Is it possible to install in Openshift free tier
No, it is not possible because OpenShift doesn't provide access to TCP and UDP ports required to receive data from trackers.
so only free option available now is "Amazon free tier".
Yes, as far a I know that's the only option.
hi Anton, after installed successfully in amazon, now started searching for other alternative.
one is openshift, as it support java too and allow us to install 3 gears for free (dont know exactly what it is)
https://www.openshift.com/
(own by redhat)