Jira is designed to install successfully on all 'flavours' of Linux, we only test the JIRA Linux Installer on CentOS Linux. If you encounter problems with the JIRA Linux Installer on your particular flavour of Linux, we recommend installing JIRA on Linux from an archive file.
I believe the same is to Confluence.
However, if you wish, on [this link|https://confluence.atlassian.com/display/JIRA/Supported+Platforms] you can find all details about supported platforms to JIRA. [On this another one|https://confluence.atlassian.com/display/DOC/Supported+Platforms] you can find details about Confluence.
Remember that Java is an attempt at a "platform independent" system, and plugins live within the application. If you can run JIRA or Confluence on a system, then it is almost impossible to construct an addon for them that will not run within them because of the operating system (unless you do something really dumb like make operating-specific system calls outside the Java API) I have only *ever* run into one issue where a plugin behaved differently because of the operating system - I wrote a plugin that worked perfectly on all types of Linux, but had a bug that only occurred when installed in a JIRA running on Windows. It was actually down to a bug in Windows, and a later version of Java had a work-around for it, so my plugin started working when we updated Java. To add a minor point to what Renato says - CentOS is as close to RedHat as you can get without actually being RedHat.
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