前言
在实际生产环境中，大部分的数据库都是以集群模式存在，来降低性能压力，Oracle从9i起推出了实时应用集群（RAC Real Application Cluster），使得这一可能变成了现实，Oracle RAC是真正意义上的HA高可用+LB负载均衡，让我们来看一下
虚拟存储
Oracle RAC需要一套独立的共享存储，才能保证数据的一致性与完整性，当然，我们在练习环境是买不起存储的，555，所以呢，有一款非常好用的软件满足了我们的需求，那就是FreeNAS，我们先来看一下他的安装
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470093wU61.png"></a>
开启虚拟机选择自定义模式，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470095Zutw.png"></a>
选择VMware 9的版本，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470097XIyT.png"></a>
选择稍后安装操作系统，点击Next继续
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操作系统选择其他，从下拉框中找到FreeBSD，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470099anDS.png"></a>
根据实际情况确定名称与路径，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470100cudv.png"></a>
根据实际情况确定CPU个数与内核数，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470102ZC3v.png"></a>
设置内存大小，最小256M，建议512M，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_136247010357Js.png"></a>
根据实际情况确定网络模式，点击Next继续
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确定I/O控制器模式，点击Next继续
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选择新建一个虚拟磁盘，点击Next继续
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磁盘类型选择SCSI模式，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470109dK7X.png"></a>
OS空间一般说来有2G足矣，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470110MHi5.png"></a>
确定磁盘文件名称，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470112FNk4.png"></a>
确定无误后，点击Finish完成
增加存储磁盘
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选择更改虚拟机配置
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选择Add按钮后，选择Hard Disk，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470116GJH9.png"></a>
选择创建一个新的虚拟磁盘，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470117Hcgb.png"></a>
选择SCSI模式硬盘，使用物理硬盘格式，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_13624701206D2v.png"></a>
硬盘选择20G一个，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470122Fx82.png"></a>
确定虚拟磁盘文件名，点击Finish完成
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470122AbAX.png"></a>
点击Advanced按钮进行一些配置
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将磁盘顺序放到节点1:0上，点击OK按钮
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470126LOcO.png"></a>
如上述操作，根据自己实际情况配置磁盘（最少不要低于3块，建议5块起），完成后点击OK按钮
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_13624701273Bt4.png"></a>
选择好磁盘镜像后，点击启动虚拟机，出现上图所示欢迎页面后，直接回车即可
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键入9回车，安装系统
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选择第三项，安装全部的系统到硬盘
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确认无误，点击OK
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确认光驱无误后，点击OK
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使用第一块磁盘做为OS系统安装盘（即2G那块盘，千万别搞错^_^）
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空间不得低于380M，这里熊熊分了512M，点击OK继续
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选择Yes分配交换分区
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交换分区同样也给他512M
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完成后，点击回车继续
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选择Exit退出
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470140Orpt.png"></a>
取出光盘镜像后，选择第7项重启
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确定重启，选择Yes后回车，开始重启系统
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重启后，选择第2项来配置网络IP
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不使用DHCP模式，选择No回车
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根据实际情况配置所需的IP地址，点击OK回车
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根据实际情况配置掩码，点击OK回车
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根据实际情况配置网关IP，点击OK回车
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470145ezzO.png"></a>
根据实际情况配置DNS地址，点击OK回车
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470145e51O.png"></a>
无需IPv6支持，点击No回车
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470146FUpa.png"></a>
配置完成后，同样选择7来重启，使新IP生效
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470147QpcZ.png"></a>
在浏览器上输入刚才设置好的IP，默认用户名为admin，密码是freenas，点击login登录
在系统（System）——常规（General）里进行一些基本修改（包括域名、地域、时间等等）
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470149bCFv.png"></a>
在硬盘——管理中将那几块20G的硬盘都挂上（注意使用软RAID模式），然后点击应用更改使其全部成为在线状态
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470150HGmg.png"></a>
在硬盘——软RAID中将所有硬盘都作为RAID5，完成后会变成COMPLETE状态
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470152KdqF.png"></a>
在服务——iSCSI服务的目标里将设备增加
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470154uTax.png"></a>
在设置中启动设备，拉到最下面保存并重启服务
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点击服务可以看到iSCSI服务已经启动，至此，FreeNAS安装配置完毕
安装Centos系统
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选择高级选项，点击Next继续
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选择VMware9.0版本，点击Next继续
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<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470161q6EW.png"></a>
操作系统选择Linux，在版本里选择Centos，点击Next继续
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根据实际情况设置虚拟机名称与存放路径，点击Next继续
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确定CPU个数与CPU内核数，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_13624701646W9J.png"></a>
根据实际需求设置内存大小，最低不要低于1G，建议2G起，点击Next继续
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根据实际需求确定网络连接模式，点击Next继续
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确定I/O控制器类型，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470168MHbq.png"></a>
创建一个新的虚拟磁盘，点击Next继续
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选择磁盘类型，点击Next继续
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因为数据都存储在共享存储上，本地无需太大，20G即可，建议30G，稍微富裕点，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_13624701726G5G.png"></a>
确定虚拟磁盘文件名，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470173nIaK.png"></a>
添加另一块网卡，使用Host-only模式
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470173rIZA.png"></a>
正式安装系统
开启新建的虚拟机
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470175tcAg.png"></a>
在引导页面直接回车即可
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470176FrJy.png"></a>
无需检查磁盘镜像，点击Skip跳过
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470179VQdQ.png"></a>
在欢迎页面点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470181h1m1.png"></a>
选择默认英文语言，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470183dlu1.png"></a>
选择美式英语键盘，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470186WCpJ.png"></a>
选择自定义安装模式，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470188FfJs.png"></a>
使用自动分区（LVM），点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_13624701903hVa.png"></a>
选择删除所有分区，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470193ie3O.png"></a>
确定LVM分区，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470196ceiF.png"></a>
确定boot引导，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470199NJUt.png"></a>
根据实际情况配置IP与主机名等网络信息，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_13624702017fou.png"></a>
关闭防火墙与SELinux，点击Next继续
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语言支持里增加简体中文，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470209Oocx.png"></a>
时区选择亚洲上海，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470211zCu0.png"></a>
设置root密码，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_13624702143AyW.png"></a>
图省事，选择所有的安装包，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470216avfo.png"></a>
安装完毕后，取出镜像，点击Rebot重启
配置Centos系统
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470220Ab25.png"></a>
重启后，在欢迎页面点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470222PF8U.png"></a>
同意授权，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470225o0Fl.png"></a>
使用NTP时间模式，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470227E1lh.png"></a>
确定分辨率大小，点击Next继续
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暂不设置其他系统用户，点击Next继续
<a href="http://bearlovecat.blog.51cto.com/attachment/201303/5/1293914_1362470232nOPQ.png"></a>
暂不添加其他软件包，点击Next继续
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确定完成完整，点击Next继续
本文转自bear_cat51CTO博客，原文链接： http://blog.51cto.com/bearlovecat/1147624，如需转载请自行联系原作者
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