#!/bin/bash
#
# MySQL Backup Script

USERNAME=username
PASSWORD=password
DBHOST=localhost
DBNAMES="all"
BACKUPDIR="/path/to/backup/dir"
MAXATTSIZE="4000"
MDBNAMES="mysql $DBNAMES"

# List of DBNAMES to EXLUCDE if DBNAMES are set to all (must be in " quotes)
DBEXCLUDE="mysql information_schema test"

# Include CREATE DATABASE in backup?
CREATE_DATABASE=yes

# Separate backup directory and file for each DB? (yes or no)
SEPDIR=yes

# Which day do you want weekly backups? (1 to 7 where 1 is Monday)
DOWEEKLY=5

COMP=gzip

#  The maximum size of the buffer for client/server communication. e.g. 16MB (maximum is 1GB)
MAX_ALLOWED_PACKET=

#  For connections to localhost. Sometimes the Unix socket file must be specified.
SOCKET=

#PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/mysql/bin
DATE=`date +%Y-%m-%d_%Hh%Mm`                            # Datestamp e.g 2002-09-21
DOW=`date +%A`                                          # Day of the week e.g. Monday
DNOW=`date +%u`                                         # Day number of the week 1 to 7 where 1 represents Monday
DOM=`date +%d`                                          # Date of the Month e.g. 27
M=`date +%B`                                            # Month e.g January
W=`date +%V`                                            # Week Number e.g 37

LOGFILE=$BACKUPDIR/logs/$DBHOST-`date +%N`.log          # Logfile Name
LOGERR=$BACKUPDIR/logs/ERRORS_$DBHOST-`date +%N`.log    # Logfile Name
BACKUPFILES=""
OPT="--quote-names --opt"                       				# OPT string for use with mysqldump ( see man mysqldump )

# Add --compress mysqldump option to $OPT
if [ "$COMMCOMP" = "yes" ];
        then
                OPT="$OPT --compress"
        fi
# Add --compress mysqldump option to $OPT
if [ "$MAX_ALLOWED_PACKET" ];
        then
                OPT="$OPT --max_allowed_packet=$MAX_ALLOWED_PACKET"
        fi

# Create required directories
if [ ! -e "$BACKUPDIR" ]                # Check Backup Directory exists.
        then
        mkdir -p "$BACKUPDIR"
fi

if [ ! -e "$BACKUPDIR/daily" ]          # Check Daily Directory exists.
        then
        mkdir -p "$BACKUPDIR/daily"
fi

if [ ! -e "$BACKUPDIR/weekly" ]         # Check Weekly Directory exists.
        then
        mkdir -p "$BACKUPDIR/weekly"
fi

if [ ! -e "$BACKUPDIR/monthly" ]        # Check Monthly Directory exists.
        then
        mkdir -p "$BACKUPDIR/monthly"
fi

# IO redirection for logging.
touch $LOGFILE
exec 6>&1           # Link file descriptor #6 with stdout.
                    # Saves stdout.
exec > $LOGFILE     # stdout replaced with file $LOGFILE.
touch $LOGERR
exec 7>&2           # Link file descriptor #7 with stderr.
                    # Saves stderr.
exec 2> $LOGERR     # stderr replaced with file $LOGERR.


# Functions

# Database dump function
dbdump () {
mysqldump --user=$USERNAME --password=$PASSWORD --host=$DBHOST $OPT $1 > $2
return 0
}

# Compression function plus latest copy
SUFFIX=""
compression () {
if [ "$COMP" = "gzip" ]; then
        gzip -f "$1"
        echo
        echo Backup Information for "$1"
        gzip -l "$1.gz"
        SUFFIX=".gz"
elif [ "$COMP" = "bzip2" ]; then
        echo Compression information for "$1.bz2"
        bzip2 -f -v $1 2>&1
        SUFFIX=".bz2"
else
        echo "No compression option set, check advanced settings"
fi
return 0
}

if [ "$SEPDIR" = "yes" ]; then # Check if CREATE DATABSE should be included in Dump
        if [ "$CREATE_DATABASE" = "no" ]; then
                OPT="$OPT --no-create-db"
        else
                OPT="$OPT --databases"
        fi
else
        OPT="$OPT --databases"
fi

# Hostname for LOG information
if [ "$DBHOST" = "localhost" ]; then
        HOST=`hostname`
        if [ "$SOCKET" ]; then
                OPT="$OPT --socket=$SOCKET"
        fi
else
        HOST=$DBHOST
fi

# If backing up all DBs on the server
if [ "$DBNAMES" = "all" ]; then
        DBNAMES="`mysql --user=$USERNAME --password=$PASSWORD --host=$DBHOST --batch --skip-column-names -e "show databases"| sed 's/ /%/g'`"

        # If DBs are excluded
        for exclude in $DBEXCLUDE
        do
                DBNAMES=`echo $DBNAMES | sed "s/\b$exclude\b//g"`
        done

        MDBNAMES=$DBNAMES
fi

# Test is seperate DB backups are required
if [ "$SEPDIR" = "yes" ]; then
        # Monthly Full Backup of all Databases
        if [ $DOM = "01" ]; then
                for MDB in $MDBNAMES
                do

                         # Prepare $DB for using
                        MDB="`echo $MDB | sed 's/%/ /g'`"

                        if [ ! -e "$BACKUPDIR/monthly/$MDB" ]           # Check Monthly DB Directory exists.
                        then
                                mkdir -p "$BACKUPDIR/monthly/$MDB"
                        fi
                        echo Monthly Backup of $MDB...
                                dbdump "$MDB" "$BACKUPDIR/monthly/$MDB/${MDB}_$DATE.$M.$MDB.sql"
                                compression "$BACKUPDIR/monthly/$MDB/${MDB}_$DATE.$M.$MDB.sql"
                                BACKUPFILES="$BACKUPFILES $BACKUPDIR/monthly/$MDB/${MDB}_$DATE.$M.$MDB.sql$SUFFIX"
                        echo ----------------------------------------------------------------------
                done
        fi

        for DB in $DBNAMES
        do
        # Prepare $DB for using
        DB="`echo $DB | sed 's/%/ /g'`"

        # Create Seperate directory for each DB
        if [ ! -e "$BACKUPDIR/daily/$DB" ]              # Check Daily DB Directory exists.
                then
                mkdir -p "$BACKUPDIR/daily/$DB"
        fi

        if [ ! -e "$BACKUPDIR/weekly/$DB" ]             # Check Weekly DB Directory exists.
                then
                mkdir -p "$BACKUPDIR/weekly/$DB"
        fi

        # Weekly Backup
        if [ $DNOW = $DOWEEKLY ]; then
                echo Weekly Backup of Database \( $DB \)
                echo Rotating 5 weeks Backups...
                        if [ "$W" -le 05 ];then
                                REMW=`expr 48 + $W`
                        elif [ "$W" -lt 15 ];then
                                REMW=0`expr $W - 5`
                        else
                                REMW=`expr $W - 5`
                        fi
                eval rm -fv "$BACKUPDIR/weekly/$DB_week.$REMW.*"
                echo
                        dbdump "$DB" "$BACKUPDIR/weekly/$DB/${DB}_week.$W.$DATE.sql"
                        compression "$BACKUPDIR/weekly/$DB/${DB}_week.$W.$DATE.sql"
                        BACKUPFILES="$BACKUPFILES $BACKUPDIR/weekly/$DB/${DB}_week.$W.$DATE.sql$SUFFIX"
                echo ----------------------------------------------------------------------

        # Daily Backup
        else
                echo Daily Backup of Database \( $DB \)
                echo Rotating last weeks Backup...
                eval rm -fv "$BACKUPDIR/daily/$DB/*.$DOW.sql.*"
                echo
                        dbdump "$DB" "$BACKUPDIR/daily/$DB/${DB}_$DATE.$DOW.sql"
                        compression "$BACKUPDIR/daily/$DB/${DB}_$DATE.$DOW.sql"
                        BACKUPFILES="$BACKUPFILES $BACKUPDIR/daily/$DB/${DB}_$DATE.$DOW.sql$SUFFIX"
                echo ----------------------------------------------------------------------
        fi
        done
echo Backup End `date`
echo ======================================================================


else # One backup file for all DBs
echo Backup Start `date`
echo ======================================================================
        # Monthly Full Backup of all Databases
        if [ $DOM = "01" ]; then
                echo Monthly full Backup of \( $MDBNAMES \)...
                        dbdump "$MDBNAMES" "$BACKUPDIR/monthly/$DATE.$M.all-databases.sql"
                        compression "$BACKUPDIR/monthly/$DATE.$M.all-databases.sql"
                        BACKUPFILES="$BACKUPFILES $BACKUPDIR/monthly/$DATE.$M.all-databases.sql$SUFFIX"
                echo ----------------------------------------------------------------------
        fi

        # Weekly Backup
        if [ $DNOW = $DOWEEKLY ]; then
                echo Weekly Backup of Databases \( $DBNAMES \)
                echo
                echo Rotating 5 weeks Backups...
                        if [ "$W" -le 05 ];then
                                REMW=`expr 48 + $W`
                        elif [ "$W" -lt 15 ];then
                                REMW=0`expr $W - 5`
                        else
                                REMW=`expr $W - 5`
                        fi
                eval rm -fv "$BACKUPDIR/weekly/week.$REMW.*"
                echo
                        dbdump "$DBNAMES" "$BACKUPDIR/weekly/week.$W.$DATE.sql"
                        compression "$BACKUPDIR/weekly/week.$W.$DATE.sql"
                        BACKUPFILES="$BACKUPFILES $BACKUPDIR/weekly/week.$W.$DATE.sql$SUFFIX"
                echo ----------------------------------------------------------------------

        # Daily Backup
        else
                echo Daily Backup of Databases \( $DBNAMES \)
                echo
                echo Rotating last weeks Backup...
                eval rm -fv "$BACKUPDIR/daily/*.$DOW.sql.*"
                echo
                        dbdump "$DBNAMES" "$BACKUPDIR/daily/$DATE.$DOW.sql"
                        compression "$BACKUPDIR/daily/$DATE.$DOW.sql"
                        BACKUPFILES="$BACKUPFILES $BACKUPDIR/daily/$DATE.$DOW.sql$SUFFIX"
                echo ----------------------------------------------------------------------
        fi
fi
#Clean up IO redirection
exec 1>&6 6>&-      # Restore stdout and close file descriptor #6.
exec 1>&7 7>&-      # Restore stdout and close file descriptor #7.

exit $STATUS