Kernel Crash Dumps need to be enabled to capture the kernel vmcore
in case of kernel panic. This subordinate charm will correctly configure
the unit and force a reboot to enable the additional crashkernel= boot
parameter.
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This charm can be deployed alongside principle charms to enable
Kernel Crash Dumps across deployed services.

Overview

Kernel Crash Dumps are produced when a kernel panic. This charm enables
the collection of such crash dumps on deployed units.

Usage

Simply deploy the subordinate charm and add a relation with the service where
you want Kernel Crash Dumps collection enabled. It will do the proper
installation and configuration and reboot the service to add the required
kernel boot parameter.

This charm is only valid for the Trusty serie as it relies on the kdump
mechanism which is only available from Trusty onward.

Warning

As outlined, this require a reboot of the unit in order to complete the
configuration.

It is not possible to use this charm on LXC. It will try to installs
kexec-tools which will fail with the following error :

INFO install /usr/sbin/grub-probe: error: failed to get canonical path of
'/dev/mapper/ubuntu--vg-root'.

Use of grub on LXC is not possible.