How do you upgrade the kernel in Redhat Linux 6.0?
And how can I confirm whether it is updated or not?
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I think what you are looking for is available here: http://www.linuxfunda.com/2013/11/08/how-to-upgrade-the-kernel-on-centos/
While the instructions are for CentOS it should work for Red Hat as well.
Updating the kernel is just like updating anything else, e.g.
yum update should do it (or whatever GUIish front end you prefer). The output should tell you if it got updated or not and
rpm -q kernel shows you the installed kernels (by default, there should be 3 around for fallback). If it looks OK so far, reboot (the new kernel takes over on reboot). Afterwards,
uname -r tells you the release of the running kernel.