Hey! Linux.

之前发生过几次VPS宕机的故障，经询问托管商，解释是宿主机硬盘出问题，好在数据都在存储上，没有大碍。但却给自己敲了一个警钟，那就是得自己做好VPS的数据备份，尤其是Blog的目录和数据库。
但是VPS远在美国，手动下载备份文件速度会非常慢，于是我想到了Dropbox，它是目前美国名气最大的免费网络硬盘站点，在经过了一系列的搜索和失败的尝试之后，我终于发现了一个Shell脚本，无需安装任何Dropbox客户端程序，就可以实现自动备份VPS数据到Dropbox的功能。

相关截图如下
执行脚本后的显示：

在Dropbox中成功备份：

以下便是脚本的相关内容：
# vim DropboxBackup.sh
# chmod +x DropboxBackup.sh
# crontab -e //设置为每个月执行一次备份，具体时间可以根据需要进行修改
00 02 1 * * /bin/bash /home/rainbow/DropboxBackup.sh

#!/bin/bash
DROPBOX_USER="guosuiyu@gmail.com" //Dropbox的账号
DROPBOX_PASS="12345678" //Dropbox的密码
DROPBOX_DIR="/backups" //Dropbox中的文件夹名称
BACKUP_SRC="/blog/rainbow /home /data" //需要备份的文件夹路径，可以同时指定多个
BACKUP_DST="/home/rainbow/backup" //用来存放备份的文件夹路径
MYSQL_SERVER="127.0.0.1" //连接本地MySQL
MYSQL_USER="root" //本地MySQL的用户
MYSQL_PASS="12345678" //本地MySQL的密码

#
# Stop editing here.
NOW=$(date +"%Y.%m.%d")
DESTFILE="$BACKUP_DST/$NOW.tgz"

#
# Upload a file to Dropbox.
# $1 = Source file
# $2 = Destination file.
function dropboxUpload
{
        #
        # Code based on DropBox Uploader 0.6 from http://www.andreafabrizi.it/?dropbox_uploader
        LOGIN_URL="https://www.dropbox.com/login"
        HOME_URL="https://www.dropbox.com/home"
        UPLOAD_URL="https://dl-web.dropbox.com/upload"
        COOKIE_FILE="/tmp/du_cookie_$RANDOM"
        RESPONSE_FILE="/tmp/du_resp_$RANDOM"

    UPLOAD_FILE=$1
    DEST_FOLDER=$2

        # Login
        echo -ne " > Logging in..."
        curl -s -i -c $COOKIE_FILE -o $RESPONSE_FILE --data "login_email=$DROPBOX_USER&login_password=$DROPBOX_PASS&t=$TOKEN" "$LOGIN_URL"
        grep "location: /home" $RESPONSE_FILE > /dev/null

        if [ $? -ne 0 ]; then
                echo -e " Failed!"
                rm -f "$COOKIE_FILE" "$RESPONSE_FILE"
                exit 1
        else
                echo -e " OK"
        fi

        # Load home page
        echo -ne " > Loading Home..."
        curl -s -i -b "$COOKIE_FILE" -o "$RESPONSE_FILE" "$HOME_URL"

        if [ $? -ne 0 ]; then
                echo -e " Failed!"
                rm -f "$COOKIE_FILE" "$RESPONSE_FILE"
                exit 1
        else
                echo -e " OK"
        fi

        # Get token
        TOKEN=$(cat "$RESPONSE_FILE" | tr -d '\n' | sed 's/.*<form action="https:\/\/dl-web.dropbox.com\/upload"[^>]*>\s*<input type="hidden" name="t" value="\([a-z 0-9]*\)".*/\1/')

        # Upload file
        echo -ne " > Uploading '$UPLOAD_FILE' to 'DROPBOX$DEST_FOLDER/'..."
    curl -s -i -b $COOKIE_FILE -o $RESPONSE_FILE -F "plain=yes" -F "dest=$DEST_FOLDER" -F "t=$TOKEN" -F "file=@$UPLOAD_FILE"  "$UPLOAD_URL"
    grep "HTTP/1.1 302 FOUND" "$RESPONSE_FILE" > /dev/null

    if [ $? -ne 0 ]; then
        echo -e " Failed!"
                rm -f "$COOKIE_FILE" "$RESPONSE_FILE"
        exit 1
    else
        echo -e " OK"
                rm -f "$COOKIE_FILE" "$RESPONSE_FILE"
    fi
}

# Backup files.
echo "Dumping databases..."
mysqldump -u $MYSQL_USER -h $MYSQL_SERVER -p$MYSQL_PASS --all-databases > "$NOW-Databases.sql"
echo "Packing files..."
tar czf "$DESTFILE" $BACKUP_SRC "$NOW-Databases.sql"

dropboxUpload "$DESTFILE" "$DROPBOX_DIR"

echo "Cleaning the backups..."
rm -f "$NOW-Databases.sql"
find $BACKUP_DST -mtime +31 -delete //这里的时间可以根据需要进行修改

参考资料：http://davehope.co.uk/Blog/backup-your-linux-vps-to-dropbox/