centos 7 静态IP，指定DNS

cd /etc/sysconfig/network-scripts/

找到对应的网卡，配置并编辑

ls -l

vim ifcfg-em1

配置例子：

TYPE="Ethernet"

#BOOTPROTO="dhcp"

BOOTPROTO=static

#配置静态IP，网关，子网掩码

IPADDR=192.168.42.4

NETMASK=255.255.255.0

GATEWAY=192.168.42.254

#取消networkmanager 管理

NM_CONTROLLED=no

DEFROUTE="yes"

IPV4_FAILURE_FATAL="no"

IPV6INIT="yes"

IPV6_AUTOCONF="yes"

IPV6_DEFROUTE="yes"

IPV6_FAILURE_FATAL="no"

NAME="em1"

UUID="24d12c22-f60d-4701-8105-a20f784b2825"

DEVICE="em1"

ONBOOT="yes"

PEERDNS="yes"

PEERROUTES="yes"

IPV6_PEERDNS="yes"

IPV6_PEERROUTES="yes"

IPV6_PRIVACY="no"

NM_CONTROLLED=no表示该接口不通过网络管理器进行管理，而是通过配置文件管理。

“ONBOOT=yes”表示系统将在启动时开启该接口。

配置完静态IP后重启网络服务

systemctl restart network.service

接下来配置DNS切到networkmanager目录

cd /etc/NetworkManager/

修改 NetworkManager.conf配置文件，设定为不通过网络管理器管理

vim NetworkManager.conf
增加dns=none

修改resolv.conf,

vim /etc/resolv.conf

新增dns配置

#主DNS

nameserver 203.186.94.20
#备DNS

nameserver 203.186.96.33
#备DNS2
nameserver 8.8.8.8

转载http://www.centoscn.com/CentOS/config/2017/0508/8773.html

*************************************************快速一览**********************************************************************************************

cd /etc/sysconfig/network-scripts/
ls -l
vim ifcfg-em1

echo 'TYPE="Ethernet" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo '#BOOTPROTO="dhcp" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'BOOTPROTO=static ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo '#配置静态IP，网关，子网掩码 ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPADDR=192.168.42.4 ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'NETMASK=255.255.255.0 ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'GATEWAY=192.168.42.254 ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo '#取消networkmanager 管理 ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'NM_CONTROLLED=no ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'DEFROUTE="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPV4_FAILURE_FATAL="no" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPV6INIT="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPV6_AUTOCONF="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPV6_DEFROUTE="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPV6_FAILURE_FATAL="no" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'NAME="em1" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'UUID="24d12c22-f60d-4701-8105-a20f784b2825" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'DEVICE="em1" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'ONBOOT="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'PEERDNS="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'PEERROUTES="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPV6_PEERDNS="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPV6_PEERROUTES="yes" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo 'IPV6_PRIVACY="no" ' >> /etc/sysconfig/network-scripts/ifcfg-em1
echo '#配置完静态IP后重启网络服务 ' >> /etc/sysconfig/network-scripts/ifcfg-em1

systemctl restart network.service

配置networkmanager目录
echo 'dns=none" >> /etc/NetworkManager/NetworkManager.conf

修改
echo '#新增dns配置' > /etc/resolv.conf
echo '#主DNS ' >> /etc/resolv.conf
echo 'nameserver 203.186.94.20' >> /etc/resolv.conf
echo '#备DNS ' >> /etc/resolv.conf
echo 'nameserver 203.186.96.33' >> /etc/resolv.conf
echo '#备DNS2' >> /etc/resolv.conf
echo 'nameserver 8.8.8.8' >> /etc/resolv.conf