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Mongodb復(fù)制集由一組Mongod實(shí)例（進(jìn)程）組成，包含一個(gè)Primary節(jié)點(diǎn)和多個(gè)Secondary節(jié)點(diǎn)，Mongodb Driver（客戶端）的所有數(shù)據(jù)都寫入Primary，Secondary從Primary同步寫入的數(shù)據(jù)，以保持復(fù)制集內(nèi)所有成員存儲相同的數(shù)據(jù)集，提供數(shù)據(jù)的高可用。
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準(zhǔn)備工作
軟件環(huán)境
OS：Oracle Linux 6.5
MongoDB:mongodb3.2.3
部署架構(gòu)
模擬有三臺服務(wù)器
10.1.5.123:28001 主節(jié)點(diǎn)
10.1.5.123:28002 從節(jié)點(diǎn)
10.1.5.123:28003 選舉節(jié)點(diǎn)
復(fù)制集架構(gòu)：一主，一從，一選舉節(jié)點(diǎn)
下載安裝
下載地址：https://www.mongodb.org/downloads
mongodb-linux-x86_64-rhel62-3.2.3.tgz
部署步驟
1.創(chuàng)建目錄及用戶
[root@devtest mongodb]# mkdir conf data log
[root@devtest data]# mkdir 28001 28002 28003
--創(chuàng)建mongo用戶
[root@devtest conf]# groupadd mongod
[root@devtest conf]# useradd -g mongod mongod
2.創(chuàng)建配置文件 –配置三個(gè)實(shí)例的配置文件（修改相應(yīng)的端口號即可）
–節(jié)點(diǎn)1
$ vi /home/mongod/mongodb3.2.3/conf/28001.conf
port=28001
bind_ip=10.1.5.123
logpath=/home/mongod/mongodb3.2.3/log/28001.log
dbpath=/home/mongod/mongodb3.2.3/data/28001/
logappend=true
pidfilepath=/home/mongod/mongodb3.2.3/data/28001/28001.pid
fork=true
oplogSize=1024
replSet=MyMongo
–節(jié)點(diǎn)2
$ vi /home/mongod/mongodb3.2.3/conf/28002.conf
port=28002
bind_ip=10.1.5.123
logpath=/home/mongod/mongodb3.2.3/log/28002.log
dbpath=/home/mongod/mongodb3.2.3/data/28002/
logappend=true
pidfilepath=/home/mongod/mongodb3.2.3/data/28002/28002.pid
fork=true
oplogSize=1024
replSet=MyMongo
–節(jié)點(diǎn)3
$ vi /home/mongod/mongodb3.2.3/conf/28003.conf
port=28003
bind_ip=10.1.5.123
logpath=/home/mongod/mongodb3.2.3/log/28003.log
dbpath=/home/mongod/mongodb3.2.3/data/28003/
logappend=true
pidfilepath=/home/mongod/mongodb3.2.3/data/28003/28003.pid
fork=true
oplogSize=1024
replSet=MyMongo
3.啟動mongo復(fù)制集
$ mongod -f /home/mongod/mongodb3.2.3/conf/28001.conf
$ mongod -f /home/mongod/mongodb3.2.3/conf/28002.conf
$ mongod -f /home/mongod/mongodb3.2.3/conf/28003.conf
4.初始化復(fù)制集
[mongod@devtest ~]$ mongo 10.1.5.123:28001/admin
MongoDB shell version: 3.2.3
connecting to: 10.1.5.123:28001/admin
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
\> db
admin
\> config = {
... "_id":"MyMongo",
... members:[
...{"_id":0,host:"10.1.5.123:28001"},
...{"_id":1,host:"10.1.5.123:28002"},
... {"_id":2,host:"10.1.5.123:28003"}]
... }
{
"id" : "MyMongo",
"members" : [
? {
? "_id" : 0,
? "host" :"10.1.5.123:28001"
? },
? {
? "_id" : 1,
? "host" :"10.1.5.123:28002"
? },
? {
? "_id" : 2,
? "host" :"10.1.5.123:28003"
? }
]
}
–查看復(fù)制集成員
\> config.members
[
{
? "_id" : 0,
? "host" :"10.1.5.123:28001"
},
{
? "_id" : 1,
? "host" :"10.1.5.123:28002"
},
{
? "_id" : 2,
? "host" :"10.1.5.123:28003"
}
]
–把節(jié)點(diǎn)3修改為arbiter選舉節(jié)點(diǎn)
\> config.members[2]
{ "_id" : 2, "host" :"10.1.5.123:28003" }
\> config.members[2] ={"_id":2,"host":"10.1.5.123:28003",arbiterOnly:true}
{ "id" : 0, "host" :"10.1.5.123:28003", "arbiterOnly" : true }
–進(jìn)行復(fù)制集初始化
\> rs.initiate(config)
{ "ok" : 1 }
–查看復(fù)制集狀態(tài)
MyMongo:OTHER> rs.status()
{
? "set" : "MyMongo",
? "date" :ISODate("2016-03-15T09:42:47.643Z"),
? "myState" : 1,
? "term" : NumberLong(1),
? "heartbeatIntervalMillis" :NumberLong(2000),
? "members" : [
? {
? "_id" : 0,
? "name" :"10.1.5.123:28001",
? "health" : 1,
? "state" : 1,
? "stateStr" :"PRIMARY",
? "uptime" :1812,
? "optime" : {
? "ts": Timestamp(1458034899, 1),
? "t" :NumberLong(1)
? },
? "optimeDate": ISODate("2016-03-15T09:41:39Z"),
? "infoMessage": "could not find member to sync from",
? "electionTime" : Timestamp(1458034898, 1),
? "electionDate": ISODate("2016-03-15T09:41:38Z"),
? "configVersion" : 1,
? "self" : true
? },
? {
? "_id" : 1,
? "name" :"10.1.5.123:28002",
? "health" : 1,
? "state" : 2,
? "stateStr" :"SECONDARY",
? "uptime" :80,
? "optime" : {
? "ts": Timestamp(1458034899, 1),
? "t" :NumberLong(1)
? },
? "optimeDate": ISODate("2016-03-15T09:41:39Z"),
? "lastHeartbeat" :ISODate("2016-03-15T09:42:46.947Z"),
? "lastHeartbeatRecv" :ISODate("2016-03-15T09:42:46.445Z"),
? "pingMs" :NumberLong(0),
? "syncingTo" :"10.1.5.123:28001",
? "configVersion" : 1
? },
? {
? "_id" : 2,
? "name" :"10.1.5.123:28003",
? "health" : 1,
? "state" : 7,
? "stateStr" :"ARBITER",
? "uptime" :80,
? "lastHeartbeat" :ISODate("2016-03-15T09:42:46.946Z"),
? "lastHeartbeatRecv" :ISODate("2016-03-15T09:42:44.428Z"),
? "pingMs" :NumberLong(0),
? "configVersion": 1
? }
? ],
? "ok" : 1
}
MyMongo:PRIMARY>
\5. 驗(yàn)證復(fù)制集同步 分別登錄兩從節(jié)點(diǎn)查看登錄狀態(tài)，分別為secondary和arbite
下面登錄從secondary節(jié)點(diǎn)進(jìn)行測試：
在從節(jié)點(diǎn)進(jìn)行查詢時(shí)報(bào)下面的錯(cuò)誤，因?yàn)樵谀J(rèn)情況下，不通過驅(qū)動連接mongodb從節(jié)點(diǎn)數(shù)據(jù)庫時(shí)，如果不開始slaveOK=true，是無法讀取從節(jié)點(diǎn)數(shù)據(jù)的。
[mongod@devtest conf]$ mongo10.1.5.123:28002/admin
MongoDB shell version: 3.2.3
connecting to:10.1.5.123:28002/admin
MyMongo:SECONDARY> show dbs
2016-03-15T17:49:47.854+0800 EQUERY [thread1] Error: listDatabasesfailed:{ "ok" : 0, "errmsg" : "not master andslaveOk=false", "code" : 13435 } :
_getErrorWithCode@src/mongo/shell/utils.js:23:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:53:1
shellHelper.show@src/mongo/shell/utils.js:700:19
shellHelper@src/mongo/shell/utils.js:594:15
@(shellhelp2):1:1
MyMongo:SECONDARY>rs.slaveOk(true)
MyMongo:SECONDARY> show dbs
local 0.000GB
test 0.000GB
MyMongo:SECONDARY> use test
switched to db test
MyMongo:SECONDARY> showtables
t1
MyMongo:SECONDARY>db.t1.find()
{ "_id" :ObjectId("56e7dc310ebd75f9ef3546c1"), "name" :"licz" }
下面登錄從arbite節(jié)點(diǎn)進(jìn)行測試：
然后登錄arbite節(jié)點(diǎn)，會發(fā)現(xiàn)數(shù)據(jù)沒有同步，因?yàn)閍rbite不參與數(shù)據(jù)庫的同步，即不存儲數(shù)據(jù)
但local數(shù)據(jù)庫大小已經(jīng)改變了，因?yàn)閘ocal庫存儲命名空間（local.ns文件）的內(nèi)容。
MyMongo:ABITER> rs.slaveOk(true)
MyMongo:ARBITER> show dbs
local 0.000GB
6.模擬主-從故障切換 –殺掉當(dāng)前主節(jié)點(diǎn)為28001端口
[mongod@devtest ~]$ ps -ef|grep mongo
root 7186 7150 0 09:15 pts/2 00:00:00 su - mongod
mongod 7187 7186 0 09:15 pts/2 00:00:00 -bash
mongod 7306 7187 0 09:16 pts/2 00:00:00 ps -ef
mongod 7307 7187 0 09:16 pts/2 00:00:00 grep mongo
mongod 16253 1 2 Mar15 ? 00:22:00 mongod -f/home/mongod/mongodb3.2.3/conf/28001.conf
mongod 16299 1 2 Mar15 ? 00:21:50 mongod -f/home/mongod/mongodb3.2.3/conf/28002.conf
mongod 16345 1 2 Mar15 ? 00:20:05 mongod -f/home/mongod/mongodb3.2.3/conf/28003.conf
[mongod@devtest ~]$ kill -9 16253
–發(fā)現(xiàn)主節(jié)點(diǎn)已經(jīng)切換至28002端口
[mongod@devtest ~]$ mongo 10.1.5.123:28002/admin
MongoDB shell version: 3.2.3
connecting to: 10.1.5.123:28002/admin
MyMongo:PRIMARY>
–再次啟動28001端口并登錄，發(fā)現(xiàn)28001已為從節(jié)點(diǎn)
[mongod@devtest ~]$ mongod -f /home/mongod/mongodb3.2.3/conf/28001.conf
about to fork child process, waiting untilserver is ready for connections.
forked process: 21410
child process started successfully, parentexiting
[mongod@devtest ~]$ mongo 10.1.5.123:28001/admin
MongoDB shell version: 3.2.3
connecting to: 10.1.5.123:28001/admin
MyMongo:SECONDARY>
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