Linux下IP设置脚本的实例及遇到问题解决办法

Linux下IP设置脚本的实例及遇到问题解决办法

背景

     一个Java web项目有一个功能是IP修改，Linux的IP修改脚本如下：

#!/bin/bash  #useing parameter ip:netmask:gateway:dns1  #system version:centos6,7/redhat6,7  #read parameter ipaddr=`echo $1|cut -d ":" -f 1` netmask=`echo $1|cut -d ":" -f 2` gateway=`echo $1|cut -d ":" -f 3` dns1=`echo $1|cut -d ":" -f 4` dns2=`echo $1|cut -d ":" -f 5` targetDevice=$2  #get device(active) name -- centos6 and centos7 DEVICE=`dmesg|grep Link|grep Up|cut -d ":" -f 3,4|cut -d " " -f 2|cut -d ":" -f 1|uniq|head -n 1` #if parameter has device name,use it ,else use first alive device if [ "$targetDevice" != "" ]; then   DEVICE=$targetDevice   echo 'device use target device :' $DEVICE fi  #backup net_file mv  /etc/sysconfig/network-scripts/'ifcfg-'$DEVICE  /etc/sysconfig/network-scripts/'ifcfg-'$DEVICE'.bak' -f  #config(net_file) cat <> /etc/sysconfig/network-scripts/'ifcfg-'$DEVICE DEVICE=$DEVICE ONBOOT=yes TYPE=Ethernet BOOTPROTO=none IPV6INIT=no DEFROUTE=yes IPADDR=$ipaddr GATEWAY=$gateway NETMASK=$netmask DNS1=$dns1 DNS2=$dns2 end  #update /etc/hosts cat /sensor/bin/standardhosts>/etc/hosts  echo '127.0.0.1 '$(hostname)>>/etc/hosts  #grant the net_file chmod 755 /etc/sysconfig/network-scripts/'ifcfg-'$DEVICE  #restart network /etc/init.d/network restart