MongoDB副本集配置系列五：副本集的在线迁移

MongoDB副本集的在线迁移

查看当前集群的状态：

{
	"setName" : "gechongrepl",
	"setVersion" : 11,
	"ismaster" : true,
	"secondary" : false,
	"hosts" : [
		"192.168.91.135:27017",
		"192.168.91.133:27017"
	],
	"arbiters" : [
		"192.168.91.144:27017"
	],
	"primary" : "192.168.91.135:27017",
	"me" : "192.168.91.135:27017",
	"maxBsonObjectSize" : 16777216,
	"maxMessageSizeBytes" : 48000000,
	"maxWriteBatchSize" : 1000,
	"localTime" : ISODate("2015-06-17T02:29:52.582Z"),
	"maxWireVersion" : 2,
	"minWireVersion" : 0,
	"ok" : 1
}

当前的副本集的状态为：

Primary:192.168.91.135:27017

Arbiters:192.168.91.144:27017

Secondary:192.168.91.133:27017

需求1：在副本集正常工作的情况下再添加一个节点。

1：模拟业务数据

gechongrepl:PRIMARY> db.test.count()
109000

　　

gechongrepl:PRIMARY> for (i=0;i<10000;i++) db.test.insert({uid:i,uname:'testmoveonline'+i});
WriteResult({ "nInserted" : 1 })
gechongrepl:PRIMARY> db.test.count()
119000
gechongrepl:PRIMARY>

查看从节点的状态：

gechongrepl:SECONDARY> rs.slaveOk()
gechongrepl:SECONDARY> db.test.count()
119000

2：把从节点关掉　　

gechongrepl:SECONDARY> use admin
switched to db admin
gechongrepl:SECONDARY> db.shutdownServer()

#查看当前的副本集的状态

gechongrepl:PRIMARY> rs.status()

#再次插入数据

gechongrepl:PRIMARY> for (i=0;i<10000;i++) db.test.insert({uid:i,uname:'testmoveonline12345'+i});
WriteResult({ "nInserted" : 1 })
gechongrepl:PRIMARY> db.test.count()
129000

　　

3：根据配置文件的配置，scpdata目录到新节点上。新节点IP为：192.168.91.132

[root@localhost mongodb]# scp -r ./data/ root@192.168.91.132:/root/software/mongodb/
root@192.168.91.132's password: 
local.0                                                                                                        100%   64MB  21.3MB/s   00:03    
local.1                                                                                                        100% 2047MB  21.8MB/s   01:34    
test.0                                                                                                         100%   64MB  21.3MB/s   00:03    
test.ns                                                                                                        100%   16MB  16.0MB/s   00:00    
mongod.lock                                                                                                    100%    0     0.0KB/s   00:00    
local.ns                                                                                                       100%   16MB  16.0MB/s   00:00    
[root@localhost mongodb]# ls
bin  data  GNU-AGPL-3.0  log  mongod.conf  README  THIRD-PARTY-NOTICES
[root@localhost mongodb]# scp -r ./log/ root@192.168.91.132:/root/software/mongodb/
root@192.168.91.132's password: 
mongod                                                                                                         100% 1101KB   1.1MB/s   00:00    
[root@localhost mongodb]# 

查看192.168.91.132主机上的MongoDB目录已经存在scp过来的文件

[root@localhost mongodb]# ls
bin  data  GNU-AGPL-3.0  log  mongod.conf  README  THIRD-PARTY-NOTICES

　

4：用scp过来的物理文件启动新节点

[root@localhost mongodb]# cd bin/
[root@localhost bin]# ./mongod --config /root/software/mongodb/mongod.conf 
about to fork child process, waiting until server is ready for connections.
forked process: 30944
child process started successfully, parent exiting

　　

5：在集群几点中加入新节点即可

gechongrepl:PRIMARY> rs.add("192.168.91.132:27017")

{
			"_id" : 6,
			"name" : "192.168.91.132:27017",
			"health" : 1,
			"state" : 6,
			"stateStr" : "UNKNOWN",
			"uptime" : 9,
			"optime" : Timestamp(0, 0),
			"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
			"lastHeartbeat" : ISODate("2015-06-17T02:49:43Z"),
			"lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),
			"pingMs" : 0,
			"lastHeartbeatMessage" : "still initializing"
		}

　　

6：remove刚才关掉的节点即可

gechongrepl:PRIMARY> rs.remove("192.168.91.133:27017")

　　

如此再次重复这样的步骤即可把集群慢慢的转移到其他服务器上。