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Emulab FAQ: Operations and Policy: What does testbed-ops message 'WARNING: power controller(s) failed with exit value N' mean?

Emulab FAQ: Operations and Policy: What does testbed-ops message 'WARNING: power controller(s) failed with exit value N' mean?

If you get an e-mail message with the subject:

EMULAB.NET: WARNING: power controller(s) failed with exit value N

then the "powermon" power controller monitoring program was unable to contact one of the serial line controlled power controllers. This typically means that the serial line capture process on one or more of the controllers has died or gotten hung. Occasionally, this message is generated as the result of a transient error (e.g., someone else is accessing a particular power controller when the monitor tries to do so). To determine that, first do:

wap power status name

If that command fails or hangs, the problem still exists. In this case, you will need to login to the appropriate serial line controlling machine and start or restart the capture process.

You can look in the database "tiplines" table to determine what machine is hosting a particular serial line (if you have multiple serial line hosting machines). Then login and look in /usr/site/etc/capture.rc (Utah) or /usr/local/etc/rc.d/capture.sh (elsewhere) to see the necessary command line for starting the capture process.