#!/bin/bash
# Shell script to backup MySql database
# To backup Mysql databases file to /backup dir and later pick up by your
# script. You can skip few databases from backup too.
MyUSER="root"     # USERNAME
MyPASS="fI78SbTWjzgc" # PASSWORD
MyHOST="localhost"          # Hostname

# Linux bin paths, change this if it can't be autodetected via which command
MYSQL="$(which mysql)"
MYSQLDUMP="$(which mysqldump)"
CHOWN="$(which chown)"
CHMOD="$(which chmod)"
GZIP="$(which gzip)"
# Backup Dest directory, change this if you have someother location
DEST="/home/backups/mysql"

# Main directory where backup will be stored
MBD="$DEST"

# Get hostname
HOST="$(hostname)"

# Get data in dd-mm-yyyy format
NOW="$(date +"%Y%m%d")"

echo $NOW: Starting MySQL backup on $HOST
echo Backup location: $DEST

# File to store current backup file
FILE="databasedump"
# Store list of databases
DBS=""

# DO NOT BACKUP these databases
IGGY="information_schema sys performance_schema mysql"

[ ! -d $MBD ] && mkdir -p $MBD || :

# Get all database list first
DBS="$($MYSQL -u $MyUSER -h $MyHOST -p$MyPASS -Bse 'show databases')"
echo Databases to backup:
echo $DBS


declare -i RESULT
RESULT=0
declare -i THISRESULT
THISRESULT=0

for db in $DBS
do
    skipdb=-1
    if [ "$IGGY" != "" ];
    then
        for i in $IGGY
        do
            [ "$db" == "$i" ] && skipdb=1 || :
        done
    fi

    if [ "$skipdb" == "-1" ] ; then
        FILE="$MBD/$db.$HOST.$NOW.gz"
        touch $FILE
        chown root.root $FILE
        chmod 0600 $FILE
        # do all inone job in pipe,
        # connect to mysql using mysqldump for select mysql database
        # and pipe it out to gz file in backup dir :)
        $MYSQLDUMP --set-gtid-purged=OFF --single-transaction --routines -u $MyUSER -h $MyHOST -p$MyPASS $db | $GZIP -9 > $FILE
        THISRESULT=$?
        RESULT=RESULT+THISRESULT
        echo Dump file for database $db should be here:
        echo `ls -l $FILE`
        if [[ $THISRESULT -ne 0 ]]; then
          echo "!!!! An error occured while running mysqldump. Please report this !!!!"
        fi
    fi
done
echo Backup finished at `date`
if [[ $RESULT -ne 0 ]]; then
echo "!!!! There was at least one error, please report this !!!!"
fi
exit $RESULT