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rs.status()命令用于获取MongoDB副本集的状态信息。它提供了关于副本集中各个节点的详细信息，包括节点的健康状况、角色、选举状态等。
以下是查看一个mongo集群状态返回的参数：
rs0:PRIMARY> rs.status() { "set" : "rs0", "date" : ISODate("2024-09-14T06:44:36.882Z"), "myState" : 1, "term" : NumberLong(510), "syncingTo" : "", "syncSourceHost" : "", "syncSourceId" : -1, "heartbeatIntervalMillis" : NumberLong(2000), "majorityVoteCount" : 2, "writeMajorityCount" : 2, "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "lastCommittedWallTime" : ISODate("1970-01-01T00:00:00Z"), "appliedOpTime" : { "ts" : Timestamp(1726296270, 1), "t" : NumberLong(510) }, "durableOpTime" : { "ts" : Timestamp(1726296270, 1), "t" : NumberLong(510) }, "lastAppliedWallTime" : ISODate("2024-09-14T06:44:30.859Z"), "lastDurableWallTime" : ISODate("2024-09-14T06:44:30.859Z") }, "lastStableRecoveryTimestamp" : Timestamp(1725300368, 3), "lastStableCheckpointTimestamp" : Timestamp(1725300368, 3), "electionCandidateMetrics" : { "lastElectionReason" : "electionTimeout", "lastElectionDate" : ISODate("2024-09-14T06:28:20.630Z"), "electionTerm" : NumberLong(510), "lastCommittedOpTimeAtElection" : { "ts" : Timestamp(0, 0), "t" : NumberLong(-1) }, "lastSeenOpTimeAtElection" : { "ts" : Timestamp(1726284227, 1), "t" : NumberLong(509) }, "numVotesNeeded" : 2, "priorityAtElection" : 2, "electionTimeoutMillis" : NumberLong(10000), "numCatchUpOps" : NumberLong(0), "newTermStartDate" : ISODate("2024-09-14T06:28:20.830Z") }, "members" : [ { "_id" : 0, "name" : "mongo1:27017", "health" : 1, "state" : 9, "stateStr" : "ROLLBACK", "uptime" : 987, "optime" : { "ts" : Timestamp(1726197065, 1), "t" : NumberLong(505) }, "optimeDurable" : { "ts" : Timestamp(1726197065, 1), "t" : NumberLong(505) }, "optimeDate" : ISODate("2024-09-13T03:11:05Z"), "optimeDurableDate" : ISODate("2024-09-13T03:11:05Z"), "lastHeartbeat" : ISODate("2024-09-14T06:44:35.841Z"), "lastHeartbeatRecv" : ISODate("2024-09-14T06:44:36.665Z"), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "", "syncingTo" : "mongo2:27017", "syncSourceHost" : "mongo2:27017", "syncSourceId" : 1, "infoMessage" : "", "configVersion" : 1950478 }, { "_id" : 1, "name" : "mongo2:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 990, "optime" : { "ts" : Timestamp(1726296270, 1), "t" : NumberLong(510) }, "optimeDate" : ISODate("2024-09-14T06:44:30Z"), "syncingTo" : "", "syncSourceHost" : "", "syncSourceId" : -1, "infoMessage" : "", "electionTime" : Timestamp(1726295300, 1), "electionDate" : ISODate("2024-09-14T06:28:20Z"), "configVersion" : 1950478, "self" : true, "lastHeartbeatMessage" : "" }, { "_id" : 2, "name" : "mongo3:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 987, "optime" : { "ts" : Timestamp(1726197065, 1), "t" : NumberLong(505) }, "optimeDurable" : { "ts" : Timestamp(1726197065, 1), "t" : NumberLong(505) }, "optimeDate" : ISODate("2024-09-13T03:11:05Z"), "optimeDurableDate" : ISODate("2024-09-13T03:11:05Z"), "lastHeartbeat" : ISODate("2024-09-14T06:44:34.930Z"), "lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"), "pingMs" : NumberLong(1), "lastHeartbeatMessage" : "", "syncingTo" : "", "syncSourceHost" : "", "syncSourceId" : -1, "infoMessage" : "", "configVersion" : 1829326 } ], "ok" : 1, "$clusterTime" : { "clusterTime" : Timestamp(1726296270, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } }, "operationTime" : Timestamp(1726296270, 1) } rs0:PRIMARY>
以下是rs.status()响应字段的意义及其对应值的整理：
| 字段 | 意义 | 示例值 |
|---|---|---|
set |
副本集的名称 | "rs0" |
date |
响应生成的时间 | ISODate("2024-09-14T06:44:36Z") |
myState |
当前节点的状态（1: PRIMARY, 2: SECONDARY, 3: RECOVERING等）：
常见的状态包括：
|
1 |
term |
当前选举周期 | 510 |
lastElectionReason |
最近一次选举的原因 | "electionTimeout" |
members |
副本集成员的详细信息 | 数组，包含各个节点的信息 |
health |
节点的健康状态（1: 健康, 0: 不健康） | 1 |
stateStr |
节点的状态描述（如 PRIMARY, SECONDARY, ROLLBACK等） | "SECONDARY" |
uptime |
节点的运行时间（秒） | 987 |
optime |
最近一次操作的时间戳 | Timestamp(1726197065, 1) |
optimeDurable |
最近一次持久化操作的时间戳 | Timestamp(1726197065, 1) |
optimeDate |
最近一次操作的日期 | ISODate("2024-09-13T03:11:05Z") |
optimeDurableDate |
最近一次持久化操作的日期 | ISODate("2024-09-13T03:11:05Z") |
lastHeartbeat |
最近一次心跳信号的时间 | ISODate("2024-09-14T06:44:34.930Z") |
lastHeartbeatRecv |
最近一次接收到心跳信号的时间 | ISODate("1970-01-01T00:00:00Z") |
pingMs |
节点的延迟（毫秒） | NumberLong(1) |
lastHeartbeatMessage |
最近一次心跳的消息 | "" |
syncingTo |
当前节点正在同步的目标节点 | "" |
syncSourceHost |
当前节点的同步源主机 | "" |
syncSourceId |
当前节点的同步源ID | -1 |
infoMessage |
额外的信息消息 | "" |
configVersion |
配置版本号 | 1829326 |
$clusterTime |
集群时间信息 | 包含 clusterTime 和 signature |
operationTime |
最近一次操作的时间 | Timestamp(1726296270, 1) |
使用场景
- 故障排查: 当副本集出现问题时，使用
rs.status()可以快速定位故障节点。 - 性能监控: 定期检查副本集状态，以确保所有节点正常运行并及时发现性能瓶颈。
- 维护操作: 在进行维护或升级操作前，确认副本集的健康状况。
- 选举监控: 监控选举过程，确保主节点的选举和切换正常进行。
