macos - rsync over SSH with cron in osx-environment

I want to automatically download files and folders from a Linux server to which I have an SSH (and FTP) account. The files shall be downloaded on a regular basis (I suppose a cron is the right tool to do so) onto an OS X machine.

I tried the following rsync command, which works fine:

rsync -avzbe ssh account@server.tld:/www/htdocs/something/somefolder /Users/me/folder/foo/

However I have to enter the account's password every time (the SSH account on the server machine). The server is a managed one and I'm afraid I can't change the password.

Here are my questions:

• How do I bypass the entering of the password by storing it somewhere


• How do I automate this then correctly?

Answer

1. Run ssh-keygen and accept the defaults in every step


2. cat ~/.ssh/id_rsa.pub | ssh username@host.com "mkdir -p ~/.ssh/; cat >> ~/.ssh/authorized_keys; chmod 700 ~/.ssh/; chmod 600 ~/.ssh/authorized_keys"


3. Edit the crontab with crontab -e and add a line like 20 4,16 * * * rsync -a someuser@somehost.com:somedir/subdir ~/somedir