I installed latest and greatest FreePBX from SNG7 [asterisk 14.7.5). All good.
I tried to install DRBD using the RHEL repositories [kmod-drbd84.x86_64 8.4.11-1.1.el7_6.elrepo] which all seemed to work find until the “modprobe drbd” returns “Module drbd not found”.
This is usually a snap to install on Centos 7 systems. Has SNG7 done something to Centos 7 to prevent DRBD?