rewrite reset_crashkernel to support fadump and to used by RPM scriptlet
Resolves: bz1895258
Upstream: Fedora
Conflict: None
commit 140da74a34
Author: Coiby Xu <coxu@redhat.com>
Date: Wed Dec 1 13:39:40 2021 +0800
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>
Signed-off-by: Coiby Xu <coxu@redhat.com>
This commit is contained in:
Coiby Xu
Tao Liu
parent
16777a88b8
commit
3f828198af
203
kdumpctl
203
kdumpctl
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@ -1381,38 +1381,194 @@ _get_current_running_kernel_path()
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fi
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}
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reset_crashkernel()
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_update_grub()
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{
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local kernel=$1 entry crashkernel_default
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local grub_etc_default="/etc/default/grub"
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[[ -z $kernel ]] && kernel=$(uname -r)
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crashkernel_default=$(cat "/usr/lib/modules/$kernel/crashkernel.default" 2> /dev/null)
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if [[ -z $crashkernel_default ]]; then
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derror "$kernel doesn't have a crashkernel.default"
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exit 1
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fi
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local _kernel_path=$1 _crashkernel=$2 _dump_mode=$3 _fadump_val=$4
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if is_atomic; then
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if rpm-ostree kargs | grep -q "crashkernel="; then
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rpm-ostree kargs --replace="crashkernel=$crashkernel_default"
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rpm-ostree kargs --replace="crashkernel=$_crashkernel"
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else
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rpm-ostree kargs --append="crashkernel=$crashkernel_default"
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rpm-ostree kargs --append="crashkernel=$_crashkernel"
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fi
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else
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entry=$(grubby --info ALL | grep "^kernel=.*$kernel")
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entry=${entry#kernel=}
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entry=${entry#\"}
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entry=${entry%\"}
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[[ -f /etc/zipl.conf ]] && zipl_arg="--zipl"
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grubby --args "crashkernel=$_crashkernel" --update-kernel "$_kernel_path" $zipl_arg
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if [[ $_dump_mode == kdump ]]; then
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grubby --remove-args="fadump" --update-kernel "$_kernel_path"
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else
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grubby --args="fadump=$_fadump_val" --update-kernel "$_kernel_path"
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fi
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fi
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[[ $zipl_arg ]] && zipl > /dev/null
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}
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if [[ -f $grub_etc_default ]]; then
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sed -i -e "s/^\(GRUB_CMDLINE_LINUX=.*\)crashkernel=[^\ \"]*\([\ \"].*\)$/\1$crashkernel_default\2/" "$grub_etc_default"
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_valid_grubby_kernel_path()
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{
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[[ -n "$1" ]] && grubby --info="$1" > /dev/null 2>&1
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}
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_get_all_kernels_from_grubby()
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{
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local _kernels _line _kernel_path _grubby_kernel_path=$1
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for _line in $(grubby --info "$_grubby_kernel_path" | grep "^kernel="); do
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_kernel_path=$(_filter_grubby_kernel_str "$_line")
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_kernels="$_kernels $_kernel_path"
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done
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echo -n "$_kernels"
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}
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GRUB_ETC_DEFAULT="/etc/default/grub"
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# modify the kernel command line parameter in default grub conf
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#
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# $1: the name of the kernel command line parameter
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# $2: new value. If empty, the parameter would be removed
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_update_kernel_cmdline_in_grub_etc_default()
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{
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local _para=$1 _val=$2 _para_val _regex
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if [[ -n $_val ]]; then
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_para_val="$_para=$_val"
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fi
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_regex='^(GRUB_CMDLINE_LINUX=.*)([[:space:]"])'"$_para"'=[^[:space:]"]*(.*)$'
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if grep -q -E "$_regex" "$GRUB_ETC_DEFAULT"; then
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sed -i -E 's/'"$_regex"'/\1\2'"$_para_val"'\3/' "$GRUB_ETC_DEFAULT"
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elif [[ -n $_para_val ]]; then
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# If the kernel parameter doesn't exist, put it in the first
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sed -i -E 's/^(GRUB_CMDLINE_LINUX=")/\1'"$_para_val"' /' "$GRUB_ETC_DEFAULT"
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fi
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}
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reset_crashkernel()
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{
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local _opt _val _dump_mode _fadump_val _reboot _grubby_kernel_path _kernel _kernels
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local _old_crashkernel _new_crashkernel _new_dump_mode _crashkernel_changed
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local _new_fadump_val _old_fadump_val _what_is_updated
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for _opt in "$@"; do
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case "$_opt" in
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--fadump=*)
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_val=${_opt#*=}
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if _dump_mode=$(get_dump_mode_by_fadump_val $_val); then
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_fadump_val=$_val
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else
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derror "failed to determine dump mode"
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exit
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fi
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;;
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--kernel=*)
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_val=${_opt#*=}
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if ! _valid_grubby_kernel_path $_val; then
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derror "Invalid $_opt, please specify a valid kernel path, ALL or DEFAULT"
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exit
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fi
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_grubby_kernel_path=$_val
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;;
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--reboot)
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_reboot=yes
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;;
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*)
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derror "$_opt not recognized"
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exit 1
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;;
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esac
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done
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# 1. CoreOS uses "rpm-ostree kargs" instead of grubby to manage kernel command
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# line. --kernel=ALL doesn't make sense for CoreOS.
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# 2. CoreOS doesn't support POWER so the dump mode is always kdump.
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# 3. "rpm-ostree kargs" would prompt the user to reboot the system after
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# modifying the kernel command line so there is no need for kexec-tools
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# to repeat it.
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if is_atomic; then
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_old_crashkernel=$(rpm-ostree kargs | sed -n -E 's/.*(^|\s)crashkernel=(\S*).*/\2/p')
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_new_dump_mode=kdump
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_new_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_new_dump_mode")
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if [[ $_old_crashkernel != "$_new_crashkernel" ]]; then
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_update_grub "" "$_new_crashkernel" "$_new_dump_mode" ""
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if [[ $_reboot == yes ]]; then
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systemctl reboot
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fi
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fi
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return
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fi
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# For non-ppc64le systems, the dump mode is always kdump since only ppc64le
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# has FADump.
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if [[ -z $_dump_mode && $(uname -m) != ppc64le ]]; then
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_dump_mode=kdump
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_fadump_val=off
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fi
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# If the dump mode is determined, we can also know the default crashkernel value
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if [[ -n $_dump_mode ]]; then
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_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_dump_mode")
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fi
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# If --kernel-path=ALL, update GRUB_CMDLINE_LINUX in /etc/default/grub.
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#
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# An exception case is when the ppc64le user doesn't specify the fadump value.
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# In this case, the dump mode would be determined by parsing the kernel
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# command line of the kernel(s) to be updated thus don't update GRUB_CMDLINE_LINUX.
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#
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# The following code has been simplified because of what has been done early,
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# - set the dump mode as kdump for non-ppc64le cases
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# - retrieved the default crashkernel value for given dump mode
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if [[ $_grubby_kernel_path == ALL && -n $_dump_mode ]]; then
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_update_kernel_cmdline_in_grub_etc_default crashkernel "$_crashkernel"
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# remove the fadump if fadump is disabled
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[[ $_fadump_val == off ]] && _fadump_val=""
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_update_kernel_cmdline_in_grub_etc_default fadump "$_fadump_val"
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fi
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# If kernel-path not specified, either
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# - use KDUMP_KERNELVER if it's defined
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# - use current running kernel
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if [[ -z $_grubby_kernel_path ]]; then
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if [[ -z $KDUMP_KERNELVER ]] ||
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! _kernel_path=$(_find_kernel_path_by_release "$KDUMP_KERNELVER"); then
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if ! _kernel_path=$(_get_current_running_kernel_path); then
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derror "no running kernel found"
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exit 1
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fi
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fi
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_kernels=$_kernel_path
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else
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_kernels=$(_get_all_kernels_from_grubby "$_grubby_kernel_path")
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fi
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for _kernel in $_kernels; do
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if [[ -z $_dump_mode ]]; then
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_new_dump_mode=$(get_dump_mode_by_kernel "$_kernel")
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_new_crashkernel=$(kdump_get_arch_recommend_crashkernel "$_new_dump_mode")
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_new_fadump_val=$(get_grub_kernel_boot_parameter "$_kernel" fadump)
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else
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_new_dump_mode=$_dump_mode
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_new_crashkernel=$_crashkernel
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_new_fadump_val=$_fadump_val
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fi
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[[ -f /etc/zipl.conf ]] && zipl_arg="--zipl"
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grubby --args "$crashkernel_default" --update-kernel "$entry" $zipl_arg
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[[ $zipl_arg ]] && zipl > /dev/null
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_old_crashkernel=$(get_grub_kernel_boot_parameter "$_kernel" crashkernel)
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_old_fadump_val=$(get_grub_kernel_boot_parameter "$_kernel" fadump)
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if [[ $_old_crashkernel != "$_new_crashkernel" || $_old_fadump_val != "$_new_fadump_val" ]]; then
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_update_grub "$_kernel" "$_new_crashkernel" "$_new_dump_mode" "$_new_fadump_val"
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if [[ $_reboot != yes ]]; then
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if [[ $_old_crashkernel != "$_new_crashkernel" ]]; then
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_what_is_updated="Updated crashkernel=$_new_crashkernel"
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else
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# This case happens only when switching between fadump=on and fadump=nocma
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_what_is_updated="Updated fadump=$_new_fadump_val"
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fi
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dwarn "$_what_is_updated for kernel=$_kernel. Please reboot the system for the change to take effect."
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fi
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_crashkernel_changed=yes
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fi
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done
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if [[ $_reboot == yes && $_crashkernel_changed == yes ]]; then
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reboot
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fi
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}
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@ -1478,7 +1634,8 @@ main()
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get_default_crashkernel "$2"
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;;
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reset-crashkernel)
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reset_crashkernel "$2"
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shift
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reset_crashkernel "$@"
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;;
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*)
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dinfo $"Usage: $0 {estimate|start|stop|status|restart|reload|rebuild|reset-crashkernel|propagate|showmem}"
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19
kdumpctl.8
19
kdumpctl.8
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@ -50,14 +50,19 @@ Estimate a suitable crashkernel value for current machine. This is a
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best-effort estimate. It will print a recommanded crashkernel value
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based on current kdump setup, and list some details of memory usage.
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.TP
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.I reset-crashkernel [KERNEL]
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Reset crashkernel value to default value. kdumpctl will try to read
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from /usr/lib/modules/<KERNEL>/crashkernel.default and reset specified
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kernel's crashkernel cmdline value. If no kernel is
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specified, will reset current running kernel's crashkernel value.
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If /usr/lib/modules/<KERNEL>/crashkernel.default doesn't exist, will
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simply exit return 1.
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.I reset-crashkernel [--kernel=path_to_kernel] [--reboot]
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Reset crashkernel to default value recommended by kexec-tools. If no kernel
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is specified, will reset KDUMP_KERNELVER if it's defined in /etc/sysconfig/kdump
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or current running kernel's crashkernel value if KDUMP_KERNELVER is empty. You can
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also specify --kernel=ALL and --kernel=DEFAULT which have the same meaning as
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grubby's kernel-path=ALL and kernel-path=DEFAULT. ppc64le supports FADump and
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supports an additonal [--fadump=[on|off|nocma]] parameter to toggle FADump
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on/off.
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Note: The memory requirements for kdump varies heavily depending on the
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used hardware and system configuration. Thus the recommended
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crashkernel might not work for your specific setup. Please test if
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kdump works after resetting the crashkernel value.
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.SH "SEE ALSO"
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.BR kdump.conf (5),
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