How to make a script running once a day (like a cron job)? - maemo.org

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	jukey	2009-11-30 , 15:13
	Posts: 246 \| Thanked: 204 times \| Joined on Jun 2007 @ Potsdam (Germany)	#1

Hi,

I made a little rsync backup script which syncs the content of a folder on the n900 to a server. This works without a password using public key authentication via ssh.

My question now is: How can I make this little script running once a day? Or maybe once a hour? Is there a recommended solution for this?

Thanks, jukey

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jaark	2009-11-30 , 15:16
Posts: 316 \| Thanked: 150 times \| Joined on May 2006	#2

Isn't cron available on the device?

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	hopbeat	2009-11-30 , 15:20
	Posts: 516 \| Thanked: 643 times \| Joined on Oct 2009 @ Denmark/Poland	#3

Take a look at this

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	Shanezlar	2009-11-30 , 15:23
	Posts: 38 \| Thanked: 67 times \| Joined on Oct 2009 @ Allemagne	#4

For your scenario, you might also want to take a look at Shepherd. But I think it's not quite ready yet.

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	jukey	2009-11-30 , 15:24
	Posts: 246 \| Thanked: 204 times \| Joined on Jun 2007 @ Potsdam (Germany)	#5

Originally Posted by hopbeat

Take a look at this

I'm not really a developer but I'll see if I can get som information out of it.

Thank you!

@jaark: There is a folder /etc/cron.daily but I can't run the command: cron as user or as root.

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CrashandDie	2009-12-01 , 01:15
Posts: 336 \| Thanked: 610 times \| Joined on Apr 2008 @ France	#6

Originally Posted by jukey

Hi,

I made a little rsync backup script which syncs the content of a folder on the n900 to a server. This works without a password using public key authentication via ssh.

My question now is: How can I make this little script running once a day? Or maybe once a hour? Is there a recommended solution for this?

Thanks, jukey

Bit off-topic, but still.

You're using PKI auth without a password? Does the server check the validity of the certificate against a specific authority? If not, how will you be able to blacklist the certificate in case your device is stolen or lost?

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	ewan	2009-12-01 , 01:42
	Posts: 445 \| Thanked: 572 times \| Joined on Oct 2009 @ Oxford	#7

Originally Posted by CrashandDie

Does the server check the validity of the certificate against a specific authority? If not, how will you be able to blacklist the certificate in case your device is stolen or lost?

That's not really how SSH keys work. It doesn't use CAs and automatically trust anything signed by them, a server will trust a list of particular individual keys. If the device holding the private key is compromised you simply remove that particular key from the authorized keys list.

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CrashandDie	2009-12-01 , 01:47
Posts: 336 \| Thanked: 610 times \| Joined on Apr 2008 @ France	#8

Originally Posted by ewan

That's not really how SSH keys work. It doesn't use CAs and automatically trust anything signed by them, a server will trust a list of particular individual keys. If the device holding the private key is compromised you simply remove that particular key from the authorized keys list.

I do realise that, but then you can really only use the key for one specific usage, as having to blacklist the key in several different servers is a security risk (simply put: you might forget one). On the other hand, if you use a different key for each usage, you are at risk of exposing a specific service, because that specific key wasn't blacklisted.

Hence my question, are there any server-side systems that allow to verify an SSH key against an authority (not specifically a CA, rather a key repo?)