CentOS7 解决网卡乱序的问题：
   1.#cd /etc/udev/rules.d/
   2.#vim 70-persistent-net.rules:
   修改70-persistent-net.rules的内容：
   SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:1f:1a:f5", KERNEL=="eth*", NAME="eth0"
   修改后：
  SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:1f:1a:eb", KERNEL=="eth*", NAME="eth0"
  SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:1f:1a:f5", KERNEL=="eth*", NAME="eth1"
  SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:1f:1a:ff", KERNEL=="eth*", NAME="eth2"
  3.在网卡的配置文件里面加入HWADDR="52:54:00:F0:F9:1C"。
  4.重启服务器：
  #reboot