一、配置IP地址
进入到 目录， 修改ifcfg-em1文件：
[root@ccrfox141 ye]# cd /etc/sysconfig/network-scripts
[root@ccrfox141 network-scripts]# ls
ifcfg-em1 ifcfg-em4 ifcfg-p5p2 ifdown-eth ifdown-isdn ifdown-routes ifdown-TeamPort ifup-aliases ifup-ippp ifup-plip ifup-ppp ifup-Team ifup-wireless network-functions-ipv6
ifcfg-em2 ifcfg-lo ifdown ifdown-ippp ifdown-post ifdown-sit ifdown-tunnel ifup-bnep ifup-ipv6 ifup-plusb ifup-routes ifup-TeamPort init.ipv6-global
ifcfg-em3 ifcfg-p5p1 ifdown-bnep ifdown-ipv6 ifdown-ppp ifdown-Team ifup ifup-eth ifup-isdn ifup-post ifup-sit ifup-tunnel network-functions
[root@ccrfox141 network-scripts]# cat ifcfg-em1
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="em1"
UUID="087855f4-cfb1-4c45-8d85-60d4ea7f294f"
DEVICE="em1"
ONBOOT="yes"
IPADDR="172.16.0.141"
PREFIX="16"
GATEWAY="172.16.0.254"
DNS1="172.20.1.4"
IPV6_PRIVACY="no"
二、配置DNS
要访问DNS 服务器来进行查询，需要修改设置/etc/resolv.conf文件：
[root@ccrfox141 network-scripts]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 172.20.1.4
nameserver 180.76.76.76
要注意的是直接修改/etc/resolv.conf中的内容只是起临时作用，网络服务重启后系统是根据/etc/sysconfig/network-scripts/ifcfg-em1中的DNS选项来设置nameserver。要想永久有效在文件/etc/sysconfig/network-scripts/ifcfg-em1中添加选项：
DNS2="180.76.76.76"三、配置路由
[root@ccrfox141 network-scripts]# cat /etc/rc.local
#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.
route add -net 0.0.0.0 netmask 0.0.0.0 gw 172.16.0.135 dev em1 注意最小安装CentOS 7是没有route命令的，需要安装net-tools软件包。