Am 03.11.14 09:39, schrieb Eric Blake: > On 11/02/2014 02:13 PM, Thomas Stein wrote: > >> After a little bit of fiddling i've got this running. Here is what's >> neccessary in case someone wanna try this too. > > That's awesome news! Thanks for sharing. > > >> https://github.com/qemu/qemu/blob/master/scripts/qemu-guest-agent/fsfreeze-hook.d/mysql-flush.sh.sample >> >> I had to adjust this script a little for mariadb 10.0.14. But after that >> everything works as expected. > > Do you want to post your version of the script for others to learn from? Sure. Here we go: ---- #!/bin/bash -x # Flush MySQL tables to the disk before the filesystem is freezed. # At the same time, this keeps a read lock while the filesystem is freezed # in order to avoid write accesses by the other clients. MYSQL="mysql -uroot -ppassword" FIFO=/tmp/mysql-flush.fifo flush_and_wait() { printf "FLUSH TABLES WITH READ LOCK \\G\n" read < $FIFO printf "UNLOCK TABLES \\G\n" } case "$1" in freeze) mkfifo $FIFO || exit 1 flush_and_wait | $MYSQL & # wait until every block is flushed while [ "$(echo 'SHOW STATUS LIKE "Key_blocks_not_flushed"' |\ $MYSQL | tail -1 | cut -f 2)" -gt 0 ]; do sleep 1 done # for InnoDB, wait until every log is flushed INNODB_STATUS=$(mktemp /tmp/mysql-flush.XXXXXX) [ $? -ne 0 ] && exit 2 trap "rm -f $INNODB_STATUS" SIGINT while :; do printf "SHOW ENGINE INNODB STATUS \\G" | $MYSQL > $INNODB_STATUS LOG_CURRENT=$(grep 'Log sequence number' $INNODB_STATUS tr -s ' ' | cut -d' ' -f4) LOG_FLUSHED=$(grep 'Log flushed up to' $INNODB_STATUS tr -s ' ' | cut -d' ' -f7) [ "$LOG_CURRENT" = "$LOG_FLUSHED" ] && break sleep 1 done rm -f $INNODB_STATUS ;; thaw) [ ! -p $FIFO ] && exit 1 echo > $FIFO rm -f $FIFO ;; esac ---- cheers t. _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
