何小伟-向Mongodb集群添加新的成员节点.doc

向Mongodb集群添加新的成员节点 向集群添加新节点有两种方法：方 法第一种方法拷贝其他节点的数据文件到新的节点第二种方法向已有的replica set 添加新成员一第一种方法(拷贝其他节点的数据文件到新的节点) 我们在启动mongod服务之前一定要拷贝数据文件到本机。下面是空库添加到一个replica set中的日志记录：第一步：# 连接Primary库Tue Nov 1 14:22:57 initandlisten connection accepted from 10.250.7.220:54235 #2Tue Nov 1 14:22:57 initandlisten connection accepted from 10.250.7.220:54236 #3Tue Nov 1 14:22:57 initandlisten connection accepted from 10.250.7.220:54237 #4Tue Nov 1 14:22:57 rsStart trying to contact 10.250.7.220:27018Tue Nov 1 14:22:57 rsStart trying to contact 10.250.7.220:27019Tue Nov 1 14:22:57 rsStart trying to contact 10.250.7.220:27020第二步：#从primary库复制replica set的配置信息，并保存到本地 -dbpath 指定的文件目录#Tue Nov 1 14:22:57 rsStart replSet got config version 2 from a remote, saving locallyTue Nov 1 14:22:57 rsStart replSet info saving a newer config version to local.system.replsetTue Nov 1 14:22:57 FileAllocator allocating new datafile /opt/mongodata/r1/local.ns, filling with zeroes.Tue Nov 1 14:22:57 FileAllocator creating directory /opt/mongodata/r1/_tmpTue Nov 1 14:22:57 FileAllocator done allocating datafile /opt/mongodata/r1/local.ns, size: 16MB, took 0.118 secsTue Nov 1 14:22:57 FileAllocator allocating new datafile /opt/mongodata/r1/local.0, filling with zeroes.Tue Nov 1 14:23:01 FileAllocator done allocating datafile /opt/mongodata/r1/local.0, size: 64MB, took 3.807 secsTue Nov 1 14:23:01 FileAllocator allocating new datafile /opt/mongodata/r1/local.1, filling with zeroes.Tue Nov 1 14:23:02 rsStart replSet saveConfigLocally doneTue Nov 1 14:23:02 FileAllocator done allocating datafile /opt/mongodata/r1/local.1, size: 128MB, took 1.068 secsTue Nov 1 14:23:02 rsStart replSet STARTUP2Tue Nov 1 14:23:02 rsMgr replSet total number of votes is even - add arbiter or give one member an extra voteTue Nov 1 14:23:02 rsSync *第三步：#创建oplog 日志文件#Tue Nov 1 14:23:02 rsSync creating replication oplog of size: 944MB.Tue Nov 1 14:23:02 FileAllocator allocating new datafile /opt/mongodata/r1/local.2, filling with zeroes.Tue Nov 1 14:23:04 rsHealthPoll replSet info member 10.250.7.220:27018 is upTue Nov 1 14:23:04 rsHealthPoll replSet member 10.250.7.220:27018 is now in state SECONDARYTue Nov 1 14:23:04 rsHealthPoll replSet info member 10.250.7.220:27019 is upTue Nov 1 14:23:04 rsHealthPoll replSet member 10.250.7.220:27019 is now in state SECONDARYTue Nov 1 14:23:04 rsHealthPoll replSet info member 10.250.7.220:27020 is upTue Nov 1 14:23:04 rsHealthPoll replSet member 10.250.7.220:27020 is now in state PRIMARYTue Nov 1 14:23:49 FileAllocator done allocating datafile /opt/mongodata/r1/local.2, size: 1024MB, took 46.28 secsTue Nov 1 14:23:50 rsSync *第四步：#应用主库的日志，复制数据文件#Tue Nov 1 14:23:50 rsSync replSet initial sync pendingTue Nov 1 14:23:50 rsSync replSet syncing to: 10.250.7.220:27020Tue Nov 1 14:23:50 rsSync build index local.me _id: 1 Tue Nov 1 14:23:50 rsSync build index done 0 records 0.003 secsTue Nov 1 14:23:50 rsSync replSet initial sync drop all databasesTue Nov 1 14:23:50 rsSync dropAllDatabasesExceptLocal 1Tue Nov 1 14:23:50 rsSync replSet initial sync clone all databasesTue Nov 1 14:23:50 rsSync replSet initial sync cloning db: testTue Nov 1 14:23:50 FileAllocator allocating new datafile /opt/mongodata/r1/test.ns, filling with zeroes.Tue Nov 1 14:23:51 FileAllocator done allocating datafile /opt/mongodata/r1/test.ns, size: 16MB, took 0.8 secsTue Nov 1 14:23:51 FileAllocator allocating new datafile /opt/mongodata/r1/test.0, filling with zeroes.Tue Nov 1 14:23:55 FileAllocator done allocating datafile /opt/mongodata/r1/test.0, size: 64MB, took 3.643 secsTue Nov 1 14:23:55 FileAllocator allocating new datafile /opt/mongodata/r1/test.1, filling with zeroes.Tue Nov 1 14:23:55 rsSync build index test.yql _id: 1 Tue Nov 1 14:23:56 rsSync build index done 1 records 0.006 secsTue Nov 1 14:23:56 rsSync replSet initial sync query minValidTue Nov 1 14:23:56 rsSync replSet initial oplog application from 10.250.7.220:27020 starting at Nov 1 14:14:05:1 to Nov 1 14:14:05:1Tue Nov 1 14:23:57 rsSync replSet initial sync finishing upTue Nov 1 14:23:57 rsSync replSet set minValid=4eaf8e2d:1Tue Nov 1 14:23:57 rsSync build index local.replset.minvalid _id: 1 Tue Nov 1 14:23:57 rsSync build index done 0 records 0.023 secsTue Nov 1 14:23:57 rsSync replSet initial sync doneTue Nov 1 14:23:58 rsSync replSet syncing to: 10.250.7.220:27020Tue Nov 1 14:23:58 rsSync replSet SECONDARYTue Nov 1 14:24:02 FileAllocator done allocating datafile /opt/mongodata/r1/test.1, size: 128MB, took 7.428 secsTue Nov 1 14:24:16 clientcursormon mem (MB) res:16 virt:2848 mapped:1312Tue Nov 1 14:24:42 initandlisten connection accepted from 127.0.0.1:21141 #5Tue Nov 1 14:29:16 clientcursormon mem (MB) res:16 virt:2849 mapped:1312Tue Nov 1 14:34:16 clientcursormon mem (MB) res:16 virt:2913 mapped:1312Tue Nov 1 14:39:16 clientcursormon mem (MB) res:16 virt:2913 mapped:1312第五步：=下面是删除节点以后的日志=Tue Nov 1 14:39:28 conn2 end connection 10.250.7.220:54235Tue Nov 1 14:39:29 rsMgr replset msgReceivedNewConfig version: version: 3Tue Nov 1 14:39:29 rsMgr replSet info saving a newer config version to local.system.replsetTue Nov 1 14:39:29 rsMgr replSet saveConfigLocally doneTue Nov 1 14:39:29 rsMgr replSet error self not present in the repl set configuration:Tue Nov 1 14:39:29 rsMgr _id: myset, version: 3, members: _id: 0, host: 10.250.7.220:27018 , _id: 1, host: 10.250.7.220:27019 , _id: 2, host: 10.250.7.220:27020 -这是拷贝replica set myset 中其他节点的数据文件!(记住是数据文件，一定不要mongod.lock ，每个mongod进程都需要自己的数据目录，如果你要运行3个mongod的实例，那么就需要3个独自的目录。mongod启动的时候会在数据目录创建一个mongod.lock文件，阻止其他进程使用此目录.)第六步：#连接primary库Tue Nov 1 15:53:24 initandlisten connection accepted from 10.250.7.220:54761 #2Tue Nov 1 15:53:28 initandlisten connection accepted from 10.250.7.220:54763 #3Tue Nov 1 15:53:28 initandlisten connection accepted from 10.250.7.220:54764 #4Tue Nov 1 15:53:34 clientcursormon mem (MB) res:31 virt:2606 mapped:1232Tue Nov 1 15:53:34 rsStart trying to contact 10.250.7.220:27018Tue Nov 1 15:53:34 rsStart trying to contact 10.250.7.220:27019Tue Nov 1 15:53:34 rsStart trying to contact 10.250.7.220:27020第七步：#拷贝配置文件，并保存。Tue Nov 1 15:53:34 rsStart replSet got config version 6 from a remote, saving locallyTue Nov 1 15:53:34 rsStart replSet info saving a newer config version to local.system.replsetTue Nov 1 15:53:34 rsStart replSet saveConfigLocally doneTue Nov 1 15:53:34 rsStart replSet STARTUP2Tue Nov 1 15:53:34 rsMgr replSet total number of votes is even - add arbiter or give one member an extra voteTue Nov 1 15:53:34 rsSync replSet SECONDARYTue Nov 1 15:53:34 rsHealthPoll replSet info member 10.250.7.220:27018 is upTue Nov 1 15:53:34 rsHealthPoll replSet member 10.250.7.220:27018 is now in state SECONDARYTue Nov 1 15:53:34 rsHealthPoll replSet info member 10.250.7.220:27019 is upTue Nov 1 15:53:34 rsHealthPoll replSet member 10.250.7.220:27019 is now in state SECONDARYTue Nov 1 15:53:34 rsHealthPoll replSet info member 10.250.7.220:27020 is upTue Nov 1 15:53:34 rsHealthPoll replSet member 10.250.7.220:27020 is now in state PRIMARYTue Nov 1 15:53:34 rsMgr replSet cant see a majority, will not try to elect selfTue Nov 1 15:53:38 rsSync replSet syncing to: 10.250.7.220:27020 从上面的日志来看，这种方法初始化的速度比较快。当然考虑拷贝数据文件的时间，在大量数据的时候，我们可以选择里面一种方案！二第二种方法(向已有的replica set 添加新成员) 向已有的replica set 添加新成员是很简单的，新加的成员可以是空的。下面介绍一下如何添加新成员： 添加新成员时，必须在新的机器上先起来一个mongodb服务，必须指出要加入的replica set 集群的名字基本语法如下(其他是默认的)，然后再在replica set的master 库上执行添加操作：./mongod -dbpath=/opt/mongodata/r1 -port 27017 -replSet myset当然也可以使用下面的命令，将输出日志记录到/opt/mongodata/r1/rac3.27017.log 里面！mongodbrac3 bin$./mongod -dbpath=/opt/mongodata/r1 -port 27017 -replSet myset -logpath=/opt/mongodata/r1/rac3.27017.log -logappend &第一步：在主节点上执行添加操作mongodbrac4 bin$ ./mongo 127.0.0.1:27020MongoDB shell version: 2.0.1connecting to: 127.0.0.1:27020/testPRIMARY rs.status(); set : myset, date : ISODate(2011-11-01T06:13:01Z), myState : 1, syncingTo : 10.250.7.220:27018, members : _id : 0, name : 10.250.7.220:27018, health : 1, state : 2, stateStr : SECONDARY, uptime : 62668, optime : t : 1320066230000, i : 1 , optimeDate : ISODate(2011-10-31T13:03:50Z), lastHeartbeat : ISODate(2011-11-01T06:13:01Z), pingMs : 0 , _id : 1, name : 10.250.7.220:27019, health : 1, state : 2, stateStr : SECONDARY, uptime : 63887, optime : t : 1320066230000, i : 1 , optimeDate : ISODate(2011-10-31T13:03:50Z), lastHeartbeat : ISODate(2011-11-01T06:13:01Z), pingMs : 0 , _id : 2, name : 10.250.7.220:27020, health : 1, state : 1, stateStr : PRIMARY, optime : t : 1320066230000, i : 1 , optimeDate : ISODate(2011-10-31T13:03:50Z), self : true , ok : 1PRIMARY rs.add(10.250.7.241:27017); ok : 1 -添加成功添加之后，mongodb 会自动执行新加节点的恢复操作，所以第一次查询rs.s