e9e6a2c745
Add a rough esitimation support, currently, following memory usage are
checked by this sub command:
- System RAM
- Kdump Initramfs size
- Kdump Kernel image size
- Kdump Kernel module size
- Kdump userspace user and other runtime allocated memory (currently
simply using a fixed value: 64M)
- LUKS encryption memory usage
The output of kdumpctl estimate looks like this:
# kdumpctl estimate
Reserved crashkernel: 256M
Recommanded crashkernel: 160M
Kernel image size: 47M
Kernel modules size: 12M
Initramfs size: 19M
Runtime reservation: 64M
Large modules:
xfs: 1892352
nouveau: 2318336
And if the kdump target is encrypted:
# kdumpctl estimate
Encrypted kdump target requires extra memory, assuming using the keyslot with minimun memory requirement
Reserved crashkernel: 256M
Recommanded crashkernel: 655M
Kernel image size: 47M
Kernel modules size: 12M
Initramfs size: 19M
Runtime reservation: 64M
LUKS required size: 512M
Large modules:
xfs: 1892352
nouveau: 2318336
WARNING: Current crashkernel size is lower than recommanded size 655M.
The "Recommanded" value is calculated based on memory usages mentioned
above, and will be adjusted accodingly to be no less than the value provided
by kdump_get_arch_recommend_size.
Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Pingfan Liu <piliu@redhat.com>
56 lines
1.2 KiB
Groff
56 lines
1.2 KiB
Groff
.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.
|
|
|
|
.SH "SEE ALSO"
|
|
.BR kdump.conf (5),
|
|
.BR mkdumprd (8)
|