Moves graphdriver plugn docs out of experimental
Also updates some of the structures being sent so plugins are getting all the new options. Signed-off-by: Brian Goff <cpuguy83@gmail.com>master
Brian Goff
Tibor Vass
parent
b5b3dd4c6b
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@ -1,12 +1,42 @@
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# Experimental: Docker graph driver plugins
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---
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title: "Graphdriver plugins"
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description: "How to manage image and container filesystems with external plugins"
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keywords: "Examples, Usage, storage, image, docker, data, graph, plugin, api"
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advisory: experimental
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---
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<!-- This file is maintained within the docker/docker Github
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repository at https://github.com/docker/docker/. Make all
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pull requests against that repo. If you see this file in
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another repository, consider it read-only there, as it will
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periodically be overwritten by the definitive file. Pull
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requests which include edits to this file in other repositories
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will be rejected.
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-->
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## Changelog
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### 1.13.0
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- Support v2 plugins
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# Docker graph driver plugins
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Docker graph driver plugins enable admins to use an external/out-of-process
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graph driver for use with Docker engine. This is an alternative to using the
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built-in storage drivers, such as aufs/overlay/devicemapper/btrfs.
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A graph driver plugin is used for image and container filesystem storage, as such
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the plugin must be started and available for connections prior to Docker Engine
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being started.
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You need to install and enable the plugin and then restart the Docker daemon
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before using the plugin. See the following example for the correct ordering
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of steps.
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```
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$ docker plugin install cpuguy83/docker-overlay2-graphdriver-plugin # this command also enables the driver
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<output supressed>
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$ pkill dockerd
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$ dockerd --experimental -s cpuguy83/docker-overlay2-graphdriver-plugin
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```
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# Write a graph driver plugin
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@ -22,20 +52,30 @@ expected to provide the rootfs for containers as well as image layer storage.
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### /GraphDriver.Init
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**Request**:
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```
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```json
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{
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"Home": "/graph/home/path",
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"Opts": []
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"Opts": [],
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"UIDMaps": [],
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"GIDMaps": []
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}
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```
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Initialize the graph driver plugin with a home directory and array of options.
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Plugins are not required to accept these options as the Docker Engine does not
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require that the plugin use this path or options, they are only being passed
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through from the user.
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These are passed through from the user, but the plugin is not required to parse
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or honor them.
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The request also includes a list of UID and GID mappings, structed as follows:
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```json
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{
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"ContainerID": 0,
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"HostID": 0,
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"Size": 0
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}
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```
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**Response**:
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```
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```json
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{
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"Err": ""
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}
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@ -47,20 +87,21 @@ Respond with a non-empty string error if an error occurred.
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### /GraphDriver.Create
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187",
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"Parent": "2cd9c322cb78a55e8212aa3ea8425a4180236d7106938ec921d0935a4b8ca142"
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"MountLabel": ""
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"Parent": "2cd9c322cb78a55e8212aa3ea8425a4180236d7106938ec921d0935a4b8ca142",
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"MountLabel": "",
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"StorageOpt": {}
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}
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```
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Create a new, empty, read-only filesystem layer with the specified
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`ID`, `Parent` and `MountLabel`. `Parent` may be an empty string,
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which would indicate that there is no parent layer.
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`ID`, `Parent` and `MountLabel`. If `Parent` is an empty string, there is no
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parent layer. `StorageOpt` is map of strings which indicate storage options.
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**Response**:
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```
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```json
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{
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"Err": ""
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}
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@ -71,11 +112,12 @@ Respond with a non-empty string error if an error occurred.
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### /GraphDriver.CreateReadWrite
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187",
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"Parent": "2cd9c322cb78a55e8212aa3ea8425a4180236d7106938ec921d0935a4b8ca142"
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"MountLabel": ""
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"Parent": "2cd9c322cb78a55e8212aa3ea8425a4180236d7106938ec921d0935a4b8ca142",
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"MountLabel": "",
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"StorageOpt": {}
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}
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```
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@ -84,7 +126,7 @@ Similar to `/GraphDriver.Create` but creates a read-write filesystem layer.
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### /GraphDriver.Remove
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187"
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}
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@ -93,7 +135,7 @@ Similar to `/GraphDriver.Create` but creates a read-write filesystem layer.
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Remove the filesystem layer with this given `ID`.
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**Response**:
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```
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```json
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{
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"Err": ""
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}
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@ -104,9 +146,9 @@ Respond with a non-empty string error if an error occurred.
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### /GraphDriver.Get
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187"
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187",
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"MountLabel": ""
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}
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```
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@ -114,7 +156,7 @@ Respond with a non-empty string error if an error occurred.
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Get the mountpoint for the layered filesystem referred to by the given `ID`.
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**Response**:
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```
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```json
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{
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"Dir": "/var/mygraph/46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187",
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"Err": ""
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@ -127,7 +169,7 @@ Respond with a non-empty string error if an error occurred.
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### /GraphDriver.Put
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187"
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}
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@ -137,7 +179,7 @@ Release the system resources for the specified `ID`, such as unmounting the
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filesystem layer.
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**Response**:
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```
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```json
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{
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"Err": ""
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}
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@ -148,7 +190,7 @@ Respond with a non-empty string error if an error occurred.
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### /GraphDriver.Exists
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187"
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}
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@ -157,7 +199,7 @@ Respond with a non-empty string error if an error occurred.
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Determine if a filesystem layer with the specified `ID` exists.
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**Response**:
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```
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```json
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{
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"Exists": true
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}
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@ -169,14 +211,14 @@ Respond with a boolean for whether or not the filesystem layer with the specifie
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### /GraphDriver.Status
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**Request**:
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```
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```json
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{}
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```
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Get low-level diagnostic information about the graph driver.
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**Response**:
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```
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```json
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{
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"Status": [[]]
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}
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@ -189,7 +231,7 @@ information.
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### /GraphDriver.GetMetadata
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187"
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}
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@ -199,7 +241,7 @@ Get low-level diagnostic information about the layered filesystem with the
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with the specified `ID`
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**Response**:
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```
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```json
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{
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"Metadata": {},
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"Err": ""
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@ -213,15 +255,15 @@ Respond with a non-empty string error if an error occurred.
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### /GraphDriver.Cleanup
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**Request**:
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```
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```json
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{}
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```
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Perform necessary tasks to release resources help by the plugin, for example
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Perform necessary tasks to release resources help by the plugin, such as
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unmounting all the layered file systems.
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**Response**:
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```
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```json
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{
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"Err": ""
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}
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@ -233,7 +275,7 @@ Respond with a non-empty string error if an error occurred.
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### /GraphDriver.Diff
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187",
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"Parent": "2cd9c322cb78a55e8212aa3ea8425a4180236d7106938ec921d0935a4b8ca142"
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@ -251,7 +293,7 @@ and `Parent`. `Parent` may be an empty string, in which case there is no parent.
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### /GraphDriver.Changes
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187",
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"Parent": "2cd9c322cb78a55e8212aa3ea8425a4180236d7106938ec921d0935a4b8ca142"
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@ -259,10 +301,10 @@ and `Parent`. `Parent` may be an empty string, in which case there is no parent.
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```
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Get a list of changes between the filesystem layers specified by the `ID` and
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`Parent`. `Parent` may be an empty string, in which case there is no parent.
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`Parent`. If `Parent` is an empty string, there is no parent.
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**Response**:
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```
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```json
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{
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"Changes": [{}],
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"Err": ""
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@ -270,7 +312,7 @@ Get a list of changes between the filesystem layers specified by the `ID` and
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```
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Respond with a list of changes. The structure of a change is:
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```
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```json
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"Path": "/some/path",
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"Kind": 0,
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```
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@ -300,7 +342,7 @@ and `Parent`
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- parent (required)- the `Parent` of the given `ID`
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**Response**:
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```
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```json
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{
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"Size": 512366,
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"Err": ""
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@ -313,7 +355,7 @@ Respond with a non-empty string error if an error occurred.
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### /GraphDriver.DiffSize
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**Request**:
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```
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```json
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{
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"ID": "46fe8644f2572fd1e505364f7581e0c9dbc7f14640bd1fb6ce97714fb6fc5187",
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"Parent": "2cd9c322cb78a55e8212aa3ea8425a4180236d7106938ec921d0935a4b8ca142"
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@ -323,7 +365,7 @@ Respond with a non-empty string error if an error occurred.
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Calculate the changes between the specified `ID`
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**Response**:
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```
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```json
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{
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"Size": 512366,
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"Err": ""
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