listen backlog

Eric Wong normalperson at yhbt.net
Sat Dec 4 18:48:33 EST 2010


ghazel at gmail.com wrote:
> On Fri, Dec 3, 2010 at 1:49 PM, Eric Wong <normalperson at yhbt.net> wrote:
> > ghazel at gmail.com wrote:
> >> Using "modprobe inet_diag" made the script spit out a new error:
> >>
> >>             address     active     queued
> >> linux-tcp-listener-stats.rb:42:in `tcp_listener_stats': NLMSG_ERROR
> >> (RuntimeError)
> >>         from linux-tcp-listener-stats.rb:42
> >
> > I don't think I've ever seen NLMSG_ERROR before.  Are you running
> > this as the same user that originally bound the listener (the user
> > of the Unicorn master process)?
> 
> Yes. I also tried as root, same error.
> 
> >> $ sudo modprobe -l inet_diag
> >> /lib/modules/2.6.21.7-2.fc8xen/kernel/net/ipv4/inet_diag.ko
> >>
> >> I dug in to raindrops a little bit, and it seems the error associated
> >> with the NLMSG_ERROR is -2,
> >> "No such file or directory".
> >
> > Are you bound to 0.0.0.0:9000 and not 127.0.0.1:9000?  Use
> > 0.0.0.0:9000 if you're bound to that (I had another user on the
> > raindrops mailing list with that problem).
> 
> My unicorn.rb says 127.0.0.1. But just to test I tried fetching stats
> for 0.0.0.0:9000 but got the same error.

Ah, can you try "modprobe tcp_diag", too?  I can't remember what other
quirks there were for ancient kernels.  Hopefully that works, because
I'd be at a loss otherwise :x

-- 
Eric Wong


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