定时备份数据库
/usr/sbin/backupmysql
timestamp=`date +"%Y-%m-%d-%H-%M-%S"`
mysqldump -uroot -p'123456 databasename>/db$timestamp.sql
chmod +x backupmysql
安装crontab:
[root@CentOS ~]# yum install vixie-cron
[root@CentOS ~]# yum install crontabs
第一种方式
crontab -e 新增定时任务
0 3 * * * /usr/sbin/backupmysql
crontab -l 显示定时任务
另外一种方式（需指定运行用户）
[root@iZ25qgz369eZ dbbackup]# vi /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/
# For details see man 4 crontabs
# Example of job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * user-name command to be executed
30 18 * * * root /usr/sbin/backupmysql