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+page_title: Plugin API documentation
+page_description: Documentation for writing a Docker plugin.
+page_keywords: docker, plugins, api, extensions
+
+# Docker Plugin API
+
+Docker plugins are out-of-process extensions which add capabilities to the
+Docker Engine.
+
+This page is intended for people who want to develop their own Docker plugin.
+If you just want to learn about or use Docker plugins, look
+[here](/userguide/plugins).
+
+## What plugins are
+
+A plugin is a process running on the same docker host as the docker daemon,
+which registers itself by placing a file in `/usr/share/docker/plugins` (the
+"plugin directory").
+
+Plugins have human-readable names, which are short, lowercase strings. For
+example, `flocker` or `weave`.
+
+Plugins can run inside or outside containers. Currently running them outside
+containers is recommended.
+
+## Plugin discovery
+
+Docker discovers plugins by looking for them in the plugin directory whenever a
+user or container tries to use one by name.
+
+There are two types of files which can be put in the plugin directory.
+
+* `.sock` files are UNIX domain sockets.
+* `.spec` files are text files containing a URL, such as `unix:///other.sock`.
+
+The name of the file (excluding the extension) determines the plugin name.
+
+For example, the `flocker` plugin might create a UNIX socket at
+`/usr/share/docker/plugins/flocker.sock`.
+
+Plugins must be run locally on the same machine as the Docker daemon.  UNIX
+domain sockets are strongly encouraged for security reasons.
+
+## Plugin lifecycle
+
+Plugins should be started before Docker, and stopped after Docker.  For
+example, when packaging a plugin for a platform which supports `systemd`, you
+might use [`systemd` dependencies](
+http://www.freedesktop.org/software/systemd/man/systemd.unit.html#Before=) to
+manage startup and shutdown order.
+
+When upgrading a plugin, you should first stop the Docker daemon, upgrade the
+plugin, then start Docker again.
+
+If a plugin is packaged as a container, this may cause issues. Plugins as
+containers are currently considered experimental due to these shutdown/startup
+ordering issues. These issues are mitigated by plugin retries (see below).
+
+## Plugin activation
+
+When a plugin is first referred to -- either by a user referring to it by name
+(e.g.  `docker run --volume-driver=foo`) or a container already configured to
+use a plugin being started -- Docker looks for the named plugin in the plugin
+directory and activates it with a handshake. See Handshake API below.
+
+Plugins are *not* activated automatically at Docker daemon startup. Rather,
+they are activated only lazily, or on-demand, when they are needed.
+
+## API design
+
+The Plugin API is RPC-style JSON over HTTP, much like webhooks.
+
+Requests flow *from* the Docker daemon *to* the plugin.  So the plugin needs to
+implement an HTTP server and bind this to the UNIX socket mentioned in the
+"plugin discovery" section.
+
+All requests are HTTP `POST` requests.
+
+The API is versioned via an Accept header, which currently is always set to
+`application/vnd.docker.plugins.v1+json`.
+
+## Handshake API
+
+Plugins are activated via the following "handshake" API call.
+
+### /Plugin.Activate
+
+**Request:** empty body
+
+**Response:**
+```
+{
+    "Implements": ["VolumeDriver"]
+}
+```
+
+Responds with a list of Docker subsystems which this plugin implements.
+After activation, the plugin will then be sent events from this subsystem.
+
+## Volume API
+
+If a plugin registers itself as a `VolumeDriver` (see above) then it is
+expected to provide writeable paths on the host filesystem for the Docker
+daemon to provide to containers to consume.
+
+The Docker daemon handles bind-mounting the provided paths into user
+containers.
+
+### /VolumeDriver.Create
+
+**Request**:
+```
+{
+    "Name": "volume_name"
+}
+```
+
+Instruct the plugin that the user wants to create a volume, given a user
+specified volume name.  The plugin does not need to actually manifest the
+volume on the filesystem yet (until Mount is called).
+
+**Response**:
+```
+{
+    "Err": null
+}
+```
+
+Respond with a string error if an error occurred.
+
+### /VolumeDriver.Remove
+
+**Request**:
+```
+{
+    "Name": "volume_name"
+}
+```
+
+Create a volume, given a user specified volume name.
+
+**Response**:
+```
+{
+    "Err": null
+}
+```
+
+Respond with a string error if an error occurred.
+
+### /VolumeDriver.Mount
+
+**Request**:
+```
+{
+    "Name": "volume_name"
+}
+```
+
+Docker requires the plugin to provide a volume, given a user specified volume
+name. This is called once per container start.
+
+**Response**:
+```
+{
+    "Mountpoint": "/path/to/directory/on/host",
+    "Err": null
+}
+```
+
+Respond with the path on the host filesystem where the volume has been made
+available, and/or a string error if an error occurred.
+
+### /VolumeDriver.Path
+
+**Request**:
+```
+{
+    "Name": "volume_name"
+}
+```
+
+Docker needs reminding of the path to the volume on the host.
+
+**Response**:
+```
+{
+    "Mountpoint": "/path/to/directory/on/host",
+    "Err": null
+}
+```
+
+Respond with the path on the host filesystem where the volume has been made
+available, and/or a string error if an error occurred.
+
+### /VolumeDriver.Unmount
+
+**Request**:
+```
+{
+    "Name": "volume_name"
+}
+```
+
+Indication that Docker no longer is using the named volume. This is called once
+per container stop.  Plugin may deduce that it is safe to deprovision it at
+this point.
+
+**Response**:
+```
+{
+    "Err": null
+}
+```
+
+Respond with a string error if an error occurred.
+
+## Plugin retries
+
+Attempts to call a method on a plugin are retried with an exponential backoff
+for up to 30 seconds. This may help when packaging plugins as containers, since
+it gives plugin containers a chance to start up before failing any user
+containers which depend on them.
diff --git a/docs/sources/experimental/plugins.md b/docs/sources/experimental/plugins.md
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+page_title: Experimental feature - Plugins
+page_keywords: experimental, Docker, plugins
+
+# Overview
+
+You can extend the capabilities of the Docker Engine by loading third-party
+plugins.
+
+## Types of plugins
+
+Plugins extend Docker's functionality.  They come in specific types.  For
+example, a [volume plugin](/experimental/plugins_volume) might enable Docker
+volumes to persist across multiple Docker hosts.
+
+Currently Docker supports volume plugins. In the future it will support
+additional plugin types.
+
+## Installing a plugin
+
+Follow the instructions in the plugin's documentation.
+
+## Finding a plugin
+
+The following plugins exist:
+
+* The [Flocker plugin](https://clusterhq.com/docker-plugin/) is a volume plugin
+which provides multi-host portable volumes for Docker, enabling you to run
+  databases and other stateful containers and move them around across a cluster
+  of machines.
+
+## Troubleshooting a plugin
+
+If you are having problems with Docker after loading a plugin, ask the authors
+of the plugin for help. The Docker team may not be able to assist you.
+
+## Writing a plugin
+
+If you are interested in writing a plugin for Docker, or seeing how they work
+under the hood, see the [docker plugins reference](/experimental/plugin_api).
+
+# Related GitHub PRs and issues
+
+- [#13222](https://github.com/docker/docker/pull/13222) Plugins plumbing
+
+Send us feedback and comments on [#13419](https://github.com/docker/docker/issues/13419),
+or on the usual Google Groups (docker-user, docker-dev) and IRC channels.
diff --git a/docs/sources/experimental/plugins_volume.md b/docs/sources/experimental/plugins_volume.md
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+page_title: Experimental feature - Volume plugins
+page_keywords: experimental, Docker, plugins, volume
+
+# Overview
+
+Docker volume plugins enable Docker deployments to be integrated with external
+storage systems, such as Amazon EBS, and enable data volumes to persist beyond
+the lifetime of a single Docker host. See the [plugin documentation](/experimental/plugins)
+for more information.
+
+# Command-line changes
+
+This experimental features introduces two changes to the `docker run` command:
+
+- The `--volume-driver` flag is introduced.
+- The `-v` syntax is changed to accept a volume name a first component.
+
+Example:
+
+    $ docker run -ti -v volumename:/data --volume-driver=flocker busybox sh
+
+By specifying a volume name in conjunction with a volume driver, volume plugins
+such as [Flocker](https://clusterhq.com/docker-plugin/), once installed, can be
+used to manage volumes external to a single host, such as those on EBS. In this
+example, "volumename" is passed through to the volume plugin as a user-given
+name for the volume which allows the plugin to associate it with an external
+volume beyond the lifetime of a single container or container host. This can be
+used, for example, to move a stateful container from one server to another.
+
+The `volumename` must not begin with a `/`.
+
+# API changes
+
+The container creation endpoint (`/containers/create`) accepts a `VolumeDriver`
+field of type `string` allowing to specify the name of the driver. It's default
+value of `"local"` (the default driver for local volumes).
+
+# Related GitHub PRs and issues
+
+- [#13161](https://github.com/docker/docker/pull/13161) Volume refactor and external volume plugins
+
+Send us feedback and comments on [#13420](https://github.com/docker/docker/issues/13420),
+or on the usual Google Groups (docker-user, docker-dev) and IRC channels.