Q:

solution to force slave catch only dns update zone info from master dns / CentOS 7 / Bind 9

Bind 9 , CentoOS 7
Looking for a solution to force bind on slave dns server (cache only) to update zone records
or flush some how the dns cache to get new
Tried to restart bind on both servers
tried to increase serial on master
nothing seems to be working
any trick ? 

A:

If you update the serial on the master, with a default configuration, the slave should be notified and catch the change.  If not, have a look at also-notify configuration option of bind, but first make sure that DNS packets flow between the two (for notifies, AXFR, IXFR, etc.). 
You can use rndc on the slave (or through the network with the usual security caveats) to force the slave to reload the zone.  But it will probably not work if the serial is not correctly increased.