Upgrading from CentOS6 to CentOS7

NotionCommotion · 05-16-2016, 08:58 AM

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:

Make a list of all programs to reinstall.
Copy My Documents
Copy my Outlook crap
Etc.

So for *nix, I guess I would:

Make a copy of /home and /root
Copy /etc/?
Get a list of programs installed (how?)
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...

Habitual · 05-16-2016, 09:09 AM

On *nix,
I'd also dump crons and here's how to list installed packages.

Have fun!

eklavya · 05-16-2016, 09:09 AM

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

NotionCommotion · 05-16-2016, 09:31 AM

Quote:

Originally Posted by Habitual

... and here's how to list installed packages.

Have fun!

Will this also include files uploaded vi yum? What about programs I compiled?

NotionCommotion · 05-16-2016, 09:33 AM

Quote:

Originally Posted by eklavya

Here is a guide to upgrade CentOS 6 to CentOS 7.

Thanks! I will check it out, but not for a few days.

Habitual · 05-16-2016, 09:49 AM

Quote:

Originally Posted by NotionCommotion

Will this also include files uploaded vi yum? What about programs I compiled?

Yes, to yum is all I know.

JockVSJock · 05-16-2016, 10:36 AM

I've never successfully upgraded an Linux OS.

I would recommend to backup your data and rip and and replace.

NotionCommotion · 05-16-2016, 10:46 AM

Quote:

Originally Posted by JockVSJock

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.

JockVSJock · 05-16-2016, 11:42 AM

Quote:

Originally Posted by NotionCommotion

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.

Habitual · 05-16-2016, 11:47 AM

I've never had much luck upgrading major-to-major versions using CentOS.

Ztcoracat · 05-16-2016, 12:55 PM

Quote:

Originally Posted by Habitual

I've never had much luck upgrading major-to-major versions using CentOS.

Diito-
I always performed fresh install's:-