mysql 自动备份

环境

centos 6.5
mysql 5.7.14

实现功能

备份所有数据库，并且保留最近五天的数据。

#!/bin/sh  
# mysql_backup.sh: backup mysql databases and keep newest 5 days backup.  
#  
# db_user is mysql username  
# db_passwd is mysql password  
# db_host is mysql host  
# —————————–  
db_user="root"  
db_passwd="12345678"  
db_host="localhost"  

# the directory for story your backup file.  
backup_dir="/home/mysqlbackup"  

# date format for backup file (dd-mm-yyyy)  
time="$(date +"%d-%m-%Y")"  

# mysql, mysqldump and some other bin's path  
MYSQL="/usr/bin/mysql"  
MYSQLDUMP="/usr/bin/mysqldump"  
MKDIR="/bin/mkdir"  
RM="/bin/rm"  
MV="/bin/mv"  
GZIP="/bin/gzip"  

# check the directory for store backup is writeable  
test ! -w $backup_dir && echo "Error: $backup_dir is un-writeable." && exit 0  

# the directory for story the newest backup  
test ! -d "$backup_dir/backup.0/" && $MKDIR "$backup_dir/backup.0/"  

# get all databases  
all_db="$($MYSQL -u $db_user -h $db_host -p$db_passwd -Bse 'show databases')"  
for db in $all_db  
do  
$MYSQLDUMP -u $db_user -h $db_host -p$db_passwd $db --skip-lock-tables | $GZIP -9 > "$backup_dir/backup.0/$time.$db.gz"  
done  

# delete the oldest backup  
test -d "$backup_dir/backup.5/" && $RM -rf "$backup_dir/backup.5"  

# rotate backup directory  
for int in 4 3 2 1 0  
do  
if(test -d "$backup_dir"/backup."$int")  
then  
next_int=`expr $int + 1`  
$MV "$backup_dir"/backup."$int" "$backup_dir"/backup."$next_int"  
fi  
done  
exit 0;

需要注意的是，备份目录在备份动作执行前，需要手动创建，然后通过root账号，使用crontab执行定时任务。

可能出现的问题

The 'INFORMATION_SCHEMA.GLOBAL_STATUS' feature is disabled: see the documentation for 'show_compatibility_56'
解决方法：进入mysql命令模式，执行以下sql语句

set @@global.show_compatibility_56=ON;