kexec-tools/dracut-kdump.sh

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#!/bin/sh
exec >&2
. /lib/dracut-lib.sh
set -o pipefail
KDUMP_PATH="/var/crash"
CORE_COLLECTOR=""
DEFAULT_CORE_COLLECTOR="makedumpfile -c --message-level 1 -d 31"
DMESG_COLLECTOR="/sbin/vmcore-dmesg"
DEFAULT_ACTION="reboot -f"
DATEDIR=`date +%Y.%m.%d-%T`
HOST_IP='127.0.0.1'
DUMP_INSTRUCTION=""
SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
KDUMP_SCRIPT_DIR="/kdumpscripts"
DD_BLKSIZE=512
FINAL_ACTION="reboot -f"
DUMP_RETVAL=0
conf_file="/etc/kdump.conf"
KDUMP_PRE=""
KDUMP_POST=""
MOUNTS=""
export PATH=$PATH:$KDUMP_SCRIPT_DIR
do_umount()
{
if [ -n "$MOUNTS" ]; then
for mount in $MOUNTS; do
ismounted $mount && umount -R $mount
done
fi
}
do_final_action()
{
do_umount
eval $FINAL_ACTION
}
do_default_action()
{
wait_for_loginit
eval $DEFAULT_ACTION
}
do_kdump_pre()
{
if [ -n "$KDUMP_PRE" ]; then
"$KDUMP_PRE"
fi
}
do_kdump_post()
{
if [ -n "$KDUMP_POST" ]; then
"$KDUMP_POST" "$1"
fi
}
add_dump_code()
{
DUMP_INSTRUCTION=$1
}
dump_fs()
{
echo "kdump: dump target is $1"
local _mp=$(findmnt -k -f -n -r -o TARGET $1)
if [ -z "$_mp" ]; then
echo "kdump: error: Dump target $1 is not mounted."
return 1
fi
MOUNTS="$MOUNTS $_mp"
echo "kdump: saving to $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
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if [ "$_mp" = "$NEWROOT/" ] || [ "$_mp" = "$NEWROOT" ]
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then
mount -o remount,rw $_mp || return 1
fi
mkdir -p $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR || return 1
save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
echo "kdump: saving vmcore"
$CORE_COLLECTOR /proc/vmcore $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete || return 1
mv $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore
echo "kdump: saving vmcore complete"
return 0
}
dump_raw()
{
local _raw=$1
[ -b "$_raw" ] || return 1
echo "kdump: saving to raw disk $_raw"
if ! $(echo -n $CORE_COLLECTOR|grep -q makedumpfile); then
_src_size=`ls -l /proc/vmcore | cut -d' ' -f5`
_src_size_mb=$(($_src_size / 1048576))
monitor_dd_progress $_src_size_mb &
fi
echo "kdump: saving vmcore"
$CORE_COLLECTOR /proc/vmcore | dd of=$_raw bs=$DD_BLKSIZE >> /tmp/dd_progress_file 2>&1 || return 1
echo "kdump: saving vmcore complete"
return 0
}
dump_to_rootfs()
{
echo "kdump: dump target is root fs"
echo "kdump: saving to $NEWROOT/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
MOUNTS="$MOUNTS $NEWROOT"
#For dumping to rootfs, "-F" need be removed. Surely only available for makedumpfile case.
[[ $CORE_COLLECTOR = *makedumpfile* ]] && CORE_COLLECTOR=`echo $CORE_COLLECTOR | sed -e s/-F//g`
mount -o remount,rw $NEWROOT/ || return 1
mkdir -p $NEWROOT/$KDUMP_PATH/$HOST_IP-$DATEDIR
save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$NEWROOT/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
echo "kdump: saving vmcore"
$CORE_COLLECTOR /proc/vmcore $NEWROOT/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete || return 1
mv $NEWROOT/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete $NEWROOT/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore
echo "kdump: saving vmcore complete"
sync
return 0
}
dump_ssh()
{
local _opt="-i $1 -o BatchMode=yes -o StrictHostKeyChecking=yes"
local _dir="$KDUMP_PATH/$HOST_IP-$DATEDIR"
local _host=$2
echo "kdump: saving to $_host:$_dir"
cat /var/lib/random-seed > /dev/urandom
ssh -q $_opt $_host mkdir -p $_dir || return 1
save_vmcore_dmesg_ssh ${DMESG_COLLECTOR} ${_dir} "${_opt}" $_host
echo "kdump: saving vmcore"
if [ "${CORE_COLLECTOR%%[[:blank:]]*}" = "scp" ]; then
scp -q $_opt /proc/vmcore "$_host:$_dir/vmcore-incomplete" || return 1
ssh $_opt $_host "mv $_dir/vmcore-incomplete $_dir/vmcore" || return 1
else
$CORE_COLLECTOR /proc/vmcore | ssh $_opt $_host "dd bs=512 of=$_dir/vmcore-incomplete" || return 1
ssh $_opt $_host "mv $_dir/vmcore-incomplete $_dir/vmcore.flat" || return 1
fi
echo "kdump: saving vmcore complete"
return 0
}
save_vmcore_dmesg_fs() {
local _dmesg_collector=$1
local _path=$2
echo "kdump: saving vmcore-dmesg.txt"
$_dmesg_collector /proc/vmcore > ${_path}/vmcore-dmesg-incomplete.txt
_exitcode=$?
if [ $_exitcode -eq 0 ]; then
mv ${_path}/vmcore-dmesg-incomplete.txt ${_path}/vmcore-dmesg.txt
echo "kdump: saving vmcore-dmesg.txt complete"
else
echo "kdump: saving vmcore-dmesg.txt failed"
fi
}
save_vmcore_dmesg_ssh() {
local _dmesg_collector=$1
local _path=$2
local _opts="$3"
local _location=$4
echo "kdump: saving vmcore-dmesg.txt"
$_dmesg_collector /proc/vmcore | ssh $_opts $_location "dd of=$_path/vmcore-dmesg-incomplete.txt"
_exitcode=$?
if [ $_exitcode -eq 0 ]; then
ssh -q $_opts $_location mv $_path/vmcore-dmesg-incomplete.txt $_path/vmcore-dmesg.txt
echo "kdump: saving vmcore-dmesg.txt complete"
else
echo "kdump: saving vmcore-dmesg.txt failed"
fi
}
is_ssh_dump_target()
{
grep -q "^ssh[[:blank:]].*@" $conf_file
}
is_nfs_dump_target()
{
grep -q "^nfs.*:" $conf_file
}
is_raw_dump_target()
{
grep -q "^raw" $conf_file
}
get_host_ip()
{
local _host
if is_nfs_dump_target || is_ssh_dump_target
then
kdumpnic=$(getarg kdumpnic=)
[ -z "$kdumpnic" ] && echo "kdump: failed to get kdumpnic!" && return 1
_host=`ip addr show dev $kdumpnic|grep 'inet '`
[ $? -ne 0 ] && echo "kdump: wrong kdumpnic: $kdumpnic" && return 1
_host="${_host##*inet }"
_host="${_host%%/*}"
[ -z "$_host" ] && echo "kdump: wrong kdumpnic: $kdumpnic" && return 1
HOST_IP=$_host
fi
return 0
}
read_kdump_conf()
{
if [ ! -f "$conf_file" ]; then
echo "kdump: $conf_file not found"
return
fi
# first get the necessary variables
while read config_opt config_val;
do
case "$config_opt" in
path)
KDUMP_PATH="$config_val"
;;
core_collector)
[ -n "$config_val" ] && CORE_COLLECTOR="$config_val"
;;
sshkey)
if [ -f "$config_val" ]; then
SSH_KEY_LOCATION=$config_val
fi
;;
kdump_pre)
KDUMP_PRE="$config_val"
;;
kdump_post)
KDUMP_POST="$config_val"
;;
default)
case $config_val in
shell)
DEFAULT_ACTION="_emergency_shell kdump"
;;
reboot)
DEFAULT_ACTION="do_umount; reboot -f"
;;
halt)
DEFAULT_ACTION="do_umount; halt -f"
;;
poweroff)
DEFAULT_ACTION="do_umount; poweroff -f"
;;
dump_to_rootfs)
DEFAULT_ACTION="dump_to_rootfs"
;;
esac
;;
esac
done < $conf_file
# rescan for add code for dump target
while read config_opt config_val;
do
case "$config_opt" in
ext[234]|xfs|btrfs|minix|nfs)
add_dump_code "dump_fs $config_val"
;;
raw)
add_dump_code "dump_raw $config_val"
;;
ssh)
add_dump_code "dump_ssh $SSH_KEY_LOCATION $config_val"
;;
esac
done < $conf_file
}
read_kdump_conf
if [ -z "$CORE_COLLECTOR" ];then
CORE_COLLECTOR=$DEFAULT_CORE_COLLECTOR
if is_ssh_dump_target || is_raw_dump_target; then
CORE_COLLECTOR="$CORE_COLLECTOR -F"
fi
fi
get_host_ip
if [ $? -ne 0 ]; then
echo "kdump: get_host_ip exited with non-zero status!"
do_default_action
do_final_action
fi
if [ -z "$DUMP_INSTRUCTION" ]; then
add_dump_code "dump_to_rootfs"
fi
do_kdump_pre
if [ $? -ne 0 ]; then
echo "kdump: kdump_pre script exited with non-zero status!"
do_final_action
fi
$DUMP_INSTRUCTION
DUMP_RETVAL=$?
do_kdump_post $DUMP_RETVAL
if [ $? -ne 0 ]; then
echo "kdump: kdump_post script exited with non-zero status!"
fi
if [ $DUMP_RETVAL -ne 0 ]; then
do_default_action
fi
do_final_action