shell脚本实现数据库备份

数据库备份

• 执行 db_dump.sh westos( 数据库密码 )
• 脚本执行后会备份数据库中的所有库到 /mnt/mysqldump 目录中，备份文件名称为 “库名称 .sql” 当此文件存在时报错并询问动作，输入“ S” 跳过备份，当输入“ B" 时备份“库名称 .sql” 文件为“库名称 _backup.sql”，当输入“ O” 时，覆盖源文件。

主要思路：
1.判定数据库服务的状态
2.判定密码是否正确
3.判定目录/mnt/mysqldump有没有
4.判定备份文件 库名称.sql存不存在 存在询问 不存在

#!/bin/bash
if [ ! -e "/var/lib/mysql/mysql.sock" ]            
then
	echo "Error: Mysql is not running"
	exit 1
elif [ -z "$1" ]
then
	echo "Error: Please show db password following $0"
	exit 1
fi
mysql -uroot -p$1 -e "show databases;" &> /dev/null
if [ "$?" -ne "0" ]
then
	echo "Error: Wrong password for db!!"
	exit 1
fi
[ -e "/mnt/mysqldump" ]||{
	mkdir -p /mnt/mysqldump
}
All_DB=`mysql -uroot -plee  -NE  -e  "SHOW DATABASES;" | sed '/^*/d;/schema$/d'`

Action_Choose()
{
		read -p "Please input your action: " ACTION
		case $ACTION in
			S|s|Skip|skip)
			;;
			B|b|Backup|backup)
			mv /mnt/mysqldump/${DBNAME}.sql /mnt/mysqldump/${DBNAME}_backup.sql
			mysqldump -uroot -p$1 $DBNAME > /mnt/mysqldump/${DBNAME}.sql	
			;;
			O|o|overwrite|Overwrite)
			mysqldump -uroot -p$1 $DBNAME > /mnt/mysqldump/${DBNAME}.sql
			;;
			*)
			echo "Error: Wrong action please input s|o|b|"
			Action_Choose
		esac

}

for DBNAME in $All_DB
do
	if [ -e "/mnt/mysqldump/${DBNAME}.sql" ]
	then
		echo "$DBNAME's backupfile is exist!!"
		echo "You can choose your action"
		echo "[S]kip [B]ackup [O]verwrite"
		Action_Choose $1

	else
		mysqldump -uroot -p$1 $DBNAME > /mnt/mysqldump/${DBNAME}.sql
		echo "$DBNAME is backup in /mnt/mysqldump/${DBNAME}.sql"
	fi
done

安装mariadb服务，进行安全初始化
执行结果：