable" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "optimeDate" : ISODate("2020-06-30T15:06:38Z"), "optimeDurableDate" : ISODate("2020-06-30T15:06:38Z"), "lastHeartbeat" : ISODate("2020-06-30T15:06:43.724Z"), "lastHeartbeatRecv" : ISODate("2020-06-30T15:06:43.051Z"), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "", "syncingTo" : "192.168.10.41:27017", "syncSourceHost" : "192.168.10.41:27017", "syncSourceId" : 0, "infoMessage" : "", "configVersion" : 12 }, { "_id" : 3, "name" : "192.168.10.42:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 12258, "optime" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "optimeDurable" : { "ts" : Timestamp(1593529598, 1), "t" : NumberLong(15) }, "optimeDate" : ISODate("2020-06-30T15:06:38Z"), "optimeDurableDate" : ISODate("2020-06-30T15:06:38Z"), "lastHeartbeat" : ISODate("2020-06-30T15:06:43.724Z"), "lastHeartbeatRecv" : ISODate("2020-06-30T15:06:43.051Z"), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "", "syncingTo" : "192.168.10.43:27017", "syncSourceHost" : "192.168.10.43:27017", "syncSourceId" : 2, "infoMessage" : "", "configVersion" : 12 } ], "ok" : 1, "$clusterTime" : { "clusterTime" : Timestamp(1593529598, 1), "signature" : { "hash" : BinData(0,"JcYryJc0DU0GgX0mCKS1D86r30Y="), "keyId" : NumberLong("6841443127941660675") } }, "operationTime" : Timestamp(1593529598, 1) }