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Linux gator3171.hostgator.com 4.19.286-203.ELK.el7.x86_64 #1 SMP Wed Jun 14 04:33:55 CDT 2023 x86_64 |
| Current File : //bin/kdumpctl |
#!/bin/bash
KEXEC=/sbin/kexec
KDUMP_KERNELVER=""
KDUMP_COMMANDLINE=""
KEXEC_ARGS=""
KDUMP_CONFIG_FILE="/etc/kdump.conf"
MKDUMPRD="/sbin/mkdumprd -f"
DRACUT_MODULES_FILE="/usr/lib/dracut/modules.txt"
SAVE_PATH=/var/crash
SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
INITRD_CHECKSUM_LOCATION="/boot/.fadump_initrd_checksum"
DUMP_TARGET=""
DEFAULT_INITRD=""
DEFAULT_INITRD_BAK=""
TARGET_INITRD=""
FADUMP_REGISTER_SYS_NODE="/sys/kernel/fadump_registered"
#kdump shall be the default dump mode
DEFAULT_DUMP_MODE="kdump"
image_time=0
. /lib/kdump/kdump-lib.sh
standard_kexec_args="-p"
# Some default values in case /etc/sysconfig/kdump doesn't include
KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug"
if [ -f /etc/sysconfig/kdump ]; then
. /etc/sysconfig/kdump
fi
single_instance_lock()
{
local rc timeout=5
exec 9>/var/lock/kdump
if [ $? -ne 0 ]; then
echo "Create file lock failed"
exit 1
fi
flock -n 9
rc=$?
while [ $rc -ne 0 ]; do
echo "Another app is currently holding the kdump lock; waiting for it to exit..."
flock -w $timeout 9
rc=$?
done
}
determine_dump_mode()
{
# Check if firmware-assisted dump is enabled
# if yes, set the dump mode as fadump
if is_fadump_capable; then
echo "Dump mode is fadump"
DEFAULT_DUMP_MODE="fadump"
fi
}
# remove_cmdline_param <kernel cmdline> <param1> [<param2>] ... [<paramN>]
# Remove a list of kernel parameters from a given kernel cmdline and print the result.
# For each "arg" in the removing params list, "arg" and "arg=xxx" will be removed if exists.
remove_cmdline_param()
{
local cmdline=$1
shift
for arg in $@; do
cmdline=`echo $cmdline | \
sed -e "s/\b$arg=[^ ]*//g" \
-e "s/^$arg\b//g" \
-e "s/[[:space:]]$arg\b//g" \
-e "s/\s\+/ /g"`
done
echo $cmdline
}
#
# This function returns the "apicid" of the boot
# cpu (cpu 0) if present.
#
get_bootcpu_apicid()
{
awk ' \
BEGIN { CPU = "-1"; } \
$1=="processor" && $2==":" { CPU = $NF; } \
CPU=="0" && /^apicid/ { print $NF; } \
' \
/proc/cpuinfo
}
#
# This function appends argument "$2=$3" to string ($1) if not already present.
#
append_cmdline()
{
local cmdline=$1
local newstr=${cmdline/$2/""}
# unchanged str implies argument wasn't there
if [ "$cmdline" == "$newstr" ]; then
cmdline="${cmdline} ${2}=${3}"
fi
echo $cmdline
}
# This function performs a series of edits on the command line.
# Store the final result in global $KDUMP_COMMANDLINE.
prepare_cmdline()
{
local cmdline id
if [ -z "$KDUMP_COMMANDLINE" ]; then
cmdline=$(cat /proc/cmdline)
else
cmdline=${KDUMP_COMMANDLINE}
fi
# These params should always be removed
cmdline=$(remove_cmdline_param "$cmdline" crashkernel panic_on_warn)
# These params can be removed configurably
cmdline=$(remove_cmdline_param "$cmdline" ${KDUMP_COMMANDLINE_REMOVE})
# Always remove "root=X", as we now explicitly generate all kinds
# of dump target mount information including root fs.
#
# We do this before KDUMP_COMMANDLINE_APPEND, if one really cares
# about it(e.g. for debug purpose), then can pass "root=X" using
# KDUMP_COMMANDLINE_APPEND.
cmdline=$(remove_cmdline_param "$cmdline" root)
# With the help of "--hostonly-cmdline", we can avoid some interitage.
cmdline=$(remove_cmdline_param "$cmdline" rd.lvm.lv rd.luks.uuid rd.dm.uuid rd.md.uuid fcoe)
# Remove netroot, rd.iscsi.initiator and iscsi_initiator since
# we get duplicate entries for the same in case iscsi code adds
# it as well.
cmdline=$(remove_cmdline_param "$cmdline" netroot rd.iscsi.initiator iscsi_initiator)
cmdline="${cmdline} ${KDUMP_COMMANDLINE_APPEND}"
id=$(get_bootcpu_apicid)
if [ ! -z ${id} ] ; then
cmdline=$(append_cmdline "${cmdline}" disable_cpu_apicid ${id})
fi
if has_hpwdt; then
cmdline="${cmdline} rd.driver.pre=hpwdt"
fi
KDUMP_COMMANDLINE=$cmdline
}
save_core()
{
coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"
mkdir -p $coredir
cp --sparse=always /proc/vmcore $coredir/vmcore-incomplete
if [ $? == 0 ]; then
mv $coredir/vmcore-incomplete $coredir/vmcore
echo "saved a vmcore to $coredir"
else
echo "failed to save a vmcore to $coredir" >&2
fi
# pass the dmesg to Abrt tool if exists, in order
# to collect the kernel oops message.
# https://fedorahosted.org/abrt/
if [ -x /usr/bin/dumpoops ]; then
makedumpfile --dump-dmesg $coredir/vmcore $coredir/dmesg >/dev/null 2>&1
dumpoops -d $coredir/dmesg >/dev/null 2>&1
if [ $? == 0 ]; then
echo "kernel oops has been collected by abrt tool"
fi
fi
}
rebuild_fadump_initrd()
{
local target_initrd_tmp
# this file tells the initrd is fadump enabled
touch /tmp/fadump.initramfs
target_initrd_tmp="$TARGET_INITRD.tmp"
$MKDUMPRD $target_initrd_tmp --rebuild $DEFAULT_INITRD_BAK --kver $kdump_kver \
-i /tmp/fadump.initramfs /etc/fadump.initramfs
if [ $? != 0 ]; then
echo "mkdumprd: failed to rebuild initrd with fadump support" >&2
rm -f /tmp/fadump.initramfs
return 1
fi
rm -f /tmp/fadump.initramfs
# updating fadump initrd
mv $target_initrd_tmp $TARGET_INITRD
sync
return 0
}
rebuild_kdump_initrd()
{
$MKDUMPRD $TARGET_INITRD $kdump_kver
if [ $? != 0 ]; then
echo "mkdumprd: failed to make kdump initrd" >&2
return 1
fi
return 0
}
rebuild_initrd()
{
if [[ ! -w "$KDUMP_BOOTDIR" ]];then
echo "$KDUMP_BOOTDIR does not have write permission. Can not rebuild $TARGET_INITRD"
return 1
fi
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
rebuild_fadump_initrd
else
rebuild_kdump_initrd
fi
return $?
}
#$1: the files to be checked with IFS=' '
check_exist()
{
for file in $1; do
if [ ! -f "$file" ]; then
echo -n "Error: $file not found."; echo
return 1
fi
done
}
#$1: the files to be checked with IFS=' '
check_executable()
{
for file in $1; do
if [ ! -x "$file" ]; then
echo -n "Error: $file is not executable."; echo
return 1
fi
done
}
backup_default_initrd()
{
if [ ! -f "$DEFAULT_INITRD" ]; then
return
fi
if [ ! -e $DEFAULT_INITRD_BAK ]; then
echo "Backing up $DEFAULT_INITRD before rebuild."
# save checksum to verify before restoring
sha1sum $DEFAULT_INITRD > $INITRD_CHECKSUM_LOCATION
cp $DEFAULT_INITRD $DEFAULT_INITRD_BAK
if [ $? -ne 0 ]; then
echo "WARNING: failed to backup $DEFAULT_INITRD."
rm -f $DEFAULT_INITRD_BAK
fi
fi
}
restore_default_initrd()
{
# If a backup initrd exists, we must be switching back from
# fadump to kdump. Restore the original default initrd.
if [ -f $DEFAULT_INITRD_BAK ] && [ -f $INITRD_CHECKSUM_LOCATION ]; then
# verify checksum before restoring
backup_checksum=`sha1sum $DEFAULT_INITRD_BAK | awk '{ print $1 }'`
default_checksum=`cat $INITRD_CHECKSUM_LOCATION | awk '{ print $1 }'`
if [ "$default_checksum" != "$backup_checksum" ]; then
echo "WARNING: checksum mismatch! Can't restore original initrd.."
else
rm -f $INITRD_CHECKSUM_LOCATION
mv $DEFAULT_INITRD_BAK $DEFAULT_INITRD
if [[ $? -eq 0 ]]; then
echo -n "Restoring original initrd as fadump mode "
echo "is disabled."
sync
fi
fi
fi
}
check_config()
{
local nr
nr=$(awk 'BEGIN{cnt=0} /^raw|^ssh[[:blank:]]|^nfs|^ext[234]|^xfs|^btrfs|^minix|^dracut_args .*\-\-mount/{cnt++} END{print cnt}' $KDUMP_CONFIG_FILE)
[ $nr -gt 1 ] && {
echo "More than one dump targets specified."
return 1
}
nr=$(grep "^dracut_args .*\-\-mount" $KDUMP_CONFIG_FILE | grep -o "\-\-mount" | wc -l)
[ $nr -gt 1 ] && {
echo "Multiple mount targets specified in one \"dracut_args\"."
return 1
}
# Check if we have any leading spaces (or tabs) before the
# variable name in the kdump conf file
if grep -E -q '^[[:blank:]]+[a-z]' $KDUMP_CONFIG_FILE; then
echo "No whitespaces are allowed before a kdump option name in $KDUMP_CONFIG_FILE"
return 1
fi
while read config_opt config_val; do
case "$config_opt" in
\#* | "")
;;
raw|ext2|ext3|ext4|minix|btrfs|xfs|nfs|ssh|sshkey|path|core_collector|kdump_post|kdump_pre|extra_bins|extra_modules|default|force_rebuild|force_no_rebuild|dracut_args|fence_kdump_args|fence_kdump_nodes)
# remove inline comments after the end of a directive.
[ -z "$config_val" ] && {
echo "Invalid kdump config value for option $config_opt."
return 1;
}
;;
net|options|link_delay|disk_timeout|debug_mem_level|blacklist)
echo "Deprecated kdump config option: $config_opt. Refer to kdump.conf manpage for alternatives."
return 1
;;
*)
echo "Invalid kdump config option $config_opt"
return 1;
;;
esac
done <<< "$(read_strip_comments $KDUMP_CONFIG_FILE)"
check_default_config || return 1
check_fence_kdump_config || return 1
return 0
}
# get_pcs_cluster_modified_files <image timestamp>
# return list of modified file for fence_kdump modified in Pacemaker cluster
get_pcs_cluster_modified_files()
{
local time_stamp
local modified_files
is_generic_fence_kdump && return 1
is_pcs_fence_kdump || return 1
time_stamp=`pcs cluster cib | xmllint --xpath 'string(/cib/@cib-last-written)' - | \
xargs -0 date +%s --date`
if [ -n $time_stamp -a $time_stamp -gt $image_time ]; then
modified_files="cluster-cib"
fi
if [ -f $FENCE_KDUMP_CONFIG_FILE ]; then
time_stamp=`stat -c "%Y" $FENCE_KDUMP_CONFIG_FILE`
if [ "$time_stamp" -gt "$image_time" ]; then
modified_files="$modified_files $FENCE_KDUMP_CONFIG_FILE"
fi
fi
echo $modified_files
}
check_boot_dir()
{
#If user specify a boot dir for kdump kernel, let's use it. Otherwise
#check whether it's a atomic host. If yes parse the subdirectory under
#/boot; If not just find it under /boot.
[ -n "$KDUMP_BOOTDIR" ] && return
if ! is_atomic || [ "$(uname -m)" = "s390x" ]; then
KDUMP_BOOTDIR="/boot"
else
eval $(cat /proc/cmdline| grep "BOOT_IMAGE" | cut -d' ' -f1)
KDUMP_BOOTDIR="/boot"$(dirname $BOOT_IMAGE)
fi
}
setup_initrd()
{
check_boot_dir
if [ -z "$KDUMP_KERNELVER" ]; then
kdump_kver=`uname -r`
else
kdump_kver=$KDUMP_KERNELVER
fi
kdump_kernel="${KDUMP_BOOTDIR}/${KDUMP_IMG}-${kdump_kver}${KDUMP_IMG_EXT}"
DEFAULT_INITRD="${KDUMP_BOOTDIR}/initramfs-`uname -r`.img"
DEFAULT_INITRD_BAK="${KDUMP_BOOTDIR}/.initramfs-`uname -r`.img.default"
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
TARGET_INITRD="$DEFAULT_INITRD"
# backup initrd for reference before replacing it
# with fadump aware initrd
backup_default_initrd
else
TARGET_INITRD="${KDUMP_BOOTDIR}/initramfs-${kdump_kver}kdump.img"
# check if a backup of default initrd exists. If yes,
# it signifies a switch from fadump mode. So, restore
# the backed up default initrd.
restore_default_initrd
fi
}
check_files_modified()
{
local modified_files=""
#also rebuild when Pacemaker cluster conf is changed and fence kdump is enabled.
modified_files=$(get_pcs_cluster_modified_files)
EXTRA_BINS=`grep ^kdump_post $KDUMP_CONFIG_FILE | cut -d\ -f2`
CHECK_FILES=`grep ^kdump_pre $KDUMP_CONFIG_FILE | cut -d\ -f2`
CORE_COLLECTOR=`grep ^core_collector $KDUMP_CONFIG_FILE | cut -d\ -f2`
CORE_COLLECTOR=`type -P $CORE_COLLECTOR`
EXTRA_BINS="$EXTRA_BINS $CHECK_FILES"
CHECK_FILES=`grep ^extra_bins $KDUMP_CONFIG_FILE | cut -d\ -f2-`
EXTRA_BINS="$EXTRA_BINS $CHECK_FILES"
files="$KDUMP_CONFIG_FILE $kdump_kernel $EXTRA_BINS $CORE_COLLECTOR"
[[ -e /etc/fstab ]] && files="$files /etc/fstab"
check_exist "$files" && check_executable "$EXTRA_BINS"
[ $? -ne 0 ] && return 2
for file in $files; do
time_stamp=`stat -c "%Y" $file`
if [ "$time_stamp" -gt "$image_time" ]; then
modified_files="$modified_files $file"
fi
done
if [ -n "$modified_files" ]; then
echo "Detected change(s) in the following file(s):"
echo -n " "; echo "$modified_files" | sed 's/\s/\n /g'
return 1
fi
return 0
}
check_dump_fs_modified()
{
local _old_dev _old_mntpoint _old_fstype
local _new_dev _new_mntpoint _new_fstype
local _target _path _dracut_args
local _target_drivers _module_name
local _old_drivers="$(lsinitrd $TARGET_INITRD -f /usr/lib/dracut/loaded-kernel-modules.txt | tr '\n' ' ')"
# No need to check in case of mount target specified via "dracut_args".
if is_mount_in_dracut_args; then
return 0
fi
# No need to check in case of raw target.
# Currently we do not check also if ssh/nfs target is specified
if is_ssh_dump_target || is_nfs_dump_target || is_raw_dump_target; then
return 0
fi
_target=$(get_user_configured_dump_disk)
if [[ -n "$_target" ]]; then
_target=$(to_dev_name $_target)
_new_fstype=$(blkid $_target | awk -F"TYPE=" '{print $2}' | cut -d '"' -f 2)
else
_path=$(get_save_path)
set -- $(df -T $_path 2>/dev/null | tail -1 | awk '{ print $1, $2}')
_target=$(to_dev_name $1)
_new_fstype=$2
if [[ -z "$_target" || -z "$_new_fstype" ]];then
echo "Dump path $_path does not exist"
return 2
fi
fi
_record_block_drivers() {
local _drivers
if [[ -b /dev/block/$1 ]]; then
_drivers=$(udevadm info -a "/dev/block/$1" | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p')
fi
if [[ -b $1 ]]; then
_drivers=$(udevadm info -a "$1" | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p')
fi
for _driver in $_drivers; do
if ! [[ " $_target_drivers " == *" $_driver "* ]]; then
_target_drivers="$_target_drivers $_driver"
fi
done
return 1
}
check_block_and_slaves_all _record_block_drivers "$(get_maj_min "$_target")"
for _driver in $_target_drivers; do
# Older version of kmod util doesn't give module name, so follow Kbuild's
# name-fix rule and deduce the name.
_module_name=$(echo "$_driver" | sed "s/\(,\|-\)/_/g")
# Target is mounted already, if module is not included by current kernel,
# could be a deprecated/invalid driver name or builtin module
if ! (grep -q "\b$_module_name\b" /proc/modules); then
continue
fi
if ! [[ " $_old_drivers " == *" $_module_name "* ]]; then
echo "Detected change in block device driver, $_module_name is not included"
return 1
fi
done
if [[ $(expr substr $_new_fstype 1 3) = "nfs" ]];then
_new_dev=$_target
else
_new_dev=$(kdump_get_persistent_dev $_target $_new_fstype)
fi
if ! findmnt $_target >/dev/null; then
echo "Dump target $_target is probably not mounted."
return 2
fi
if [[ "$_target" = "$(get_root_fs_device)" ]]; then
_new_mntpoint="/sysroot"
else
_new_mntpoint="/kdumproot/$(get_mntpoint_from_target $_target)"
fi
_dracut_args=$(lsinitrd $TARGET_INITRD -f usr/lib/dracut/build-parameter.txt)
if [[ -z "$_dracut_args" ]];then
echo "Warning: No dracut arguments found in initrd"
return 0
fi
# if --mount argument present then match old and new target, mount
# point and file system. If any of them mismatches then rebuild
echo $_dracut_args | grep "\-\-mount" &> /dev/null
if [[ $? -eq 0 ]];then
set -- $(echo $_dracut_args | awk -F "--mount '" '{print $2}' | cut -d' ' -f1,2,3)
_old_dev=$1
_old_mntpoint=$2
_old_fstype=$3
[[ $_new_dev = $_old_dev && $_new_mntpoint = $_old_mntpoint && $_new_fstype = $_old_fstype ]] && return 0
# otherwise rebuild if target device is not a root device
else
[[ "$_target" = "$(get_root_fs_device)" ]] && return 0
fi
echo "Detected change in File System"
return 1
}
check_wdt_modified()
{
local -A _drivers
local _alldrivers _active _wdtdrv _wdtppath _dir
local wd_old wd_new
is_wdt_mod_omitted
[[ $? -eq 0 ]] && return 0
[[ -d /sys/class/watchdog/ ]] || return 0
# Copied logic from dracut 04watchdog/module-setup.sh::installkernel()
for _dir in /sys/class/watchdog/*; do
[[ -d "$_dir" ]] || continue
[[ -f "$_dir/state" ]] || continue
_active=$(< "$_dir/state")
[[ "$_active" = "active" ]] || continue
# device/modalias will return driver of this device
_wdtdrv=$(< "$_dir/device/modalias")
# There can be more than one module represented by same
# modalias. Currently load all of them.
# TODO: Need to find a way to avoid any unwanted module
# represented by modalias
_wdtdrv=$(modprobe --set-version "$kdump_kver" -R $_wdtdrv 2>/dev/null)
if [[ $_wdtdrv ]]; then
for i in $_wdtdrv; do
_drivers[$i]=1
done
fi
# however in some cases, we also need to check that if there is
# a specific driver for the parent bus/device. In such cases
# we also need to enable driver for parent bus/device.
_wdtppath=$(readlink -f "$_dir/device")
while [[ -d "$_wdtppath" ]] && [[ "$_wdtppath" != "/sys" ]]; do
_wdtppath=$(readlink -f "$_wdtppath/..")
[[ -f "$_wdtppath/modalias" ]] || continue
_wdtdrv=$(< "$_wdtppath/modalias")
_wdtdrv=$(modprobe --set-version "$kdump_kver" -R $_wdtdrv 2>/dev/null)
if [[ $_wdtdrv ]]; then
for i in $_wdtdrv; do
_drivers[$i]=1
done
fi
done
done
# ensure that watchdog module is loaded as early as possible
_alldrivers="${!_drivers[*]}"
[[ $_alldrivers ]] && wd_new="rd.driver.pre=${_alldrivers// /,}"
wd_old=$(lsinitrd $TARGET_INITRD -f etc/cmdline.d/00-watchdog.conf)
[[ "$wd_old" = "$wd_new" ]] && return 0
return 1
}
# returns 0 if system is not modified
# returns 1 if system is modified
# returns 2 if system modification is invalid
check_system_modified()
{
local ret
[[ -f $TARGET_INITRD ]] || return 1
check_files_modified
ret=$?
if [ $ret -ne 0 ]; then
return $ret
fi
check_dump_fs_modified
ret=$?
if [ $ret -ne 0 ]; then
return $ret
fi
check_wdt_modified
if [ $? -ne 0 ]; then
echo "Detected change in watchdog state"
return 1
fi
return 0
}
check_rebuild()
{
local extra_modules
local capture_capable_initrd="1"
local _force_rebuild force_rebuild="0"
local _force_no_rebuild force_no_rebuild="0"
local ret system_modified="0"
setup_initrd
if [ $? -ne 0 ]; then
return 1
fi
_force_no_rebuild=`grep ^force_no_rebuild $KDUMP_CONFIG_FILE 2>/dev/null`
if [ $? -eq 0 ]; then
force_no_rebuild=`echo $_force_no_rebuild | cut -d' ' -f2`
if [ "$force_no_rebuild" != "0" ] && [ "$force_no_rebuild" != "1" ];then
echo "Error: force_no_rebuild value is invalid"
return 1
fi
fi
_force_rebuild=`grep ^force_rebuild $KDUMP_CONFIG_FILE 2>/dev/null`
if [ $? -eq 0 ]; then
force_rebuild=`echo $_force_rebuild | cut -d' ' -f2`
if [ "$force_rebuild" != "0" ] && [ "$force_rebuild" != "1" ];then
echo "Error: force_rebuild value is invalid"
return 1
fi
fi
if [[ "$force_no_rebuild" == "1" && "$force_rebuild" == "1" ]]; then
echo "Error: force_rebuild and force_no_rebuild are enabled simultaneously in kdump.conf"
return 1
fi
# Will not rebuild kdump initrd
if [ "$force_no_rebuild" == "1" ]; then
return 0
fi
#will rebuild every time if extra_modules are specified
extra_modules=`grep ^extra_modules $KDUMP_CONFIG_FILE`
[ -n "$extra_modules" ] && force_rebuild="1"
#check to see if dependent files has been modified
#since last build of the image file
if [ -f $TARGET_INITRD ]; then
image_time=`stat -c "%Y" $TARGET_INITRD 2>/dev/null`
#in case of fadump mode, check whether the default/target
#initrd is already built with dump capture capability
if [ "$DEFAULT_DUMP_MODE" == "fadump" ]; then
capture_capable_initrd=$(lsinitrd -f $DRACUT_MODULES_FILE $TARGET_INITRD | grep ^kdumpbase$ | wc -l)
fi
fi
check_system_modified
ret=$?
if [ $ret -eq 2 ]; then
return 1
elif [ $ret -eq 1 ];then
system_modified="1"
fi
if [ $image_time -eq 0 ]; then
echo -n "No kdump initial ramdisk found."; echo
elif [ "$capture_capable_initrd" == "0" ]; then
echo -n "Rebuild $TARGET_INITRD with dump capture support"; echo
elif [ "$force_rebuild" != "0" ]; then
echo -n "Force rebuild $TARGET_INITRD"; echo
elif [ "$system_modified" != "0" ]; then
:
else
return 0
fi
echo "Rebuilding $TARGET_INITRD"
rebuild_initrd
return $?
}
# This function check iomem and determines if we have more than
# 4GB of ram available. Returns 1 if we do, 0 if we dont
need_64bit_headers()
{
return `tail -n 1 /proc/iomem | awk '{ split ($1, r, "-"); \
print (strtonum("0x" r[2]) > strtonum("0xffffffff")); }'`
}
# Load the kdump kernel specified in /etc/sysconfig/kdump
# If none is specified, try to load a kdump kernel with the same version
# as the currently running kernel.
load_kdump()
{
ARCH=`uname -m`
if [ "$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"
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="$KEXEC_ARGS --elf32-core-headers"
fi
fi
fi
prepare_cmdline
# For secureboot enabled machines, use new kexec file based syscall.
# Old syscall will always fail as it does not have capability to
# to kernel signature verification.
if is_secure_boot_enforced; then
echo "Secure Boot is enabled. Using kexec file based syscall."
KEXEC_ARGS="$KEXEC_ARGS -s"
elif is_secure_mode_enforced; then
echo "securelevel is set to 1 (Secure Mode). Using kexec file based syscall."
KEXEC_ARGS="$KEXEC_ARGS -s"
fi
$KEXEC $KEXEC_ARGS $standard_kexec_args \
--command-line="$KDUMP_COMMANDLINE" \
--initrd=$TARGET_INITRD $kdump_kernel
if [ $? == 0 ]; then
echo "kexec: loaded kdump kernel"
return 0
else
echo "kexec: failed to load kdump kernel" >&2
return 1
fi
}
check_ssh_config()
{
while read config_opt config_val; do
case "$config_opt" in
sshkey)
# remove inline comments after the end of a directive.
if [ -f "$config_val" ]; then
# canonicalize the path
SSH_KEY_LOCATION=$(/usr/bin/readlink -m $config_val)
else
echo "WARNING: '$config_val' doesn't exist, using default value '$SSH_KEY_LOCATION'"
fi
;;
path)
SAVE_PATH=$config_val
;;
ssh)
DUMP_TARGET=$config_val
;;
*)
;;
esac
done <<< "$(read_strip_comments $KDUMP_CONFIG_FILE)"
#make sure they've configured kdump.conf for ssh dumps
local SSH_TARGET=`echo -n $DUMP_TARGET | sed -n '/.*@/p'`
if [ -z "$SSH_TARGET" ]; then
return 1
fi
return 0
}
# ipv6 host address may takes a long time to be ready.
# Instead of checking against ipv6 address, we just check the network reachable
# by the return val of 'ssh'
check_and_wait_network_ready()
{
local start_time=$(date +%s)
local warn_once=1
local cur
local diff
local retval
local errmsg
while true; do
errmsg=$(ssh -i $SSH_KEY_LOCATION -o BatchMode=yes $DUMP_TARGET mkdir -p $SAVE_PATH 2>&1)
retval=$?
# ssh exits with the exit status of the remote command or with 255 if an error occurred
if [ $retval -eq 0 ]; then
return 0
elif [ $retval -ne 255 ]; then
echo "Could not create $DUMP_TARGET:$SAVE_PATH, you should check the privilege on server side" >&2
return 1
fi
# if server removes the authorized_keys or, no /root/.ssh/kdump_id_rsa
echo $errmsg | grep -q "Permission denied\|No such file or directory\|Host key verification failed"
if [ $? -eq 0 ]; then
echo "Could not create $DUMP_TARGET:$SAVE_PATH, you probably need to run \"kdumpctl propagate\"" >&2
return 1
fi
if [ $warn_once -eq 1 ]; then
echo "Network dump target is not usable, waiting for it to be ready"
warn_once=0
fi
echo -n .
cur=$(date +%s)
let "diff = $cur - $start_time"
# 60s time out
if [ $diff -gt 180 ]; then
break;
fi
sleep 1
done
echo "Could not create $DUMP_TARGET:$SAVE_PATH, ipaddr is not ready yet. You should check network connection" >&2
return 1
}
check_ssh_target()
{
check_and_wait_network_ready
if [ $? -ne 0 ]; then
return 1
fi
return 0
}
propagate_ssh_key()
{
check_ssh_config
if [ $? -ne 0 ]; then
echo "No ssh config specified in $KDUMP_CONFIG_FILE. Can't propagate" >&2
exit 1
fi
local KEYFILE=$SSH_KEY_LOCATION
local errmsg="Failed to propagate ssh key"
#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 $KEYFILE -N "" 2>&1 > /dev/null
echo "done."
fi
#now find the target ssh user and server to contact.
SSH_USER=`echo $DUMP_TARGET | cut -d\ -f2 | cut -d@ -f1`
SSH_SERVER=`echo $DUMP_TARGET | sed -e's/\(.*@\)\(.*$\)/\2/'`
#now send the found key to the found server
ssh-copy-id -i $KEYFILE $SSH_USER@$SSH_SERVER
RET=$?
if [ $RET == 0 ]; then
echo $KEYFILE has been added to ~$SSH_USER/.ssh/authorized_keys on $SSH_SERVER
return 0
else
echo $errmsg, $KEYFILE failed in transfer to $SSH_SERVER >&2
exit 1
fi
}
show_reserved_mem()
{
local mem=$(cat /sys/kernel/kexec_crash_size)
local mem_mb=$(expr $mem / 1024 / 1024)
echo "Reserved "$mem_mb"MB memory for crash kernel"
}
check_current_fadump_status()
{
# Check if firmware-assisted dump has been registered.
rc=`cat $FADUMP_REGISTER_SYS_NODE`
[ $rc -eq 1 ] && return 0
return 1
}
check_current_kdump_status()
{
rc=`cat /sys/kernel/kexec_crash_loaded`
if [ $rc == 1 ]; then
return 0
else
return 1
fi
}
check_current_status()
{
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
check_current_fadump_status
else
check_current_kdump_status
fi
return $?
}
save_raw()
{
local kdump_dir
local raw_target
raw_target=$(awk '$1 ~ /^raw$/ { print $2; }' $KDUMP_CONFIG_FILE)
[ -z "$raw_target" ] && return 0
[ -b "$raw_target" ] || {
echo "raw partition $raw_target not found"
return 1
}
kdump_dir=`grep ^path $KDUMP_CONFIG_FILE | cut -d' ' -f2-`
if [ -z "${kdump_dir}" ]; then
coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"
else
coredir="${kdump_dir}/`date +"%Y-%m-%d-%H:%M"`"
fi
mkdir -p "$coredir"
[ -d "$coredir" ] || {
echo "failed to create $coredir"
return 1
}
if makedumpfile -R $coredir/vmcore <$raw_target >/dev/null 2>&1; then
# dump found
echo "Dump saved to $coredir/vmcore"
# wipe makedumpfile header
dd if=/dev/zero of=$raw_target bs=1b count=1 2>/dev/null
else
rm -rf "$coredir"
fi
return 0
}
is_dump_target_configured()
{
local _target
_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix|^raw|^ssh|^nfs" /etc/kdump.conf)
[ -n "$_target" ]
}
local_fs_dump_target()
{
local _target
_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix" /etc/kdump.conf)
if [ $? -eq 0 ]; then
echo $_target|awk '{print $2}'
fi
}
path_to_be_relabeled()
{
local _path _target _mnt="/" _rmnt
if is_dump_target_configured; then
_target=$(local_fs_dump_target)
if [[ -n "$_target" ]]; then
_mnt=$(findmnt -k -f -n -r -o TARGET $_target)
if [ -z "$_mnt" ]; then
return
fi
else
return
fi
fi
if is_mount_in_dracut_args; then
return;
fi
_path=$(get_save_path)
# if $_path is masked by other mount, we will not relabel it.
_rmnt=$(df $_mnt/$_path 2>/dev/null | tail -1 | awk '{ print $NF }')
if [ "$_rmnt" == "$_mnt" ]; then
echo $_mnt/$_path
fi
}
selinux_relabel()
{
local _path _i _attr
_path=$(path_to_be_relabeled)
if [ -z "$_path" ] || ! [ -d "$_path" ] ; then
return
fi
for _i in $(find $_path); do
_attr=$(getfattr -m "security.selinux" $_i 2>/dev/null)
if [ -z "$_attr" ]; then
restorecon $_i;
fi
done
}
# Check if secure boot is being enforced.
#
# Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and
# SetupMode-$(the UUID), they are both 5 bytes binary data. The first four
# bytes are the attributes associated with the variable and can safely be
# ignored, the last bytes are one-byte true-or-false variables. If SecureBoot
# is 1 and SetupMode is 0, then secure boot is being enforced.
#
# SecureBoot-UUID won't always be set when securelevel is 1. For legacy-mode
# and uefi-without-seucre-enabled system, we can manually enable secure mode
# by writing "1" to securelevel. So check both efi var and secure mode is a
# more sane way.
#
# Assume efivars is mounted at /sys/firmware/efi/efivars.
is_secure_boot_enforced()
{
local secure_boot_file setup_mode_file
local secure_boot_byte setup_mode_byte
secure_boot_file=$(find /sys/firmware/efi/efivars -name SecureBoot-* 2>/dev/null)
setup_mode_file=$(find /sys/firmware/efi/efivars -name SetupMode-* 2>/dev/null)
if [ -f "$secure_boot_file" ] && [ -f "$setup_mode_file" ]; then
secure_boot_byte=$(hexdump -v -e '/1 "%d\ "' $secure_boot_file|cut -d' ' -f 5)
setup_mode_byte=$(hexdump -v -e '/1 "%d\ "' $setup_mode_file|cut -d' ' -f 5)
if [ "$secure_boot_byte" = "1" ] && [ "$setup_mode_byte" = "0" ]; then
return 0
fi
fi
return 1
}
# Check if secure mode is being enforced (securelevel =? 1)
is_secure_mode_enforced()
{
local secure_mode_byte
if [ ! -f /sys/kernel/security/securelevel ]; then
return 1
fi
secure_mode_byte=$(cat /sys/kernel/security/securelevel)
if [ "$secure_mode_byte" = "1" ]; then
return 0
fi
return 1
}
check_crash_mem_reserved()
{
local mem_reserved
mem_reserved=$(cat /sys/kernel/kexec_crash_size)
if [ $mem_reserved -eq 0 ]; then
echo "No memory reserved for crash kernel"
return 1
fi
return 0
}
check_kdump_feasibility()
{
if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
echo "Kdump is not supported on this kernel"
return 1
fi
check_crash_mem_reserved
return $?
}
check_fence_kdump_config()
{
local hostname=`hostname`
local ipaddrs=`hostname -I`
local nodes=$(get_option_value "fence_kdump_nodes")
for node in $nodes; do
if [ "$node" = "$hostname" ]; then
echo "Option fence_kdump_nodes cannot contain $hostname"
return 1
fi
# node can be ipaddr
echo "$ipaddrs " | grep "$node " > /dev/null
if [ $? -eq 0 ]; then
echo "Option fence_kdump_nodes cannot contain $node"
return 1
fi
done
return 0
}
check_dump_feasibility()
{
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
return 0
fi
check_kdump_feasibility
return $?
}
start_fadump()
{
echo 1 > $FADUMP_REGISTER_SYS_NODE
if ! check_current_fadump_status; then
echo "fadump: failed to register"
return 1
fi
echo "fadump: registered successfully"
return 0
}
start_dump()
{
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
start_fadump
else
load_kdump
fi
return $?
}
check_default_config()
{
local default_option
default_option=$(awk '$1 ~ /^default$/ {print $2;}' $KDUMP_CONFIG_FILE)
if [ -z "$default_option" ]; then
return 0
else
case "$default_option" in
reboot|halt|poweroff|shell|dump_to_rootfs)
return 0
;;
*)
echo $"Usage kdump.conf: default {reboot|halt|poweroff|shell|dump_to_rootfs}"
return 1
esac
fi
}
start()
{
check_dump_feasibility
if [ $? -ne 0 ]; then
echo "Starting kdump: [FAILED]"
return 1
fi
check_config
if [ $? -ne 0 ]; then
echo "Starting kdump: [FAILED]"
return 1
fi
if sestatus 2>/dev/null | grep -q "SELinux status.*enabled"; then
selinux_relabel
fi
save_raw
if [ $? -ne 0 ]; then
echo "Starting kdump: [FAILED]"
return 1
fi
check_current_status
if [ $? == 0 ]; then
echo "Kdump already running: [WARNING]"
return 0
fi
if check_ssh_config; then
if ! check_ssh_target; then
echo "Starting kdump: [FAILED]"
return 1
fi
fi
check_rebuild
if [ $? != 0 ]; then
echo "Starting kdump: [FAILED]"
return 1
fi
start_dump
if [ $? != 0 ]; then
echo "Starting kdump: [FAILED]"
return 1
fi
echo "Starting kdump: [OK]"
}
reload()
{
check_current_status
if [ $? -ne 0 ]; then
echo "Kdump is not running: [WARNING]"
return 0
fi
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
reload_fadump
return $?
else
stop_kdump
fi
if [ $? -ne 0 ]; then
echo "Stopping kdump: [FAILED]"
return 1
fi
echo "Stopping kdump: [OK]"
setup_initrd
if [ $? -ne 0 ]; then
echo "Starting kdump: [FAILED]"
return 1
fi
start_dump
if [ $? -ne 0 ]; then
echo "Starting kdump: [FAILED]"
return 1
fi
echo "Starting kdump: [OK]"
}
stop_fadump()
{
echo 0 > $FADUMP_REGISTER_SYS_NODE
if check_current_fadump_status; then
echo "fadump: failed to unregister"
return 1
fi
echo "fadump: unregistered successfully"
return 0
}
stop_kdump()
{
if is_secure_boot_enforced; then
$KEXEC -s -p -u
else
$KEXEC -p -u
fi
if [ $? != 0 ]; then
echo "kexec: failed to unload kdump kernel"
return 1
fi
echo "kexec: unloaded kdump kernel"
return 0
}
reload_fadump()
{
echo 1 > $FADUMP_REGISTER_SYS_NODE
if [ $? == 0 ]; then
echo "fadump: re-registered successfully"
return 0
else
# FADump could fail on older kernel where re-register
# support is not enabled. Try stop/start from userspace
# to handle such scenario.
stop_fadump
if [ $? == 0 ]; then
start_fadump
return $?
fi
fi
return 1
}
stop()
{
if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
stop_fadump
else
stop_kdump
fi
if [ $? != 0 ]; then
echo "Stopping kdump: [FAILED]"
return 1
fi
echo "Stopping kdump: [OK]"
return 0
}
rebuild() {
check_config
if [ $? -ne 0 ]; then
return 1
fi
if check_ssh_config; then
if ! check_ssh_target; then
return 1
fi
fi
setup_initrd
if [ $? -ne 0 ]; then
return 1
fi
echo "Rebuilding $TARGET_INITRD"
rebuild_initrd
return $?
}
if [ ! -f "$KDUMP_CONFIG_FILE" ]; then
echo "Error: No kdump config file found!" >&2
exit 1
fi
main ()
{
# Determine if the dump mode is kdump or fadump
determine_dump_mode
case "$1" in
start)
if [ -s /proc/vmcore ]; then
save_core
reboot
else
start
fi
;;
stop)
stop
;;
status)
EXIT_CODE=0
check_current_status
case "$?" in
0)
echo "Kdump is operational"
EXIT_CODE=0
;;
1)
echo "Kdump is not operational"
EXIT_CODE=3
;;
esac
exit $EXIT_CODE
;;
reload)
reload
;;
restart)
stop
start
;;
rebuild)
rebuild
;;
condrestart)
;;
propagate)
propagate_ssh_key
;;
showmem)
show_reserved_mem
;;
*)
echo $"Usage: $0 {start|stop|status|restart|reload|rebuild|propagate|showmem}"
exit 1
esac
}
# Other kdumpctl instances will block in queue, until this one exits
single_instance_lock
# To avoid fd 9 leaking, we invoke a subshell, close fd 9 and call main.
# So that fd isn't leaking when main is invoking a subshell.
(exec 9<&-; main $1)
exit $?