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