"Generally, all Linux distributions needs a scheduled
reboot once to stay up to date with important kernel security
updates. RHN (or other distro vendors) provides Linux kernel
security updates. You can apply kernel updates using yum command or
apt-get command line options. After each upgrade you need to reboot
the server. Ksplice service allows you to skip reboot step and
apply hotfixes to kernel without rebooting the server. In this post
I will cover a quick installation of Ksplice for RHEL 5.x and try
to find out if service is worth every penny.
"The technology and hack behind this looks pretty cool. This is
useful if you've a small number of Linux based servers and/or you
want avoid unscheduled reboot just to apply hotfix to Linux kernel.
How Do I Install Ksplice?
"First, you need to register with Ksplice. Type the following
command to install rpm repo under RHEL 5: # rpm -ivh