On Friday 22 July 2011 07:12, Cia Watson wrote: > This tool is used to load a kernel in memory and reboot into > the kernel loaded in memory using the kexec system call. FIrst of all, kexec is not ksplice. kexec allows to reboot kernel without rebooting hardware, but it's still a reboot and a usual disruption of services associated with it. ksplice is a quite another thing. It allows to apply patches to an already running kernel with no disruption of services. Second, kexec is included in CentOS already: [tn at ibm2 cropgui]$ rpm -q kexec-tools kexec-tools-1.102pre-96.el5_5.4 Not sure whether default CentOS kernels support kexec system call. Best regards, Dmitry Mikhailov