Upgrading from CentOS 5.5 & OpenNMS 1.8.10

Hi All,

I will be upgrading an opennms server.
Currently it is running CentOS 5.5 (Final) and OpenNMS 1.8.10. (Just a 
bit long in the tooth...)
I am looking for the path of least resistance...

I am wondering if the latest stable release will run well on that 
version of CentOS.
Can anybody give me some feedback on the best approach?

1. Just upgrade ONMS and Java on the current system (will this even work?)
     Will this require many other components to be upgraded 
independently of the OS? (e.g. Postgres)
2. Dump the DB, upgrade the OS and ONMS, put the DB back and see what 
happens.
     Any suggestions as to whether CentOS 6 or 7 is best at this time?
3. Start completely from scratch.
     Again, CentOS 6 or 7?

Thanks!!!
Dan



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