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使docker使用IPv4进行端口绑定

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问题描述

我有docker主机,里面有一个容器。

docker主机仅绑定IPv6接口上的端口,而不绑定IPv4。

这是输出

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      -

现在我在主机上有40122端口与容器上的端口22链接。

我想要SSH到该容器,但我无法将其唯一绑定到IPv6

这是我的泊坞版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->22/tcp, 0.0.0.0:40280->80/tcp, 0.0.0.0:40543->443/tcp   myapp

我使用docker run -d -P -p 40122:22运行

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

最佳解决方案

正如@ daniel-t在评论中指出:github.com/docker/docker/issues/2174是关于在netstat中仅显示对IPv6的绑定,但这不是问题。正如那个github发布的那样:

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.

换句话说,仅仅因为您将其视为仅IPv6,它仍然能够在IPv4上进行通信,除非您将IPv6设置为仅使用net.ipv6.bindv6only设置绑定到IPv6。要清楚,net.ipv6.bindv6only应为0 – 您可以运行sysctl net.ipv6.bindv6only来验证。

次佳解决方案

设置net.ipv6.conf.all.forwarding = 1将解决问题。为我工作

参考资料

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