Rolling backup for mariadb. Rsync $BACKUPPATH to some other $HOST to have a rolling backup.

backup-db.sh

#!/bin/bash

BACKUPHOST=10.20.30.40
PASSWORD=fettmepara
USERNAME=sst_user
BACKUPPATH=/backup/db

OPTIONS="--backup --compress --compress-threads=4 --host $BACKUPHOST --user $USERNAME --password=$PASSWORD"
STARTDAY=1 # 0=Sun, 1=Mon etc

DATE=$(date +%Y%m%dT%H%M)
WEEKDAY=$(date +%w)

ERR=""
echo $DATE

if [ -d $BACKUPPATH.prev ]; then
        echo "Error, previous backup exist, something is bad!"
fi

{
        if [[ $WEEKDAY -eq $STARTDAY ]]; then
                echo "Move previous week out of the way"
                [ -d $BACKUPPATH ] && mv $BACKUPPATH $BACKUPPATH.prev
                [[ $? -eq 0 ]] || ERR+="Error moving backup to prev"

                echo "Create new $BACKUPPATH"
                mkdir $BACKUPPATH
                [[ $? -eq 0 ]] || ERR+="Error creating new backup dir"

                echo "Creating full backup for day: $WEEKDAY"
                mariabackup $OPTIONS --target-dir=$BACKUPPATH/full

                # check for errors
                [[ $? -eq 0 ]] || ERR+="Error doing full backup"

        elif [[ $WEEKDAY -gt $STARTDAY ]]; then
                echo "Creating incremental backup for day: $WEEKDAY"
                mariabackup $OPTIONS --target-dir=$BACKUPPATH/day$WEEKDAY --incremental-basedir=$BACKUPPATH/full

                # check for errors
                [ $? -eq 0 ] || ERR+="Error doing incremental backup for day $WEEKDAY"

        fi

        if [ "$ERR" != "" ]; then
                echo "Errors found with backup!"
                # todo, add signal here
        else
                echo "Removing previous backups"
                [ -d $BACKUPPATH.prev ] && rm -rf $BACKUPPATH.prev
        fi

} | logger -t backupdb