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| We use [[http://www.networkupstools.org/|NUT]]. We are monitoring our UPS through the serial port on [[Infrastructure/Gallium.club.cc.cmu.edu|gallium]]. We also run upsmon on the machines that are plugged into the UPS. | We use [[http://www.networkupstools.org/|NUT]]. We also try to run upsmon on the machines that are plugged into the UPS. |
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== Topology == * gallium <-> Rack 0 UPS; APC Smart UPS 2200 XL * ? * argon <-> Rack 7 UPS; IBM RV 3000 * osmium * vanadium * ytterbium * terbium |
We use NUT. We also try to run upsmon on the machines that are plugged into the UPS.
Configuration
The NUT configuration files live in /etc/nut.
Topology
gallium <-> Rack 0 UPS; APC Smart UPS 2200 XL
- ?
argon <-> Rack 7 UPS; IBM RV 3000
- osmium
- vanadium
- ytterbium
- terbium
On gallium
- ups.conf - specifies the UPS name (upsium), driver (apcsmart), and serial port (/dev/ttyS1)
- upsd.conf - specifies access controls to upsd, the main NUT daemon; only allow club hosts to monitor the UPS
- upsd.users - user names, passwords, and privileges for access to upsd
- upsmon.conf - specifies that gallium is the master for monitoring; gives information so upsmon can connect to upsd
In /etc/default/nut, specify START_UPSD=yes and START_UPSMON=yes.
Also one important thing to remember, is that you need a nut user. If you forget, you get the helpful error message "getpwnam(nut): Success" (at least in the sarge version).
nut:x:50:104::/var/lib/nut:/bin/false
On others
- upsmon.conf - specifies that the upsd on gallium should be monitored; gives information so upsmon can connect to the upsd on gallium
In /etc/default/nut, specify START_UPSMON=yes.
How It Handles Issues
TODO: kbare - verify this is true.
When the battery level of the UPS becomes critical, the upsmon processes will notice, and initiate a system shutdown. The master will wait for all of the slaves to shut down, and then it will shut itsefl down, and power off the UPS.