linux IP固化

今天遇到将DHCP分配的IP设置成static的方式，故在此记录一下，shell脚本：

1.centos:

#!/bin/bash
function getIp(){
   sleep 5
   default_route=$(ip route show)
   default_interface=$(echo $default_route | sed -e 's/^.*dev \([^ ]*\).*$/\1/' | head -n 1)
   address=$(ip addr show label $default_interface scope global | awk '$1 == "inet" { print $2,$4}')
   #ip address
   ip=$(echo $address | awk '{print $1 }')
   ip=${ip%%/*}
}

while [ ${#ip} -eq 0 ];
do
    getIp
done;

#broadcast
broadcast=$(echo $address | awk '{print $2 }')

#mask address
mask=$(route -n |grep 'U[ \t]' | head -n 1 |awk '{print $3}')


#gateway address
gateway=$(route -n | grep 'UG[ \t]' | awk '{print $2}')

#dns
dns=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2}')
echo ip:$ip,mask:$mask,broadcast:$broadcast,gateway:$gateway,dns:$dns
echo 'auto eth0' >/etc/network/interfaces
echo 'iface eth0 inet static'>>/etc/network/interfaces
echo address $ip>>/etc/network/interfaces
echo netmask $mask>>/etc/network/interfaces
echo gateway $gateway>>/etc/network/interfaces
echo nameserver $dns >>/etc/resolv.conf
/etc/init.d/networking restart

2.ubuntu:

#!/bin/bash

default_route=$(ip route show)
default_interface=$(echo $default_route | sed -e 's/^.*dev \([^ ]*\).*$/\1/' | head -n 1)
address=$(ip addr show label $default_interface scope global | awk '$1 == "inet" { print $2,$4}')


#ip address
ip=$(echo $address | awk '{print $1 }')
ip=${ip%%/*}


#broadcast
broadcast=$(echo $address | awk '{print $2 }')

#mask address
mask=$(route -n |grep 'U[ \t]' | head -n 1 |awk '{print $3}')


#gateway address
gateway=$(route -n | grep 'UG[ \t]' | awk '{print $2}')

#dns
dns=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2}')
echo ip:$ip,mask:$mask,broadcast:$broadcast,gateway:$gateway,dns:$dns
echo 'auto eth0' >/etc/network/interfaces
echo 'iface eth0 inet static'>>/etc/network/interfaces
echo address $ip>>/etc/network/interfaces
echo netmask $mask>>/etc/network/interfaces
echo gateway $gateway>>/etc/network/interfaces
echo nameserver $dns >>/etc/resolv.conf
/etc/init.d/networking restart