Solved

Downgrade CentOS from 6.8 to 6.5

Posted on 2016-09-21
10
78 Views
Last Modified: 2016-10-10
I recently upgraded my CentOS 6.5 system to 6.8 CentOS.  I need to downgrade to 6.5.  I have the 6.5 kernel and initrd files in boot.  Can I just boot to this kernel or do I need to downgrade packages too?
0
Comment
Question by:Walter Mackenzie
  • 3
  • 3
  • 2
  • +2
10 Comments
 
LVL 24

Expert Comment

by:Dr. Klahn
ID: 41808744
The simplest way would be to restore the entire system drive from the last full backup before the upgrade was done.

I take it there are no full backups?
0
 

Author Comment

by:Walter Mackenzie
ID: 41808961
No full backups.  The system is a test system so not critical.  I just did know if just running the older kernel was enough
0
 
LVL 77

Expert Comment

by:arnold
ID: 41809115
What is the cause that leads to the request?
Yes, you can change the boot to use an older kernel.
0
 

Author Comment

by:Walter Mackenzie
ID: 41809144
We are building/compiling software on 6.8 and cannot run of 6.5, so we want to have build system same as "run" system.  Do I need to downgrade packages after booting older kernel?
0
 
LVL 21

Expert Comment

by:Mazdajai
ID: 41809183
no need the downgrade the packages,  on the splash start up screen there should be a list of kernel you can choose from.
0
Ransomware-A Revenue Bonanza for Service Providers

Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat.  The purpose of this eBook is to educate the reader about ransomware attacks.

 
LVL 9

Accepted Solution

by:
Scott Silva earned 250 total points (awarded by participants)
ID: 41809206
In RedHat terms (and CentOS) minor version increases can be a mix of packages. But it is always supposed to be binary compatible... Think of it as being equivalent to the monthly updates in Windows...

At a set time period, they freeze these updates, and release a new minor version containing all these updates up to that set time...  6.5 and 6.6 are not different versions... They are just version 6 at different times in its lifecycle... Unless you are doing some very specific things in your package, it should run on any minor version of 6.

I have rarely had a package not run on every minor version of CentOS except for the rare perl upgrade  or those upgrades forced by security flaws that couldn't be backported...
0
 

Author Comment

by:Walter Mackenzie
ID: 41809227
Thanks Scott, so we are compiling our software with all the updated libraries/packages (glibc,alsa-lib..etc) on the 6.8 system.  So you are saying this is OK to take this compiled software (binaries) and run on 6.5 with no issues?  That's why I was worried about "updated" packages.
0
 
LVL 77

Assisted Solution

by:arnold
arnold earned 250 total points (awarded by participants)
ID: 41809279
As long as you are on 6.x your compiled should work ............centos/redhat maintains version major, minor of ...
The changes are on the micro/dub micro.
0
 
LVL 9

Expert Comment

by:Scott Silva
ID: 41809313
It is EXTREMELY rare that a package compiled on one minor version won't run on another minor version....  

The question is why aren't you applying patches to the older systems?

There have been many bad bugs and security issues repaired between 6.5 release and now...

Or at least applying the serious issue patches on a test system and testing first...


Running "yum-update" is all it takes to bring a system current, and is usually better than letting them run unpatched...
0
 
LVL 9

Expert Comment

by:Scott Silva
ID: 41836578
Close request received via email
0

Featured Post

U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
VMWare 6 crashing 14 98
Best way to virtualise a remote Linux server 2 52
gdb doesn't stop on breakpoint 2 50
Video Streaming 6 56
If you have a server on collocation with the super-fast CPU, that doesn't mean that you get it running at full power. Here is a preamble. When doing inventory of Linux servers, that I'm administering, I've found that some of them are running on l…
This document is written for Red Hat Enterprise Linux AS release 4 and ORACLE 10g.  Earlier releases can be installed using this document as well however there are some additional steps for packages to be installed see Metalink. Disclaimer: I hav…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now