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Old 05-16-2016, 08:58 AM   #1
NotionCommotion
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Upgrading from CentOS6 to CentOS7


Is there a way to do so without starting over?

There is a tool located at https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool, but it includes the following note:

DO NOT USE this tool. Warning: use of this tool is currently BROKEN as several system-critical packages are of a higher version number in CentOS 6.7 than they are in CentOS 7 so those do not get upgraded correctly. This renders yum and several other system tools non-functional.

If I should just do a clean install, any recommended steps? Not asking how to install CentOS7, but just a general plan. I've never done this, but on Windows machines I always:
  1. Make a list of all programs to reinstall.
  2. Copy My Documents
  3. Copy my Outlook crap
  4. Etc.

So for *nix, I guess I would:
  1. Make a copy of /home and /root
  2. Copy /etc/?
  3. Get a list of programs installed (how?)
  4. What else?

Also, maybe making some sort of backup before doing so makes sense.

Hopefully, there is a good way to upgrade from CentOS6 to CentOS7, but if not...
 
Old 05-16-2016, 09:09 AM   #2
Habitual
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On *nix,
I'd also dump crons and here's how to list installed packages.

Have fun!

Last edited by Habitual; 05-16-2016 at 09:10 AM.
 
Old 05-16-2016, 09:09 AM   #3
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Here is a guide to upgrade CentOS 6 to CentOS 7.

https://www.vultr.com/docs/how-to-up...-6-to-centos-7

But no upgrade is smooth. I would suggest you to take backup before doing anything.

I have upgraded my centOS too but I upgraded using bootable pendrive and install it from the scratch.
There is a daily back cron on my Centos which takes back up in Network hard Drive. So it was not difficult at all
 
Old 05-16-2016, 09:31 AM   #4
NotionCommotion
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Quote:
Originally Posted by Habitual View Post
... and here's how to list installed packages.

Have fun!
Will this also include files uploaded vi yum? What about programs I compiled?
 
Old 05-16-2016, 09:33 AM   #5
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Originally Posted by eklavya View Post
Here is a guide to upgrade CentOS 6 to CentOS 7.
Thanks! I will check it out, but not for a few days.
 
Old 05-16-2016, 09:49 AM   #6
Habitual
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Quote:
Originally Posted by NotionCommotion View Post
Will this also include files uploaded vi yum? What about programs I compiled?
Yes, to yum is all I know.
 
Old 05-16-2016, 10:36 AM   #7
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I've never successfully upgraded an Linux OS.

I would recommend to backup your data and rip and and replace.
 
Old 05-16-2016, 10:46 AM   #8
NotionCommotion
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I've never successfully upgraded an Linux OS.

I would recommend to backup your data and rip and and replace.
That is probably what I will end up doing. If nothing else, a good excuse to clean everything up.
 
Old 05-16-2016, 11:42 AM   #9
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Quote:
Originally Posted by NotionCommotion View Post
That is probably what I will end up doing. If nothing else, a good excuse to clean everything up.
Let me add it has been sometime since I've tried to do upgrades with the Linux OS. 100% of the time, it didn't not work (Knoppix and Red Hat), so I did a rip and replace. That was about 10 years ago.

I'm sure things change and maybe it isn't as error-prone as it was in the past, however that has been my experience.

If you have the free time, then go for it.
 
Old 05-16-2016, 11:47 AM   #10
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I've never had much luck upgrading major-to-major versions using CentOS.
 
Old 05-16-2016, 12:55 PM   #11
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Quote:
Originally Posted by Habitual View Post
I've never had much luck upgrading major-to-major versions using CentOS.
Diito-
I always performed fresh install's:-
 
  


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