#! /bin/sh
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#
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# kdump
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#
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# Description: The kdump script provides the support:
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# 1. Load a kdump kernel image into memory;
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# 2. Copy away vmcore when system panic.
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#
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#default
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KEXEC=/usr/sbin/kexec
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KEXEC_ARGS="-p"
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MAKEDUMPFILE=/usr/bin/makedumpfile
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MAKEDUMPFILE_ARGS="-E -d 1"
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LOGGER="logger -p info -t kdump"
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if [ -f /etc/sysconfig/kdump.conf ]; then
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. /etc/sysconfig/kdump.conf
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else
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echo "no /etc/sysconfig/kdump.conf"
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exit 1;
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fi
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do_check()
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{
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#check makedumpfile
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if [ ! -e ${MAKEDUMPFILE} -o ! -x ${MAKEDUMPFILE} ] ;then
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echo "No makedumpfile found."
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exit 0
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fi
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#check kexec
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if [ ! -e ${KEXEC} -o ! -x ${KEXEC} ] ;then
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echo "No kexec found."
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exit 0
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fi
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#check whether kdump kernel image exists on the system
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if [ -z "${KDUMP_KIMAGE}" -o ! -f "${KDUMP_KIMAGE}" ]; then
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echo "No kdump kernel image found."
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exit 0
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fi
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if [ "${KDUMP_CMDLINE}"x = "x" ] ; then
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echo "KDUMP_CMDLINE is not configured"
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exit 0
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fi
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}
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do_save_vmcore()
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{
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if [ ${KDUMP_VMCORE_PATH}x = x ]; then
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KDUMP_VMCORE_PATH="/var/crash/`date +"%Y-%m-%d"`"
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fi
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mkdir -p ${KDUMP_VMCORE_PATH}
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echo "Saving a vmcore to ${KDUMP_VMCORE_PATH}."
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${MAKEDUMPFILE} ${MAKEDUMPFILE_ARGS} /proc/vmcore ${KDUMP_VMCORE_PATH}/vmcore-"`date +"%H:%M:%S"`"
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# cp --sparse=always /proc/vmcore ${KDUMP_VMCORE_PATH}/vmcore-"`date +"%H:%M:%S"`"
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rc=$?
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if [ ${rc} == 0 ]; then
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${LOGGER} "Saved a vmcore to ${KDUMP_VMCORE_PATH}."
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else
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${LOGGER} "Failed to save vmcore!"
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fi
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return ${rc}
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}
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do_start()
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{
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#check file
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do_check
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#check whether the running kernel supports kdump.
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if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
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echo "Kdump isn't supported on the running kernel!!!"
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${LOGGER} "Kdump isn't supported on the running kernel!!!"
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return 1
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fi
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#check whether kdump kernel image has been loaded
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rc=`cat /sys/kernel/kexec_crash_loaded`
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if [ ${rc} != 0 ]; then
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echo "Kdump is already running.";
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${LOGGER} "Kdump is already running."
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return 0
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fi
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#check the running kernel cmdline option,insure "crashkernel=" always set.
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grep -q crashkernel= /proc/cmdline
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if [ $? != 0 ]; then
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echo "Kdump isn't supported on the running kernel,please check boot option!!!"
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${LOGGER} "Kdump isn't supported on the running kernel,please check boot option!!!"
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return 1
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fi
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#Load the kdump kernel image
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${KEXEC} ${KEXEC_ARGS} "${KDUMP_KIMAGE}" --append="${KDUMP_CMDLINE}"
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if [ $? != 0 ]; then
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echo "Failed to load kdump kernel!"
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${LOGGER} "Failed to load kdump kernel!"
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return 1
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fi
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echo "Kdump started up."
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${LOGGER} "Kdump started up."
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}
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do_stop()
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{
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${KEXEC} -p -u 2>/dev/null
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if [ $? == 0 ]; then
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echo "Kdump has been stopped."
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${LOGGER} "Kdump has been stopped."
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else
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echo "Failed to stop kdump!"
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${LOGGER} "Failed to stop kdump!"
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fi
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}
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case "$1" in
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start)
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if [ -s /proc/vmcore ]; then
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do_save_vmcore
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reboot
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else
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do_start
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fi
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;;
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restart)
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do_stop
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do_start
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;;
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stop)
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do_stop
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;;
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*)
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echo $"Usage: $0 {start|stop|restart}"
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exit 1
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esac
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exit $?
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