MongoDB中怎么切换副本集

MongoDB中怎么切换副本集，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。MongoDB 副本集切换方法1、rs.stepDown([stepdownSecs, catchUpSecs]) step down as primary (disconnects) 操作步骤如下： [root@127-0-0-1 conf]# mongo –port 2777 shard1:PRIMARY> show dbs admin 0.000GB config 0.000GB local 0.001GB yoon 0.000GB shard1:PRIMARY> rs.help()rs.status() { replSetGetStatus : 1 } checks repl set statusrs.initiate() { replSetInitiate : null } initiates set with default settingsrs.initiate(cfg) { replSetInitiate : cfg } initiates set with configuration cfgrs.conf() get the current configuration object from local.system.replsetrs.reconfig(cfg) updates the configuration of a running replica set with cfg (disconnects)rs.add(hostportstr) add a new member to the set with default attributes (disconnects)rs.add(membercfgobj) add a new member to the set with extra attributes (disconnects)rs.addArb(hostportstr) add a new member which is arbiterOnly:true (disconnects)rs.stepDown([stepdownSecs, catchUpSecs]) step down as primary (disconnects)rs.syncFrom(hostportstr) make a secondary sync from the given memberrs.freeze(secs) make a node ineligible to become primary for the time specifiedrs.remove(hostportstr) remove a host from the replica set (disconnects)rs.slaveOk() allow queries on secondary nodesrs.printReplicationInfo() check oplog size and time rangers.printSlaveReplicationInfo() check replica set members and replication lagdb.isMaster() check who is primaryreconfiguration helpers disconnect from the database so the shell will displayan error, even if the command succeeds. shard1:PRIMARY> rs.stepDown() #这个命令会让primary降级为Secondary节点 shard1:PRIMARY> rs.stepDown(30) #这个命令会让primary降级为Secondary节点并维持30S，如果这段时间没有新的primary选举出来，这个节点重新加入进行选举2、通过设置优先级 A.为了保证数据的一致性，必须先关闭应用的写服务 B.提升要升级为primary节点的Secondary节点的优先级 操作如下： 查看当前配置信息： shard1:PRIMARY> rs.conf(){“_id” : “shard1″,”version” : 4,”protocolVersion” : NumberLong(1),”writeConcernMajorityJournalDefault” : true,”members” : [{“_id” : 0,”host” : “127.0.0.1:2777″,”arbiterOnly” : false,”buildIndexes” : true,”hidden” : false,”priority” : 3,”tags” : {},”slaveDelay” : NumberLong(0),”votes” : 1},{“_id” 免费云主机域名: 1,”host” : “127.0.0.1:3777″,”arbiterOnly” : false,”buildIndexes” : true,”hidden” : false,”priority” : 1,”tags” : {},”slaveDelay” : NumberLong(0),”votes” : 1},{“_id” : 2,”host” : “127.0.0.1:4777″,”arbiterOnly” : false,”buildIndexes” : true,”hidden” : false,”priority” : 1,”tags” : {},”slaveDelay” : NumberLong(0),”votes” : 1}],”settings” : {“chainingAllowed” : true,”heartbeatIntervalMillis” : 2000,”heartbeatTimeoutSecs” : 10,”electionTimeoutMillis” : 10000,”catchUpTimeoutMillis” : -1,”catchUpTakeoverDelayMillis” : 30000,”getLastErrorModes” : {},”getLastErrorDefaults” : {“w” : 1,”wtimeout” : 0},”replicaSetId” : ObjectId(“5f27de76c8d22581cdeb2f2e”)}} shard1:PRIMARY> config=rs.conf() # 查看当前配置，存入config变量中 shard1:PRIMARY> config.members[2].priority = 3 # 修改config变量，将第三组端口为4777的成员优先级设置为3 shard1:PRIMARY> rs.reconfig(config) #
配置生效 shard1:PRIMARY> db.isMaster(){“hosts” : [“127.0.0.1:2777″,”127.0.0.1:3777″,”127.0.0.1:4777″],”setName” : “shard1″,”setVersion” : 7,”ismaster” : true,”secondary” : false,”primary” : “127.0.0.1:4777”, “me” : “127.0.0.1:4777″,”electionId” : ObjectId(“7fffffff0000000000000004″),”lastWrite” : {“opTime” : {“ts” : Timestamp(1596599298, 1),”t” : NumberLong(4)},”lastWriteDate” : ISODate(“2020-08-05T03:48:18Z”),”majorityOpTime” : {“ts” : Timestamp(1596599298, 1),”t” : NumberLong(4)},”majorityWriteDate” : ISODate(“2020-08-05T03:48:18Z”)}…..看完上述内容是否对您有帮助呢？如果还想对相关知识有进一步的了解或阅读更多相关文章，请关注百云行业资讯频道，感谢您对百云的支持。

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