Question

How to make docker only use a private network to communicate with other hosts?

Posted August 29, 2015 12.9k views
Docker Networking

Hello! How can I configure Docker to exclusively use this private network? How to make the network interface that the docker creates docker0 only use the private network?

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1 answer

At its simplest, you can bind a container to a specific network at runtime. For example, the nginx container exposes port 80. To bind that to port 8080 on your Droplet’s private network, run:

  • docker run -p priv.net.ip.addr:8080:80 nginx

Docker also provides many more complex networking options. For a high level overview, see:

For a deeper dive, take a look at “Understand Docker container networks” from the Docker docs.

Using some of the concepts covered there, you could also create a new bridge network that is available over your private IP address. For example,

  • docker network create -o "com.docker.network.bridge.host_binding_ipv4"="priv.net.ip.addr" privnet

Now to specify that a container should use this new bridge network instead of using docker0, run it with:

  • docker run --net=privnet -p 8080:80 nginx
by Justin Ellingwood
When constructing distributed systems to serve Docker containers, communication and networking become extremely important. In this guide, we will discuss the various networking strategies and tools used to mold the networks used by containers into their desired state.
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