MongoDB复制集之将现有的单节点服务器转换为复制集
服务器情况:
现有的单节点 Primary 192.168.126.9:27017
新增的节点 Secondry 192.168.126.8:27017
仲裁节点 ARBITER 192.168.126.8:27018
mongo 版本 3.2.4
1.停止单节点Primary的Mongo服务
1 > use admin; 2 switched to db admin 3 > db.shutdownServer()
2.重新启动Primary节点,使用--replSet的选项加上新复制集的名字 repl1
/usr/local/mongodb/bin/mongod -dbpath /sdb1/mongodb/data --fork --port 27017 --logpath /sdb1/mongodb/log/mongo.log --replSet repl1 --logappend
3.连接Primary数据库
4. 创建复制集配置信息对象
1 config = { _id:"repl1", members:[
2 {_id:0,host:"192.168.126.9:27017"}
3 ]
4 }5.初始化复制集并查看复制集的运行状态
1 > rs.initiate(config)
2 { "ok" : 1 }
3
4 repl1:SECONDARY> rs.status()
5 {
6 "set" : "repl1",
7 "date" : ISODate("2016-06-23T16:05:10.228Z"),
8 "myState" : 1,
9 "term" : NumberLong(1),
10 "heartbeatIntervalMillis" : NumberLong(2000),
11 "members" : [
12 {
13 "_id" : 0,
14 "name" : "192.168.126.9:27017",
15 "health" : 1,
16 "state" : 1,
17 "stateStr" : "PRIMARY",
18 "uptime" : 3524,
19 "optime" : {
20 "ts" : Timestamp(1466697870, 1),
21 "t" : NumberLong(1)
22 },
23 "optimeDate" : ISODate("2016-06-23T16:04:30Z"),
24 "infoMessage" : "could not find member to sync from",
25 "electionTime" : Timestamp(1466697868, 2),
26 "electionDate" : ISODate("2016-06-23T16:04:28Z"),
27 "configVersion" : 1,
28 "self" : true
29 }
30 ],
31 "ok" : 1
6.启动 Secondry Mongo节点服务
root@linux-mongo2:/home/Ubuntu# /usr/local/mongodb/bin/mongod -dbpath=/sdb1/mongodb/data --fork --port 27017 --logpath=/sdb1/mongodb/log/mongo.log --logappend --replSet repl1 about to fork child process, waiting until server is ready for connections. forked process: 2848 child process started successfully, parent exiting
7.在Primary节点将 Secondry Mongo节点添加到复制集里
repl1:PRIMARY> rs.add("192.168.126.8:27017")
{ "ok" : 1 }8.启动 ARBITER Mongo仲裁节点
root@linux-mongo2:/home/ubuntu# mkdir -p /sdb1/mongodb/arb root@linux-mongo2:/home/ubuntu# /usr/local/mongodb/bin/mongod -dbpath=/sdb1/mongodb/arb --fork --port 27018 --logpath=/sdb1/mongodb/arb/mongo.log --logappend --relpSet replSet repl1 Error parsing command line: unrecognised option '--relpSet' try '/usr/local/mongodb/bin/mongod --help' for more information root@linux-mongo2:/home/ubuntu# /usr/local/mongodb/bin/mongod -dbpath=/sdb1/mongodb/arb --fork --port 27018 --logpath=/sdb1/mongodb/arb/mongo.log --logappend -replSet repl1 about to fork child process, waiting until server is ready for connections. forked process: 3229 child process started successfully, parent exiting
9.在主节点将仲裁节点添加在复制集中,并查看最终的复制集状态
1 repl1:PRIMARY> rs.addArb("192.168.126.8:27018")
2 { "ok" : 1 }
3
4 repl1:PRIMARY> rs.status()
5 {
6 "set" : "repl1",
7 "date" : ISODate("2016-06-23T16:27:55.358Z"),
8 "myState" : 1,
9 "term" : NumberLong(1),
10 "heartbeatIntervalMillis" : NumberLong(2000),
11 "members" : [
12 {
13 "_id" : 0,
14 "name" : "192.168.126.9:27017",
15 "health" : 1,
16 "state" : 1,
17 "stateStr" : "PRIMARY",
18 "uptime" : 4889,
19 "optime" : {
20 "ts" : Timestamp(1466699268, 1),
21 "t" : NumberLong(1)
22 },
23 "optimeDate" : ISODate("2016-06-23T16:27:48Z"),
24 "electionTime" : Timestamp(1466697868, 2),
25 "electionDate" : ISODate("2016-06-23T16:04:28Z"),
26 "configVersion" : 3,
27 "self" : true
28 },
29 {
30 "_id" : 1,
31 "name" : "192.168.126.8:27017",
32 "health" : 1,
33 "state" : 5,
34 "stateStr" : "STARTUP2",
35 "uptime" : 1005,
36 "optime" : {
37 "ts" : Timestamp(0, 0),
38 "t" : NumberLong(-1)
39 },
40 "optimeDate" : ISODate("1970-01-01T00:00:00Z"),
41 "lastHeartbeat" : ISODate("2016-06-23T16:27:54.499Z"),
42 "lastHeartbeatRecv" : ISODate("2016-06-23T16:27:54.561Z"),
43 "pingMs" : NumberLong(0),
44 "syncingTo" : "192.168.126.9:27017",
45 "configVersion" : 3
46 },
47 {
48 "_id" : 2,
49 "name" : "192.168.126.8:27018",
50 "health" : 1,
51 "state" : 7,
52 "stateStr" : "ARBITER",
53 "uptime" : 6,
54 "lastHeartbeat" : ISODate("2016-06-23T16:27:54.499Z"),
55 "lastHeartbeatRecv" : ISODate("2016-06-23T16:27:53.632Z"),
56 "pingMs" : NumberLong(1),
57 "configVersion" : 3
58 }
59 ],
60 "ok" : 1
61 }注意: 这里副本集 192.168.126.8 的状态是 "STARTUP2" ,是由于Primary库的数据很大,导致一直处于初始化的同步数据阶段。
详细说明如下
"_id" : #集群中节点编号 "name" : #成员服务器名称及端口 "health" : #表示成员中的健康状态（0:down;1:up） "state" : #为1~11，表示成员的当前状态 "stateStr" : #描述该成员是主库（PRIMARY）还是备库（SECONDARY） "uptime" : #该成员在线时间（秒） "optime" : #成员最后一次应用日志(oplog)的信息 "optimeDate" : #成员最后一次应用日志(oplog)的时间 "electionTime" : #当前primary从操作日志中选举信息 "electionDate" : #当前primary被选定为primary的日期 "configVersion" : #mongodb版本 "self" : #为true 表示当前节点 其中 state 复制集状态: 复制集状态： STARTUP：刚加入到复制集中，配置还未加载 STARTUP2：配置已加载完，初始化状态 RECOVERING：正在恢复，不适用读 ARBITER: 仲裁者 DOWN：节点不可到达 UNKNOWN：未获取其他节点状态而不知是什么状态，一般发生在只有两个成员的架构，脑裂 REMOVED：移除复制集 ROLLBACK：数据回滚，在回滚结束时，转移到RECOVERING或SECONDARY状态 FATAL：出错。查看日志grep "replSet FATAL"找出错原因，重新做同步 PRIMARY：主节点 SECONDARY：备份节点
更多MongoDB相关教程见以下内容：
MongoDB 的详细介绍：请点这里
MongoDB 的下载地址：请点这里
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