10.2 Setting up Fast Reboots of the Current Kernel

The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

10.2 Setting up Fast Reboots of the Current Kernel

To set up your system so that you can enable fast reboots of the current kernel:

Create the file /etc/init.d/runkexec with the following contents:

#!/bin/sh
#
# runkexec
#
### BEGIN INIT INFO
# Provides: runkexec
# Required-Start:
# Required-Stop:
# Default-Stop:
# Description: Enable or disable fast system rebooting
# Short-Description: enable or disable fast system rebooting
### END INIT INFO

KV=`uname -r`

case "$1" in
  start|restart|load|reload)
        kexec -l --append="`cat /proc/cmdline`" --initrd=/boot/initramfs-${KV}.img \
            /boot/vmlinuz-${KV}
        ;;
  stop|unload)
        kexec -u && echo "Target kexec kernel unloaded."
        ;;
  status)
        echo "Status not available for kexec."
        ;;
  *)
        echo "Usage: runkexec {start|restart|load|reload|stop|unload|status}"
        exit 2
esac
exit 0

Set the ownership and mode of the file.

# chown root:root /etc/init.d/runkexec
# chmod 755 /etc/init.d/runkexec

Create the symbolic link S00kexec to the file from the /etc/rc1.d directory.
```
# ln -s /etc/init.d/runkexec /etc/rc1.d/S00kexec
```
To enable fast reboots without needing to reboot the system, enter:
```
# service runkexec start
```