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How do I verify that the system using correct GPG keys to verify all patches, packages and update installed from RHN or repo under RHEL 5 or 6 server operating systems?
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I'm trying to install RHEL 6 kernel updates and patches using the yum command and getting the following error:

Transaction Check Error:
  installing package kernel-2.6.32-131.2.1.el6.x86_64 needs 8MB on the /boot filesystem
Error Summary
Disk Requirements:
  At least 8MB more space needed on the /boot filesystem.

How do I fix this error and install RHEL kernel without increasing /boot size or reinstalling the operating system?
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HowTo: Install Ports in Freebsd

How do I install ports in FreeBSD operating systems using the command line options?
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How do I install Linux kernel source with Ubuntu patches? How can I install Ubuntu Linux kernel source code tree for version 2.6.3x using command line options?
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Q. I know how to update my system using yum command. But how can I find out that patch has been applied to a package? How do I search CVE patch number applied to a package under Red Hat / CentOS / RHEL / Fedora Linux?
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Q. How can I apply package updates from Red Hat Network (RHN) for my HP Red Hat Enterprise Linux Server?
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