mongodb副本集自动切换修复节点解决方案
副本集部署
1.启动mongod
在每台运行mongod服务的机器上增加配置文件/etc/mongodb-rs.conf，内容为：
[root@MongodbF-A etc]# vi /etc/mongodb-rs.conf
port = 27017
dbpath = /data/db
logpath = /log/log.log
fork = true
replSet = test
通过下面命令启动mongod:
[root@MongodbF-A etc]# /App/mongo/bin/mongod -f /etc/mongodb-rs.conf
about to fork child process, waiting until server is ready for connections.
all output going to: /log/log.log
log file [/log/log.log] exists; copied to temporary file [/log/log.log.2013-07-18T10-00-56]
forked process: 8513
child process started successfully, parent exiting
[root@MongodbF-A etc]#
[root@MongodbF-B App]# /App/mongo/bin/mongod -f /etc/mongodb-rs.conf
about to fork child process, waiting until server is ready for connections.
all output going to: /log/log.log
log file [/log/log.log] exists; copied to temporary file [/log/log.log.2013-07-18T10-00-06]
forked process: 8314
child process started successfully, parent exiting
[root@MongodbF-B App]#
[root@MongodbF-C App]# /App/mongo/bin/mongod -f /etc/mongodb-rs.conf
about to fork child process, waiting until server is ready for connections.
all output going to: /log/log.log
log file [/log/log.log] exists; copied to temporary file [/log/log.log.2013-07-18T10-06-38]
forked process: 8083
[Achild process started successfully, parent exiting
[root@MongodbF-C App]#
2. 修改每个机器的/etc/hosts
[root@MongodbF-A etc]# vim /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 MongodbF-A localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.168.155.224 mongodb1.example.net
192.168.155.225 mongodb2.example.net
192.168.155.226 mongodb3.example.net
~
2. 使用mongo shell连接mongod，进行配置:
[root@MongodbF-A etc]# /App/mongo/bin/mongo 192.168.155.224
MongoDB shell version: 2.4.5
connecting to: 192.168.155.224/test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
http://docs.mongodb.org/
Questions? Try the support group
http://groups.google.com/group/mongodb-user
> config = {_id:'test',members:[
... _id:0,host:'mongodb1.example.net'},
... _id:1,host:'mongodb2.example.net'},
Thu Jul 18 18:10:52.802 JavaScript execution failed: SyntaxError: Unexpected token :
> config = {_id:'test',members:[ _id:0,host:'mongodb1.example.net'}, _id:1,host:'mongodb2.example.net'},{_id:2,host:'mongodb3.example.net'}]}
Thu Jul 18 18:11:54.575 JavaScript execution failed: SyntaxError: Unexpected token :
> config_test={"_id":"test",members:[ --------------定义配置信息
... {_id:0,host:"mongodb1.example.net"},
... {_id:1,host:"mongodb2.example.net"},
... {_id:2,host:"mongodb3.example.net"}]
... }
{
"_id" : "test",
"members" : [
{
"_id" : 0,
"host" : "mongodb1.example.net"
},
{
"_id" : 1,
"host" : "mongodb2.example.net"
},
{
"_id" : 2,
"host" : "mongodb3.example.net"
}
]
}
>
> rs.initiate(config_test) -----启动副本集
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
test:STARTUP2>
test:STARTUP2>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY>
test:SECONDARY> rs.status()
{
"set" : "test",
"date" : ISODate("2013-07-18T10:19:03Z"),
"myState" : 2,
"members" : [
{
"_id" : 0,
"name" : "mongodb1.example.net:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 1087,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"self" : true
},
{
"_id" : 1,
"name" : "mongodb2.example.net:27017",
"health" : 1,
"state" : 5,
"stateStr" : "STARTUP2",
"uptime" : 44,
"optime" : Timestamp(0, 0),
"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" : ISODate("2013-07-18T10:18:56Z"),
"lastHeartbeatRecv" : ISODate("2013-07-18T10:18:54Z"),
"pingMs" : 273
},
{
"_id" : 2,
"name" : "mongodb3.example.net:27017",
"health" : 1,
"state" : 5,
"stateStr" : "STARTUP2",
"uptime" : 44,
"optime" : Timestamp(0, 0),
"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" : ISODate("2013-07-18T10:18:45Z"),
"lastHeartbeatRecv" : ISODate("2013-07-18T10:18:56Z"),
"pingMs" : 62
}
],
"ok" : 1
}
test:SECONDARY>
新成员初始状态为"stateStr" : "(not reachable/healthy)",然后变成"stateStr" : "STARTUP2",然后变成"stateStr" : "RECOVERING",最后当数据同步成功后，状态变为"stateStr" : "SECONDARY"。
test:SECONDARY> rs.status()
{
"set" : "test",
"date" : ISODate("2013-07-18T10:28:57Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "mongodb1.example.net:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1681,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"self" : true
},
{
"_id" : 1,
"name" : "mongodb2.example.net:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 638,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"lastHeartbeat" : ISODate("2013-07-18T10:28:55Z"),
"lastHeartbeatRecv" : ISODate("2013-07-18T10:28:55Z"),
"pingMs" : 0,
"syncingTo" : "mongodb1.example.net:27017"
},
{
"_id" : 2,
"name" : "mongodb3.example.net:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 638,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"lastHeartbeat" : ISODate("2013-07-18T10:28:56Z"),
"lastHeartbeatRecv" : ISODate("2013-07-18T10:28:56Z"),
"pingMs" : 0,
"syncingTo" : "mongodb1.example.net:27017"
}
],
"ok" : 1
}
test:PRIMARY>
3. 故障切换
假设224为Primary，其它为Secondary，则可以使用mongo shell连接224，看到下面结果
[root@MongodbF-B App]# /App/mongo/bin/mongo 192.168.155.224
MongoDB shell version: 2.4.5
connecting to: 192.168.155.224/test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
http://docs.mongodb.org/
Questions? Try the support group
http://groups.google.com/group/mongodb-user
test:PRIMARY> rs.isMaster()
{
"setName" : "test",
"ismaster" : true,
"secondary" : false,
"hosts" : [
"mongodb1.example.net:27017",
"mongodb3.example.net:27017",
"mongodb2.example.net:27017"
],
"primary" : "mongodb1.example.net:27017",
"me" : "mongodb1.example.net:27017",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"localTime" : ISODate("2013-07-18T10:30:33.734Z"),
"ok" : 1
}
test:PRIMARY>
同时可以连接225查看状态；
[root@MongodbF-C App]# /App/mongo/bin/mongo 192.168.155.225
MongoDB shell version: 2.4.5
connecting to: 192.168.155.225/test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
http://docs.mongodb.org/
Questions? Try the support group
http://groups.google.com/group/mongodb-user
test:SECONDARY> rs.isMaster()
{
"setName" : "test",
"ismaster" : false,
"secondary" : true,
"hosts" : [
"mongodb2.example.net:27017",
"mongodb3.example.net:27017",
"mongodb1.example.net:27017"
],
"primary" : "mongodb1.example.net:27017",
"me" : "mongodb2.example.net:27017",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"localTime" : ISODate("2013-07-18T10:32:03.170Z"),
"ok" : 1
}
test:SECONDARY>
我们停止224的mongod，然后发现已经mongo shell连接不上，而通过另外两个成员可以看到副本集的状态：
[root@MongodbF-A etc]# kill 8513
[root@MongodbF-A etc]# /App/mongo/bin/mongo 192.168.155.224
MongoDB shell version: 2.4.5
connecting to: 192.168.155.224/test
Thu Jul 18 18:38:08.920 JavaScript execution failed: Error: couldn't connect to server 192.168.155.224:27017 at src/mongo/shell/mongo.js:L114
exception: connect failed
[root@MongodbF-A etc]#
停掉了；
然后查看225，226状态；
[root@MongodbF-C App]# /App/mongo/bin/mongo 192.168.155.226
MongoDB shell version: 2.4.5
connecting to: 192.168.155.226/test
test:PRIMARY> rs.status()
{
"set" : "test",
"date" : ISODate("2013-07-18T10:39:19Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "mongodb1.example.net:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"lastHeartbeat" : ISODate("2013-07-18T10:39:17Z"),
"lastHeartbeatRecv" : ISODate("2013-07-18T10:38:35Z"),
"pingMs" : 0
},
{
"_id" : 1,
"name" : "mongodb2.example.net:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 1222,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"lastHeartbeat" : ISODate("2013-07-18T10:39:18Z"),
"lastHeartbeatRecv" : ISODate("2013-07-18T10:39:19Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "syncing to: mongodb3.example.net:27017",
"syncingTo" : "mongodb3.example.net:27017"
},
{
"_id" : 2,
"name" : "mongodb3.example.net:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1961,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"self" : true
}
],
"ok" : 1
}
test:PRIMARY>
225中：
test:SECONDARY> rs.isMaster()
{
"setName" : "test",
"ismaster" : false,
"secondary" : true,
"hosts" : [
"mongodb2.example.net:27017",
"mongodb3.example.net:27017",
"mongodb1.example.net:27017"
],
"primary" : "mongodb3.example.net:27017",
"me" : "mongodb2.example.net:27017",
"maxBsonObjectSize" : 16777216,
"maxMessageSizeBytes" : 48000000,
"localTime" : ISODate("2013-07-18T10:38:59.686Z"),
"ok" : 1
}
test:SECONDARY>
看到故障切换成功；
故障修复后，重启查看状态；
[root@MongodbF-A etc]# /App/mongo/bin/mongod -f /etc/mongodb-rs.conf
about to fork child process, waiting until server is ready for connections.
all output going to: /log/log.log
forked process: 8891
log file [/log/log.log] exists; copied to temporary file [/log/log.log.2013-07-18T10-40-36]
child process started successfully, parent exiting
[root@MongodbF-A etc]# /App/mongo/bin/mongo 192.168.155.224
MongoDB shell version: 2.4.5
connecting to: 192.168.155.224/test
test:SECONDARY> rs.status()
{
"set" : "test",
"date" : ISODate("2013-07-18T10:40:48Z"),
"myState" : 2,
"syncingTo" : "mongodb3.example.net:27017",
"members" : [
{
"_id" : 0,
"name" : "mongodb1.example.net:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 12,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"errmsg" : "syncing to: mongodb3.example.net:27017",
"self" : true
},
{
"_id" : 1,
"name" : "mongodb2.example.net:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 12,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"lastHeartbeat" : ISODate("2013-07-18T10:40:48Z"),
"lastHeartbeatRecv" : ISODate("2013-07-18T10:40:47Z"),
"pingMs" : 0,
"syncingTo" : "mongodb3.example.net:27017"
},
{
"_id" : 2,
"name" : "mongodb3.example.net:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 12,
"optime" : Timestamp(1374142698, 1),
"optimeDate" : ISODate("2013-07-18T10:18:18Z"),
"lastHeartbeat" : ISODate("2013-07-18T10:40:48Z"),
"lastHeartbeatRecv" : ISODate("2013-07-18T10:40:48Z"),
"pingMs" : 1
}
],
"ok" : 1
}
test:SECONDARY>
启动成功成为了secondary了
至此，副本集的故障切换完成；
test:SECONDARY> rs.config()
{
"_id" : "test",
"version" : 1,
"members" : [
{
"_id" : 0,
"host" : "mongodb1.example.net:27017"
},
{
"_id" : 1,
"host" : "mongodb2.example.net:27017"
},
{
"_id" : 2,
"host" : "mongodb3.example.net:27017"
}
]
}
test:SECONDARY>
4、尝试在SECONDARY上插入数据；
test:SECONDARY> db.song.insert({"name":"xixi"})
not master
test:SECONDARY>
返回not master。所以必须使用驱动连接到PRIMARY上进行操作，必须在应用上对这种故障切换做进一步控制，保证是对PRIMARY进行操作。
test:PRIMARY> db.song.insert({"name":"xixi"})
test:PRIMARY> db.song.find()
{ "_id" : ObjectId("51e7c776ec806afa1810aeff"), "name" : "xixi" }
test:SECONDARY> show tables;
Thu Jul 18 18:46:24.018 JavaScript execution failed: error: { "$err" : "not master and slaveOk=false", "code" : 13435 } at src/mongo/shell/query.js:L128
test:SECONDARY>
可以通过rs.slaveOk()命令使该SECONDARY可以进行读操作：
test:SECONDARY> show tables;
Thu Jul 18 18:46:24.018 JavaScript execution failed: error: { "$err" : "not master and slaveOk=false", "code" : 13435 } at src/mongo/shell/query.js:L128
test:SECONDARY> rs.slaveOk()
test:SECONDARY> show tables;
song
system.indexes
test:SECONDARY> db.song.find()
{ "_id" : ObjectId("51e7c776ec806afa1810aeff"), "name" : "xixi" }
test:SECONDARY> db.song.insert({"name":"xixi"}) -----只读，不能写的类型；
not master
test:SECONDARY>
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