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See also:
- Linux Overview
- Various Linux Distros (distributions)
- Documentation about Linux
- Building Routers with Linux
- Running off a Flash Drive
- Linux and SAMBA
- Installing Debian 4 Linux on a RAID Array
- Replacing a Windows NT4 Server
- Configuring Debian 3.1 (Sarge)
apcupsd
A package called apcupsd can be used with Debian Etch to provide monitoring of an APC Back-UPS ES UPS via a USB cable, I tried this with a BE550R bought in Dec'07 (this model has user changeable batteries which Insight.ca stocks). You need to get the package:apt-get install apcupsdand then configure it. The instructions on the apcupsd are a bit confusing, until you read this article, where it tells you the configuration file is:
/etc/apcupsd/apcupsd.confand that in the second config file: /etc/default/apcupsd you only need to edit the ISCONFIGURED line to read Yes.
In the apcupsd.conf file you will need to set the following lines like this:
UPSCABLE usb UPSTYPE usb DEVICEThen you should be able to connect the UPS with the USB cable, and start the monitor with:
/etc/init.d/apcupsd startDo a:
cat /var/log/apcupsd.eventsto look for any errors. Once it is running you can look for more information with the command:
apcaccesswhich will print out a couple of screens of information on the UPS state.
To test this, plug the UPS into a switched powerbar and then you can turn the power to the UPS off and on and check that the computer gets shutdown at the appropriate time. The apcaccess command returns a fair bit of information, in the middle of this the following appears:
STATUS : ONLINE LINEV : 121.0 Volts LOADPCT : 25.0 Percent Load Capacity BCHARGE : 082.0 Percent TIMELEFT : 16.8 Minutestelling you the state of charge of the battery, the current load and the amount of time the UPS could power the current load. Since this is a 330W UPS, the load is drawing about 82W currently. This load consists of a small Linux server built around a mini-ITX motherboard and two 300GB drives in a RAID-1 configuration, a DSL modem, a Linksys gateway router with an integrated 8 port 100MHz switch and a Netgear 8 port gigabit switch.