poky/meta/recipes-kernel/kexec/kexec-tools/kdump

#! /bin/sh

kdump

Description: The kdump script provides the support:

1. Load a kdump kernel image into memory;

2. Copy away vmcore when system panic.

#default KDUMP_KVER="uname -r" KDUMP_KIMAGE="/boot/bzImage-${KDUMP_KVER}" KDUMP_CMDLINE="cat /proc/cmdline" KDUMP_CMDLINE_APPEND="kdump_needed maxcpus=1 irqpoll reset_devices" KDUMP_VMCORE_PATH="/var/crash/date +"%Y-%m-%d""

#get right kernel image march="uname -m" case ${march} in x86*|i?86) ;; *) KDUMP_KIMAGE="/boot/uImage-${KDUMP_KVER}" ;; esac

KEXEC=usr/sbin/kexec KEXEC_ARGS="-p"

MAKEDUMPFILE=/usr/bin/makedumpfile MAKEDUMPFILE_ARGS="-E -d 1"

LOGGER="logger -p info -t kdump"

if [ -f /etc/sysconfig/kdump.conf ]; then . /etc/sysconfig/kdump.conf fi

do_check() { #check makedumpfile if [ ! -e ${MAKEDUMPFILE} -o ! -x ${MAKEDUMPFILE} ] ;then echo "No makedumpfile found." return 1; fi

#check kexec
if [ ! -e ${KEXEC} -o ! -x ${KEXEC} ] ;then
	echo "No kexec found."
	return 1;
fi

#check whether kdump kernel image exists on the system
if [ ! -f ${KDUMP_KIMAGE} ]; then
	echo "No kdump kernel image found."
	return 1
fi

}

do_save_vmcore() { mkdir -p ${KDUMP_VMCORE_PATH} echo "Saving a vmcore to ${KDUMP_VMCORE_PATH}."

${MAKEDUMPFILE} ${MAKEDUMPFILE_ARGS} /proc/vmcore ${KDUMP_VMCORE_PATH}/vmcore-"`date +"%H:%M:%S"`"

cp --sparse=always /proc/vmcore ${KDUMP_VMCORE_PATH}/vmcore-"date +"%H:%M:%S""

rc=$?
if [ ${rc} == 0 ]; then
	${LOGGER} "Saved a vmcore to ${KDUMP_VMCORE_PATH}."
else
	${LOGGER} "Failed to save vmcore!"
fi
return ${rc}

}

do_start() { #check file do_check

#check whether the running kernel supports kdump.
if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
	echo "Kdump isn't supported on the running kernel!!!"
	${LOGGER} "Kdump isn't supported on the running kernel!!!"
	return 1
fi

#check whether kdump kernel image has been loaded
rc=`cat /sys/kernel/kexec_crash_loaded`
if [ ${rc} != 0 ]; then
	echo "Kdump is already running.";
	${LOGGER} "Kdump is already running."
	return 0
fi

#check the running kernel cmdline option,insure "crashkenrel=" always set.
grep -q crashkernel= /proc/cmdline
if [ $? != 0 ]; then
	echo "Kdump isn't supported on the running kernel,please check boot option!!!"
	${LOGGER} "Kdump isn't supported on the running kernel,please check boot option!!!"
	return 1
fi

#handle kdump cmdline parameters, remove some useless options
kcmdline=""
for x in `cat /proc/cmdline`; do
	case $x in
		crashkernel*)
			;;
		*)
			kcmdline="${kcmdline} $x"
			;;
	esac
done

KDUMP_CMDLINE="${kcmdline} ${KDUMP_CMDLINE_APPEND}"

#Load the kdump kernel image
${KEXEC} ${KEXEC_ARGS} "${KDUMP_KIMAGE}" --append="${KDUMP_CMDLINE}"
if [ $? != 0 ]; then
	echo "Failed to load kdump kernel!"
	${LOGGER} "Failed to load kdump kernel!"
	return 1
fi

echo "Kdump started up."
${LOGGER} "Kdump started up."

}

do_stop() { ${KEXEC} -p -u 2>/dev/null if [ $? == 0 ]; then echo "Kdump has been stopped." ${LOGGER} "Kdump has been stopped." else echo "Failed to stop kdump!" ${LOGGER} "Failed to stop kdump!" fi }

case "$1" in start) if [ -s /proc/vmcore ]; then do_save_vmcore reboot else do_start fi ;; restart) do_stop do_start ;; stop) do_stop ;; *) echo $"Usage: $0 {start|stop|restart}" exit 1 esac

exit $?