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-   -   Automatic shutdown using ping (

amelieo 04-18-2004 03:58 AM

Automatic shutdown using ping
Hi all,

I have set up a Linux server to serve various devices (i.e. MP3 playback in the living room). The server automatically starts up using wake on LAN.

I would like the server to shutdown automatically as well. I think about a script using "ping" to check if any of the served devices is up (using a list of IP addresses) and shutting down when none is available for 15 minutes.

Did anybody already do this or has another solution and can provide a matching script?

demian 04-20-2004 08:46 AM

Not sure if ping is the right solution. A lot of services use icmp to check availability of a host so this could result in the server going down randomly. I once read a LJ article on port knocking. The idea is to parse the firewall logs for a certain knock sequence and then take appropriate action. Like opening up a port or something. This sure can be expanded to call shutdown on receiving a predefined shutdown knock sequence.

Here's the article:

oops. I guess I misread your question as well. The keyword being automatically shut down the server... Yeah, then the port knocking thing is not such a good idea.

JJX 04-20-2004 09:01 AM

wrong - i misunderstood what u asked :(

BIACS 04-20-2004 10:37 AM

Does your distro and hardware support ACPI? You could just use that and set the monitor, HD, and system to shut down after 15 min inactivity.

amelieo 04-24-2004 04:59 AM

Thanks for all the replies.

I do not think ACPI will do the job since there is no way to define "system activity" as "is the server serving any clients". As far as I know it rather reacts on mouse and keyboard activity. I can use it the stop the HD when it is not accessed and thereby saving some energy and reducing noise, so thanks for that idea.

What I am looking for is completely shutting down the system when it is not needed. And for my purpose not needed means that no potential clients are up and running. That's why I thought ping might be the solution.

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