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List: nsd-users
Subject: [nsd-users] Address already in use if using same -a and ip-address
From: "Jeremy C. Reed" <jreed () isc ! org>
Date: 2009-09-16 15:14:59
Message-ID: alpine.NEB.2.01.0909160949480.2006 () t1 ! m ! reedmedia ! net
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nsd -a 127.0.0.1 -c nsd.conf -P nsd.pid -p 15353 -u jreed
And nsd.conf had:
ip-address: 127.0.0.1
port: 15353
Sep 15 13:57:18 bind10-testing1 nsd[25334]: can't bind udp socket: Address already in \
use
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
fcntl(3, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
bind(3, {sa_family=AF_INET, sin_port=htons(15353), sin_addr=inet_addr("127.0.0.1
")}, 16) = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
fcntl(4, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
bind(4, {sa_family=AF_INET, sin_port=htons(15353), sin_addr=inet_addr("127.0.0.1
")}, 16) = -1 EADDRINUSE (Address already in use)
open("/etc/localtime", O_RDONLY) = 5
If on command line and also in config file, it attempts to bind to it
twice.
If that is expected, it is not intuitive. I'd assume that the command-line
arguments override the configuration file. My workaround was to comment
out the ip-address: in my configuration or don't use the -a option.
This is inconsistent. (If I am reading code correctly...) here are two
examples:
- nodes array is all set to nothing.
- nodes is set for each -a argument, nsd.ifs is increment for each
- then options are read and nodes is set for each ip-address
(I'd suggest that if -a is used then don't use from config.)
- udp_port set to nothing
- udp_port is set to -p argument
- if udp_port was not set to -p argument, then set to port from
conf options
- if no conf options for port, then set to default 53
> From looking at code, I see some command line options to override the
nsd.conf options. Please be clear in man pages which ones do this.
And maybe be useful to warn about it also, like:
log_msg(LOG_WARNING, "Not using foo from configuration. Using command-line argument \
instead to override.");
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