How to on enable kernel crash dump on Debian Linux

To enable kernel crash dump on a Debian Linux system, you can follow these steps:

1. Edit the /etc/default/kdump-tools file and set the USE_KDUMP variable to 1. This will enable the kdump service.

USE_KDUMP=1

2. Edit the /etc/kdump.conf file and set the core_collector variable to makedumpfile. This will configure the kdump service to use the makedumpfile utility to create crash dumps.

core_collector makedumpfile

3. Set the crashkernel kernel parameter in the GRUB_CMDLINE_LINUX_DEFAULT variable in the /etc/default/grub file. This will reserve a portion of memory for the crash kernel, which will be used to create the crash dump.

GRUB_CMDLINE_LINUX_DEFAULT="crashkernel=128M"

Replace 128M with the amount of memory you want to reserve for the crash kernel.

4. Update the GRUB configuration by running the update-grub command.

update-grub

5. Start the kdump service by running the systemctl start kdump-tools.service command.

systemctl start kdump-tools.service

6. (Optional) Enable the kdump service to start automatically at boot time by running the systemctl enable kdump-tools.service command.

systemctl enable kdump-tools.service

That's it! You have now enabled kernel crash dump on your Debian Linux system.

Note: You may need to modify the steps depending on your specific setup and requirements. Additionally, make sure that you have enough free disk space to store the crash dumps.