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Linux unitednationsplay.com 3.10.0-1160.45.1.el7.x86_64 #1 SMP Wed Oct 13 17:20:51 UTC 2021 x86_64
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Name	Size	Permission	Date	Action
mysql-flush.sh.sample	1.73 KB	-rw-r--r--	2018-04-24 16:30

Rename

#!/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