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Old 07-17-2007, 08:20 PM   #1
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Server Migration - New Install

Hi All,

Here is my scenario. My server is out of warranty, much like my OS (RH 9). So, I'm going to migrate to a VM running on a newer server. My question is... Should I do a fresh install of CentOS in a VM, or upgrade RH 9 to CentOS then image it into a VM?

If I do a fresh install, how hard will it be to migrate over user accounts and settings, as well as mail? Could I get someone to help me with somewhat detailed instructions?

Thanks in advance!

Old 07-19-2007, 02:57 PM   #2
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The distance between RH9 and RHEL/CentOS 5 is huge, so you need to do a fresh install. Generally, upgrades from one version to the next are easy, but this is a big leap. You won't be able to just copy configuration files from /etc/, so will need to spend a bit of time configuring the new system to perform the same functions as the old one.

Users *are* relatively easy. You can transfer account settings, but this requires a sound understanding of *NIX to get right, so it may be better to recreate the accounts if you aren't particularly experienced.

Once you have matching accounts you can simply copy the contents of a user home directory between the servers, use chown and chgrp to reset the owner and group, and chmod to reset the permissions - a small shell script will save a lot of time.

If you haven't done shell scripting, this is a great way to start. and an hour of your time will give you all you need.

If you are using mbox files then mail is the same principle - copy all of the files from /var/spool/mail/, and then reset the permissions on the files so that the owner is the relevant user account, and the group is the mail server account.


migration, upgrade

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