96610da210
Adds sample hook scripts for --fsfreeze-hook option of qemu-ga. - fsfreeze-hook : execute scripts in fsfreeze-hook.d/ - fsfreeze-hook.d/mysql-flush.sh.sample : quiesce MySQL before snapshot Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama.qu@hitachi.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
57 lines
1.7 KiB
Bash
Executable file
57 lines
1.7 KiB
Bash
Executable file
#!/bin/sh
|
|
|
|
# Flush MySQL tables to the disk before the filesystem is frozen.
|
|
# At the same time, this keeps a read lock in order to avoid write accesses
|
|
# from the other clients until the filesystem is thawed.
|
|
|
|
MYSQL="/usr/bin/mysql"
|
|
MYSQL_OPTS="-uroot" #"-prootpassword"
|
|
FIFO=/var/run/mysql-flush.fifo
|
|
|
|
# Check mysql is installed and the server running
|
|
[ -x "$MYSQL" ] && "$MYSQL" $MYSQL_OPTS < /dev/null || exit 0
|
|
|
|
flush_and_wait() {
|
|
printf "FLUSH TABLES WITH READ LOCK \\G\n"
|
|
trap 'printf "$(date): $0 is killed\n">&2' HUP INT QUIT ALRM TERM
|
|
read < $FIFO
|
|
printf "UNLOCK TABLES \\G\n"
|
|
rm -f $FIFO
|
|
}
|
|
|
|
case "$1" in
|
|
freeze)
|
|
mkfifo $FIFO || exit 1
|
|
flush_and_wait | "$MYSQL" $MYSQL_OPTS &
|
|
# wait until every block is flushed
|
|
while [ "$(echo 'SHOW STATUS LIKE "Key_blocks_not_flushed"' |\
|
|
"$MYSQL" $MYSQL_OPTS | tail -1 | cut -f 2)" -gt 0 ]; do
|
|
sleep 1
|
|
done
|
|
# for InnoDB, wait until every log is flushed
|
|
INNODB_STATUS=$(mktemp /tmp/mysql-flush.XXXXXX)
|
|
[ $? -ne 0 ] && exit 2
|
|
trap "rm -f $INNODB_STATUS; exit 1" HUP INT QUIT ALRM TERM
|
|
while :; do
|
|
printf "SHOW ENGINE INNODB STATUS \\G" |\
|
|
"$MYSQL" $MYSQL_OPTS > $INNODB_STATUS
|
|
LOG_CURRENT=$(grep 'Log sequence number' $INNODB_STATUS |\
|
|
tr -s ' ' | cut -d' ' -f4)
|
|
LOG_FLUSHED=$(grep 'Log flushed up to' $INNODB_STATUS |\
|
|
tr -s ' ' | cut -d' ' -f5)
|
|
[ "$LOG_CURRENT" = "$LOG_FLUSHED" ] && break
|
|
sleep 1
|
|
done
|
|
rm -f $INNODB_STATUS
|
|
;;
|
|
|
|
thaw)
|
|
[ ! -p $FIFO ] && exit 1
|
|
echo > $FIFO
|
|
;;
|
|
|
|
*)
|
|
exit 1
|
|
;;
|
|
esac
|