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. . This charm can be deployed alongside principle charms to enable Kernel Crash Dumps across deployed services.
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Kernel Crash Dumps are produced when a kernel panic. This charm enables the collection of such crash dumps on deployed units.
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.
$ juju deploy ubuntu $ juju deploy local:trusty/crashdump $ juju add-relation ubuntu crashdump
This charm is only valid for the Trusty serie as it relies on the kdump mechanism which is only available from Trusty onward.
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.
In order to test the charm on a local provider, you can use the following syntax:
$ juju deploy ubuntu --to=kvm:0 $ juju deploy local:trusty/crashdump $ juju add-relation ubuntu crashdump