id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
1821	Nginx 1.14.0 fails to start if ipv6 support on host is disabled	bevand10@…		"# ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.249.1  netmask 255.255.255.0  broadcast 192.168.249.255
        ether 02:42:19:ba:e6:23  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

docker_gwbridge: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.250.1  netmask 255.255.255.0  broadcast 192.168.250.255
        ether 02:42:19:d7:3f:8e  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1033  bytes 172294 (172.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp0s31f6: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether c8:d3:ff:69:38:89  txqueuelen 1000  (Ethernet)
        RX packets 1334863  bytes 1058768699 (1.0 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 380949  bytes 134078135 (134.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16  memory 0xe1200000-e1220000  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 4019381  bytes 2054803911 (2.0 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4019381  bytes 2054803911 (2.0 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

veth3b18948: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether ba:7a:7f:04:bc:2d  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1033  bytes 172294 (172.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.56.110.15  netmask 255.255.252.0  broadcast 10.56.111.255
        ether f0:d5:bf:01:b7:4c  txqueuelen 1000  (Ethernet)
        RX packets 17897545  bytes 13685388137 (13.6 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5316328  bytes 1206667801 (1.2 GB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: [emerg] socket() [::]:80 failed (97: Address family not supported by protocol)
nginx: configuration file /etc/nginx/nginx.conf test failed


Fragment from /etc/nginx/sites-enabled/default

server {
	listen 80 default_server;
	listen [::]:80 default_server;

If I comment out the listen [::]:80 ipv6 directive, nginx starts successfully.

This appears to be a recent regression, as previously, the default presence of the listen ipv6 directive, and absence of ipv6 support on the host, would not result is a nginx start error."	defect	closed	minor		other	1.17.x	invalid			Linux bevand10-HP-EliteBook-840-G3 4.15.0-54-generic #58-Ubuntu SMP Mon Jun 24 10:55:24 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.14.0 (Ubuntu)
built with OpenSSL 1.1.1  11 Sep 2018
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fdebug-prefix-map=/build/nginx-pTuC1b/nginx-1.14.0=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_geoip_module=dynamic --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_sub_module --with-http_xslt_module=dynamic --with-stream=dynamic --with-stream_ssl_module --with-mail=dynamic --with-mail_ssl_module"