1、编辑/etc/crontab文件设定定时任务，在制定时间执行backup_databases.sh
vi /etc/crontab
# /etc/crontab: system-wide crontab # Unlike any other crontab you don't have to run the `crontab' # command to install the new version when you edit this file # and files in /etc/cron.d. These files also have username fields, # that none of the other crontabs do. SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly 25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) 47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) 52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly ) 25 9 * * * root sh /home/autotest/backup_databases.sh
2、编写backup_databases.sh，内容如下：
#!/bin/bash # Set the backup filename and directory DATE=`date +%Y%m%d` # e.g 20101025 FILENAME="trunk_development_database_$DATE.sql"; BACKUPDIR="/backup/"; # Database Credentials DBUSER="root"; DBPWD="123qwe^&*"; DBNAME="trunk_development"; # Change to the root directory cd / # Where is our gzip tool for compression? # The -f parameter will make sure that gzip will # overwrite existing files GZIP="/bin/gzip -f"; # Delete old backups older than 3 days find /backup/trunk_development_*gz -mtime +3 -exec rm {} ; # execute the database dump mysqldump --user=$DBUSER --password=$DBPWD --add-drop-table --databases $DBNAME > $BACKUPDIR$FILENAME # compress the database backup$GZIP $BACKUPDIR$FILENAME
3、手动创建目录/backup