如果使用ifconfig命令查看网卡信息是，没有反应，需要我们自己安装ifconfig
[root@localhost ~]# yum search all ifconfig
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * ......
python36-ifcfg.noarch : Python cross-platform network interface discovery (ifconfig/ipconfig/ip)
.................
python36-psutil.x86_64 : A process and system utilities module for Python

[root@localhost ~]# yum install -y net-tools
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
.............                               
Installed:
  net-tools.x86_64 0:2.0-0.25.20131004git.el7                                                        
Complete!

[root@localhost ~]# which ifconfig
/usr/sbin/ifconfig
[root@localhost ~]# ifconfig
em1: flags=4163  mtu 1500
      ........
lo: flags=73  mtu 65536
      ......
ovs-ext: flags=4163  mtu 1500
        inet6 fe80::480d:7fff:febb:9741  prefixlen 64  scopeid 0x20
       ..............
ovs-int: flags=4163  mtu 1500
        inet6 fe80::cce7:42ff:feee:3c4c  prefixlen 64  scopeid 0x20
        ...............
ovs-tun: flags=4163  mtu 1500
        inet6 2403:6a40:0:123:8c6a:64ff:fe08:344c  prefixlen 64  scopeid 0x0
       ...................
phy-ext: flags=4163  mtu 1500
      ...............
phy-int: flags=4163  mtu 1500
        ..............

以上就是安装ifconfig 教程
查看版本：cat /etc/redhat-release
升级系统：yum update
安装wget:yum -y install wget