mysql數據庫備份腳本

概述

每天定時遠程或者本地備份mysql數據庫,並且保存最新7天的備份內容。

腳本內容

[root@myhost ~]# cat  /home/script/mysqlbackup.sh
#!/bin/sh 
#define variables
#the login information of your mysql db.
login_user=""
login_passwd=""
db_host=""
db_port=""
#the real databases which you want to backup.
db_name0=""
#the dir for saving your backup file.
backup_dir="/home/backup/mysql_bak/$db_host_dir/"
#date format for the backup file (yyyy-mm-dd) 
time=`date +"%Y-%m-%d"`
#the mysql,mysqldump and other bin's path
MYSQL_COMMDAND=""
MYSQLDUMP_COMMAND=""
MKDIR_COMMAND="/bin/mkdir"
RM_COMMAND="/bin/rm"
MV_COMMAND="/bin/mv"
GZIP_COMMAND="/bin/gzip"

# check the dir for saving backup file is writeable or not.
if [ ! -w  $backup_dir ];then

	echo "Error: $backup_dir is un-writeable." && exit 0 

fi

#check if the dir for saving the backup file exists or not.
if [ ! -d  ${backup_dir}/backup.0 ];then

	$MKDIR_COMMAND  -p "$backup_dir/backup.0"

fi

#starting to backup.

$MYSQLDUMP_COMMAND -P $db_port -u $login_user -h $db_host -p$login_passwd  $db_name0 | $GZIP_COMMAND -9 > "$backup_dir/backup.0/$time.$db_name0.gz" 

# delete the oldest backup 
if [ -d "$backup_dir/backup.7" ];then

	$RM_COMMAND -rf "$backup_dir/backup.7" 

fi


# rotate backup directory 

#for int in 6 5 4 3 2 1 0 
for int in {6..0}
do 
	if [ -d "$backup_dir"/backup."$int" ];then
		next_int=`expr  $int  + 1` 
		$MV_COMMAND "$backup_dir"/backup."$int" "$backup_dir"/backup."$next_int" 
	fi
done 
	
exit 0; 

定時任務

數據庫備份的定時任務儘量避開數據庫訪問的高峯期，可以選擇在半夜執行。

[root@myhost ~]# cat /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 3  *  *  * root /home/script/mysqlbackup.sh