.TH KDUMPCTL 8 2015-07-13 kexec-tools

.SH NAME
kdumpctl \- control interface for kdump

.SH SYNOPSIS
.B kdumpctl
.I COMMAND

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

.SH COMMANDS
.TP
.I start
Start the service.
.TP
.I stop
Stop the service.
.TP
.I status
Prints the current status of kdump service.
It returns non-zero value if kdump is not operational.
.TP
.I restart
Is equal to
.I start; stop
.TP
.I reload
reload crash kernel image and initramfs without triggering a rebuild.
.TP
.I rebuild
rebuild the crash kernel initramfs.
.TP
.I propagate
Helps to setup key authentication for ssh storage since it's
impossible to use password authentication during kdump.
.TP
.I showmem
Prints the size of reserved memory for crash kernel in megabytes.
.TP
.I 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.
.TP
.I 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.


.SH "SEE ALSO"
.BR kdump.conf (5),
.BR mkdumprd (8)