rewrite reset_crashkernel to support fadump and to used by RPM scriptlet
Rewrite kdumpctl reset-crashkernel KERNEL_PATH as
kdumpctl reset-crashkernel [--fadump=[on|off|nocma]] [--kernel=path_to_kernel] [--reboot]
This interface would reset a specific kernel to the default crashkernel value
given the kernel path. And it also supports grubby's syntax so there are the
following special cases,
- if --kernel not specified,
- use KDUMP_KERNELVER if it's defined in /etc/sysconfig/kdump
- otherwise use current running kernel, i.e. `uname -r`
- if --kernel=DEFAULT, the default boot kernel is chosen
- if --kernel=ALL, all kernels would have its crashkernel reset to the
default value and the /etc/default/grub is updated as well
--fadump=[on|off|nocma] toggles fadump on/off for the kernel provided
in KERNEL_PATH. If --fadump is omitted, the dump mode is determined by
parsing the kernel command line for the kernel(s) to update.
CoreOS/Atomic/Silverblue needs to be treated as a special case because,
- "rpm-ostree kargs" is used to manage kernel command line parameters
so --kernel doesn't make sense and there is no need to find current
running kernel
- "rpm-ostree kargs" itself would prompt the user to reboot the system
after modify the kernel command line parameter
- POWER is not supported so we can assume the dump mode is always kdump
This interface will also be called by kexec-tools RPM scriptlets [1]
to reset crashkernel.
Note the support of crashkenrel.default is dropped.
[1] https://docs.fedoraproject.org/en-US/packaging-guidelines/Scriptlets/
Reviewed-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Coiby Xu <coxu@redhat.com>
This commit is contained in:
Coiby Xu
parent
12ecbce359
commit
140da74a34
203
kdumpctl
203
kdumpctl
@ -1355,38 +1355,194 @@ _get_current_running_kernel_path()
|
||||
fi
|
||||
}
|
||||
|
||||
reset_crashkernel()
|
||||
_update_grub()
|
||||
{
|
||||
local kernel=$1 entry crashkernel_default
|
||||
local grub_etc_default="/etc/default/grub"
|
||||
|
||||
[[ -z $kernel ]] && kernel=$(uname -r)
|
||||
crashkernel_default=$(cat "/usr/lib/modules/$kernel/crashkernel.default" 2> /dev/null)
|
||||
|
||||
if [[ -z $crashkernel_default ]]; then
|
||||
derror "$kernel doesn't have a crashkernel.default"
|
||||
exit 1
|
||||
fi
|
||||
local _kernel_path=$1 _crashkernel=$2 _dump_mode=$3 _fadump_val=$4
|
||||
|
||||
if is_atomic; then
|
||||
if rpm-ostree kargs | grep -q "crashkernel="; then
|
||||
rpm-ostree kargs --replace="crashkernel=$crashkernel_default"
|
||||
rpm-ostree kargs --replace="crashkernel=$_crashkernel"
|
||||
else
|
||||
rpm-ostree kargs --append="crashkernel=$crashkernel_default"
|
||||
rpm-ostree kargs --append="crashkernel=$_crashkernel"
|
||||
fi
|
||||
else
|
||||
entry=$(grubby --info ALL | grep "^kernel=.*$kernel")
|
||||
entry=${entry#kernel=}
|
||||
entry=${entry#\"}
|
||||
entry=${entry%\"}
|
||||
[[ -f /etc/zipl.conf ]] && zipl_arg="--zipl"
|
||||
grubby --args "crashkernel=$_crashkernel" --update-kernel "$_kernel_path" $zipl_arg
|
||||
if [[ $_dump_mode == kdump ]]; then
|
||||
grubby --remove-args="fadump" --update-kernel "$_kernel_path"
|
||||
else
|
||||
grubby --args="fadump=$_fadump_val" --update-kernel "$_kernel_path"
|
||||
fi
|
||||
fi
|
||||
[[ $zipl_arg ]] && zipl > /dev/null
|
||||
}
|
||||
|
||||
if [[ -f $grub_etc_default ]]; then
|
||||
sed -i -e "s/^\(GRUB_CMDLINE_LINUX=.*\)crashkernel=[^\ \"]*\([\ \"].*\)$/\1$crashkernel_default\2/" "$grub_etc_default"
|
||||
_valid_grubby_kernel_path()
|
||||
{
|
||||
[[ -n "$1" ]] && grubby --info="$1" > /dev/null 2>&1
|
||||
}
|
||||
|
||||
_get_all_kernels_from_grubby()
|
||||
{
|
||||
local _kernels _line _kernel_path _grubby_kernel_path=$1
|
||||
|
||||
for _line in $(grubby --info "$_grubby_kernel_path" | grep "^kernel="); do
|
||||
_kernel_path=$(_filter_grubby_kernel_str "$_line")
|
||||
_kernels="$_kernels $_kernel_path"
|
||||
done
|
||||
echo -n "$_kernels"
|
||||
}
|
||||
|
||||
GRUB_ETC_DEFAULT="/etc/default/grub"
|
||||
# modify the kernel command line parameter in default grub conf
|
||||
#
|
||||
# $1: the name of the kernel command line parameter
|
||||
# $2: new value. If empty, the parameter would be removed
|
||||
_update_kernel_cmdline_in_grub_etc_default()
|
||||
{
|
||||
local _para=$1 _val=$2 _para_val _regex
|
||||
|
||||
if [[ -n $_val ]]; then
|
||||
_para_val="$_para=$_val"
|
||||
fi
|
||||
|
||||
_regex='^(GRUB_CMDLINE_LINUX=.*)([[:space:]"])'"$_para"'=[^[:space:]"]*(.*)$'
|
||||
if grep -q -E "$_regex" "$GRUB_ETC_DEFAULT"; then
|
||||
sed -i -E 's/'"$_regex"'/\1\2'"$_para_val"'\3/' "$GRUB_ETC_DEFAULT"
|
||||
elif [[ -n $_para_val ]]; then
|
||||
# If the kernel parameter doesn't exist, put it in the first
|
||||
sed -i -E 's/^(GRUB_CMDLINE_LINUX=")/\1'"$_para_val"' /' "$GRUB_ETC_DEFAULT"
|
||||
fi
|
||||
}
|
||||
|
||||
reset_crashkernel()
|
||||
{
|
||||
local _opt _val _dump_mode _fadump_val _reboot _grubby_kernel_path _kernel _kernels
|
||||
local _old_crashkernel _new_crashkernel _new_dump_mode _crashkernel_changed
|
||||
local _new_fadump_val _old_fadump_val _what_is_updated
|
||||
|
||||
for _opt in "$@"; do
|
||||
case "$_opt" in
|
||||
--fadump=*)
|
||||
_val=${_opt#*=}
|
||||
if _dump_mode=$(get_dump_mode_by_fadump_val $_val); then
|
||||
_fadump_val=$_val
|
||||
else
|
||||
derror "failed to determine dump mode"
|
||||
exit
|
||||
fi
|
||||
;;
|
||||
--kernel=*)
|
||||
_val=${_opt#*=}
|
||||
if ! _valid_grubby_kernel_path $_val; then
|
||||
derror "Invalid $_opt, please specify a valid kernel path, ALL or DEFAULT"
|
||||
exit
|
||||
fi
|
||||
_grubby_kernel_path=$_val
|
||||
;;
|
||||
--reboot)
|
||||
_reboot=yes
|
||||
;;
|
||||
*)
|
||||
derror "$_opt not recognized"
|
||||
exit 1
|
||||
;;
|
||||
esac
|
||||
done
|
||||
|
||||
# 1. CoreOS uses "rpm-ostree kargs" instead of grubby to manage kernel command
|
||||
# line. --kernel=ALL doesn't make sense for CoreOS.
|
||||
# 2. CoreOS doesn't support POWER so the dump mode is always kdump.
|
||||
# 3. "rpm-ostree kargs" would prompt the user to reboot the system after
|
||||
# modifying the kernel command line so there is no need for kexec-tools
|
||||
# to repeat it.
|
||||
if is_atomic; then
|
||||
_old_crashkernel=$(rpm-ostree kargs | sed -n -E 's/.*(^|\s)crashkernel=(\S*).*/\2/p')
|
||||
_new_dump_mode=kdump
|
||||
_new_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_new_dump_mode")
|
||||
if [[ $_old_crashkernel != "$_new_crashkernel" ]]; then
|
||||
_update_grub "" "$_new_crashkernel" "$_new_dump_mode" ""
|
||||
if [[ $_reboot == yes ]]; then
|
||||
systemctl reboot
|
||||
fi
|
||||
fi
|
||||
return
|
||||
fi
|
||||
|
||||
# For non-ppc64le systems, the dump mode is always kdump since only ppc64le
|
||||
# has FADump.
|
||||
if [[ -z $_dump_mode && $(uname -m) != ppc64le ]]; then
|
||||
_dump_mode=kdump
|
||||
_fadump_val=off
|
||||
fi
|
||||
|
||||
# If the dump mode is determined, we can also know the default crashkernel value
|
||||
if [[ -n $_dump_mode ]]; then
|
||||
_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_dump_mode")
|
||||
fi
|
||||
|
||||
# If --kernel-path=ALL, update GRUB_CMDLINE_LINUX in /etc/default/grub.
|
||||
#
|
||||
# An exception case is when the ppc64le user doesn't specify the fadump value.
|
||||
# In this case, the dump mode would be determined by parsing the kernel
|
||||
# command line of the kernel(s) to be updated thus don't update GRUB_CMDLINE_LINUX.
|
||||
#
|
||||
# The following code has been simplified because of what has been done early,
|
||||
# - set the dump mode as kdump for non-ppc64le cases
|
||||
# - retrieved the default crashkernel value for given dump mode
|
||||
if [[ $_grubby_kernel_path == ALL && -n $_dump_mode ]]; then
|
||||
_update_kernel_cmdline_in_grub_etc_default crashkernel "$_crashkernel"
|
||||
# remove the fadump if fadump is disabled
|
||||
[[ $_fadump_val == off ]] && _fadump_val=""
|
||||
_update_kernel_cmdline_in_grub_etc_default fadump "$_fadump_val"
|
||||
fi
|
||||
|
||||
# If kernel-path not specified, either
|
||||
# - use KDUMP_KERNELVER if it's defined
|
||||
# - use current running kernel
|
||||
if [[ -z $_grubby_kernel_path ]]; then
|
||||
if [[ -z $KDUMP_KERNELVER ]] ||
|
||||
! _kernel_path=$(_find_kernel_path_by_release "$KDUMP_KERNELVER"); then
|
||||
if ! _kernel_path=$(_get_current_running_kernel_path); then
|
||||
derror "no running kernel found"
|
||||
exit 1
|
||||
fi
|
||||
fi
|
||||
_kernels=$_kernel_path
|
||||
else
|
||||
_kernels=$(_get_all_kernels_from_grubby "$_grubby_kernel_path")
|
||||
fi
|
||||
|
||||
for _kernel in $_kernels; do
|
||||
if [[ -z $_dump_mode ]]; then
|
||||
_new_dump_mode=$(get_dump_mode_by_kernel "$_kernel")
|
||||
_new_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_new_dump_mode")
|
||||
_new_fadump_val=$(get_grub_kernel_boot_parameter "$_kernel" fadump)
|
||||
else
|
||||
_new_dump_mode=$_dump_mode
|
||||
_new_crashkernel=$_crashkernel
|
||||
_new_fadump_val=$_fadump_val
|
||||
fi
|
||||
|
||||
[[ -f /etc/zipl.conf ]] && zipl_arg="--zipl"
|
||||
grubby --args "$crashkernel_default" --update-kernel "$entry" $zipl_arg
|
||||
[[ $zipl_arg ]] && zipl > /dev/null
|
||||
_old_crashkernel=$(get_grub_kernel_boot_parameter "$_kernel" crashkernel)
|
||||
_old_fadump_val=$(get_grub_kernel_boot_parameter "$_kernel" fadump)
|
||||
if [[ $_old_crashkernel != "$_new_crashkernel" || $_old_fadump_val != "$_new_fadump_val" ]]; then
|
||||
_update_grub "$_kernel" "$_new_crashkernel" "$_new_dump_mode" "$_new_fadump_val"
|
||||
if [[ $_reboot != yes ]]; then
|
||||
if [[ $_old_crashkernel != "$_new_crashkernel" ]]; then
|
||||
_what_is_updated="Updated crashkernel=$_new_crashkernel"
|
||||
else
|
||||
# This case happens only when switching between fadump=on and fadump=nocma
|
||||
_what_is_updated="Updated fadump=$_new_fadump_val"
|
||||
fi
|
||||
dwarn "$_what_is_updated for kernel=$_kernel. Please reboot the system for the change to take effect."
|
||||
fi
|
||||
_crashkernel_changed=yes
|
||||
fi
|
||||
done
|
||||
|
||||
if [[ $_reboot == yes && $_crashkernel_changed == yes ]]; then
|
||||
reboot
|
||||
fi
|
||||
}
|
||||
|
||||
@ -1447,7 +1603,8 @@ main()
|
||||
get_default_crashkernel "$2"
|
||||
;;
|
||||
reset-crashkernel)
|
||||
reset_crashkernel "$2"
|
||||
shift
|
||||
reset_crashkernel "$@"
|
||||
;;
|
||||
*)
|
||||
dinfo $"Usage: $0 {estimate|start|stop|status|restart|reload|rebuild|reset-crashkernel|propagate|showmem}"
|
||||
|
||||
19
kdumpctl.8
19
kdumpctl.8
@ -50,14 +50,19 @@ 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.
|
||||
.I reset-crashkernel [--kernel=path_to_kernel] [--reboot]
|
||||
Reset crashkernel to default value recommended by kexec-tools. If no kernel
|
||||
is specified, will reset KDUMP_KERNELVER if it's defined in /etc/sysconfig/kdump
|
||||
or current running kernel's crashkernel value if KDUMP_KERNELVER is empty. You can
|
||||
also specify --kernel=ALL and --kernel=DEFAULT which have the same meaning as
|
||||
grubby's kernel-path=ALL and kernel-path=DEFAULT. ppc64le supports FADump and
|
||||
supports an additonal [--fadump=[on|off|nocma]] parameter to toggle FADump
|
||||
on/off.
|
||||
|
||||
Note: The memory requirements for kdump varies heavily depending on the
|
||||
used hardware and system configuration. Thus the recommended
|
||||
crashkernel might not work for your specific setup. Please test if
|
||||
kdump works after resetting the crashkernel value.
|
||||
|
||||
.SH "SEE ALSO"
|
||||
.BR kdump.conf (5),
|
||||
|
||||
Loading…
Reference in New Issue
Block a user