No ifconfig in CentOS 7 Minimal Install
You can use the "yum provides" command to figure out what packages provide certain commands or files you're used to using.
yum provides ifconfig
The utility has been deprecated, but if you want to use it, just install net-tools.
yum -y install net-tools
Alternatively, you can get and manipulate your IP address using the ip command:
ip -s link