使用光盘作为yum源安装ifconfig等网络命令

# mkdir -p /mnt/cdrom
# 如果是光驱：mount -t iso9660 /dev/cdrom /mnt/cdrom/
# 如果是ISO：mount -o loop /usr/local/CentOS-7-x86_64-DVD-1611.iso /mnt/cdrom

# cd /etc/yum.repos.d/
# vi /etc/yum.repos.d/CentOS-CD.repo
    [CentOS-CD]
    name=CentOS-CD
    baseurl=file:///mnt/cdrom
    gpgcheck=0
    gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-CentOS-7
    enabled=1

# yum clean all

# yum update

# yum search ifconfig

# yum install net-tools.x86_64
    这个包里有ifconfig，netstat，whois等命令