Centos下安装MongoDB复制集

时间  2019-11-19
标签 centos 安装 mongodb 复制 栏目 CentOS 繁體版
原文   原文链接

在一台Centos下模拟安装MongoDB的复制集mongodb

准备三份配置文件：shell

mongod.confapp

bind_ip=0.0.0.0
port = 27017
dbpath = /usr/local/mongo/data/
logpath = /usr/local/mongo/log/mongod.log
fork=true
logappend=true
replSet=myMongoSet

mongod2.confui

bind_ip=0.0.0.0
port = 27018
dbpath = /usr/local/mongo/data2/
logpath = /usr/local/mongo/log2/mongod.log
fork=true
logappend=true
replSet=myMongoSet

mongod3.confthis

bind_ip=0.0.0.0
port = 27019
dbpath = /usr/local/mongo/data3/
logpath = /usr/local/mongo/log3/mongod.log
fork=true
logappend=true
replSet=myMongoSet

进入bin目录下分别启动三台mongo实例spa

./mongod -f ../conf/mongod.conf 
./mongod -f ../conf/mongod2.conf 
./mongod -f ../conf/mongod3.conf

查看进程，验证三台MongoDB实例是否启动成功rest

[root@192 conf]# ps -ef | grep mongod
root        559 130632  0 14:53 pts/1    00:00:00 grep --color=auto mongod
root     130957      1  0 14:37 ?        00:00:04 ./mongod -f ../conf/mongod.conf
root     130986      1  0 14:37 ?        00:00:04 ./mongod -f ../conf/mongod2.conf
root     131014      1  0 14:37 ?        00:00:04 ./mongod -f ../conf/mongod3.conf

说明三台MongoDB实例已经启动成功code

链接第一台mongoserver

./mongo 192.168.15.31:27017/admin

准备初始化实例进程

> config={_id:"myMongoSet",members:[{_id:0,host:"192.168.15.31:27017"},{_id:1,host:"192.168.15.31:27018"},{_id:2,host:"192.168.15.31:27019"}]}
{
	"_id" : "myMongoSet",
	"members" : [
		{
			"_id" : 0,
			"host" : "192.168.15.31:27017"
		},
		{
			"_id" : 1,
			"host" : "192.168.15.31:27018"
		},
		{
			"_id" : 2,
			"host" : "192.168.15.31:27019"
		}
	]
}

定义config内容为集群的实例信息

> rs.initiate(config)

初始化复制集

执行后输出以下：

{
	"ok" : 1,
	"operationTime" : Timestamp(1517640358, 1),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1517640358, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}

说明MongoDB的复制集建立成功

查看复制集状态

myMongoSet:SECONDARY> rs.status()
{
	"set" : "myMongoSet",
	"date" : ISODate("2018-02-03T06:46:09.449Z"),
	"myState" : 1,
	"term" : NumberLong(1),
	"heartbeatIntervalMillis" : NumberLong(2000),
	"optimes" : {
		"lastCommittedOpTime" : {
			"ts" : Timestamp(0, 0),
			"t" : NumberLong(-1)
		},
		"appliedOpTime" : {
			"ts" : Timestamp(1517640358, 1),
			"t" : NumberLong(-1)
		},
		"durableOpTime" : {
			"ts" : Timestamp(1517640358, 1),
			"t" : NumberLong(-1)
		}
	},
	"members" : [
		{
			"_id" : 0,
			"name" : "192.168.15.31:27017",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 546,
			"optime" : {
				"ts" : Timestamp(1517640358, 1),
				"t" : NumberLong(-1)
			},
			"optimeDate" : ISODate("2018-02-03T06:45:58Z"),
			"infoMessage" : "could not find member to sync from",
			"electionTime" : Timestamp(1517640368, 1),
			"electionDate" : ISODate("2018-02-03T06:46:08Z"),
			"configVersion" : 1,
			"self" : true
		},
		{
			"_id" : 1,
			"name" : "192.168.15.31:27018",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 10,
			"optime" : {
				"ts" : Timestamp(1517640358, 1),
				"t" : NumberLong(-1)
			},
			"optimeDurable" : {
				"ts" : Timestamp(1517640358, 1),
				"t" : NumberLong(-1)
			},
			"optimeDate" : ISODate("2018-02-03T06:45:58Z"),
			"optimeDurableDate" : ISODate("2018-02-03T06:45:58Z"),
			"lastHeartbeat" : ISODate("2018-02-03T06:46:08.931Z"),
			"lastHeartbeatRecv" : ISODate("2018-02-03T06:46:05.733Z"),
			"pingMs" : NumberLong(0),
			"configVersion" : 1
		},
		{
			"_id" : 2,
			"name" : "192.168.15.31:27019",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 10,
			"optime" : {
				"ts" : Timestamp(1517640358, 1),
				"t" : NumberLong(-1)
			},
			"optimeDurable" : {
				"ts" : Timestamp(1517640358, 1),
				"t" : NumberLong(-1)
			},
			"optimeDate" : ISODate("2018-02-03T06:45:58Z"),
			"optimeDurableDate" : ISODate("2018-02-03T06:45:58Z"),
			"lastHeartbeat" : ISODate("2018-02-03T06:46:08.932Z"),
			"lastHeartbeatRecv" : ISODate("2018-02-03T06:46:05.734Z"),
			"pingMs" : NumberLong(0),
			"configVersion" : 1
		}
	],
	"ok" : 1,
	"operationTime" : Timestamp(1517640358, 1),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1517640368, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}

验证数据同步：

链接27017实例：

myMongoSet:PRIMARY>use stu
myMongoSet:PRIMARY> db.stuinfo.insert({"name":"张三","age":12,"address":"山东"})

查询添加的内容：

myMongoSet:PRIMARY> db.stuinfo.find()
{ "_id" : ObjectId("5a755b6a4dfb8ddaa17bad20"), "name" : "张三", "age" : 12, "address" : "山东" }

进入27018实例：

myMongoSet:SECONDARY> db.stuinfo.find()
Error: error: {
	"operationTime" : Timestamp(1517641210, 1),
	"ok" : 0,
	"errmsg" : "not master and slaveOk=false",
	"code" : 13435,
	"codeName" : "NotMasterNoSlaveOk",
	"$clusterTime" : {
		"clusterTime" : Timestamp(1517641210, 1),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}

查看信息，可能会报如上问题，这是由于MongoDB的salve默认是不容许读写的。 解决方法：

myMongoSet:SECONDARY> rs.slaveOk()

查看信息是否同步：

myMongoSet:SECONDARY> use stu
switched to db stu
myMongoSet:SECONDARY> db.stuinfo.find()
{ "_id" : ObjectId("5a755b6a4dfb8ddaa17bad20"), "name" : "张三", "age" : 12, "address" : "山东" }

链接实例27019，执行一样的操做。 因而可知，数据信息能够正确同步， 到此为止，MongoDB的复制集搭建成功

验证主从切换：

如今主节点是27017节点，咱们杀掉该进程

[root@192 bin]# ps -ef | grep mongod
root        659 130632  0 15:05 pts/1    00:00:00 grep --color=auto mongod
root     130957      1  0 14:37 ?        00:00:08 ./mongod -f ../conf/mongod.conf
root     130986      1  0 14:37 ?        00:00:08 ./mongod -f ../conf/mongod2.conf
root     131014      1  0 14:37 ?        00:00:08 ./mongod -f ../conf/mongod3.conf
[root@192 bin]# kill 130957
[root@192 bin]# ps -ef | grep mongod
root        674 130632  0 15:05 pts/1    00:00:00 grep --color=auto mongod
root     130986      1  0 14:37 ?        00:00:08 ./mongod -f ../conf/mongod2.conf
root     131014      1  0 14:37 ?        00:00:08 ./mongod -f ../conf/mongod3.conf

该进程已经被杀掉

而后链接27018节点

[root@192 bin]# ./mongo 192.168.15.31:27018
MongoDB shell version v3.6.2
connecting to: mongodb://192.168.15.31:27018/test
MongoDB server version: 3.6.2
Server has startup warnings: 
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] 
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] 
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] 
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] 
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-02-03T14:37:09.007+0800 I CONTROL  [initandlisten] 
myMongoSet:PRIMARY>

能够看出，27018节点已经成为主节点

而后从新开启27017节点

[root@192 bin]# ./mongod -f ../conf/mongod.conf 
about to fork child process, waiting until server is ready for connections.
forked process: 703
child process started successfully, parent exiting

链接27017节点

[root@192 bin]# ./mongo 192.168.15.31:27017
MongoDB shell version v3.6.2
connecting to: mongodb://192.168.15.31:27017/test
MongoDB server version: 3.6.2
Server has startup warnings: 
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] 
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] 
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] 
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] 
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] **        We suggest setting it to 'never'
2018-02-03T15:07:54.488+0800 I CONTROL  [initandlisten] 
myMongoSet:SECONDARY>

27017节点已经成为从节点

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