MongoDB主从+php实现

环境

172.16.115.202   primary

172.16.111.171   secondary

172.16.115.157   secondary

一、mongoDB安装

1. yum下载安装monGodb

     扩展源Http://repo.mongodb.org/yum/redhat/mongodb-org-3.0.repo

     mongodb-org-3.0.7-1.el6.x86_64.rpm #元数据包，它可以实现自动安装下面的4个组件包

     mongodb-org-mongos-3.0.7-1.el6.x86_64.rpm # mongod守护程序，以及相关的配置和初始化脚本

     mongodb-org-server-3.0.7-1.el6.x86_64.rpm # mongos守护程序

     mongodb-org-shell-3.0.7-1.el6.x86_64.rpm # ongo shell环境

     mongodb-org-tools-3.0.7-1.el6.x86_64.rpm # MongoDB工具

2. 编辑配置文件vim  /etc/mongod.conf

    1）去掉以下两行以#开头的注释，以防重启报错

         fork:true

         pidFilePath:/var/mongodb/mongod.pid

    2）bind_ip绑定多个IP，用逗号隔开，如监听全部，留空即可

3. 修改配置参数，启动mongd

    echo never > /sys/kernel/mm/transparent_hugepage/enabled

    echo never > /sys/kernel/mm/transparent_hugepage/defrag

    编辑vim /etc/security/limits.conf，加入内容：

    mongod soft nofile 64000

    mongod hard nofile 64000

    mongod soft nproc 32000

    mongod hard nproc 32000

    service mongd start

    注：启动过程较慢，这是它在写数据/var/lib/mongo，如果启动不了，mongod -f /etc/mongod.conf方式，可以看到报错

4. 编辑三台机器的MongoDB配置文件vim /etc/mongod.conf，重启

    内容：

    ##1）去掉replication的注释

    ##2）加入下面参数(注意首行留空2个空格，固定格式)：

    ## 类似于二进制日志

       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 # 主上进入admin库

    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"}]}  #配置机器

    rs.initiate(config)  #刷新

    rs.status()   #查看状态

 如下结果：出现三台机器的信息，主的状态已变为PRIMARY

> 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）如执行rs.status()命令，没有发现三台机器，需手动执行添加

            rs.add("172.16.115.157")

            rs.add("172.16.111.171")

       2）如从机的状态为"stateStr":"STARTUP"，则需执行：

            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. 从上登录，状态已变为：SECONDARY

二、MongoDB主从测试

1. mongodb副本集测试

    1）主上建库，建集合

     use mydb

     db.createCollection('testA')

     show dbs

     show tables

    2）从上查看，已成功同步库和集合

     rs.slaveOk()

     show dbs

2. 副本集更改权重，模拟主宕机

   1）主上设置不同的权重，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()

       查看生效的权重：

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，模拟主宕机

        iptables -I INPUT -p tcp --dport 27017 -j DROP

        原主上：已连接失败

       原一台从机：状态已变为PRIMARY

       rs.status()查看状态：

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，创建一个库和集合

     use mydb2

     db.createCollection('testB')

4）恢复旧主，则自动切换为MASTER状态，并同步自己离线时新主上创建的库

      iptables -D INPUT -p tcp --dport 27017 -j DROP

三、MongoDB结合php

1. 下载安装mongo扩展模块

     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. 编辑php配置文件vim /etc/php.ini，加载扩展模块

3. 编辑测试文件 vim /usr/local/apache2/htdocs/1.php

    内容：

<?php
// 连接到mongodb
$m = new MongoClient();
echo "Connection to database successfully";
// 选择一个数据库
$db = $m->mydb;
echo "Database mydb selected";
?>

4. 测试 curl localhost/1.php