Script to backup mysql databases from multiple connections defined in the .my.cnf file

!mariadb-backup

#!/bin/bash

# Based on Gabriel O'Brien's mariadb-backup.sh (https://github.com/gmobrien/mariadb-backup.sh)
# The main difference is that this script use the mysql config groups to allow backups from multiple connections simultaneously
# Check the original license bellow (https://gist.github.com/Eihen/53be043c217009d5705da28e07a1b1f4#file-license)
# If not in violation of that license you can do whatever you want with this

set -ef -o pipefail

# Set the default values
SUFFIXES=()
TO_FLUSH=()
ROOT='/var/lib/mysql/dumps'
FLUSHS='--flush-logs --flush-privileges'
DUMP_OPTS='--events --routines --single-transaction'
KEEP=60
HASH=sha256
FORMAT='+%Y-%m-%d_%H-%M-%S'

while getopts dg:r:no:k:h:f: opt; do
    case $opt in
        \?) echo '-d: Use the defaults set for mysqldump/mysqlshow as one of the connections'
            echo '-g <group>: Defaults group suffix to use (can be used multiple times)'
            echo "-r <path>: Database backups root (Default: $ROOT)"
            echo '-n: Do not flush things (use after the groups that should not be flushed)'
            echo "-o <opts>: Dump options (Default: $DUMP_OPTS)"
            echo "-k <amount>: Amount of backups to keep (Default: $KEEP_AMOUNT)"
            echo "-h <alg>: Hash algorithm for the checksums (Default: $HASH)"
            echo "-f <format>: Format for the timestamps (Default: $STAMP_FORMAT)"
            exit 1;;

        d)  SUFFIXES+=('')
            TO_FLUSH+=(true)
            ;;

        g)  SUFFIXES+=("${OPTARG}")
            TO_FLUSH+=(true)
            ;;

        r)  ROOT="${OPTARG}";;

        n)  TO_FLUSH[$((${#TO_FLUSH[@]} - 1))]=false;;

        o)  DUMP_OPTS="${OPTARG}";;

        k)  KEEP="${OPTARG}";;

        h)  HASH="${OPTARG}";;

        f)  FORMAT="${OPTARG}";;
    esac
done

# Set a secure mask for the backups
umask 0027

# Create backup dir
STAMP="$(date $FORMAT)"
DIR="${ROOT}/${STAMP}"
mkdir -p "${DIR}"

echo "Backup location: $DIR"

function getDatabases() {
    mysqlshow $1 \
        | sed -r '/Databases|information_schema|performance_schema|mysql/d' \
        | awk '{ print $2 }' \
        | sed -r '/^$/d'
}

function dumpDatabase() {
    nice -n 19 mysqldump $2 $1 | nice -n 19 gzip
}

function checksum() {
    CHECKSUM="$(openssl $1 $2 | cut -d' ' -f2)"
    echo "$(basename $2) $CHECKSUM"
}

function getBackups() {
    find "${ROOT}" -maxdepth 1 -type d -exec basename {} \;
}

# Dump databases
for SUFFIX in "${SUFFIXES[@]}"; do
    if [ $SUFFIX ]; then
        DEFAULTS="--defaults-group-suffix=_$SUFFIX"

        # Avoid conflicts between database names in different connections
        AT="@${SUFFIX}"
    fi

    # Get database list for this group
    DATABASES=("$(getDatabases $DEFAULTS)")
    COUNTER=0

    for DATABASE in ${DATABASES[@]}; do
        printf 'Backing up %s%s...' $DATABASE $AT

        ARGS="${DEFAULTS} ${DUMP_OPTS}"
        if [ "${TO_FLUSH[$COUNTER]}" = true ]; then
            ARGS+=" ${FLUSHES}"
        fi

        dumpDatabase $DATABASE $ARGS > "${DIR}/${DATABASE}${AT}.sql.gz"
        checksum "${HASH}" "${DIR}/${DATABASE}${AT}.sql.gz" >> "${DIR}/${HASH^^}SUMS"

        echo "Done!"

        COUNTER=$((COUNTER + 1))
    done
done

# Create a symlink for the latest backup
echo "Creating latest symlink..."
rm -f "${ROOT}/latest"
ln -s "${DIR}" "${ROOT}/latest"

# Delete old backups if the amount exceed $KEEP
count="$(getBackups | wc -l)"
diff="$(($count - $KEEP))"

if [  "${diff}" -gt "0" ]; then
    echo "Removing ${diff} old backup(s):"
    for backup in "$(getBackups | sort | head -n ${diff})"; do
    echo "  - $backup"
        rm -rf "${ROOT}/${backup}"
    done
else
    echo "No old backups to remove (Existing: ${count} of ${KEEP})"
fi

LICENSE

The MIT License (MIT)

Copyright (c) 2015 Gabriel M. O'Brien

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.