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#!/usr/bin/env bash
#################################################################################
# AUTHOR: H. P. <mail_redacted_for_web>
# LICENSE: LGPLv3
# Version: 0.1
#
# Small aka. rather quick and dirty script to backup your SQL databases.
#
# What this script does is looking for existing databases and backup all of them.
# The result will be sql.xz files inside /tmp/sqlbackup.XXXXXX.
#
# TO-DOS:
# 1. Create possibilities to define the following through CLI options:
# --- DONE --- 1.1. MySQL user, and password command(!)
# 1.2. DB exclusion regex
# 1.3. Location of configuration file or log
#################################################################################
function help {
printf "USAGE: %b [-h] [-l] [-b DIR] [-u USER] [-p PASSWORD]\n\n" "$(basename "$0")"
printf -- "-h:\tThis help\n"
printf -- "-b:\tBackup target directory\n"
printf -- "-l:\tLog to syslog\n"
printf -- "-p:\tPassword string for MySQL user (hint: use a command for this!)\n"
printf -- "-u:\tUser in MySQL designated for backups\n"
}
function mlogger {
[ -z "$2" ]&&return 1
[ -z "$1" ]&&return 1
logger -t "sqlbackup" -p "local3.""$1" "$2"
}
function bstatus {
case "$CURDB" in
"") printf "Status: Preparing backup.\n";;
*) printf "Status: Backing up %b.\n" "$CURDB";;
esac
}
function bkillme {
printf "\n[CRIT] Got a termination signal, committing sudoku...\n"
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger warning "Terminating on external request"
exit 130
}
trap bkillme SIGINT
trap bkillme SIGKILL
trap bkillme SIGTERM
trap bstatus USR1
declare -x BUSER BDIR DBFDIR LOGGER CURDB SCHANAUZE=0 PRMERR=0
while getopts :hld:u:p:q SHOPT;do
case "$SHOPT" in
h) help;exit 0;;
l) LOGGER=1;;
b) BDIR="${OPTARG}";;
d) DBFDIR="${OPTARG}";;
u) BUSER="${OPTARG}";;
p) BPW="${OPTARG}";;
q) SCHANAUZE=1;;
*)
help
printf "\n[ ]\033[s%b Not an option or empty parameter: -%b\n" \
"$NEE" "$OPTARG" >&2
#[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&\
mlogger err "Not an option or empty parameter: -$OPTARG"
PRMERR=$((PRMERR+1))
;;
esac
done
shift $((OPTIND-1))
[ "$PRMERR" -gt 0 ]&&exit 1
# Leave this line alone - location of script
MYDIR="$(cd "$(dirname "$0")"&&pwd)"
# The backup directory. The line here means we will create /tmp/sqlbackup.XXXXXX
# and backup there. If you want another value, enter this here.
#BDIR="$MYDIR/files"
if [ -z "$BDIR" ];then
BDIR="$(mktemp -d /tmp/sqlbackup.XXXXXX)"||exit 187
fi
# The backup user:
[ -z "$BUSER" ]&&BUSER="tVY8MwA7cTEm"
# Password file. For now, this is unencrypted, so please make this file secure!
# Expects just the password, one line. Also, you will want to use a dedicated
# user for that:
# GRANT SELECT, SHOW DATABASES, LOCK TABLES ON *.* TO 'backupheiner'@'localhost';
#PWFL="$MYDIR/pw"
if [ -z "$BPW" ];then
PWFL="/etc/sqlbackup/pw"
if [ ! -r "$PWFL" ];then
help
printf "\n[ ]\033[s%b %b not readable, no password supplied!\n" "$NEE" "$PWFL" >&2
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&\
mlogger err "$PWFL not readable, no password supplied"
exit 1
fi
fi
# Location of the mysql/maria db files, default: /var/lib/mysql. No trailing slashes.
[ -z "$DBFDIR" ]&&DBFDIR="/var/lib/mysql"
# Databases to be excluded. Meant to work with grep -P, i.e. perl regular expressions.
# The minimum is to separate any database with the pipe character (|).
# Caution: an empty variable will backup nothing.
#
# The default line excludes the MySQL internal databases:
#NODB="^information_schema$|^mysql$|^performance_schema$"
# Very offensive backup, meaning even internals - should exclude information_schema:
NODB="^information_schema$|^performance_schema$"
#########
# MYSQL #
#########
DUMPOPTS=( "--add-drop-table" "--add-locks" )
DUMPOPTS+=( "--complete-insert" "--create-options" "--max_allowed_packet=512M" )
# Flush on backup of every subordinate db would create too many new files.
# Hence, commented out.
#DUMPOPTS+=( "--flush-logs" )
ISAM_DUMPOPTS=( ${DUMPOPTS[@]} "--lock-tables" )
INNO_DUMPOPTS=( ${DUMPOPTS[@]} "--single-transaction" )
############
# RET VERB #
############
OGE="\033[666D[ \033[0;32mOK \033[0m]\033[u\033[K"
NEE="\033[666D[\033[0;31mFAIL\033[0m]\033[u\033[K"
WAT="\033[666D[\033[0;33mWARN\033[0m]\033[u\033[K"
[ -z "$BDIR" ]&&printf "No backup directory specified!" >&2&&exit 191
mkdir -p "$BDIR"&&chmod 0700 "$BDIR"||exit 188
BLOG="$BDIR""/sqlbackup.log"
touch "$BLOG"||exit 189
# check normal write exit explicitly before first write to ensure there is no
# "backyard" file lock like stale mounts or whatever
true >> "$BLOG"||exit 189
chmod 0600 "$BLOG"||exit 190
#########
TIME="$(date +"%Y-%m-%dT%H:%M:%S%z")"
[ "$SCHANAUZE" -ne 1 ]&&printf "File timestamp: %s\n" "$TIME"
printf "File timestamp: %s\n" "$TIME" >> "$BLOG"
# Flush prior to backups, do not purge.
[ "$SCHANAUZE" -ne 1 ]&&printf "\n[....] Flushing logs.\033[s..\033[0m"
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger info "flushing logs"
mysql --user="$BUSER" --password="$(cat $PWFL)" -e "flush logs \\G" 2>> "$BLOG"
if [ "$?" -ne 0 ];then
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger err "flushing logs failed, check $BLOG"
[ "$SCHANAUZE" -ne 1 ]&&printf "$NEE\n\n"
exit 101
else
[ "$SCHANAUZE" -ne 1 ]&&printf "$OGE\n\n"
fi
exit 0
LOGPOS="$(mysql --user="$BUSER" --password="$(cat $PWFL)" -e "show master status \G"|grep Position|awk '{print $NF}')"
[ "$SCHANAUZE" -ne 1 ]&&printf "Log position: %s\n" "$LOGPOS"
printf "Log position: %s\n" "$LOGPOS" >> "$BLOG"
# Get latest non-relay binary log:
find "$DBFDIR" -maxdepth 1 -cmin 2 >/dev/null 2>&1
if [ "$?" -ne 0 ];then
[ "$SCHANAUZE" -ne 1 ]&&printf "[ ]\033[s%b Failed to read %b for binary logs.\n" "$NEE" "$DBFDIR"
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger err "Failed to read $DBFDIR for binary logs."
exit 127
fi
BINLOGF="$(find "$DBFDIR" -maxdepth 1 -nowarn -type f -regextype posix-extended -regex ".*-bin\.[0-9]+$"|grep -v relay-bin|awk -F\. '{print $NF,$0}'|sort -n|cut -f2- -d' '|tail -1)"
BINLOGF="$(basename "$BINLOGF")"
[ -z "$BINLOGF" ]&&exit 127
DBARR=( $(mysql -u "$BUSER" --password="$(cat $PWFL)" -e "show databases \\G"|grep ^Data|awk '{print $NF}'|grep -vP "$NODB") )
j=1
[ "$SCHANAUZE" -ne 1 ]&&printf "\nDatabases being backed up\n======================\n"
[ "$SCHANAUZE" -ne 1 ]&&for i in ${DBARR[@]};do
echo -n "$i"
case "$(( j % 3 ))" in
0) echo " " ;;
*) echo -n ";";;
esac
j="$((j+1))"
done|column -ts\;
[ "$SCHANAUZE" -ne 1 ]&&printf "\n"
[ "$SCHANAUZE" -ne 1 ]&&printf "Current binary log: %b\n\n" "$BINLOGF"
for i in "${DBARR[@]}";do
CURDB="$i"
[ "$SCHANAUZE" -ne 1 ]&&printf "[....] Backing up database %s.\033[s..\033[0m" "$i"
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger info "backing up database $i"
sleep 0.1337
[ "$SCHANAUZE" -ne 1 ]&&printf ".. \033[u\033[K \033[1;30mdump running...\033[0m"
if ( [ "$i" == "mysql" ] || [ "$i" == "information_schema" ] || [ "$i" == "performance_schema" ] );then
mysqldump "${ISAM_DUMPOPTS[@]}" -u "$BUSER" --password="$(cat "$PWFL")" --databases "$i" > "$BDIR/$i-$TIME.sql" 2>> "$BLOG"
else
mysqldump "${INNO_DUMPOPTS[@]}" -u "$BUSER" --password="$(cat "$PWFL")" --databases "$i" > "$BDIR/$i-$TIME.sql" 2>> "$BLOG"
fi
if [ "$?" -ne 0 ];then
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger err "backup of $i failed, check $BLOG"
[ "$SCHANAUZE" -ne 1 ]&&echo -e "$NEE"
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger err "backup failed, check $BLOG"
exit 2
fi
sleep 0.1337
[ "$SCHANAUZE" -ne 1 ]&&printf ".. \033[u\033[K \033[1;30mcompression running...\033[0m"
xz "$BDIR/$i-$TIME.sql"&&chmod 0600 "$BDIR/$i-$TIME.sql.xz"
if [ "$?" -ne 0 ];then
[ "$SCHANAUZE" -ne 1 ]&&echo -e "$NEE"
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger err "compression failed, check $BLOG"
exit 3
fi
sleep 0.1337
echo -e "$OGE"
done
[ "$SCHANAUZE" -ne 1 ]&&printf "[....] Purging binary logs.\033[s..\033[0m"
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger info "Purging binary logs..."
mysql --user="$BUSER" --password="$(cat $PWFL)" -e "purge binary logs to \"$BINLOGF\" \\G" 2>> "$BLOG"
if [ "$?" -ne 0 ];then
[ "$SCHANAUZE" -ne 1 ]&&echo -e "$NEE"
[ ! -z "$LOGGER" ]&&[ "$LOGGER" -eq 1 ]&&mlogger err "purging of binary logs failed, check $BLOG"
exit 3
fi
sleep 0.1337
echo -e "$OGE"
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