Using rsnapshot and mysqldump to backup remote mySQL Databases - mysql

Question

I am using rsnapshot to backup our remote servers and I need to add MySQL backups.
rsnapshot calls a remote script that dumps the mysql DB's on the server. The problem is, the script does not exclude the information_schema database and therefore it dies )or appears to die and I have a second problem.)
I'm not sure how I would exclude the information_schema DB from this script:
### SETUP MYSQL LOGIN ###
MUSER='USER'
MPASS='PASSWORD'
MHOST="127.0.0.1"
### Set to 1 if you need to see progress while dumping dbs ###
VERBOSE=0
### Set bins path ###
GZIP=/bin/gzip
MYSQL=/usr/bin/mysql
MYSQLDUMP=/usr/bin/mysqldump
RM=/bin/rm
MKDIR=/bin/mkdir
MYSQLADMIN=/usr/bin/mysqladmin
GREP=/bin/grep
### Setup dump directory ###
BAKRSNROOT=/tmp/rsnapshot/mysql
#####################################
### ----[ No Editing below ]------###
#####################################
### Default time format ###
TIME_FORMAT='%H_%M_%S%P'
### Make a backup ###
backup_mysql_rsnapshot(){
local DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases')"
local db="";
[ ! -d $BAKRSNROOT ] && ${MKDIR} -p $BAKRSNROOT
${RM} -f $BAKRSNROOT/* >/dev/null 2>&1
[ $VERBOSE -eq 1 ] && echo "*** Dumping MySQL Database ***"
[ $VERBOSE -eq 1 ] && echo -n "Database> "
for db in $DBS
do
local tTime=$(date +"${TIME_FORMAT}")
local FILE="${BAKRSNROOT}/${db}.${tTime}.gz"
[ $VERBOSE -eq 1 ] && echo -n "$db.."
${MYSQLDUMP} -u ${MUSER} -h ${MHOST} -p${MPASS} $db | ${GZIP} -9 > $FILE
done
[ $VERBOSE -eq 1 ] && echo ""
[ $VERBOSE -eq 1 ] && echo "*** Backup done [ files wrote to $BAKRSNROOT] ***"
}
### Die on demand with message ###
die(){
echo "$#"
exit 999
}
### Make sure bins exists.. else die
verify_bins(){
[ ! -x $GZIP ] && die "File $GZIP does not exists. Make sure correct path is set in $0."
[ ! -x $MYSQL ] && die "File $MYSQL does not exists. Make sure correct path is set in $0."
[ ! -x $MYSQLDUMP ] && die "File $MYSQLDUMP does not exists. Make sure correct path is set in $0."
[ ! -x $RM ] && die "File $RM does not exists. Make sure correct path is set in $0."
[ ! -x $MKDIR ] && die "File $MKDIR does not exists. Make sure correct path is set in $0."
[ ! -x $MYSQLADMIN ] && die "File $MYSQLADMIN does not exists. Make sure correct path is set in $0."
[ ! -x $GREP ] && die "File $GREP does not exists. Make sure correct path is set in $0."
}
### Make sure we can connect to server ... else die
verify_mysql_connection(){
$MYSQLADMIN -u $MUSER -h $MHOST -p$MPASS ping | $GREP 'alive'>/dev/null
[ $? -eq 0 ] || die "Error: Cannot connect to MySQL Server. Make sure username and password are set correctly in $0"
}
### main ####
verify_bins
verify_mysql_connection
backup_mysql_rsnapshot

Answer 1

Look into mysqldump and its --all-databases parameter. Don't reinvent the wheel!
mysqldump does not dump theINFORMATION_SCHEMA database. If you name that database explicitly on the command line,mysqldump silently ignores it.
If you have a version of mysqldump that does really not exclude INFORMATION_SCHEMA and you need all DBs in seperate files, just exclude it from your loop:
for db in $DBS
do
if [ $db -ne "INFORMATION_SCHEMA" ] ; do
YOUR_STUFF()
done
dome

Answer 2

Replace the following line:
local DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases')"
with
local DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases' -s --skip-column-names|grep -vi information_schema)"