Ubuntu – Using a APC Smart-UPS to shutdown a Ubuntu Server Cluster

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I'm currently in the process of designing a solution to shutdown a two Ubuntu Server cluster that uses heartbeat and DRBD to replicate storage and offer a NFS share to some IP cameras.

We want to integrate a UPS into the system so the servers will shutdown gracefully. I'm currently looking into the APC Smart-UPS C 1000VA 2U LCD 120V UPS and using Apcupsd to shutdown the servers in the event of a power outage.

Is this idea possible? I'm reading through the documentation right now. If you guys have any better ideas I'm open for suggestions.

Best Answer

You could use Network UPS Tools aka NUT instead of apcupsd to gracefully shut down a cluster of machines. One machine would be the 'master' connected to the UPS serial/USB/SNMP/whatever port, the rest 'slaves' connected to the master. If power fails, the master tells the slaves to shut down.

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Use the at command ? I'm a similar way to terdons answer but used instead of sleep. It doesn't require your shell to be left open

Echo "shutdown -h 00:00"|at now + 2 days

For example

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If you are just on the command line, removing the user from the sudo/admin/wheel group may be enough since shutdown, poweroff and reboot need root privileges.

If we are talking about desktop sessions (or sessions otherwise handled by login managers such as consolekit or logind), this may become a little more complicated. In this case adjust your system's polkit rules as described here (or create them if they don't exist): https://askubuntu.com/questions/93542/how-to-disable-shutdown-reboot-suspend-hibernate

But make sure, the user you want to restrict has no other method of gaining root access (i.e. you also need to prevent him from using sudo). Otherwise he can just override or change these settings.

Edit: for a more up to date example with new JS config format, see https://wiki.archlinux.org/index.php/Polkit#Disable_suspend_and_hibernate

If you are using systemd (probably not when this is about Ubuntu), the action ids may also be different (starting with org.freedesktop.login1.xxx instead of org.freedesktop.consolekit.xxx). For a list of logind actions, have a look at https://www.freedesktop.org/wiki/Software/systemd/logind/

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