Red Hat linux have central database concept like windows AD
Yes and no. AD is pretty horrible (at least based on early AD implimentations, which are all that I have seen) so I can't see that anyone would want anything that is really like AD, unless you are supporting Windows machines.
If you are supporting Windows machines, you may want to look at Samba (can't think of a distro for which Samba is unavailable, but there will be one somewhere...). Samba, however, isn't a full AD 'clone', but it does support what you might consider a basic set of AD functionality and more recent versions are fuller than older versions. (And, it does more besides.)
So Samba probably does what you want (if what you want isn't too hard and you can learn how to do it), but almost everything has it.
If you are not supporting Windows machines there are probably tools that you can use to achieve specific objectives that are similar to stuff that AD does (but it might not be one monolithic tool that you use). To say any more on that, it would be useful to know your objectives.
Please also let me know that how many total partition should i make durning installing RH 9 .
Not too many, and not too few. The concepts 'too many' and 'too few' are rather dependant upon usage, so you'll need to say more about that.
Here's my list:
- I'd always want home on a separate partition.
- I usually place /boot on a separate partition, partly because I like that on a plain straightforward ext2 partition and I may use other things (i.e. a journalling filesystem) for the others.
You can make a case for things like
- /varon separate partitions, particularly if you intend to set up some partitions differently from others (I can't see me wanting atime on for /var for instance, so that is always likely to be set as noatime).
But many things will work and work reliably so I can't say that my way is the best as many others will work.
(Note; the less disk space you have, the fewer partitions you should use; if you are struggling to have enough disk space for your install, you only make the problem worse by havingto work out how to civvy up that space between many partitions). And if the machine had a specific purpose, like a database server or a file server that would change my view of specifically the high traffic partition.
If you want. This is an old rule of thumb and probably any success that it had was probably as much accidental as anything else. You'd might be better using the right amount, but you probably don't know what that is. Using too much won't be harmful (and it won't be advantageous, either). Using too little is rather more harmful, but many systems have so much RAM these days that you would rarely notice if they had zero swap. OTOH, hard disk space is cheap, too...
Is Fedora 9 is alternate of RH,what is your opinion about Fedora?
I've never really liked the RH stream (well, not this century, anyway) but your mileage will vary. The latest Fedora releases are certainly much improved over, say, Fedora 7 and I wouldn't want to put you off trying a Fedora of some kind just because I don't particularly like them.