kdumpctl - Man Page

control interface for kdump

Synopsis

kdumpctl COMMAND

Description

kdumpctl is used to check or control the kdump service. In most cases, you should use systemctl to start / stop / enable kdump service instead. However, kdumpctl provides more details for debug and a helper to setup ssh key authentication.

Commands

start

Start the service.

stop

Stop the service.

status

Prints the current status of kdump service. It returns non-zero value if kdump is not operational.

restart

Is equal to start; stop

reload

reload crash kernel image and initramfs without triggering a rebuild.

rebuild

rebuild the crash kernel initramfs.

propagate

Helps to setup key authentication for ssh storage since it's impossible to use password authentication during kdump.

showmem

Prints the size of reserved memory for crash kernel in megabytes.

estimate

Estimate a suitable crashkernel value for current machine. This is a best-effort estimate. It will print a recommanded crashkernel value based on current kdump setup, and list some details of memory usage.

reset-crashkernel [KERNEL]

Reset crashkernel value to default value. kdumpctl will try to read from /usr/lib/modules/<KERNEL>/crashkernel.default and reset specified kernel's crashkernel cmdline value. If no kernel is specified, will reset current running kernel's crashkernel value. If /usr/lib/modules/<KERNEL>/crashkernel.default doesn't exist, will simply exit return 1.

See Also

kdump.conf(5), mkdumprd(8)

Referenced By

kdumpctl_selinux(8).

2015-07-13 kexec-tools