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plugin set

Change settings for a plugin

Description

Change settings for a plugin. The plugin must be disabled.

The settings currently supported are:

env variables
source of mounts
path of devices
args

What is settable ?

Look at the plugin manifest, it's easy to see what fields are settable, by looking at the Settable field.

Here is an extract of a plugin manifest:

{
  "config": {
    "args": {
      "name": "myargs",
      "settable": ["value"],
      "value": ["foo", "bar"]
    },
    "env": [
      {
        "name": "DEBUG",
        "settable": ["value"],
        "value": "0"
      },
      {
        "name": "LOGGING",
        "value": "1"
      }
    ],
    "devices": [
      {
        "name": "mydevice",
        "path": "/dev/foo",
        "settable": ["path"]
      }
    ],
    "mounts": [
      {
        "destination": "/baz",
        "name": "mymount",
        "options": ["rbind"],
        "settable": ["source"],
        "source": "/foo",
        "type": "bind"
      }
    ]
  }
}

In this example, we can see that the value of the DEBUG environment variable is settable, the source of the mymount mount is also settable. Same for the path of mydevice and value of myargs.

On the contrary, the LOGGING environment variable doesn't have any settable field, which implies that user cannot tweak it.

Examples

Change an environment variable

The following example change the env variable DEBUG on the sample-volume-plugin plugin.

$ docker plugin inspect -f {{.Settings.Env}} tiborvass/sample-volume-plugin
[DEBUG=0]

$ docker plugin set tiborvass/sample-volume-plugin DEBUG=1

$ docker plugin inspect -f {{.Settings.Env}} tiborvass/sample-volume-plugin
[DEBUG=1]

Change the source of a mount

The following example change the source of the mymount mount on the myplugin plugin.

$ docker plugin inspect -f '{{with $mount := index .Settings.Mounts 0}}{{$mount.Source}}{{end}}' myplugin
/foo

$ docker plugins set myplugin mymount.source=/bar

$ docker plugin inspect -f '{{with $mount := index .Settings.Mounts 0}}{{$mount.Source}}{{end}}' myplugin
/bar

[!NOTE] Since only source is settable in mymount, docker plugins set mymount=/bar myplugin would work too.

Change a device path

The following example change the path of the mydevice device on the myplugin plugin.

$ docker plugin inspect -f '{{with $device := index .Settings.Devices 0}}{{$device.Path}}{{end}}' myplugin

/dev/foo

$ docker plugins set myplugin mydevice.path=/dev/bar

$ docker plugin inspect -f '{{with $device := index .Settings.Devices 0}}{{$device.Path}}{{end}}' myplugin

/dev/bar

[!NOTE] Since only path is settable in mydevice, docker plugins set mydevice=/dev/bar myplugin would work too.

Change the source of the arguments

The following example change the value of the args on the myplugin plugin.

$ docker plugin inspect -f '{{.Settings.Args}}' myplugin

["foo", "bar"]

$ docker plugins set myplugin myargs="foo bar baz"

$ docker plugin inspect -f '{{.Settings.Args}}' myplugin

["foo", "bar", "baz"]

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