CentOS 6 KVM添加網卡橋介面指令碼

指令碼任務

1，判斷網卡設定檔名稱為eth*或者是em* ，如dell伺服器網卡CentOS5為eth*，而CentOS6為em*。

2，存在幾個網卡就複製幾個原網卡設定檔做為橋設定檔，n的設定的數量是

3，如果超過4網卡則設定更高值，原設定檔是DHCP的改為static，用.*匹配行是存在CentOS5和6參數有引號的問題。

4， 產生虛擬機器橋借口br*並一一對應，如br0對應eth0，br1對應eth1等等，並重啟網路。 

#! /bin/sh
mypath="/etc/sysconfig/network-scripts"
for((n=0;n<=4;n++))
 do
  if [ -f "$mypath/ifcfg-eth$n" ]
  then
   sed -i "s/^ONBOOT.*/ONBOOT=yes/" $mypath/ifcfg-eth$n
   sed -i "s/^BOOTPROTO.*/BOOTPROTO=static/" $mypath/ifcfg-eth$n
   cp -a  $mypath/ifcfg-eth$n $mypath/ifcfg-br$n
   sed -i "/^HWADDR.*/d" $mypath/ifcfg-br$n
   sed -i "s/^DEVICE.*/DEVICE=br"$n"/" $mypath/ifcfg-br$n
   sed -i "s/^TYPE.*/TYPE=Bridge/" $mypath/ifcfg-br$n
   echo "BRIDGE=br$n">>$mypath/ifcfg-eth$n
   echo "The device br$n<---->eth$n is add success !"
  else
     echo "The device eth$n not exist!"
  fi
  if [ -f "$mypath/ifcfg-em$n" ]
   then
   sed -i "s/^ONBOOT.*/ONBOOT=yes/" $mypath/ifcfg-em$n
   sed -i "s/^BOOTPROTO.*/BOOTPROTO=static/" $mypath/ifcfg-em$n
   cp -a  $mypath/ifcfg-em$n $mypath/ifcfg-br$n
   sed -i "/^HWADDR.*/d" $mypath/ifcfg-br$n
   sed -i "s/^DEVICE.*/DEVICE=br"$n"/" $mypath/ifcfg-br$n
   sed -i "s/^TYPE.*/TYPE=Bridge/" $mypath/ifcfg-br$n
   echo "BRIDGE=br$n">>$mypath/ifcfg-em$n
   echo "The device br$n<---->em$n is add success !"
  else
   echo "The device em$n  not exist!"
fi
done
/etc/init.d/network restart