2020-10-15 12:45:57 +00:00
|
|
|
.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.
|
2021-04-21 19:27:10 +00:00
|
|
|
.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.
|
2021-06-10 05:06:22 +00:00
|
|
|
.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.
|
|
|
|
|
|
2020-10-15 12:45:57 +00:00
|
|
|
|
|
|
|
|
.SH "SEE ALSO"
|
|
|
|
|
.BR kdump.conf (5),
|
|
|
|
|
.BR mkdumprd (8)
|
