| Current File : //usr/bin/galera_recovery |
#!/bin/sh
# Copyright (c) 2016 MariaDB Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
# This script is intended to be executed by systemd. It starts mysqld with
# --wsrep-recover to recover from a non-graceful shutdown, determines the
# last stored global transaction ID and echoes it in --wsrep-start-position=XX
# format. The output is then captured and used by systemd to start mysqld.
# If the server was configured to start without wsrep, nothing is echoed.
cmdline_args=$@
user="mysql"
print_defaults="/usr/bin/my_print_defaults"
log_file=$(mktemp /tmp/wsrep_recovery.XXXXXX)
euid=$(id -u)
recovered_pos=""
skipped=""
start_pos=""
start_pos_opt=""
ret=0
wsrep_on=0
log ()
{
local msg="$1"
# Print all messages to stderr as we reserve stdout for printing
# --wsrep-start-position=XXXX.
echo "$msg" >&2
}
finish()
{
rm -f "$log_file"
}
trap finish EXIT
parse_arguments() {
for arg do
val=`echo "$arg" | sed -e "s;--[^=]*=;;"`
case "$arg" in
--wsrep[-_]on) wsrep_on=1 ;;
--skip[-_]wsrep[-_]on) wsrep_on=0 ;;
--wsrep[-_]on=*)
if echo $val | grep -iq '\(ON\|1\)'; then
wsrep_on=1
else
wsrep_on=0
fi
;;
esac
done
}
wsrep_recover_position() {
# Redirect server's error log to the log file.
eval /usr/sbin/mysqld $cmdline_args --user=$user --wsrep_recover \
--disable-log-error 2> "$log_file"
ret=$?
if [ $ret -ne 0 ]; then
# Something went wrong, let us also print the error log so that it
# shows up in systemctl status output as a hint to the user.
log "WSREP: Failed to start mysqld for wsrep recovery: '`cat $log_file`'"
exit 1
fi
# Parse server's error log for recovered position. The server prints
# "..skipping position recovery.." if started without wsrep.
recovered_pos="$(grep 'WSREP: Recovered position:' $log_file)"
if [ -z "$recovered_pos" ]; then
skipped="$(grep WSREP $log_file | grep 'skipping position recovery')"
if [ -z "$skipped" ]; then
log "WSREP: Failed to recover position: '`cat $log_file`'"
exit 1
else
log "WSREP: Position recovery skipped."
fi
else
start_pos="$(echo $recovered_pos | sed 's/.*WSREP\:\ Recovered\ position://' \
| sed 's/^[ \t]*//')"
log "WSREP: Recovered position $start_pos"
start_pos_opt="--wsrep_start_position=$start_pos"
fi
}
# Safety checks
if [ -n "$log_file" -a -f "$log_file" ]; then
chmod 600 $log_file
else
log "WSREP: mktemp failed"
fi
parse_arguments `$print_defaults $cmdline_args --loose-verbose --mysqld`
# Perform wsrep position recovery if wsrep_on=1, skip otherwise.
if [ "$wsrep_on" -eq 1 ]; then
wsrep_recover_position
fi
echo "$start_pos_opt"