396 lines
9.2 KiB
Bash
396 lines
9.2 KiB
Bash
#! /bin/sh
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### BEGIN INIT INFO
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# Provides: kdump
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# Default-Start: 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: start and stop kdump crash recovery service
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# Description: The kdump init script provides the support necessary for
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# loading a kdump kernel into memory at system bootup time,
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# and for copying away a vmcore at system panic time.
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### END INIT INFO
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# Copyright 2005 Red Hat, Inc.
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#
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# chkconfig: - 20 80
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#
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# Author: Jeff Moyer <jmoyer@redhat.com>
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# Source function library.
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. /etc/init.d/functions
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KEXEC=/sbin/kexec
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# Will be different for ia64, for example. For now, that architecture isn't
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# supported. Code needs to be added here when we do.
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BOOTDIR="/boot"
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KDUMP_KERNELVER=""
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KDUMP_COMMANDLINE=""
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KEXEC_ARGS=""
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KDUMP_CONFIG_FILE="/etc/kdump.conf"
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LOGGER="/usr/bin/logger -p info -t kdump"
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standard_kexec_args="-p"
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if [ -f /etc/sysconfig/kdump ]; then
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. /etc/sysconfig/kdump
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fi
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function save_core()
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{
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coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"
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mkdir -p $coredir
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cp --sparse=always /proc/vmcore $coredir/vmcore-incomplete
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if [ $? == 0 ]; then
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mv $coredir/vmcore-incomplete $coredir/vmcore
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$LOGGER "saved a vmcore to $coredir"
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else
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$LOGGER "failed to save a vmcore to $coredir"
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fi
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}
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function check_config()
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{
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if [ -f /etc/kdump-adv-conf/initramfs.conf ]
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then
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$LOGGER "Using Kdump advanced configuration service"
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if [ -n "$DRACUT_CMD" ]
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then
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MKDUMPRD=$DRACUT_CMD
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else
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MKDUMPRD="dracut -c /etc/kdump-adv-conf/initramfs.conf"
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fi
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# We always rebuild here, since it takes longer
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# to figure out if anything has changed
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touch /etc/kdump.conf
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else
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MKDUMPRD="/sbin/mkdumprd -d -f"
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fi
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if [ -z "$KDUMP_KERNELVER" ]; then
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local running_kernel=`uname -r`
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kdump_kver=`echo $running_kernel | sed 's/smp//g'`
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else
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kdump_kver=$KDUMP_KERNELVER
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fi
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kdump_kernel="${KDUMP_BOOTDIR}/${KDUMP_IMG}-${kdump_kver}${KDUMP_IMG_EXT}"
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kdump_initrd="${KDUMP_BOOTDIR}/initrd-${kdump_kver}kdump.img"
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if [ ! -f $kdump_kernel ]; then
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echo -n "No kdump kernel image found."; warning; echo
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echo "Tried to locate ${kdump_kernel}"
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return 0
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fi
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if [ ! -f $kdump_initrd ]; then
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echo -n "No kdump initial ramdisk found."; warning; echo
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echo "Rebuilding $kdump_initrd"
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$MKDUMPRD $kdump_initrd $kdump_kver
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if [ $? != 0 ]; then
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echo "Failed to run mkdumprd"
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$LOGGER "mkdumprd: failed to make kdump initrd"
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exit 1
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fi
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return 0
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fi
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#check to see if config file has been modified after
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#last build of the image file
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config_time=0
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if [ -f $KDUMP_CONFIG_FILE ]; then
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config_time=`stat -c "%Y" $KDUMP_CONFIG_FILE`
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fi
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kernel_time=`stat -c "%Y" $kdump_kernel`
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image_time=`stat -c "%Y" $kdump_initrd`
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if [ "$config_time" -gt "$image_time" ] ||
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[ "$kernel_time" -gt "$image_time" ]; then
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echo "Detected $KDUMP_CONFIG_FILE or $kdump_kernel change"
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echo "Rebuilding $kdump_initrd"
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$MKDUMPRD -d -f $kdump_initrd $kdump_kver
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if [ $? != 0 ]; then
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echo "Failed to run mkdumprd"
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$LOGGER "mkdumprd: failed to make kdump initrd"
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return 1
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fi
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fi
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}
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# This function check iomem and determines if we have more than
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# 4GB of ram available. Returns 1 if we do, 0 if we dont
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function need_64bit_headers()
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{
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MEMSZ=`sed -e's/\(^[0-9]\+.*\)/0x\1/' -e's/\(-\)\(.*\)/ 0x\2/' /proc/iomem | \
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awk 'BEGIN {
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totalmem=0;
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segmentmem=0;
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}
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/.*RAM.*/ {
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start = strtonum($1);
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end = strtonum($2);
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segmentmem=end-start;
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totalmem=totalmem+(segmentmem/1024);
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if (end >= 4194304) {
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totalmem=totalmem+4194304;
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}
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}
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END {
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printf "%d", (totalmem+1);
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}'`
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#The AWK script above computes the total number of KB
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#in the RAM areas of /proc/iomem
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#Note also that we set totalmem to 4GB in the event that
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#any physical address is larger than 4GB. This lets us
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#default to 64 bit ELF headers for PAE kernels, which
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#need then to access those higher addresses.
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#This comparison tells us if the above amount is more than
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#4GB (4096 KB). I do the funny math to avoid overflow
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if [ $MEMSZ -ge 4194304 ]
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then
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return 1
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fi
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return 0
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}
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# Load the kdump kerel specified in /etc/sysconfig/kdump
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# If none is specified, try to load a kdump kernel with the same version
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# as the currently running kernel.
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function load_kdump()
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{
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if [ -z "$KDUMP_COMMANDLINE" ]
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then
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KDUMP_COMMANDLINE=`cat /proc/cmdline`
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fi
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ARCH=`uname -m`
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if [ "$ARCH" == "ppc64" ]
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then
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MEM_RESERVED=`grep "crashkernel=[0-9]\+[MmKkGg]@[0-9]\+[MmGgKk]" /proc/cmdline`
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else
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MEM_RESERVED=`grep "Crash kernel" /proc/iomem | grep -v "00000000-00000000"`
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fi
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if [ -z "$MEM_RESERVED" ]
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then
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$LOGGER "No crashkernel parameter specified for running kernel"
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return 1
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fi
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if [ "$ARCH" == "i686" -o "$ARCH" == "i386" ]
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then
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need_64bit_headers
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if [ $? == 1 ]
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then
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FOUND_ELF_ARGS=`echo $KEXEC_ARGS | grep elf32-core-headers`
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if [ -n "$FOUND_ELF_ARGS" ]
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then
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echo -n "Warning: elf32-core-headers overrides correct elf64 setting"
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warning
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echo
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else
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KEXEC_ARGS="$KEXEC_ARGS --elf64-core-headers"
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fi
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else
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FOUND_ELF_ARGS=`echo $KEXEC_ARGS | grep elf64-core-headers`
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if [ -z "$FOUND_ELF_ARGS" ]
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then
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KEXEC_ARGS="$KEXEC_ARGS --elf32-core-headers"
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fi
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fi
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fi
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KDUMP_COMMANDLINE=`echo $KDUMP_COMMANDLINE | sed -e 's/crashkernel=[0-9]\+[MmKkGg]@[0-9]\+[MmGgKk]//'`
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KDUMP_COMMANDLINE="${KDUMP_COMMANDLINE} ${KDUMP_COMMANDLINE_APPEND}"
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$KEXEC $KEXEC_ARGS $standard_kexec_args \
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--command-line="$KDUMP_COMMANDLINE" \
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--initrd=$kdump_initrd $kdump_kernel 2>/dev/null
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if [ $? == 0 ]; then
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$LOGGER "kexec: loaded kdump kernel"
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return 0
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else
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$LOGGER "kexec: failed to load kdump kernel"
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return 1
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fi
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}
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function propagate_ssh_key()
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{
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#Check if selinux is on... must flip to permissive mode
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#for the moment to create key, then flip back...
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se_enforce=`/usr/sbin/sestatus | grep -c "^Current mode.*enforcing"`
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if [ "$se_enforce" -ge 1 ]; then
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/usr/sbin/setenforce 0 2>&1 > /dev/null
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fi
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#Use dedicated key for kdump
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if [ ! -d /root/.ssh ]; then
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mkdir /root/.ssh
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chmod 700 /root/.ssh
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fi
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if [ ! -e /root/.ssh/config ]; then
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echo "IdentityFile ~/.ssh/kdump_id_rsa" >> /root/.ssh/config
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elif [ `grep -c kdump_id_rsa /root/.ssh/config` -eq 0 ]; then
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echo "IdentityFile ~/.ssh/kdump_id_rsa" >> /root/.ssh/config
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fi
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local KEYFILE=/root/.ssh/kdump_id_rsa.pub
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local errmsg="Failed to propagate ssh key"
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#make sure they've configured kdump.conf for ssh dumps
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local SSH_TARGET=`awk '/^\ *net.*@.*$/ {print $0}' $KDUMP_CONFIG_FILE`
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if [ -z "$SSH_TARGET" ]; then
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echo "No ssh config specified in $KDUMP_CONFIG_FILE. Can't propagate"
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$LOGGER "$errmsg, no ssh config specified in $KDUMP_CONFIG_FILE"
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exit 1
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fi
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#Check to see if we already created key, if not, create it.
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if [ -f $KEYFILE ]; then
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echo "Using existing keys..."
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else
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echo -n "Generating new ssh keys... "
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/usr/bin/ssh-keygen -t rsa -f /root/.ssh/kdump_id_rsa -N "" 2>&1 > /dev/null
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echo "done."
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fi
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#If necessary, flip selinux back to enforcing
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if [ "$se_enforce" -ge 1 ]; then
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/usr/sbin/setenforce 1 2>&1 > /dev/null
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fi
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#now find the target ssh user and server to contact.
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SSH_USER=`echo $SSH_TARGET | cut -d\ -f2 | cut -d@ -f1`
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SSH_SERVER=`echo $SSH_TARGET | sed -e's/\(.*@\)\(.*$\)/\2/'`
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#now send the found key to the found server
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cat $KEYFILE | ssh -x $SSH_USER@$SSH_SERVER "mkdir -p ~$SSH_USER/.ssh; chmod 700 ~$SSH_USER/.ssh; cat >> ~$SSH_USER/.ssh/authorized_keys2; chmod 600 ~$SSH_USER/.ssh/authorized_keys2"
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RET=$?
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if [ $RET == 0 ]; then
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echo $KEYFILE has been added to ~$SSH_USER/.ssh/authorized_keys2 on $SSH_SERVER
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$LOGGER "propagated ssh key (ssh server: $SSH_SERVER)"
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return 0
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else
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echo $KEYFILE failed in transfer to $SSH_SERVER
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$LOGGER "$errmsg, unable to transfer $KEYFILE to $SSH_SERVER"
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exit 1
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fi
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}
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function status()
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{
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if [ ! -e /sys/kernel/kexec_crash_loaded ]
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then
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return 2
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fi
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rc=`cat /sys/kernel/kexec_crash_loaded`
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if [ $rc == 1 ]; then
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return 0
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else
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return 1
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fi
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}
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function start()
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{
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#TODO check raw partition for core dump image
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status
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rc=$?
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if [ $rc == 2 ]; then
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echo -n "Kdump is not supported on this kernel"; failure; echo
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return 1;
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else
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if [ $rc == 0 ]; then
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echo -n "Kdump already running"; success; echo
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return 0
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fi
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fi
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check_config
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if [ $? != 0 ]; then
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echo -n "Starting kdump:"; failure; echo
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$LOGGER "failed to start up, config file incorrect"
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return 1
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fi
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load_kdump
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if [ $? != 0 ]; then
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echo -n "Starting kdump:"; failure; echo
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$LOGGER "failed to start up"
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return 1
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fi
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echo -n "Starting kdump:"; success; echo
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$LOGGER "started up"
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}
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function stop()
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{
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$KEXEC -p -u 2>/dev/null
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if [ $? == 0 ]; then
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$LOGGER "kexec: unloaded kdump kernel"
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echo -n "Stopping kdump:"; success; echo
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$LOGGER "stopped"
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return 0
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else
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$LOGGER "kexec: failed to unload kdump kernel"
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echo -n "Stopping kdump:"; failure; echo
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$LOGGER "failed to stop"
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return 1
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fi
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}
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case "$1" in
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start)
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if [ -s /proc/vmcore ]; then
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save_core
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reboot
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else
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start
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fi
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;;
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stop)
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stop
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;;
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status)
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EXIT_CODE=0
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status
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case "$?" in
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0)
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echo "Kdump is operational"
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;;
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1)
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echo "Kdump is not operational"
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EXIT_CODE=1
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;;
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2)
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echo "Kdump is unsupported on this kernel"
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EXIT_CODE=1
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;;
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esac
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exit $EXIT_CODE
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;;
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restart)
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stop
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start
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;;
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condrestart)
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;;
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propagate)
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propagate_ssh_key
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;;
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*)
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echo $"Usage: $0 {start|stop|status|restart|propagate}"
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exit 1
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esac
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exit $?
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