3b743ae6ae
Since the logger was introduced into kdump, let's enable it for kdump so that we can output kdump messages according the log level and save these messages for debugging. Signed-off-by: Lianbo Jiang <lijiang@redhat.com> Acked-by: Kairui Song <kasong@redhat.com>
497 lines
13 KiB
Bash
497 lines
13 KiB
Bash
#!/bin/bash --norc
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# New mkdumprd
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#
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# Copyright 2011 Red Hat, Inc.
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#
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# Written by Cong Wang <amwang@redhat.com>
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#
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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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[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
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. $dracutbasedir/dracut-functions.sh
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. /lib/kdump/kdump-lib.sh
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export IN_KDUMP=1
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#initiate the kdump logger
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dlog_init
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if [ $? -ne 0 ]; then
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echo "failed to initiate the kdump logger."
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exit 1
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fi
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conf_file="/etc/kdump.conf"
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SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
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SAVE_PATH=$(get_save_path)
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OVERRIDE_RESETTABLE=0
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extra_modules=""
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dracut_args="--quiet --hostonly --hostonly-cmdline --hostonly-i18n --hostonly-mode strict -o \"plymouth dash resume ifcfg earlykdump\""
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readonly MKDUMPRD_TMPDIR="$(mktemp -d -t mkdumprd.XXXXXX)"
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[ -d "$MKDUMPRD_TMPDIR" ] || perror_exit "dracut: mktemp -p -d -t dracut.XXXXXX failed."
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readonly MKDUMPRD_TMPMNT="$MKDUMPRD_TMPDIR/target"
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trap '
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ret=$?;
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is_mounted $MKDUMPRD_TMPMNT && umount -f $MKDUMPRD_TMPMNT;
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[[ -d $MKDUMPRD_TMPDIR ]] && rm --one-file-system -rf -- "$MKDUMPRD_TMPDIR";
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exit $ret;
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' EXIT
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# clean up after ourselves no matter how we die.
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trap 'exit 1;' SIGINT
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is_wdt_addition_needed() {
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local active
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is_wdt_mod_omitted
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[[ $? -eq 0 ]] && return 1
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[[ -d /sys/class/watchdog/ ]] || return 1
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for dir in /sys/class/watchdog/*; do
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[[ -f "$dir/state" ]] || continue
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active=$(< "$dir/state")
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[[ "$active" = "active" ]] && return 0
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done
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return 1
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}
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add_dracut_arg() {
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dracut_args="$dracut_args $@"
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}
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add_dracut_module() {
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add_dracut_arg "--add" "\"$1\""
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}
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add_dracut_mount() {
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add_dracut_arg "--mount" "\"$1\""
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}
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add_dracut_sshkey() {
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add_dracut_arg "--sshkey" "\"$1\""
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}
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# caller should ensure $1 is valid and mounted in 1st kernel
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to_mount() {
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local _target=$1 _fstype=$2 _options=$3 _new_mntpoint _pdev
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_new_mntpoint=$(get_kdump_mntpoint_from_target $_target)
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_fstype="${_fstype:-$(get_fs_type_from_target $_target)}"
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_options="${_options:-$(get_mntopt_from_target $_target)}"
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_options="${_options:-defaults}"
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if [[ "$_fstype" == "nfs"* ]]; then
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_pdev=$_target
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_options=$(echo $_options | sed 's/,addr=[^,]*//')
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_options=$(echo $_options | sed 's/,proto=[^,]*//')
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_options=$(echo $_options | sed 's/,clientaddr=[^,]*//')
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else
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# for non-nfs _target converting to use udev persistent name
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_pdev="$(kdump_get_persistent_dev $_target)"
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if [ -z "$_pdev" ]; then
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return 1
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fi
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fi
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# mount fs target as rw in 2nd kernel
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_options=$(echo $_options | sed 's/\(^\|,\)ro\($\|,\)/\1rw\2/g')
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# with 'noauto' in fstab nfs and non-root disk mount will fail in 2nd
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# kernel, filter it out here.
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_options=$(echo $_options | sed 's/\(^\|,\)noauto\($\|,\)/\1/g')
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# drop nofail or nobootwait
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_options=$(echo $_options | sed 's/\(^\|,\)nofail\($\|,\)/\1/g')
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_options=$(echo $_options | sed 's/\(^\|,\)nobootwait\($\|,\)/\1/g')
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# use both nofail and x-systemd.before to ensure systemd will try best to
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# mount it before kdump starts, this is an attempt to improve robustness
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_options="$_options,nofail,x-systemd.before=initrd-fs.target"
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echo "$_pdev $_new_mntpoint $_fstype $_options"
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}
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#Function: get_ssh_size
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#$1=dump target
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#called from while loop and shouldn't read from stdin, so we're using "ssh -n"
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get_ssh_size() {
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local _opt _out _size
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_opt="-i $SSH_KEY_LOCATION -o BatchMode=yes -o StrictHostKeyChecking=yes"
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_out=$(ssh -q -n $_opt $1 "df -P $SAVE_PATH")
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[ $? -ne 0 ] && {
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perror_exit "checking remote ssh server available size failed."
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}
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#ssh output removed the line break, so print field NF-2
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_size=$(echo -n $_out| awk '{avail=NF-2; print $avail}')
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echo -n $_size
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}
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#mkdir if save path does not exist on ssh dump target
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#$1=ssh dump target
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#caller should ensure write permission on $1:$SAVE_PATH
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#called from while loop and shouldn't read from stdin, so we're using "ssh -n"
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mkdir_save_path_ssh()
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{
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local _opt _dir
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_opt="-i $SSH_KEY_LOCATION -o BatchMode=yes -o StrictHostKeyChecking=yes"
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ssh -qn $_opt $1 mkdir -p $SAVE_PATH 2>&1 > /dev/null
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_ret=$?
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if [ $_ret -ne 0 ]; then
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perror_exit "mkdir failed on $1:$SAVE_PATH"
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fi
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#check whether user has write permission on $1:$SAVE_PATH
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_dir=$(ssh -qn $_opt $1 mktemp -dqp $SAVE_PATH 2>/dev/null)
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_ret=$?
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if [ $_ret -ne 0 ]; then
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perror_exit "Could not create temporary directory on $1:$SAVE_PATH. Make sure user has write permission on destination"
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fi
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ssh -qn $_opt $1 rmdir $_dir
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return 0
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}
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#Function: get_fs_size
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#$1=dump target
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get_fs_size() {
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local _mnt=$(get_mntpoint_from_target $1)
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echo -n $(df -P "${_mnt}/$SAVE_PATH"|tail -1|awk '{print $4}')
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}
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#Function: get_raw_size
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#$1=dump target
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get_raw_size() {
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echo -n $(fdisk -s "$1")
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}
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#Function: check_size
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#$1: dump type string ('raw', 'fs', 'ssh')
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#$2: dump target
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check_size() {
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local avail memtotal
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memtotal=$(awk '/MemTotal/{print $2}' /proc/meminfo)
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case "$1" in
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raw)
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avail=$(get_raw_size "$2")
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;;
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ssh)
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avail=$(get_ssh_size "$2")
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;;
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fs)
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avail=$(get_fs_size "$2")
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;;
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*)
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return
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esac
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if [ $? -ne 0 ]; then
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perror_exit "Check dump target size failed"
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fi
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if [ $avail -lt $memtotal ]; then
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dwarn "Warning: There might not be enough space to save a vmcore."
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dwarn " The size of $2 should be greater than $memtotal kilo bytes."
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fi
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}
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check_save_path_fs()
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{
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local _path=$1
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if [ ! -d $_path ]; then
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perror_exit "Dump path $_path does not exist."
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fi
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}
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check_user_configured_target()
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{
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local _target=$1 _cfg_fs_type=$2 _mounted
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local _mnt=$(get_mntpoint_from_target $_target)
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local _opt=$(get_mntopt_from_target $_target)
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local _fstype=$(get_fs_type_from_target $_target)
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if [ -n "$_fstype" ]; then
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# In case of nfs4, nfs should be used instead, nfs* options is deprecated in kdump.conf
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[[ $_fstype = "nfs"* ]] && _fstype=nfs
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if [ -n "$_cfg_fs_type" ] && [ "$_fstype" != "$_cfg_fs_type" ]; then
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perror_exit "\"$_target\" have a wrong type config \"$_cfg_fs_type\", expected \"$_fstype\""
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fi
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else
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_fstype="$_cfg_fs_type"
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_fstype="$_cfg_fs_type"
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fi
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# For noauto mount, mount it inplace with default value.
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# Else use the temporary target directory
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if [ -n "$_mnt" ]; then
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if ! is_mounted "$_mnt"; then
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if [[ $_opt = *",noauto"* ]]; then
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mount $_mnt
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[ $? -ne 0 ] && perror_exit "Failed to mount $_target on $_mnt for kdump preflight check."
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_mounted=$_mnt
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else
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perror_exit "Dump target \"$_target\" is neither mounted nor configured as \"noauto\""
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fi
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fi
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else
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_mnt=$MKDUMPRD_TMPMNT
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mkdir -p $_mnt
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mount $_target $_mnt -t $_fstype -o defaults
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[ $? -ne 0 ] && perror_exit "Failed to mount $_target for kdump preflight check."
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_mounted=$_mnt
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fi
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# For user configured target, use $SAVE_PATH as the dump path within the target
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if [ ! -d "$_mnt/$SAVE_PATH" ]; then
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perror_exit "Dump path \"$SAVE_PATH\" does not exist in dump target \"$_target\""
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fi
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check_size fs "$_target"
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# Unmount it early, if function is interrupted and didn't reach here, the shell trap will clear it up anyway
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if [ -n "$_mounted" ]; then
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umount -f -- $_mounted
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fi
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}
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# $1: core_collector config value
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verify_core_collector() {
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local _cmd="${1%% *}"
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local _params="${1#* }"
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if [ "$_cmd" != "makedumpfile" ]; then
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if is_raw_dump_target; then
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dwarn "Warning: specifying a non-makedumpfile core collector, you will have to recover the vmcore manually."
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fi
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return
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fi
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if is_ssh_dump_target || is_raw_dump_target; then
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if ! strstr "$_params" "-F"; then
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perror_exit "The specified dump target needs makedumpfile \"-F\" option."
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fi
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_params="$_params vmcore"
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else
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_params="$_params vmcore dumpfile"
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fi
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if ! $_cmd --check-params $_params; then
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perror_exit "makedumpfile parameter check failed."
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fi
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}
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add_mount() {
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local _mnt=$(to_mount $@)
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if [ $? -ne 0 ]; then
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exit 1
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fi
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add_dracut_mount "$_mnt"
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}
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#handle the case user does not specify the dump target explicitly
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handle_default_dump_target()
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{
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local _target
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local _mntpoint
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is_user_configured_dump_target && return
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check_save_path_fs $SAVE_PATH
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_save_path=$(get_bind_mount_source $SAVE_PATH)
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_target=$(get_target_from_path $_save_path)
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_mntpoint=$(get_mntpoint_from_target $_target)
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SAVE_PATH=${_save_path##"$_mntpoint"}
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add_mount "$_target"
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check_size fs $_target
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}
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get_override_resettable()
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{
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local override_resettable
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override_resettable=$(grep "^override_resettable" $conf_file)
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if [ -n "$override_resettable" ]; then
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OVERRIDE_RESETTABLE=$(echo $override_resettable | cut -d' ' -f2)
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if [ "$OVERRIDE_RESETTABLE" != "0" ] && [ "$OVERRIDE_RESETTABLE" != "1" ];then
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perror_exit "override_resettable value $OVERRIDE_RESETTABLE is invalid"
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fi
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fi
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}
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# $1: function name
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for_each_block_target()
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{
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local dev majmin
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for dev in $(get_kdump_targets); do
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[ -b "$dev" ] || continue
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majmin=$(get_maj_min $dev)
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check_block_and_slaves $1 $majmin && return 1
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done
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return 0
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}
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#judge if a specific device with $1 is unresettable
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#return false if unresettable.
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is_unresettable()
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{
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local path="/sys/$(udevadm info --query=all --path=/sys/dev/block/$1 | awk '/^P:/ {print $2}' | sed -e 's/\(cciss[0-9]\+\/\).*/\1/g' -e 's/\/block\/.*$//')/resettable"
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local resettable=1
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if [ -f "$path" ]
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then
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resettable="$(cat $path)"
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[ $resettable -eq 0 -a "$OVERRIDE_RESETTABLE" -eq 0 ] && {
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local device=$(udevadm info --query=all --path=/sys/dev/block/$1 | awk -F= '/DEVNAME/{print $2}')
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derror "Error: Can not save vmcore because device $device is unresettable"
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return 0
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}
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fi
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return 1
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}
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#check if machine is resettable.
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#return true if resettable
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check_resettable()
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{
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local _ret _target
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get_override_resettable
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for_each_block_target is_unresettable
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_ret=$?
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[ $_ret -eq 0 ] && return
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return 1
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}
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# $1: maj:min
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is_crypt()
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{
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local majmin=$1 dev line ID_FS_TYPE=""
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line=$(udevadm info --query=property --path=/sys/dev/block/$majmin \
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| grep "^ID_FS_TYPE")
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eval "$line"
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[[ "$ID_FS_TYPE" = "crypto_LUKS" ]] && {
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dev=$(udevadm info --query=all --path=/sys/dev/block/$majmin | awk -F= '/DEVNAME/{print $2}')
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derror "Device $dev is encrypted."
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return 0
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}
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return 1
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}
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check_crypt()
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{
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local _ret _target
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for_each_block_target is_crypt
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_ret=$?
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[ $_ret -eq 0 ] && return
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return 1
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}
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if ! check_resettable; then
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exit 1
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fi
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if ! check_crypt; then
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dwarn "Warning: Encrypted device is in dump path, which is not recommended, see kexec-kdump-howto.txt for more details."
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fi
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# firstly get right SSH_KEY_LOCATION
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keyfile=$(awk '/^sshkey/ {print $2}' $conf_file)
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if [ -f "$keyfile" ]; then
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# canonicalize the path
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SSH_KEY_LOCATION=$(/usr/bin/readlink -m $keyfile)
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fi
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if [ "$(uname -m)" = "s390x" ]; then
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add_dracut_module "znet"
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fi
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if is_wdt_addition_needed; then
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add_dracut_arg "-a" "watchdog"
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fi
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while read config_opt config_val;
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do
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# remove inline comments after the end of a directive.
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case "$config_opt" in
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extra_modules)
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extra_modules="$extra_modules $config_val"
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;;
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ext[234]|xfs|btrfs|minix|nfs)
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check_user_configured_target "$config_val" "$config_opt"
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add_mount "$config_val" "$config_opt"
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;;
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raw)
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# checking raw disk writable
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dd if=$config_val count=1 of=/dev/null > /dev/null 2>&1 || {
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perror_exit "Bad raw disk $config_val"
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}
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_praw=$(persistent_policy="by-id" kdump_get_persistent_dev $config_val)
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if [ -z "$_praw" ]; then
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exit 1
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fi
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add_dracut_arg "--device" "$_praw"
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check_size raw $config_val
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;;
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ssh)
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if strstr "$config_val" "@";
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then
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mkdir_save_path_ssh $config_val
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check_size ssh $config_val
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add_dracut_module "ssh-client"
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add_dracut_sshkey "$SSH_KEY_LOCATION"
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else
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perror_exit "Bad ssh dump target $config_val"
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fi
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;;
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core_collector)
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verify_core_collector "$config_val"
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;;
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dracut_args)
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add_dracut_arg $config_val
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;;
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*)
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;;
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esac
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done <<< "$(read_strip_comments $conf_file)"
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handle_default_dump_target
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if [ -n "$extra_modules" ]
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then
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add_dracut_arg "--add-drivers" \"$extra_modules\"
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fi
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if ! is_fadump_capable; then
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# The 2nd rootfs mount stays behind the normal dump target mount,
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# so it doesn't affect the logic of check_dump_fs_modified().
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is_dump_to_rootfs && add_mount "$(to_dev_name $(get_root_fs_device))"
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add_dracut_arg "--no-hostonly-default-device"
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fi
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echo "$dracut_args $@" | xargs dracut
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_rc=$?
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sync
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exit $_rc
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