ipv4 & ipv6 Virtual Hosting - address in use

[petteyg359]

Linux 2.6.34-gentoo-r12 x86_64 Intel(R) Core(TM) i7 CPU 930 @ 2.80GHz
GenuineIntel GNU/Linux
 # nginx -V
nginx version: nginx/0.8.53
TLS SNI support enabled
configure arguments: --prefix=/usr --sbin-path=/usr/sbin/nginx
--conf-path=/etc/nginx/nginx.conf
--error-log-path=/var/log/nginx/error_log --pid-path=/var/run/nginx.pid
--lock-path=/var/lock/nginx.lock --user=nginx --group=nginx
--with-cc-opt=-I/usr/include --with-ld-opt=-L/usr/lib
--http-log-path=/var/log/nginx/access_log
--http-client-body-temp-path=/var/tmp/nginx/client
--http-proxy-temp-path=/var/tmp/nginx/proxy
--http-fastcgi-temp-path=/var/tmp/nginx/fastcgi
--http-scgi-temp-path=/var/tmp/nginx/scgi
--http-uwsgi-temp-path=/var/tmp/nginx/uwsgi --with-ipv6 --with-pcre
--without-http_autoindex_module --without-http_browser_module
--without-http_charset_module --without-http_geo_module
--without-http_map_module --without-http_memcached_module
--without-http_referer_module --without-http_ssi_module
--without-http_split_clients_module --without-http_userid_module
--with-http_realip_module --with-http_ssl_module
--without-mail_imap_module --without-mail_pop3_module
--without-mail_smtp_module

server {
listen [::]:80 default_server;
listen 80 default_server;
return 444;
}
#According to docs, this config should fail, because without
ipv6only=on,
#this line should automatically listen on ipv4 interfaces also.
 # netstat -lp | grep nginx
tcp        0      0 *:http                  *:*                    
LISTEN      31704/nginx.conf
tcp6       0      0 [::]:http               [::]:*                 
LISTEN      31704/nginx.conf

server {
listen [::]:80 default_server ipv6only=on;
return 444;
}
#I remove the listen 80 line, and add ipv6only=on
 # /etc/init.d/nginx start
 * Checking nginx' configuration ...
the configuration file /etc/nginx/nginx.conf syntax is ok
configuration file /etc/nginx/nginx.conf test is successful             
                                                                        
                                                       [ ok ]
 * Starting nginx ...
[emerg]: bind() to [2a01:4f8:130:9101::3]:80 failed (98: Address already
in use)
[emerg]: bind() to [2a01:4f8:130:9101::3]:80 failed (98: Address already
in use)
[emerg]: bind() to [2a01:4f8:130:9101::3]:80 failed (98: Address already
in use)
[emerg]: bind() to [2a01:4f8:130:9101::3]:80 failed (98: Address already
in use)
[emerg]: bind() to [2a01:4f8:130:9101::3]:80 failed (98: Address already
in use)
[emerg]: still could not bind()
 * start-stop-daemon: failed to start `/usr/sbin/nginx'
 * Failed to start nginx                                                
                                                                        
                                                       [ !! ]
 * ERROR: nginx failed to start

Not only does it not work as described, it seems to be trying to bind a
specific address multiple times, and maybe succeeding the first time,
because there's nothing else running on any interface port 80, so it
fails since it can't successfully bind the same address a second time.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,154862,161461#msg-161461