This guide will let you configure apcupsd using PCNET broadcasts from the UPS network management card.

Prerequisites:

• EPEL repo
• APC UPS with network management card 2, firmware 6.1.1.

PCNET is UDP broadcast communication over port 3052. If you use a firewall, open communication for this port.

• Configuration → Shutdown, disable Basic Signaling Shutdown.
• Configuration → Shutdown, enter 16 character shutdown phrase.
• Configuration → Shutdown, username: device.
• Configuration → PowerChute clients → add client IP address.

• Install apcupsd.

  yum install apcupsd

• Autostart apcupsd after boot.

  chkconfig apcupsd on

• Configure apcupsd. Edit /etc/apcupsd/apcupsd.conf.

  UPSNAME SMART750
  UPSCABLE ether
  UPSTYPE pcnet
  DEVICE 1.2.3.4:apc:1234567890123456       # Your 16 char shutdown phrase.
  BATTERYLEVEL 10                           # Issue shutdown at or below 10% battery.
  MINUTES 10                                # If runtime left is 10 minutes or below, shutdown.

• Open UDP 3052 from UPS to server. Edit /etc/sysconfig/iptables

  -A INPUT -m state --state NEW -m udp -p udp --dport 3052 -j ACCEPT

• Restart iptables.

  service iptables restart

• SELinux: Allow bind to port 3052. This should be fixed in newer versions of CentOS.

  yum -y install policycoreutils-python
  setenforce 0
  
  # clear the audit log
  cd /var/log/audit
  echo > audit.log
  
  service apcupsd start
  service apcupsd stop
  
  setenforce 1
  
  cp audit.log /var/tmp
  cd /var/tmp
  
  audit2allow -M myapcupsd < audit.log
  
  semodule -i myapcupsd.pp

• Start apcupsd.

  service apcupsd start

• Wait 30 seconds for the PCNET broadcast and test access.

  apcaccess