Ssh-cron is a cron-daemon supporting connections to other computers using ssh-keys requiring passphrases
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ssh-cron
README
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README

Ssh-cron is a cron daemon allowing connections to remote computers requiring
the use of ssh keys with passphrases.

Ssh-cron acts like cron, but utilizes ssh-agent to obtain ssh key
passphrases. Thus it allows scheduled commands to run on remote systems
without requiring the ssh key passphrase to be stored in a clear-text file, or
resorting to ssh keys without passphrases.

Consider the situation where a computer every now and then must access a
remote computer to do some useful things at that remote computer (like running
a stealth(1) file integrity scan). In order to do so the computer must be
allowed to make ssh(1) connections to the remote computer.  But since the
commands are not executed by the user but by cron(1), the ssh-keys which are
required to access the remote computer cannot use passphrases.

This is an undesirable situation: if the computer running the ssh commands
gets compromised, then the remote computers are compromised as well, since the
attacker may access these remote systems using ssh keys not requiring pass
phrases.

Ssh-Cron offers a way out of this undesirable  situation,  while  still
allowing  commands  to be executed on remote computers.


To create the program from its sources, either descend into the ssh-cron
directory, or unpack a created archive, cd into its top-level directory 
and follow the instructions provided in the INSTALL file found there.

Alternatively, binary ready-to-install versions of ssh-cron are available in
verious Linux distributions, in particular Debian. See, e.g.,
https://packages.debian.org/search?keywords=ssh-cron&searchon=names&suite=all&section=all

Github's web-pages for ssh-cron are here:
https://fbb-git.github.io/ssh-cron/