mysql per database backup without mysql.event warning

mysql_backup

#!/bin/sh -

# The important part is not to put the password as an argument to the mysql
# commands, i.e. don't use the -p option. Instead use a .my.cnf file in the home
# dir of the user you are running this script as, i.e. /root/.my.cnf if running
# as root. Make the file readable for the owner only: chmod 400 /root/.my.cnf
# See: http://stackoverflow.com/questions/17829659/securing-backup-credentials-for-mysqldump/17844997#17844997

umask 007

renice 10 $$ >/dev/null

BACKUPPATH=/home/backup/last

for db in `mysql --batch --skip-column-names --execute="SHOW DATABASES" | egrep -v 'performance_schema|information_schema'`; do
  /usr/bin/nice /usr/bin/mysqldump --events --ignore-table=mysql.event --single-transaction --quick --extended-insert "$db" | gzip > "${BACKUPPATH}/mysql_${db}.sql.gz"
done

This does't work. Unknown option '--events'

I am getting this error :
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
But i dont want to put the root password in the script. how did you do?

@shadowbooker: just updated and tested with mysql 5.7

@rbahassine: use a .my.cnf file, see the comment I've added to the script. Do not use -p like in https://gist.github.com/ryanburnette/9456453, this is insecure.

I suggest altering the script to add directory timestamp to allow for daily backups.

umask 007

renice 10 $$ >/dev/null

TIMESTAMP=$(date +"%F")

BACKUPPATH="/home/backup/$TIMESTAMP"

for db in mysql --batch --skip-column-names --execute="SHOW DATABASES" | egrep -v 'performance_schema|information_schema'; do
/usr/bin/nice /usr/bin/mysqldump --events --ignore-table=mysql.event --single-transaction --quick --extended-insert "$db" | gzip > "${BACKUPPATH}/mysql_${db}.sql.gz"
done

@timkuijsten Can you explain what the purpose of renice 10 $$ >/dev/null is? I see that it modifies the process priority, but I don't understand why you pipe it to dev null?

@timkuijsten Can you explain what the purpose of renice 10 $$ >/dev/null is? I see that it modifies the process priority, but I don't understand why you pipe it to dev null?

On some systems renice outputs some informational text on stdout so this is discarded.

This is an example on Debian without redirect:

$ renice 10 $$
9884 (process ID) old priority 0, new priority 10

I always try to make a script generate no output on succes so that I can add it to cron without having to redirect stdout and easily detect if something goes wrong after it has been installed.

Ah, makes more sense now. Thank you