If you are used to changing /etc/sysconfig/network to set the hostnames in your chef scripts then think again for CentOS 7

to find out your hostname

hostnamectl

or for more information

hostnamectl status

You should get something like:-

Static hostname: vps418175.ovh.net
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 41227fcee63d4c579f21e742e4225972
           Boot ID: 10ffc5cab25c4fd58013480cef27bcff
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-514.21.1.el7.x86_64
      Architecture: x86-64

to permanently change your hostname

hostnamectl set-hostname Your-Hostname --static