98: Address already in use

Igor Sysoev igor at sysoev.ru
Fri Apr 15 10:30:27 MSD 2011

On Thu, Apr 14, 2011 at 08:04:03AM -0400, slowgary wrote:
> Hi all,
> Nginx has been working fine for months on my server. Recently, however,
> I see that "service nginx configtest" reports the following:
> the configuration file /etc/nginx/nginx.conf syntax is ok
> [emerg]: listen() to, backlog 511 failed (98: Address
> already in use)
> configuration file /etc/nginx/nginx.conf test failed
> I believe nginx has been updated recently, but I'm not sure.  It's
> currently at version 0.8.53.  I've ran configtest before and have never
> seen this error.  I need to add a new site in conf.d, but I fear that
> reloading or restarting afterwards will fail and my live sites will be
> down.
> netstat -tlnp lists as in use by Program name "nginx.conf"
> (which seems weird, shouldn't this just say "nginx").  Also, if I rename
> the conf.d/site.conf file that includes the 17942 port entry, it just
> fails on the next conf down the line on the following ip/port.
> Now that I've typed out the entire problem, it occurs to me that the
> problem could be the misnamed Program name.  Maybe nginx thinks that a
> different program is occupying those ports because the name is not
> "nginx".  Does that seem likely?  Also, was there a bug fixed somewhere
> that resolved/caused the name change?  I have a hunch that restarting
> nginx will solve the problem, but I don't want to risk it since it's a
> live server.

Could you show output of
ps ax -o pid,ppid,%cpu,vsz,wchan,command|egrep '(nginx|PID)'

Igor Sysoev

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