#!/bin/bash
#cript:mysqlbackup.sh
#Version:Release 2.0
#author:www.dba-china.com
#date:2011-10-27
#以下配置信息请自己修改
mysql_user="root" #MySQL备份用户
mysql_password="password" #MySQL备份用户的密码
mysql_host="127.0.0.1" #要备份的主机，一般为localhost
mysql_port="3306" #MySQL端口号，一般为3306
backup_db_arr=("cms" "ad") #要备份的数据库名称，多个用空格分开隔开 如("db1" "db2" "db3")
backup_location='/home/lhb/backup_mysql_data'  #备份数据存放位置，末尾请不要带"/",此项可以保持默认，程序会自动创建文件夹
expire_backup_delete="ON" #是否开启过期备份删除 ON为开启 OFF为关闭
expire_days=40 #过期时间天数 默认为三天，此项只有在expire_backup_delete开启时有效
#以下配置请保持默认不要修改
backup_time=`date +%Y%m%d%H%M`  #定义备份详细时间
backup_Ymd=`date +%Y%m%d` #定义备份目录中的年月日时间
backup_3ago=`date -d '3 days ago' +%Y%m%d` #3天之前的日期
backup_dir=$backup_location/$backup_Ymd  #备份文件夹全路径
welcome_msg="Welcome to use MySQL backup tools!" #欢迎语
#判断MYSQL是否启动,mysql没有启动则备份退出
mysql_ps=`ps -ef |grep mysql |wc -l`
mysql_listen=`netstat -an |grep LISTEN |grep $mysql_port|wc -l`
if [ [$mysql_ps == 0] -o [$mysql_listen == 0] ]; then
        echo "ERROR:MySQL is not running! backup stop!"
        exit
else
        echo $welcome_msg
fi
#连接到mysql数据库，无法连接则备份退出
mysql -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password <<end
use mysql;
select host,user from user where user='root' and host='localhost';
exit
end
flag=`echo $?`
if [ $flag != "0" ]; then
        echo "ERROR:Can't connect mysql server! backup stop!"
        exit
else
        echo "MySQL connect ok! Please wait......"
        #判断有没有定义备份的数据库，如果定义则开始备份，否则退出备份
        if [ "$backup_db_arr" != "" ];then
                #dbnames=$(cut -d ',' -f1-5 $backup_database)
                #echo "arr is (${backup_db_arr[@]})"
                for dbname in ${backup_db_arr[@]}
                do
                               echo "database $dbname backup start..."
                        `mkdir -p $backup_dir`
                        `mysqldump -h$mysql_host -P$mysql_port -u$mysql_user -p$mysql_password $dbname > $backup_dir/$dbname$backup_time.sql`
                        flag=`echo $?`
                        if [ $flag == "0" ];then
                                echo "database $dbname success backup to $backup_dir/$dbname$backup_time.sql"
                        else
                                echo "database $dbname backup fail!"
                        fi
                            
                done
        else
                echo "ERROR:No database to backup! backup stop"
                exit
        fi
        #如果开启了删除过期备份，则进行删除操作
        if [ "$expire_backup_delete" == "ON" -a  "$backup_location" != "" ];then
                `find $backup_location/ -type d -o -type f -ctime +$expire_days -exec rm -rf {} \;`
        `find $backup_location/ -type d -empty -exec rm -rf {} \;`
                 echo "Expired backup data delete complete!"
        fi
        echo "All database backup success! Think you!"
        exit
fi