使用scp在服务器之间实现自动备份

背景：

（1）工作时的代码都在放在服务器上

（2）服务器不稳定，随时可能当机

所以决定写个shell脚本，自动（每天凌晨）将client服务器上指定的文件夹打包，然后复制到另外一台服务器server上的指定目录下。

话不多说，上代码：

#/bin/sh

#usage
#(1)modify line 10 to line 14 of this script, provide necesary information
#(2)./backup.11 install
#(3)just enjoy it!

#information you must provide
#local directory that should be backup and uploaded
local_files=("/home/raozhengfeng/work/DEV-ICG-z.rao/ADV_PRJ/SCRC_SL/ICG_Prj/DEV/z.rao/MIS" "/home/raozhengfeng/work/NB-projects")
remote_host=109.119.20.11
remote_user=raozhengfeng
#directory on remote server to store bakcup files, which MUST be existed
remote_directory=/home/raozhengfeng/233/

install()
{
        add_cron
        prepare_ssh
}

#generate ssh-key and upload to remote host, so we can use 'scp' util without password
prepare_ssh()
{
        if [ -e "~/.ssh/id_rsa.pub" ]; then
                echo "XXXXXXXXXXXXXXXXXXX"
        else
                ssh-keygen -b 1024 -t rsa -N "" -f ~/.ssh/id_rsa
        fi

        scp ~/.ssh/id_rsa.pub $remote_user@$remote_host:/home/$remote_user/.ssh/authorized_keys
}

#add this script to cron
add_cron()
{
        echo "1 10 * * * "`pwd`"/$0" > $0.cron
        crontab $0.cron
}

#tar and upload local files to remote host
backup()
{
        for _f in ${local_files[@]}
        do
                echo $_f
                #if necessary, we can name the archived file with date
                tar czf $_f.tar.gz $_f
                scp $_f.tar.gz $remote_user@$remote_host:$remote_directory
        done
}

if [ $# -gt 0 ]; then
        if [ $1 = "install" ]; then
                echo "Installing..."
                install
                exit
        fi
fi

backup

使用方法见代码注释。