1、 ifconfig查看当前网卡名称

[root@centos7 ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.32.128  netmask 255.255.255.0  broadcast 192.168.32.255
        inet6 fe80::fde7:2dd5:97b1:a7c7  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:03:c3:41  txqueuelen 1000  (Ethernet)
        RX packets 306442  bytes 405240153 (386.4 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 127058  bytes 11916470 (11.3 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

centos7网络配置文件在/etc/sysconfig/network-scripts目录下，ens33网卡对应的配置文件为ifcfg-ens33。使用vi编辑该文件如下:

[root@centos7 ~]# vi /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="static"         # 使用静态IP地址，默认为dhcp
IPADDR="192.168.241.100"   # 设置的静态IP地址
NETMASK="255.255.255.0"    # 子网掩码
GATEWAY="192.168.241.2"    # 网关地址
DNS1="192.168.241.2"       # DNS服务器
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="ens33"
UUID="95b614cd-79b0-4755-b08d-99f1cca7271b"
DEVICE="ens33"
ONBOOT="yes"             #是否开机启用

2、修改保存后，使用service network restart命令使静态IP地址生效

附录：

1、配置hostname的方法为 hostnamectl set-hostname （mini1）
2、配置IP地址映射域名为 vi /etc/hosts