Migration from RHEL 4 to RHEL 6

[uxravi]

Hi All,

We are planning to upgrade/Migrate from Red Hat Enterprise linux 4 to Red Hat Enterprise linux 6.
Please anybody is having steps for this.
what are do and don'ts for this

Regards
Ravi

[Irithori]

That is a wide topic.
It depends on what services you are running and the detailed configuration of them.

In general, I would advise to install a new machine for every existing one, thus creating a second setup.
1) Install all the required daemons
2) migrate their config
3) document and automate every step from 1) and 2). Imho, this is not optional, but a requirement.
4) sync/migrate the data
5) test. This is also a requirement.
6) switch over production to the new machines