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Old 02-27-2016, 09:20 AM   #1
packets
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migrate old server to new hardware


I have an old IBM server running CentOS 6 and I will need to migrate to a new server. The model will not be the same but the specification will be the same. It will be same hard disk, same number of nic cards, etc.

My question is what is the best way to migrate my server? As mush as possible I don't want to reinstall the OS and start from scratch. I am thinking of using Clonezilla. My concern is how to do it. I know Clonezilla is used to clone disk but I haven't use it before.

Any recommendation on how I can properly migrate my old server? TIA.
 
Old 02-27-2016, 09:46 AM   #2
Emerson
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Are you running a rolling distro? If not, I'd say go for fresh install with latest version of your favorite distro. Use the old box configuration as reference.
 
Old 02-27-2016, 09:57 AM   #3
packets
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Distro is CentOs 6 and CentOS 7 is out already. I am already thinking to do fresh install and just migrate data. Is just that the risk is high and a bit tedious :-)
 
Old 02-27-2016, 10:55 AM   #4
Chris E
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Unless you really want to there is no need to do a fresh install. I've swapped drives between servers many times with completely different chipsets etc and rarely had issues. CentOS 6 is also more forgiving than earlier releases on detecting hardware.

Two things you will need to do are:

1. Delete or move /etc/udev/rules.d/70-persistant-net.rules - Udev will recreate this file on boot, otherwise your NIC's may not be detected.

2. Update the mac address/HWADDR in /etc/sysconfig/ifcfg-* to match the new NIC's

If you are going to use new drives I would just use dd if they are the same size, or partition manually + rsync the files over.
 
Old 02-27-2016, 11:04 AM   #5
TB0ne
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Quote:
Originally Posted by packets View Post
Distro is CentOs 6 and CentOS 7 is out already. I am already thinking to do fresh install and just migrate data.
That is the best way to go, in my opinion, ALWAYS. I've had too many issues with old bits of things hanging around after an in-place upgrade, that have caused issues later. A wipe/reload (in my opinion), usually yields better results.
Quote:
Is just that the risk is high and a bit tedious :-)
...and welcome to your job as a systems administrator. This is where your knowledge and training come in to play.

If you're getting a new server, get new hard drives too. Do your install/migration there, and test things...leave your old server in place as a fall-back in case there are issues. When you're done, and have verified that everything is working on the new box, format/reload the old server, and tuck that hard drive away.
 
Old 02-28-2016, 06:01 AM   #6
packets
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Thanks all for the inputs. I opted to do the fresh install :-)
 
  


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