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Well previously whenever there was an update the CentOS used to get updated to the latest version with the kernel update.
Now the latest version of centOs has reached 6.4 but my server is getting updated to the latest version...it's still in version 5.7... Though the kernel gets updated, the version remains the same with 5.7.
Is it that centOs has stopped updating the version from 5.7?Can anyone tell me how can i make it to latest version?
5.x to 6.x is a full upgrade, 5.x to 5.y is just incremental patches. Really, the minor release number doesn't mean anything, it's just a baseline of package versions at a point in time. If you want to actually go to 6 then that is a significantly larger step, that you need to understand the consequences of. I would never recommend inline upgrading of a real server. You should do the right thing and rebuild the box really. It is possible though, plenty of guides for it on centos.org and other sites.
absolutely not. 5.8 will nominally come along at some point, but all the while you're running "yum update" against legitimate repositories, you'll be as up to date as possible. el5 will continue having security and bug fixes for a pretty long time still.
el5 runs a 2.6.18 kernel, el6 runs 2.6.32. These kernel versions were released 3 years apart, so in many areas, el5 is three years more secure than el6. Obviously not that simple at all, but you hopefully see what I mean.
I'll just stress again that the minor version really means very little. The updates will keep coming out regardless of the number. It's just a line in the sand they can draw to allow things like remastering of iso images etc.