OpenShift concurrent connections

Question

According to OpenShift’s Knowledge Base, max amount of concurrent connections per gear is set at 10 requests and you can have a maximum of 16 gears. What if you want to provide a web service that needs to handle up to 5 million requests an hour (which is roughly 1150 per second)?

Answer 1

I contacted OpenShift Support and they commented as below:

The Bronze plan would be able to handle 256 concurrent connections (16 gears at 16 connections each = 256). However, with our Silver plan we're able to increase your maximum gear limit to fit your requirements.

Note: With scaling application 1 gear will be used up by database. So with Bronze plan you will be left with 15.

Answer 2

I also contacted them for current status on this issue. According to OpenShift support reply,

We do not exercise limiting concurrent connections to gears presently, so the actual limit will be defined by the resources use (number of gears and their sizes) and your code's efficiency.

Note that there could be some limits implemented into cartridges however, e.g. the MySQL add-on cartridge will limit the concurrent connections to the database server per the my.cnf configuration.

Sep 19, 2016