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Merge pull request #29559 from mstanleyjones/define_bridge
Define bridge networks
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@ -32,6 +32,28 @@ An image that has no parent is a **base image**.
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[boot2docker](http://boot2docker.io/) is a lightweight Linux distribution made
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specifically to run Docker containers. The boot2docker management tool for Mac and Windows was deprecated and replaced by [`docker-machine`](#machine) which you can install with the Docker Toolbox.
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## bridge
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In terms of generic networking, a bridge is a Link Layer device which forwards
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traffic between network segments. A bridge can be a hardware device or a
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software device running within a host machine's kernel.
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In terms of Docker, a bridge network uses a software bridge which allows
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containers connected to the same bridge network to communicate, while providing
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isolation from containers which are not connected to that bridge network.
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The Docker bridge driver automatically installs rules in the host machine so
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that containers on different bridge networks cannot communicate directly with
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each other.
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The default bridge network, which is also named `bridge`, behaves differently
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from user-defined bridge networks. Containers connected to the default `bridge`
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network can communicate with each other across the bridge by IP address but
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cannot resolve each other's container name to an IP address unless they are
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explicitly linked using the `--link` flag to `docker run`.
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For more information about Docker networking, see
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[Understand container communication](https://docs.docker.com/engine/userguide/networking/default_network/container-communication/).
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## btrfs
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btrfs (B-tree file system) is a Linux [filesystem](#filesystem) that Docker
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