Thanks Ingenthr and matthew. Ingenthr, yes I selected couchbase category because I thought this is a couchbase question. My bad.
Matthew, per your description, tier 1 is basically a web based application that client will connect to. So the tier 1 will connect to tier 2 (application php) and request for the information, tier 2 will then contact tier 3 to query the db and process the data before being served back to tier 1. Many thanks for the confirmation. Also, definitely will use PECL to install the sdk.
FYI, I know it’s not officially supported yet, but somehow I manage to install the 3.0.1 community edition on CentOS 7 without any problem. I’m not sure whether I should expect so see some sort of issue if I kept it on CentOS 7?
Many thanks everyone for the quick response. 