This is usually seen on Linux BMR in OnAPP with CentOS v7.x VM's (onapp makes some changes when booting into ISO's on CentOS v7.x)

Select the first recover option on boot - login with root and empty password.

Run "ifconfig -a" and check device name (ens3 is result in our example)

ip=IP nm=mask gw=getaway netdev=device name from ifconfig.

Example below

After boot you should now be able reach vm via network from the Clusterlogics GUI and can continue with the recovery process normally