Linux+Oracle 10g RAC双网卡绑定和解除绑定
在虚拟机VMware GSX Server上安装两套redhet Enterprise-R4-U4系统rac1和rac2，虚拟共享存储， 在此基础上搭建的oracle10g RAC环
一、软硬件环境概述
在虚拟机VMware GSX Server上安装两套redhet Enterprise-R4-U4系统rac1和rac2，虚拟共享存储， 在此基础上搭建的Oracle10g RAC环境。
1、 rac1两块网卡eth0：192.168.2.111，eth1：10.10.10.11
2、 rac2两块网卡eth0：192.168.2.112，eth1：10.10.10.12
/etc/hosts文件:
127.0.0.1
localhost
192.168.2.111
rac1.mycorpdomain.com
rac1
192.168.2.13
rac1-vip.mycorpdomain.com
rac1-vip
10.10.10.11
rac1-priv.mycorpdomain.com
rac1-priv
192.168.2.112
rac2.mycorpdomain.com
rac2
192.168.2.14
rac2-vip.mycorpdomain.com
rac2-vip
10.10.10.12
rac2-priv.mycorpdomain.com
rac2-priv
二、添加网卡eth2
1、 在rac1和rac2上分别以host-only的模式添加一块网卡
a、 Edit virtual machine
b、 Add进入add hardware wizard，下一步
c、 选择ethernet adapter 下一步
d、 选择host-only，完成
2、启动虚拟机，此时ifconfig –a可以看见多出了一个网卡eth2，只是没有IP地址，在network configuration图形界面的hardware选项页可以看见eth2，status为OK。
三、在rac1和rac2上停数据库和crs#cd /u01/app/oracle/product/10.2.0/crs_1/bin
停数据库实例
#./srvctl stop instance –d devdb –i ora.devdb.devd1.inst
#./srvctl stop instance –d devdb –i ora.devdb.devd2.inst
停数据库
#./srvctl stop database –d devdb
停ASM实例
#./srvctl stop asm –n rac1
#./srvctl stop asm –n rac2
停vip，gsd，listener，ons
#./srvctl stop nodeapps –n rac1
#./srvctl stop nodeapps –n rac2
四、更改网卡配置绑定网卡更改eth0和eth2的配置文件，将eth0和eth2绑定为一块虚拟网卡bond0.
1、 首先在/etc/sysconfig/network-scripts/下创建虚拟网卡bond0的配置文件ifcfg-bond0
#cd /etc/sysconfig/network-scripts/
#vi ifcfg-bond0
DEVICE=bond0
BOOTPROTO=none
BROADCAST=192.168.2。255
IPADDR=192.168.2.111
NETMASK=255.255.255.0
NETWORK=192.168.2.0
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
PEERDNS=yes
GATEWAY=192.168.168.250
IPV6INIt=no
2、 更改eth0的配置文件ifcfg-eth0，更改后的内容如下
Vi ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
MASTER=bond0
SLAVE=yes
3、 添加eth2的配置文件ifcfg-eth2
Vi ifcfg-eth2
DEVICE=eth2
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
MASTER=bond0
SLAVE=yes
4、 因为linux的虚拟网卡是在内核模块中实现的，所以需要安装的时候已经装好该module。在/etc/modules.conf文件中添加如下内容（如果没有该文件，则新建一个）：
alias bond0 bonding
options bond0 miimon=100 mode=0 primary=eth0
其中miimon=100表示每100ms检查一次链路连接状态，如果不通则会切换物理网卡，mode=1表示主备模式，也就是只有一块网卡是active的，只提供失效保护。如果mode=0则是负载均衡模式的，所有的网卡都是active，还有其他一些模式很少用到，primary=eth0表示主备模式下eth0为默认的active网卡
5、 在/etc/rc.local中加入modprobe bonding miimon=100 mode=0
6、 在rac2上也进行同样的修改
7、 重启后生效，，ifconfig -a查看可以发现多了bond0这个网卡，配置了原来eth0的ip配置，在network configuration的图形界面可以发现也多了bond0
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