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expand stack doc 

Signed-off-by: Michael Friis <friism@gmail.com>
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Michael Friis 2016-06-19 16:14:34 -07:00 committed by Tibor Vass
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experimental/docker-stacks.md
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@ -3,15 +3,12 @@
## Overview ## Overview
Docker Stacks are an experimental feature introduced in Docker 1.12, alongside Docker Stacks are an experimental feature introduced in Docker 1.12, alongside
the new concepts of Swarms and Services inside the Engine. the concept of swarm mode, and Nodes and Services in the Engine API.
A Dockerfile can be built into an image, and containers can be created from that A Dockerfile can be built into an image, and containers can be created from that
image. Similarly, a docker-compose.yml can be built into a **bundle**, and image. Similarly, a docker-compose.yml can be built into a **distributed application bundle**, and **stacks** can be created from that bundle. In that sense, the bundle is a multi-services distributable image format.
**stacks** can be created from that bundle. In that sense, the bundle is a
multi-services distributable image format.
As of 1.12, the feature is introduced as experimental, and Docker Engine doesn't As of Docker 1.12, the feature is experimental. Neither Docker Engine nor the Docker Registry support distribution of bundles.
support distribution of bundles.
## Producing a bundle ## Producing a bundle
@ -96,3 +93,79 @@ Tasks are managed using the `docker stack` command:
Run 'docker stack COMMAND --help' for more information on a command. Run 'docker stack COMMAND --help' for more information on a command.
``` ```
## Bundle file format
Distributed application bundles are described in a JSON format. When bundles are persisted as files, the file extension is `.dab` (Docker 1.12RC2 tools use `.dsb` for the file extension—this will be updated in the next release client).
A bundle has two top-level fields: `version` and `services`. The version used by Docker 1.12 tools is `0.1`.
`services` in the bundle are the services that comprise the app. They correspond to the new `Service` object introduced in the 1.12 Docker Engine API.
A service has the following fields:
<dl>
<dt>
Image (required) <code>string</code>
</dt>
<dd>
The image that the service will run. Docker images should be referenced with full content hash to fully specify the deployment artifact for the service. Example: <code>postgres@sha256:f76245b04ddbcebab5bb6c28e76947f49222c99fec4aadb0bb1c24821a9e83ef</code>
</dd>
<dt>
Command <code>[]string</code>
</dt>
<dd>
Command to run in service containers.
</dd>
<dt>
Args <code>[]string</code>
</dt>
<dd>
Arguments passed to the service containers.
</dd>
<dt>
Env <code>[]string</code>
</dt>
<dd>
Environment variables.
</dd>
<dt>
Labels <code>map[string]string</code>
</dt>
<dd>
Labels used for setting meta data on services.
</dd>
<dt>
Ports <code>[]Port</code>
</dt>
<dd>
Service ports (composed of `Port` (`int`) and `Protocol` (`string`). A service description can only specify the container port to be exposed. These ports can be mapped on runtime hosts at the operator's discretion.
</dd>
<dt>
WorkingDir <code>string</code>
</dt>
<dd>
Working directory inside the service containers.
</dd>
<dt>
User <code>string</code>
</dt>
<dd>
Username or UID (format: <name|uid>[:<group|gid>]).
</dd>
<dt>
Networks <code>[]string</code>
</dt>
<dd>
Networks that the service containers should be connected to. An entity deploying a bundle should create networks as needed.
</dd>
</dl>