Uploading mariadb-backup.sh

script/mariadb-backup.sh

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+#!/bin/bash
+#===============================================================
+# NAME      :  mariadb-backup.sh
+# Programmer:  Raul Neiva
+# Date      :  20-Feb-2021
+# Purpose   :  Simple MySQL backup script for MariaDB backups + keep old files on Linux
+# Changes history:
+#
+#  Date     |     By        | Changes/New features
+# ----------+---------------+-----------------------------------
+# 15-02-21    Raul Neiva       Initial version
+#===============================================================
+
+#===========================================
+# Colors
+#===========================================
+
+export RED=$(tput setaf 1)
+export BGRED=$(tput setab 1)
+export GREEN=$(tput setaf 2)
+export BLDGREEN=$(tput bold)$(tput setaf 2)
+export YELLOW=$(tput setaf 3)
+export BLDYELLOW=$(tput bold)$(tput setaf 3)
+export BLUE=$(tput setaf 4)
+export BLDBLUE=$(tput bold)$(tput setaf 4)
+export PURPLE=$(tput setaf 5)
+export CYAN=$(tput setaf 6)
+export WHITE=$(tput setaf 7)
+export BOLD=$(tput bold)
+export NORMAL=$(tput sgr0)
+
+#===========================================
+# Main
+#===========================================
+
+## set default variables
+backup_root=/srv/backups/mariadb	# root directory for all backups
+v=true					                  # verbose output
+keep=7					                  # number of old backups to keep
+hash=sha256				                # crypto hash to use for checksums
+
+# set mysqldump options
+dumpopts='--single-transaction --flush-logs --flush-privileges'
+
+## don't edit below this line
+
+# get our options
+while getopts qk:h: opt; do
+  case $opt in
+  q)
+      v=false
+      ;;
+  k)
+      keep=$OPTARG 
+      ;;
+  h)
+      hash=$OPTARG 
+      ;;
+  esac
+done
+shift $((OPTIND - 1))
+
+# set a righteous mask
+umask 0027
+
+# create backup path
+stamp=`date +%Y-%m-%d.%H%M%S`
+backup_dir=${backup_root}/${stamp}
+mkdir -p ${backup_dir}
+$v && printf 'Keeping %s backups.\n' $keep
+$v && printf 'Backup location: %s\n' $backup_dir
+
+## set some functions
+
+# get a list of databases to backup (strip out garbage and internal databases)
+_get_db_list () {
+  mysqlshow | \
+    sed -r '/Databases|information_schema|performance_schema/d' | \
+    awk '{ print $2 }'
+}
+
+# get a list of backups in the backup directory, ignore files and links
+# make this a pattern match later
+_get_backups () {
+  (cd $backup_root && find ./* -maxdepth 1 -type d -exec basename {} \;)
+}
+
+# dump database
+_dump_db () {
+   nice -n 19 mysqldump $dumpopts $1 | nice -n 19 gzip
+}
+
+# create checksums
+_checksum () {
+  sum=`openssl $hash $1 | cut -d' ' -f2`
+  printf '%s %s\n' $sum `basename $1`
+}
+
+# get the database list and remove garbage
+db_list=`_get_db_list`
+
+# run the backup
+for db in $db_list; do
+   $v && printf 'Backing up "%s" database...' $db
+   _dump_db $db > ${backup_dir}/${db}.sql.gz
+   _checksum ${backup_dir}/${db}.sql.gz >> ${backup_dir}/${hash^^}SUMS
+   $v &&printf ' done.\n'
+done
+
+# create a link to current backup
+(cd $backup_root && rm -f latest && ln -s ${stamp} latest)
+
+# find out how many backup directories are in the root
+dirnum=`_get_backups | wc -l`
+diff=$(expr $dirnum - $keep)
+
+# figure out if we need to delete any old backups
+if [ "$diff" -gt "0" ]; then
+  $v && printf 'Removing %s old backup(s):\n' $diff
+  for d in `_get_backups | sort | head -n $diff`; do
+    $v && printf '  %s\n' $d
+    rm -rf ${backup_root}/${d}
+  done
+else
+  $v && printf 'No old backups to remove (found %s).\n' $dirnum
+fi