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I want to shut down another computer in my network when shutting down my own.

For that I have created a script that logs into that machine through ssh and powers it off. (SSH keys are set up, so no need for password.)

#! /bin/sh
ssh user@remote sudo halt

And placed it in /etc/init.d.

Then I created two symlinks pointing to this file under rc0.d and rc6.d called K10haltremote.sh.

If I call the script manually it works as expected, but when shutting down or rebooting my machine does not have any effect on the remote one.

The only thing I can figure out is that shutdown is too fast, and there is not time for the ssh connection, but it's only a guess.

Any ideas?

  • Did you check the order of scripts being executed during shutdown? maybe your network connection is cut before the ssh command? As a test you could let your script a) write random text to a file to see if it really is executed, b) make the script do a network test (ifconfig output, ping whatever) and write the output to a file, so that you know if you still have an active network connection during script execution. – Fiximan Jul 29 '15 at 9:19
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    Many thanks. Outputting some info in a txt file I realised the file was created by su instead of my user, and helped to solve my problem. – Josep Bosch Jul 29 '15 at 10:54
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ssh user@remote sudo halt & sleep 10
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Solved. The thing I didn't take into account is that the script is exectuted as root and not with my user. So when running ssh, password is required as I only set up the keys for my user. The workaround I used is forcing ssh to use my user keys:

ssh -i /home/user/.ssh/id_rsa user@remote sudo halt

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