Mongodb之副本集的实现----repliSet
准备三个节点:
RS1:192.168.1.155:27017
RS2:192.168.1.11:27017
node1:192.168.1.112:27017
1、时间同步
ntpdate192.168.1.11
2、安装mongodb服务
rpm包地址:https://repo.mongodb.org/yum/redhat
yum –y localinstall*.rpm
mkdir –p/mongodb/data
chown –Rmongod:mongod /mongodb/data
usermod –d/mongodb/data mongod
3、修改配置文件
vim /etc/mongod.conf
#dbPath:/var/lib/mongo
dbPath: /mongodb/data
replication:启用这项
replSetName: testrs:给副本集定义一个名称
然后同步到另外两个节点
4、启动mongod服务
service mongodstart
选择192.168.1.155:27017这个服务登录
mongo
help---àrs.help()---àrs.initiate()用此命令进行初始化
发现报错如下:
该主机映射不到节点上,进行谷歌搜索查到原因,由于配置文件bindip绑定的是127.0.0.1上,而/etc/hosts文件中127.0.0.1余hostname---》RS1并没有指定关联于是做此修改
127.0.0.1 localhost localhost.localdomain localhost4localhost4.localdomain4 RS1
在最后加上hostname,于是重新初始化,发现果然解决问题
5、由于上步骤已经把服务都启动起来了,于是继续在192.168.1.155上进行添加主机
Rs.add(‘192.168.1.11:27017’)--à发现又报错,如下图
可以看出连接不上另外的节点,在155节点上进行尝试登陆
mongo --host 192.168.1.11 –port 27017发现还是登陆不上,翻看很多文章,描述的都不是很详细,于是一个群友解决了疑惑,由于配置文件中bindip并没有进行修改只是监听的127.0.0.1,在一个系统中配置三个实例mongodb这种方式可以不用修改,但是现在是三台不同的系统ip,于是得进行修改
net:
port: 27017
bindIp: 192.168.1.155将其他两个节点也进行修改,添加为本机ip,而不是127.0.0.1,(当然bindip也可以绑定多个ip:192.168.1.155 127.0.0.1)然后在hosts文件中加入:
192.168.1.155 RS1
192.168.1.11 RS2
192.168.1.112 node1
完成以上步骤之后,然后进行再次添加
rs.add(‘192.168.1.11:27017’)-à
testrs:PRIMARY>rs.add('192.168.1.11:27017')
{ "ok": 1 }:没有报错于是成功
然后再次添加下个节点
rs.add(‘192.168.1.112:27017’)
rs.status():进行查看节点间的状态
testrs:PRIMARY>rs.status()
{
"set" : "testrs",
"date" : ISODate("2016-07-26T04:21:32.729Z"),
"myState" : 1,
"term" : NumberLong(3),
"heartbeatIntervalMillis" :NumberLong(2000),
"members" : [
{
"_id" : 0,
"name" :"RS1:27017",
"health" : 1,
"state" : 1,
"stateStr" :"PRIMARY",:主节点
"uptime" : 346,
"optime" : {
"ts" :Timestamp(1469506890, 1),
"t" :NumberLong(3)
},
"optimeDate" :ISODate("2016-07-26T04:21:30Z"),
"electionTime" :Timestamp(1469506554, 1),
"electionDate" :ISODate("2016-07-26T04:15:54Z"),
"configVersion" : 3,
"self" : true
},
{
"_id" : 1,
"name" :"192.168.1.11:27017",
"health" : 1,
"state" : 2,
"stateStr" :"SECONDARY",:从节点
"uptime" : 156,
"optime" : {
"ts" :Timestamp(1469506735, 1),
"t" :NumberLong(3)
},
"optimeDate" :ISODate("2016-07-26T04:18:55Z"),
"lastHeartbeat" :ISODate("2016-07-26T04:21:30.870Z"),
"lastHeartbeatRecv" :ISODate("2016-07-26T04:21:30.974Z"),
"pingMs" :NumberLong(1),
"configVersion" : 2
},
{
"_id" : 2,
"name" : "192.168.1.112:27017",
"health" : 1,
"state" : 0,
"stateStr" :"STARTUP",:由于是刚刚添加,正在开启
"uptime" : 1,
"optime" : {
"ts" :Timestamp(0, 0),
"t" :NumberLong(-1)
},
"optimeDate" :ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" :ISODate("2016-07-26T04:21:31.165Z"),
"lastHeartbeatRecv" :ISODate("2016-07-26T04:21:32.498Z"),
"pingMs" :NumberLong(193),
"configVersion" : -2
}
],
"ok" : 1
}
至此,副本集已然完成,接下来就是验证主从是否同步?
6、在192.168.1.155:27017主节点上一次进行如下操作:
testrs:PRIMARY>use huangdb:切换到库
switched to dbhuangdb
testrs:PRIMARY>show collections
testcoll
testrs:PRIMARY>db.testcoll.find()
{"_id" : ObjectId("5792d2a3a4769176f5babaaa"),"Name" : "huang", "Age" : 24, "Gender": "F" }
testrs:PRIMARY>db.testcoll.insert({Name:"xiaoming",Age:23,url:"www.baidu.com"})
WriteResult({"nInserted" : 1 }):添加一条文档记录
testrs:PRIMARY>db.testcoll.find():查看文档记录
{"_id" : ObjectId("5792d2a3a4769176f5babaaa"),"Name" : "huang", "Age" : 24, "Gender": "F" }
{"_id" : ObjectId("5796e7333f3249e9b0b44ded"),"Name" : "xiaoming", "Age" : 23, "url": "www.baidu.com" }
然后在192.168.1.11:27017上这个系统进行登录验证
mongo –host 192.168.1.11–port 27017
use huangdb
show collections发现报错如下:
根据报错提示进行
rs.slaveOk()
然后进行查看
Db.testcoll.find()于是可以看见集合的内容记录,至此主从同步ok
7、接下来就是观察节点间能否进行failover故障转移
将192.168.1.155的mongod服务停止
[root@RS1 ~]#service mongod stop
Stoppingmongod: [确定]
于是在192.168.1.11上查看副本集状态
testrs:SECONDARY>rs.status()
{
"set" : "testrs",
"date" : ISODate("2016-07-26T05:06:39.686Z"),
"myState" : 2,
"term" : NumberLong(4),
"syncingTo" :"192.168.1.112:27017",
"heartbeatIntervalMillis" :NumberLong(2000),
"members" : [
{
"_id" : 0,
"name" :"RS1:27017",
"health" : 0,
"state" : 8,
"stateStr" :"(not reachable/healthy)",
"uptime" : 0,
"optime" : {
"ts" :Timestamp(0, 0),
"t" :NumberLong(-1)
},
"optimeDate" :ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" :ISODate("2016-07-26T05:06:39.641Z"),
"lastHeartbeatRecv" :ISODate("2016-07-26T05:05:58.844Z"),
"pingMs" :NumberLong(2),
"lastHeartbeatMessage": "Connection refused",
"configVersion" : -1
},
{
"_id" : 1,
"name" :"192.168.1.11:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 3019,
"optime" : {
"ts" :Timestamp(1469509568, 2),
"t" :NumberLong(4)
},
"optimeDate" :ISODate("2016-07-26T05:06:08Z"),
"syncingTo" :"192.168.1.112:27017",
"configVersion" : 3,
"self" : true
},
{
"_id" : 2,
"name" :"192.168.1.112:27017",
"health" : 1,
"state" : 1,
"stateStr" :"PRIMARY",
"uptime" : 2708,
"optime" : {
"ts" :Timestamp(1469509568, 2),
"t" :NumberLong(4)
},
"optimeDate" :ISODate("2016-07-26T05:06:08Z"),
"lastHeartbeat" :ISODate("2016-07-26T05:06:38.433Z"),
"lastHeartbeatRecv" :ISODate("2016-07-26T05:06:38.907Z"),
"pingMs" :NumberLong(1),
"electionTime" :Timestamp(1469509568, 1),
"electionDate" :ISODate("2016-07-26T05:06:08Z"),
"configVersion" : 3
}
],
"ok" : 1
}
根据状态可以看出192.168.1.155状态已经不健康了,而192.168.1.112从从节点劲升为了主节点,于是故障自动转移成功
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