小脚本一则---CDH的批量部署中，如果是从ESXI的VCENTER的模板生成的虚拟机，如何快速搞定网络网络卡配置？

#!/bin/bash

#此脚本实现从ESXI新开模板之后，快速配置机器网络及MAC地址，涉及两个文件的更改

#定义常量

net_rule_file="/etc/udev/rules.d/70-persistent-net.rules"
net_conf_file="/etc/sysconfig/network-scripts/ifcfg-eth0"
netmask_conf="255.255.xxx.0"
gateway_conf="192.168.xxx.xx"
dns1_conf="114.xxx.xxx.114"
old_mac="00:50:56:xx:F6:xx"

#判断是否已正确执行过脚本，然后从文件中删除旧的MAC，更改为新的MAC地址,--eth0

if  (cat $net_rule_file|grep -i $old_mac) ;then
  new_mac_str=$(sed -n -e ‘/eth1/ p‘ $net_rule_file)
  #new_mac_1=${new_mac_str:64:17}
  new_mac=$(echo $new_mac_str| awk -F ‘,‘ {‘print $4‘}|awk -F ‘==‘ {‘print $2‘}|sed ‘s/\"//g‘)
  sed -i "/$old_mac/Id" $net_rule_file
  sed -i "s/eth1/eth0/g" $net_rule_file
else
  new_mac_str=$(sed -n -e ‘/eth0/ p‘ $net_rule_file)
  #new_mac_1=${new_mac_str:64:17}
  new_mac=$(echo $new_mac_str| awk -F ‘,‘ {‘print $4‘}|awk -F ‘==‘ {‘print $2‘}|sed ‘s/\"//g‘)
  echo "done 70-persistent-net.rules file!"
fi

#===================================
#将新的网络配置入写网卡文件，重启网络

if  (cat $net_conf_file|grep $netmask_conf) ;then
  echo "done /etc/sysconfig/network-scripts/ifcfg-eth0"
elif [ ! -n "$1" ] ;then
    echo "you have not input a ip address!"
else
  sed -i "/$old_mac/Id" $net_conf_file
  sed -i "s/dhcp/static/g" $net_conf_file
  echo "HWADDR=$new_mac" >> $net_conf_file
  echo "IPADDR=$1" >> $net_conf_file
  echo "NETMASK=$netmask_conf" >> $net_conf_file
  echo "GATEWAY=$gateway_conf" >> $net_conf_file
  echo "DNS1=$dns1_conf" >> $net_conf_file
  service network restart
fi