Since IGL 7.2 do not support Red Hat Enterprise Linux version 5.x or 6.x. and only supports RHEL 7.2+
For Software Only Option:
We are currently running IGL 7.0.2 on RHEL 6 and we are working with our Internal Server teams for available options to move to RHEL 7 (Still figuring out In-place upgrade vs Migrate to new server options).
Since we are only deploying ear files on WebSphere. We are wondering – if we can still attempt to upgrade IGL from 7.0.2 version to IGL 7.2 on WAS 8.5.5 running on RHEL 6 and later migrate/upgrade OS to RHEL 7?
Application Server : WebSphere 8.5.5
OS : RHEL 6.10
IGL 7.0.2 Patch 07
I think the JDK version is the most critical factor and that will drive all your other choices.
Note1: The 7.2.0 installation guide has the following statement with regards to the JDK version for 7.2.0 on WebSphere.
Although it says Java 1.7 is supported, I am not aware of any supported combinations of WebSphere, Oracle JDBC and Oracle database versions that would allow for JDK 1.7. Customers should be strongly encouraged to use Java 1.8 with 7.2.0 product.
Note2: Although we do not make an operating system statement for RSA Identity Governance & Lifecycle 7.2.0 server on WebSphere we do make a statement about AFX. I am not aware of any issues with RHEL 6 but it would be best effort support.
You may wish to reach out to an RSA vendor for guidance on interpreting all of these requirements.