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環(huán)境
172.16.115.202 primary
172.16.111.171 secondary
172.16.115.157 secondary
一、MongoDB安裝
1. yum下載安裝mongodb
擴展源http://repo.mongodb.org/yum/redhat/mongodb-org-3.0.repo
mongodb-org-3.0.7-1.el6.x86_64.rpm #元數(shù)據(jù)包，它可以實現(xiàn)自動安裝下面的4個組件包
mongodb-org-mongos-3.0.7-1.el6.x86_64.rpm # mongod守護程序，以及相關的配置和初始化腳本
mongodb-org-server-3.0.7-1.el6.x86_64.rpm # mongos守護程序
mongodb-org-shell-3.0.7-1.el6.x86_64.rpm # ongo shell環(huán)境
mongodb-org-tools-3.0.7-1.el6.x86_64.rpm # MongoDB工具
2. 編輯配置文件vim /etc/mongod.conf
1）去掉以下兩行以#開頭的注釋，以防重啟報錯
fork:true
pidFilePath:/var/mongodb/mongod.pid
2）bind_ip綁定多個IP，用逗號隔開，如監(jiān)聽全部，留空即可
3. 修改配置參數(shù)，啟動mongd
echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag
編輯vim /etc/security/limits.conf，加入內(nèi)容：
mongod soft nofile 64000
mongod hard nofile 64000
mongod soft nproc 32000
mongod hard nproc 32000
service mongd start
注：啟動過程較慢，這是它在寫數(shù)據(jù)/var/lib/mongo，如果啟動不了，mongod -f /etc/mongod.conf方式，可以看到報錯
4. 編輯三臺機器的MongoDB配置文件vim /etc/mongod.conf，重啟
內(nèi)容：
##1）去掉replication的注釋
##2）加入下面參數(shù)(注意首行留空2個空格，固定格式)：
## 類似于二進制日志
oplogSizeMB: 20
## 副本集名字
replSetName: huangzhenping
5. 查看日志文件tail /var/log/mongodb/mongod.log
6. 主上配置，搭建副本集
use admin # 主上進入admin庫
config={_id:"huangzhenping",members:[{_id:0,host:"172.16.115.202:27017"},{_id:1,host:"172.16.115.157:27017"},{_id:2,host:"172.16.111.171:27017"}]} #配置機器
rs.initiate(config) #刷新
rs.status() #查看狀態(tài)
如下結(jié)果：出現(xiàn)三臺機器的信息，主的狀態(tài)已變?yōu)镻RIMARY
> rs.initiate(config)
{ "ok" : 1 }
huangzhenping:OTHER> rs.status()
{
"set" : "huangzhenping",
"date" : ISODate("2017-01-14T20:24:59.490Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "172.16.115.202:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 297,
"optime" : Timestamp(1484425453, 1),
"optimeDate" : ISODate("2017-01-14T20:24:13Z"),
"electionTime" : Timestamp(1484425455, 1),
"electionDate" : ISODate("2017-01-14T20:24:15Z"),
"configVersion" : 1,
"self" : true
},
{
"_id" : 1,
"name" : "172.16.115.157:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 45,
"optime" : Timestamp(1484425453, 1),
"optimeDate" : ISODate("2017-01-14T20:24:13Z"),
"lastHeartbeat" : ISODate("2017-01-14T20:24:57.851Z"),
"lastHeartbeatRecv" : ISODate("2017-01-14T20:24:58.343Z") ,
"pingMs" : 0,
"configVersion" : 1
},
{
"_id" : 2,
"name" : "172.16.111.171:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 45,
"optime" : Timestamp(1484425453, 1),
"optimeDate" : ISODate("2017-01-14T20:24:13Z"),
"lastHeartbeat" : ISODate("2017-01-14T20:24:57.863Z"),
"lastHeartbeatRecv" : ISODate("2017-01-14T20:24:58.262Z") ,
"pingMs" : 1,
"configVersion" : 1
}
],
"ok" : 1
}
huangzhenping:PRIMARY>注：
1）如執(zhí)行rs.status()命令，沒有發(fā)現(xiàn)三臺機器，需手動執(zhí)行添加
rs.add("172.16.115.157")
rs.add("172.16.111.171")
2）如從機的狀態(tài)為"stateStr":"STARTUP"，則需執(zhí)行：
var config={_id:"huangzhenping",members:[{_id:0,host:"172.16.115.202:27017"},{_id:1,host:"172.16.115.157:27017"},{_id:2,host:"172.16.111.171:27017"}]}
rs.initiate(config)
7. 從上登錄，狀態(tài)已變?yōu)椋篠ECONDARY
二、MongoDB主從測試
1. mongodb副本集測試
1）主上建庫，建集合
use mydb
db.createCollection('testA')
show dbs
show tables
2）從上查看，已成功同步庫和集合
rs.slaveOk()
show dbs
2. 副本集更改權重，模擬主宕機
1）主上設置不同的權重，并查看
cfg = rs.conf()
cfg.members[0].priority = 3
cfg.members[1].priority = 2
cfg.members[2].priority = 1
rs.reconfig(cfg)
rs.config()
查看生效的權重：
huangzhenping:PRIMARY> rs.config()
{
"_id" : "huangzhenping",
"version" : 2,
"members" : [
{
"_id" : 0,
"host" : "172.16.115.202:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 3,
"tags" : {
},
"slaveDelay" : 0,
"votes" : 1
},
{
"_id" : 1,
"host" : "172.16.115.157:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 2,
"tags" : {
},
"slaveDelay" : 0,
"votes" : 1
},
{
"_id" : 2,
"host" : "172.16.111.171:27017",
"arbiterOnly" : false,
"buildIndexes" : true,
"hidden" : false,
"priority" : 1,
"tags" : {
},
"slaveDelay" : 0,
"votes" : 1
}
],
"settings" : {
"chainingAllowed" : true,
"heartbeatTimeoutSecs" : 10,
"getLastErrorModes" : {
},
"getLastErrorDefaults" : {
"w" : 1,
"wtimeout" : 0
}
}
}2） 主上禁用27017端口，模擬主宕機
iptables -I INPUT -p tcp --dport 27017 -j DROP
原主上：已連接失敗
原一臺從機：狀態(tài)已變?yōu)镻RIMARY
rs.status()查看狀態(tài)：
huangzhenping:PRIMARY> rs.status()
{
"set" : "huangzhenping",
"date" : ISODate("2017-01-22T15:48:15.453Z"),
"myState" : 1,
"members" : [
{
"_id" : 0,
"name" : "172.16.115.202:27017",
"health" : 0,
"state" : 8,
"stateStr" : "(not reachable/healthy)",
"uptime" : 0,
"optime" : Timestamp(0, 0),
"optimeDate" : ISODate("1970-01-01T00:00:00Z"),
"lastHeartbeat" : ISODate("2017-01-22T15:48:14.551Z"),
"lastHeartbeatRecv" : ISODate("2017-01-22T15:48:14.632Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "Failed attempt to connect to 172.16.115.202:27017; couldn't connect to server 172.16.115.202:27017 (172.16.115.202), connection attempt failed",
"configVersion" : -1
},
{
"_id" : 1,
"name" : "172.16.115.157:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 16333,
"optime" : Timestamp(1484429320, 1),
"optimeDate" : ISODate("2017-01-14T21:28:40Z"),
"electionTime" : Timestamp(1485100022, 1),
"electionDate" : ISODate("2017-01-22T15:47:02Z"),
"configVersion" : 2,
"self" : true
},
{
"_id" : 2,
"name" : "172.16.111.171:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 5989,
"optime" : Timestamp(1484429320, 1),
"optimeDate" : ISODate("2017-01-14T21:28:40Z"),
"lastHeartbeat" : ISODate("2017-01-22T15:48:14.751Z"),
"lastHeartbeatRecv" : ISODate("2017-01-22T15:48:14.749Z"),
"pingMs" : 0,
"lastHeartbeatMessage" : "could not find member to sync from",
"configVersion" : 2
}
],
"ok" : 1
}3）新主上，創(chuàng)建一個庫和集合
use mydb2
db.createCollection('testB')
4）恢復舊主，則自動切換為MASTER狀態(tài)，并同步自己離線時新主上創(chuàng)建的庫
iptables -D INPUT -p tcp --dport 27017 -j DROP
三、MongoDB結(jié)合php
1. 下載安裝mongo擴展模塊
wget https://github.com/mongodb/mongo-php-driver-legacy/archive/master.zip
unzip mongo-php-driver-legacy-master.zip
cd mongo-php-driver-legacy-master
/usr/bin/phpize
./configure --with-php-config=/usr/bin/php-config
make;make install
2. 編輯php配置文件vim /etc/php.ini，加載擴展模塊
3. 編輯測試文件 vim /usr/local/apache2/htdocs/1.php
內(nèi)容：
<?php // 連接到mongodb $m = new MongoClient(); echo "Connection to database successfully"; // 選擇一個數(shù)據(jù)庫 $db = $m->mydb; echo "Database mydb selected"; ?>
4. 測試 curl localhost/1.php
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