Linux:自动获取静态IP地址,清空iptable,修改selinux脚本

自动获取静态IP地址,清空iptable,修改selinux脚本

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环境:VMware

平台:centos6.8全新

功能:

　　1)应用ifconfig -a,route -n,cat /etc/resolv.conf命令获取IP,掩码,网关,dns并自动填写到/etc/sysconfig/network-scripts/ifcfg-eth0.

　　2)清空iptables规则.

　　3)关闭selinux.

应用:适用全新系统　　

#!/bin/bash
#本脚本是自动获取静态IP地址,并修改selin和清空iptables.
#日期:2017-3-21
#编写:WK
#定义检查函数,错误和正确会显示红字并闪烁.
check() {
if [ $? != 0 ]
then 
       echo -e 'e[1;5;31m ERROR e[0m'
        exit 1
else
        echo -e 'e[1;5;31m OK e[0m'
fi
}
#释放IP并查看IP地址
dhclient -r
ifconfig -a >/dev/null
dhclient
check
#截取IP,网关,掩码,dns段.
ip=`ifconfig -a |grep -A1 'eth0' |sed '1d'|awk -F ':' '{print $2}'|awk '{print $1}'`
gateway=`route -n |awk '{print $2}'|sed '1,3d'`
netmask=`route -n |awk '{print $3}'|sed '1,2d'|sed 2d`
dns1=`cat /etc/resolv.conf |awk '{print $2}'|sed 1d|sed 2d`
dns2=`cat /etc/resolv.conf |awk '{print $2}'|sed 1d|sed 1d`
eth0="/etc/sysconfig/network-scripts/ifcfg-eth0"
#修改ONBOOT和BOOTPROTO
sed -i 's/ONBOOT=no/ONBOOT=yes/' $eth0
sed -i 's/BOOTPROTO=dhcp/BOOTPROTO=static/' $eth0
check
#判断地址段是否存在,若存在删除并重新填入,若不存在直接填写(写的比较繁琐)
if `grep -q 'IPADDR' $eth0 `
then
        sed -i '/^IP/d' $eth0
        echo "IPADDR=$ip" >>$eth0
else
        echo "IPADDR=$ip" >>$eth0
fi
check
if `grep -q  'GATEWAY' $eth0`
then
        sed -i '/^GATE/d' $eth0
        echo "GATEWAY=$gateway" >>$eth0
else
        echo "GATEWAY=$gateway" >>$eth0
fi
check
if `grep -q 'NETMASK' $eth0`
then
        sed -i '/^NET/d' $eth0
        echo "NETMASK=$netmask" >>$eth0
else
        echo "NETMASK=$netmask" >>$eth0
fi
check
if `grep -q  'DNS1' $eth0`
then
        sed -i '/^DNS1/d' $eth0
        echo "DNS1=$dns1" >>$eth0
else
        echo "DNS1=$dns1" >>$eth0
fi
check
if `grep -q  'DNS2' $eth0`
then
         sed -i '/^DNS2/d' $eth0
        echo "DNS2=$dns2" >>$eth0
else
        echo "DNS2=$dns2" >>$eth0
fi
check
#重启网卡
service network restart
check
#关闭selinux
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
selinux_s=`getenforce`
if [ $selinux_s ==  "enforcing" ]
then
        setenforce 0
fi
check
#保存并清空iptables
iptables-save > /etc/sysconfig/iptables_`date +%s`
iptables -F
service iptables save
check
#检查网络是否通畅
ping -c 5 www.qq.com
check
echo "-------------------------------->"
echo -e "33[4;33mYour IP address is-->$ip33[0m" 

 执行结果图