DRBD Not syncing between my nodes

You actually did not need to run sudo drbdadm -- --overwrite-data-of-peer primary all

AS long as /dev/drbdYou should have done the following

Step01) sudo service mysql stop on DRBD Primary so additional changes are not piled for DRBD to sync

Step02) sudo drbdadm connect all on DRBD Secondary

Step03) sudo cat /proc/drbd on DRBD Secondary to make sure the connection stats is WFConnection

Step04) sudo drbdadm connect all on DRBD Primary

Step05) sudo cat /proc/drbd on DRBD Primary to make sure the connection state is SyncTarget.

Step06) sudo service mysql stop on DRBD Primary so MySQL can get back up. The sync will continue. You do not have to wait for DRBD to be fully sync'd in Step 05.

CAVEAT

DRBD should not be used over a geographic distance. I work with setups that have DRBD pairs connect via CrossOver Cables over 192.168.x.x..

Try following:

On primary node

drbdadm connect all 

On secondary node

drbdadm -- --discard-my-data connect all