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Is it possible to upgrade from CentOS 5.6 to 6 ?

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"Short answer: 'Yes' with an 'If,' long answer: 'No' -- with a 'But.'" –  Tom O'Connor Jul 13 '11 at 9:35
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up vote 1 down vote accepted

Yes, it's theoretically possible to upgrade from 5.6 to 6.

No, I can't predict what'll happen if you try, but you might want to snapshot the state and try it in a virtual machine. I found some anecdotal forum posts by googling "upgrading centos 5.6 to 6.x" but none of them filled me with faith.

Minor versions are usually fine, but I'd preferentially do a clean install when changing major versions of anything.

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thank you for your information. –  RAGOpoR Jul 13 '11 at 10:39
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Since CentOS is based on RHEL you can trust their official statement too. In the official Installation Guide they write that an upgrade of a major version is not recommended. But they give you a guide how to do it and what you have to take care of.

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thank you for your information. –  RAGOpoR Jul 13 '11 at 10:39
    
Just as a datum, I have done this with a clean, freshly-installed C5.7 box, as a test, and it upgraded fine. How it would go on a box that's been in service for some years, and was indeed upgraded in-place from C4, I'll find out in about a month, when I do it. –  MadHatter Jan 7 '12 at 15:55
    
@MadHatter Thank you for the update. I was thinking about trying it out too. –  Raffael Luthiger Jan 7 '12 at 16:12
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