Make docker use IPv4 for port binding

Question

I have docker host and inside I have one container   The docker host is binding the port on IPv6 interface only  not on IPv4   This is the output  tcp        0      0 0 0 0 0 22              0 0 0 0                 LISTEN      - tcp        0      0 0 0 0 0 55082           0 0 0 0                 LISTEN      - tcp        0      0 0 0 0 0 111             0 0 0 0                 LISTEN      - tcp6       0      0    80                                           LISTEN      - tcp6       0      0    22                                           LISTEN      - tcp6       0      0    40280                                        LISTEN      - tcp6       0      0    5432                                         LISTEN      - tcp6       0      0    40122                                        LISTEN      - tcp6       0      0    36378                                        LISTEN      - tcp6       0      0    40543                                        LISTEN      - tcp6       0      0    111                                          LISTEN      -   Now I have 40122 port on host to link with port 22 on container   I want to SSH into that container but I am not able to as its only bound to IPv6  This is my docker version  Docker version 1 5 0  build a8a31ef  docker ps  201bde6c839a        myapp latest    supervisord -n     3 weeks ago         Up 2 hours          0 0 0 0 40122- gt 22 tcp  0 0 0 0 40280- gt 80 tcp  0 0 0 0 40543- gt 443 tcp   myapp   I ran using   docker run -d -P -p 40122 22  netstat -tlna  tcp        0      0 0 0 0 0 80              0 0 0 0                 LISTEN tcp        0      0 0 0 0 0 22              0 0 0 0                 LISTEN tcp        0      0 127 0 0 1 3031          0 0 0 0                 LISTEN tcp        0      0 0 0 0 0 6379            0 0 0 0                 LISTEN tcp6       0      0    22                                           LISTEN tcp6       0      0    6379                                         LISTEN   ps aux  root         1  0 0  0 8  52440 16668          Ss   00 53   0 03  usr bin python  usr bin supervisord -n root        49  0 0  0 1  17980  3048          S    01 32   0 00 bash root        64  0 0  0 1  46632  2712          S    01 32   0 00 su -l vagrant vagrant     65  0 0  0 1  21308  3760          S    01 32   0 00 -su root       288  0 0  0 1  17980  3088          S    02 01   0 00 bash root       304  0 0  0 1  46632  2720          S    02 01   0 00 su -l vagrant vagrant    305  0 0  0 1  21304  3804          S    02 01   0 00 -su vagrant    308  0 0  3 7 429616 75840          Sl   02 01   0 05 python   manage py shell plus root       654  0 0  0 4  47596  9848          S    03 12   0 01  usr local bin uwsgi --die-on-term --ini  var www conf uwsgi ini root       655  0 0  0 3  90280  7732          S    03 12   0 00 nginx  master process  usr sbin nginx www-data   656  0 0  0 1  90600  3624          S    03 12   0 00 nginx  worker process www-data   657  0 0  0 1  90600  3624          S    03 12   0 00 nginx  worker process www-data   658  0 0  0 1  90600  3624          S    03 12   0 00 nginx  worker process www-data   659  0 0  0 2  90940  4500          S    03 12   0 00 nginx  worker process root       660  0 0  0 2  61372  5332          S    03 12   0 00  usr sbin sshd -D root       669  0 0  0 4  37004  8892          Sl   03 12   0 01 redis-server   6379 root       856  8 0  2 8 388720 57792          Sl   04 07   0 18  usr local bin uwsgi --die-on-term --ini  var www conf uwsgi ini root       857  8 0  2 8 388720 57792          Sl   04 07   0 18  usr local bin uwsgi --die-on-term --ini  var www conf uwsgi ini root       858  8 0  2 8 388720 57792          Sl   04 07   0 18  usr local bin uwsgi --die-on-term --ini  var www conf uwsgi ini root       859  8 0  2 8 388720 57792          Sl   04 07   0 18  usr local bin uwsgi --die-on-term --ini  var www conf uwsgi ini vagrant    889  0 0  0 1  18692  2508          R    04 11   0 00 ps aux

User · Answer

ISSUE RESOVLED  USE docker run -it -p 80 80 --name nginx --net host -d nginx that s issue we face with VM some time instead of bridge network try with host that will work for you  tcp     0    0 0 0 0 0 80            0 0 0 0               LISTEN      -  tcp6    0    0    80                                       LISTEN      -

User · Answer

Setting net ipv6 conf all forwarding 1 will fix the issue   This can be done on a live system using sudo sysctl -w net ipv6 conf all forwarding 1

User · Answer

As  daniel-t points out in the comment  github com docker docker issues 2174 is about showing binding only to IPv6 in netstat  but that is not an issue  As that github issues states       When setting up the proxy  Docker requests the loopback address  127 0 0 1   Linux realises this is an address that exists in IPv6  as   0  and opens on both  but it is formally an IPv6 socket   When you run netstat it sees this and tells you it is an IPv6 - but it is still listening on IPv4  If you have played with your settings a little  you may have disabled this trick Linux does - by setting net ipv6 bindv6only   1    In other words  just because you see it as IPv6 only  it is still able to communicate on IPv4 unless you have IPv6 set to only bind on IPv6 with the net ipv6 bindv6only setting  To be clear   net ipv6 bindv6only should be 0 - you can run sysctl net ipv6 bindv6only to verify

User · Answer

For CentOS users  I ve got same issue on CentOS7 and setting net ipv4 ip forward to 1 solves the issue  Please  refer to Docker Networking Disabled  WARNING  IPv4 forwarding is disabled  Networking will not work for more details

User · Answer

By default  docker uses AF INET6 sockets which can be used for both IPv4 and IPv6 connections  This causes netstat to report an IPv6 address for the listening address   From RedHat https   access redhat com solutions 3114021

User · Answer

If you want your container ports to bind on your ipv4 address  just      find the settings file    etc sysconfig docker-network on RedHat alike  etc default docker-network on Debian ans alike   edit the network settings    add DOCKER NETWORK OPTIONS -ip xx xx xx xx xx xx xx xx being your real ipv4  and not 0 0 0 0   restart docker deamon   works for me on docker 1 9 1

[ubuntu] Make docker use IPv4 for port binding

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