Red Hat Bugzilla – Bug 848129
apcupsd apparently not listening for connections: apcaccess cannot connect, netstat doesn't show it listening
Last modified: 2012-08-15 15:15:16 EDT
After I updated my desktop to F18, I notice that GNOME doesn't show a battery icon for my UPS any more. Investigating further, although apcupsd is certainly running properly: [root@adam ~]# systemctl status apcupsd.service apcupsd.service - APC UPS Power Control Daemon for Linux Loaded: loaded (/usr/lib/systemd/system/apcupsd.service; enabled) Active: active (running) since Tue, 14 Aug 2012 10:33:34 -0700; 4min 3s ago Process: 8842 ExecStartPre=/bin/rm -f /etc/apcupsd/powerfail (code=exited, status=0/SUCCESS) Main PID: 8845 (apcupsd) CGroup: name=systemd:/system/apcupsd.service └ 8845 /sbin/apcupsd -b -f /etc/apcupsd/apcupsd.conf Aug 14 10:33:35 adam.localdomain apcupsd[8845]: apcupsd 3.14.10 (13 Septembe...d [root@adam ~]# ps aux | grep apcupsd root 8845 0.0 0.0 59160 2620 ? Ssl 10:33 0:00 /sbin/apcupsd -b -f /etc/apcupsd/apcupsd.conf root 9173 0.0 0.0 109172 932 pts/1 S+ 10:37 0:00 grep --color=auto apcupsd [root@adam ~]# apcaccess can't talk to it: [root@adam ~]# apcaccess Error contacting apcupsd @ localhost:3551: Connection refused [root@adam ~]# and indeed, so far as I can tell (I'm terrible at using netstat, but I think I got it right), apcupsd isn't listening on 3551 or indeed any other port: [root@adam ~]# netstat --numeric-ports -a -p | grep apc unix 3 [ ] STREAM CONNECTED 2951055 8845/apcupsd unix 2 [ ] DGRAM 2969015 8845/apcupsd Those are both sockets, no ports are shown.
That's odd, we have the same apcupsd in all Fedora releases. I tested it in Fedora 17 and it works as expected. Could you check if it works after you restart the service? Does it work with SELinux in permissive mode ($ setenfoce 0 ) - maybe it does not allow to open listening port? And also please check if there is anything else using that port: netstat -ln | grep 3551. If nothing of this helps, recheck and attach your apcupsd.conf Thanks
I just tried to reproduce it in virtual machine with fresh F18 and exported usb and it was working fine. Btw, don't forget to check acpupsd service status again after some time. If you start it and check status, it's running (and trying to connect to ups), but if it fails to connect, it gives up after some time. Also it listens on 3551 only when it's connected to ups. So, check apcupsd status again after half a minute and also check /var/log/messages log too.
apcupsd.service - APC UPS Power Control Daemon for Linux Loaded: loaded (/usr/lib/systemd/system/apcupsd.service; enabled) Active: active (running) since Tue, 14 Aug 2012 12:19:08 -0700; 23h ago Main PID: 889 (apcupsd) CGroup: name=systemd:/system/apcupsd.service └ 889 /sbin/apcupsd -b -f /etc/apcupsd/apcupsd.conf Aug 14 12:19:09 adam.localdomain apcupsd[889]: apcupsd 3.14.10 (13 September...d 23 hours running, still not listening anywhere. [root@adam x86_64]# netstat -ln | grep 3551 [root@adam x86_64]# Nothing. Nothing useful in /var/log/messages: Aug 14 12:19:09 adam apcupsd[889]: apcupsd 3.14.10 (13 September 2011) redhat startup succeeded is the sole message from the most recent start of apcupsd. Nothing with 'apc' after that. It was working fine in Fedora 17 before I upgraded (at least, GNOME could see the UPS, I didn't specifically test for a listening port and apcaccess working). I suppose it's possible apcupsd was actually behaving the same in F17 for some reason and GNOME should be able to see the UPS without a TCP/IP port, I can't say I know that for sure. My apcupsd.conf is very standard and hasn't changed since f17, but I'll attach it anyhow.
Ah, d'oh. I have NIS disabled in the config file. So I was looking at the wrong thing; there's no evidence apcupsd is behaving wrong here. I guess I'll have to look at the GNOME end of things instead.