APC SU1400XLT User Manual download pdf (Page 34)

server decides to shutdown and the time it no longer responds. Your slave must poll during this interval.

Any client run using the Net driver will shutdown when its own timers expire or when the NIS server shuts

down, whichever occurs first. This means that if you want the slave to shutdown before the server, you

need only set BATTERYLEVEL, MINUTES or TIMEOUT on the client for a faster shutdown than the values

defined on the NIS server. This can often be useful if the slave is less important than the master and you

wish to reduce battery power consumption so that the master can remain up longer during a power

outage.

NIS clients work principally by reading the STATFLAG record that is sent by the NIS server (present in the

output of apcaccess). The low 16 bits are the standard APC status flag, and the upper 16 bits represent

the internal state of apcupsd, so the slave can see when the power fails and know when to shutdown.

It would be possible to have a client also work as a server, but that would increase the delay of

information getting from the UPS to the secondary client.

Differences between NIS Client/Server and the old (now removed) Master/Slave modes

The difference between the NIS mode and the removed master/slave mode is that the NIS server has no

explicit knowledge of the slaves. The NIS server makes its information available via the net (NIS), and the

NIS slaves read it. When the NIS server is going to shutdown, it makes the information available to any

NIS slave that polls it, but the NIS server does not explicitly call each NIS slave as is the case in the

Master/Slave networking described several sections above.

Think of the difference as push (Master/Slave) vs. pull (NIS-based). In the case of M/S, the master makes

all the shutdown decisions and notifies the slaves when they are to shut down or when some other

interesting event happens. The slaves just do whatever the master says, whenever the master says to. On

the other hand, with the NIS-based network config you basically "publish" the UPS status from one server

and then your clients view that status and make their own decisions.

PowerChute Network Shutdown Driver (PCNET)

As of 3.14, Apcupsd supports the PowerChute Network Shutdown protocol. This is an alternative to

SNMP for use with APC's AP9617 family of network smartslot modules. Note that the older AP9606

modules do not support PCNET.

To enable PCNET support, configure with the --enable-pcnet flag. This is typically enabled by

default.

The required apcupsd.conf settings are straightforward:

## apcupsd.conf v1.1 ##

UPSCABLE ether

UPSTYPE pcnet

LOCKFILE /var/lock

DEVICE ipaddr:user:passphrase

UPSCLASS standalone

UPSMODE disable

The DEVICE setting specifies the IP address of the UPS as well as the username and authentication

passphrase to use. Note that the username and passphrase are not the Web/SNMP login credentials.

They are separate settings. The default username on a new card is "apc" and the default passphrase is

"admin user phrase". To change the passphrase, log in to the Web UI and go to the UPS tab, then to

PowerChute -> Configuration. (This assumes firmware v3.3.1. Other versions may place the setting

elsewhere.) The password must be a minimum of 15 characters long. The web UI will silently ignore

shorter passwords and does not give an error message. There is no apparent way to change the

username.

Note that you may leave DEVICE blank and Apcupsd will accept information from any PCNET UPS on

the network, however it will be very insecure since an attacker could easily send packets crafted to

cause your server to shut down. Using the ipaddr, user, and passphrase will prevent this

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