blocks|key|2858340|text|借用SDN+hub的模式，假设C1是SVN容器，C2是Mongo容器：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2858341|​|2858342|📷|atomic|2858343|2858344|两个容器都连接到docker0桥，NATed连接到外部192.168.50.16网络。|style|CODE|2858345|要从您的Mongo容器连接，请检查SVN容器的bridge0+IP地址：|2858346|#+docker+inspect+<svn-container-name>

++++++++"Networks":+{
++++++++++++"bridge0":+{
++++++++++++++++"IPAddress":+"172.17.0.19",
++++++++++++}|code-block|syntax|javascript|2858347|然后直接卷曲到它的bridge0+IP地址：|2858348|curl+http://172.17.0.19:18080/|2858349|entityMap|0|LINK|mutability|MUTABLE|url|http://sdnhub.org/tutorials/docker-networking/|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/8797e1be96033f7e39d8d612bf0778a8.png|imageAlt^0|2|7|0|0|0|0|1|1|0|0|8|7|0|N|7|0|0|9|7|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@$A|1D|B|1E|1|1F]]|C|$]]|$1|D|3|E|5|6|7|1G|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1H|8|@]|9|@$A|1I|B|1J|1|1K]]|C|$]]|$1|I|3|E|5|6|7|1L|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1M|8|@$A|1N|B|1O|L|M]]|9|@]|C|$]]|$1|N|3|O|5|6|7|1P|8|@$A|1Q|B|1R|L|M]]|9|@]|C|$]]|$1|P|3|Q|5|R|7|1S|8|@]|9|@]|C|$S|T]]|$1|U|3|V|5|6|7|1T|8|@$A|1U|B|1V|L|M]]|9|@]|C|$]]|$1|W|3|X|5|R|7|1W|8|@]|9|@]|C|$S|T]]|$1|Y|3|-4|5|6|7|1X|8|@]|9|@]|C|$]]]|Z|$10|$5|11|12|13|C|$14|15]]|16|$5|17|12|18|C|$19|1A|1B|-4]]]]

Borrowing this schema from <a href="http://sdnhub.org/tutorials/docker-networking/" rel="nofollow noreferrer">SDN hub</a>, imagine that C1 is your SVN container and C2 is your Mongo container:

<a href="https://i.stack.imgur.com/c6L47.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/c6L47.png" alt="Docker network"></a>

Both containers are connected to <code>docker0</code> bridge and NATed to external 192.168.50.16 network.

To connect from your Mongo container, check the <code>bridge0</code> IP address of the SVN container:

<pre><code># docker inspect &lt;svn-container-name&gt;

 "Networks": {
 "bridge0": {
 "IPAddress": "172.17.0.19",
 }
</code></pre>

then CURL directly to it's <code>bridge0</code> IP address:

<pre><code>curl http://172.17.0.19:18080/
</code></pre>

blocks|key|4325187|text|为了让您立即开始，您可以使用--net=host开始您的主机，然后容器和主机将能够通信。或者，您可以在mongo与其他容器之间使用link(+--link+)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4325188|关于docker网络有很多需要解释的地方，docker文档将是一个很好的起点。|4325189|请阅读https://docs.docker.com/engine/userguide/networking/dockernetworks/上的文档|offset|length|4325190|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.docker.com/engine/userguide/networking/dockernetworks/^0|0|0|3|1V|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

To get you immediately going, you can start your hosts with --net=host and then both containers and host will be able to communicate.
Or you can use link( --link ) between from mongo to the other container.

There is lot to explain about docker networking and the docker documentation will be good point to start.

Read the documentation at <a href="https://docs.docker.com/engine/userguide/networking/dockernetworks/" rel="nofollow">https://docs.docker.com/engine/userguide/networking/dockernetworks/</a>

blocks|key|2858251|text|我建议你看看docker+compose。我认为这是管理由许多容器组成的系统的最好方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2858252|以下是官方指南：https://docs.docker.com/compose/|offset|length|2858253|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.docker.com/compose/^0|0|8|W|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I would advice you to take a look at docker compose. I think it's the best way to manage a system, which is composed of many containers.

Here is the official guide: <a href="https://docs.docker.com/compose/" rel="nofollow">https://docs.docker.com/compose/</a>

blocks|key|542173|text|默认情况下，Docker容器开始连接到一个名为default的桥接网络。您可以执行docker+network+ls并查看可用的网络。您还可以使用create+networks+with+different+attributes+etc...|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|542174|因此，在您的示例中，两个容器都是在同一个default网络上启动的，这意味着它们应该能够很好地相互通信。事实上，如果您只希望SVN服务器能够与Mongo对话(而不需要从主机连接到mongo+)，那么您甚至不需要公开Mongo容器上的端口。同一网络上的每个容器都可以很好地相互通信，而不会暴露端口。公开端口是为了允许主机>容器连接。|542175|那么，当您尝试从mongo实例卷曲到您的SVN实例时，您使用的主机名/端口是什么？您应该使用svn-server，因为它将解析到SVN容器(使用Docker的内置DNS解析)。|542176|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.docker.com/engine/userguide/networking/dockernetworks/^0|N|7|15|H|21|1C|0|0|K|7|0|1A|A|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]]]

Docker containers by default start attached to a bridge network called <code>default</code>. You can do <code>docker network ls</code> and see the networks you have available. You can also <a href="https://docs.docker.com/engine/userguide/networking/dockernetworks/" rel="nofollow">create networks with different attributes etc...</a> 

So in your case, both your containers are being started on the same <code>default</code> network, which means they should be able to communicate with each other just fine. In fact, if you only want your SVN server to be able to talk to Mongo (and don't need to connect to mongo from your host) you don't even need to expose ports on the Mongo container. Containers on the same network as each can communicate with each other just fine without ports being exposed. Exposing ports is to allow host > container connectivity.

So, what hostname / port are you using when you try to curl from the mongo instance to your SVN instance? You should be using <code>svn-server</code> as that will resolve to the SVN container (using Docker's built-in DNS resolution).

blocks|key|865777|text|通过容器名称实现容器到容器的直连，可以通过user+defined+network实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|865778|docker+network+create+mynet
docker+run+-d+--net=mynet+--name+svn-server+mamohr/subversion-edge
docker+run+-d+--net=mynet+--name+my-mongo+mongo

docker+exec+<svn-id>+ping+my-mongo
docker+exec+<mongo-id>+ping+svn-server|code-block|syntax|javascript|865779|您应该始终能够连接到映射的端口，即使在当前设置中也是如此。主机运行一个监听该端口的进程，因此任何主机IP都应该这样做。|865780|$+docker+run+-d+-p+8080:80+--net=mynet+--name+sleep+busybox+nc+-lp+80+-e+echo+here!
63115ef88664f1186ea012e41138747725790383c741c12ca8675c3058383e68
$+ss+-lntp+%7C+grep+8080
LISTEN+++++0++++++128++++++++++++++++++++++:::8080++++++++++++++++++++:::*++++++users:(("exe",pid=6287,fd=4))
$+docker+run+busybox+nc+<any_host_ip>+8080
here!|865781|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.docker.com/engine/userguide/networking/dockernetworks/#user-defined-networks^0|L|K|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Direct container to container networking via container name can be achieved with a <a href="https://docs.docker.com/engine/userguide/networking/dockernetworks/#user-defined-networks" rel="nofollow">user defined network</a>. 

<pre><code>docker network create mynet
docker run -d --net=mynet --name svn-server mamohr/subversion-edge
docker run -d --net=mynet --name my-mongo mongo

docker exec &lt;svn-id&gt; ping my-mongo
docker exec &lt;mongo-id&gt; ping svn-server
</code></pre>

You should always be able to connect to mapped ports though, even in your current setup. The hosts runs a process that listens on that port so any host IP should do. 

<pre><code>$ docker run -d -p 8080:80 --net=mynet --name sleep busybox nc -lp 80 -e echo here!
63115ef88664f1186ea012e41138747725790383c741c12ca8675c3058383e68
$ ss -lntp | grep 8080
LISTEN 0 128 :::8080 :::* users:(("exe",pid=6287,fd=4))
$ docker run busybox nc &lt;any_host_ip&gt; 8080
here!
</code></pre>

blocks|key|2858390|text|请记住，默认情况下，容器在我们的世界中不可用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2858391|当您运行svn-server容器时，您发布了容器的18080端口，并从主机的18080端口映射它。所以你可以通过http://your_host_IP:18080访问它。|offset|length|2858392|在您的两个docker+run命令中，svn-server容器和my-mongo容器都在默认的网桥网络上。这两个容器通过docker0连接，因此它们可以通过本地主机直接通信。但是，如果您尝试从my-mongo容器中访问http://your_host_IP:18080，这意味着您的请求将首先发送到docker0，但docker0将丢弃您的请求，因为您正在尝试访问主机，而不是svn-server容器。|style|BOLD|2858393|因此，尝试从my-mongo容器中使用这个curl+或curl+来访问svn-server容器。|2858394|entityMap|0|LINK|mutability|MUTABLE|url|http://your_host_ip:18080/|1^0|0|1K|P|0|0|26|4|31|P|1|0|L|4|R|4|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@$D|10|E|11|H|I]]|9|@$D|12|E|13|1|14]]|A|$]]|$1|J|3|K|5|6|7|15|8|@$D|16|E|17|H|I]|$D|18|E|19|H|I]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|S]]]]

Please remember, container is not available by default to the ourside world.

When you running the svn-server container, you published the container's 18080 port and mapped it from the host's 18080 port. So you can access it by <a href="http://your_host_IP:18080" rel="nofollow noreferrer">http://your_host_IP:18080</a>.

From your two docker run commands, both svn-server container and my-mongo container are on the default bridge network. These two containers are connected by docker0, so they can communicate each other directly by localhost. 
But if you tried to access <a href="http://your_host_IP:18080" rel="nofollow noreferrer">http://your_host_IP:18080</a> from within your my-mongo container, that means your request would first be send to docker0, but docker0 will drop your request because you're trying to access the host, not the svn-server container. 

So try this curl <a href="http://localhost:18080" rel="nofollow noreferrer">http://localhost:18080</a> or curl <a href="http://svn-server_IP:18080" rel="nofollow noreferrer">http://svn-server_IP:18080</a> from my-mongo container to access svn-server container.

Hello Helpful Developers,

I'm having issues connecting docker containers. I have built a subversion docker container and a mongo docker container.

docker run -d -p 3343:3343 -p 4434:4434 -p 18080:18080 --name svn-server mamohr/subversion-edge

docker run -p 27017:27017 --name my-mongo -d mongo

I'm able to hit <a href="http://x.x.x.x:18080/" rel="nofollow">http://x.x.x.x:18080/</a> from a browser, but unable to curl from the my-mongo instance. I can talk to each container from my development machine, but unable to talk from container to container.

I see things like --net=bridge, host, ????, but I'm getting confused.

Please help.....

Connecting Docker Containers

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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大家好，有帮助的开发者们，我在连接码头容器时遇到了问题。我已经构建了一个subversion docker容器和一个mongo docker容器。docker run -d -p 3343:3343 subversion 4434:4434 -p 18080:18080 --名称svn服务器mamohr/subversion-edgedocker run -p 27017:27017 --命名为m

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