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it seems that by doing yum update, lower release version such as CentOS 6.2 would be updated to CentOS 6.8 dy doing this link.

how does yum gurrantee that things would not go wrong in this process? especially consider kernel upgrade is usually deemed a dangerous operation.

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yum does not guarantee that you will or will not be having problems with your server after the upgrade. That is why an upgrade in a test server is necessary before upgrading a production server.

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  • How do you build a test server if you don't have one for the older machines? – Sajuuk Sep 11 '17 at 8:57

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