# yum install kexec-tools
# yum install system-config-kdump
# kexec -l /boot/vmlinuz-<kernel version> --initrd=/boot/initrd-<kernel version>.img --command-line="`cat /proc/cmdline`"
# chkconfig --list kdump kdump 0:off 1:off 2:on 3:on 4:on 5:on 6:off