1. Reference
  2. Device supervisor
  3. Supervisor API
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Interacting with the balena Supervisor

The balena Supervisor is balena's agent that runs on devices. Its main role is to ensure your app is running, and keep communications with the balenaCloud API server.

The Supervisor itself has its own set of APIs providing means for services to communicate and execute some special actions that affect the host OS or the services itself. There are two main ways for the services to interact with the Supervisor:

  • Update lockfile
  • HTTP API

Only Supervisors after version 1.1.0 have this functionality, and some of the endpoints appeared in later versions (we've noted it down where this is the case). Supervisor version 1.1.0 corresponds to OS images downloaded after October 14th, 2015.

HTTP API reference

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

The supervisor exposes an HTTP API on port 48484 (BALENA_SUPERVISOR_PORT).

To enable these Supervisor environment variables, the io.balena.features.supervisor-api label must be applied for each service that requires them. See here for further details.

Note: All endpoints (except /ping) requires an apikey parameter, which is exposed to the services as BALENA_SUPERVISOR_API_KEY.

The full address for the API, i.e. "http://127.0.0.1:48484", is available as BALENA_SUPERVISOR_ADDRESS.

Note: Always use BALENA_* variables when communicating via the API, since address and port could change.

Alternatively, the balena API (api.balena-cloud.com) has a proxy endpoint at POST /supervisor/<url> (where <url> is one of the API URLs described below) from which you can send API commands to the supervisor remotely, using your Auth Token instead of your API key. Commands sent through the proxy can specify either an appId to send the request to all devices in a fleet, or a deviceId or uuid to send to a particular device. These requests default to POST unless you specify a method parameter (e.g. "GET"). In the examples below, we show how to use a uuid to specify a device, but in any of those you can replace uuid for a deviceId or appId.

The API is versioned (currently at v1), except for /ping.

You might notice that the formats of some responses differ. This is because they were implemented later, and in Go instead of node.js - even if the Go pieces were later removed, so we kept the response format for backwards compatibility.

Here's the full list of endpoints implemented so far. In all examples, replace everything between < > for the corresponding values.

GET /ping

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Responds with a simple "OK", signaling that the supervisor is alive and well.

Examples:

From an app container:

$ curl -X GET --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/ping"

Response:

OK

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "method": "GET"}' \
    "https://api.balena-cloud.com/supervisor/ping"

POST /v1/blink

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Starts a blink pattern on a LED for 15 seconds, if your device has one. Responds with an empty 200 response. It implements the "identify device" feature from the dashboard.

Examples:

From an app container:

$ curl -X POST --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/v1/blink?apikey=$BALENA_SUPERVISOR_API_KEY"

(Empty response)

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>"}' \
    "https://api.balena-cloud.com/supervisor/v1/blink"

POST /v1/update

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Triggers a check for the target state of configurations and app services. Optionally, if a new target is available, the force option tells the supervisor to ignore locks and install the update. This will NOT update the supervisor service.

Responds with an empty 204 (No Content) response.

Request body

Can be a JSON object with a force property. If this property is true, the update lock will be overridden.

{
    "force": true
}

Examples:

From an app container:

$ curl -X POST --header "Content-Type:application/json" \
    --data '{"force": true}' \
    "$BALENA_SUPERVISOR_ADDRESS/v1/update?apikey=$BALENA_SUPERVISOR_API_KEY"

(Empty response)

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "data": {"force": true}}' \
    "https://api.balena-cloud.com/supervisor/v1/update"

POST /v1/reboot

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Reboots the device. This will first try to stop running services, and fail if there is an update lock. An optional "force" parameter in the body overrides the lock when true (and the lock can also be overridden from the dashboard).

When successful, responds with 202 accepted and a JSON object:

{
    "Data": "OK",
    "Error": ""
}

Request body

Can contain a force property, which if set to true will cause the update lock to be overridden.

Examples:

From an app container:

$ curl -X POST --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/v1/reboot?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "Data": "OK",
    "Error": ""
}

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>"}' \
    "https://api.balena-cloud.com/supervisor/v1/reboot"

POST /v1/shutdown

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Dangerous: Shuts down the device. This will first try to stop services, and fail if there is an update lock. An optional "force" parameter in the body overrides the lock when true (and the lock can also be overridden from the dashboard).

When successful, responds with 202 accepted and a JSON object:

{
    "Data": "OK",
    "Error": ""
}

Request body

Can contain a force property, which if set to true will cause the update lock to be overridden.

Examples:

From an app container:

$ curl -X POST --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/v1/shutdown?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "Data": "OK",
    "Error": ""
}

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>"}' \
    "https://api.balena-cloud.com/supervisor/v1/shutdown"

POST /v1/purge

Note: This route will remove and recreate all service containers, as volumes can only be removed when their associated containers are removed. On devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Clears the device's /data folder and named volumes if any.

When successful, responds with 200 and a JSON object:

{
    "Data": "OK",
    "Error": ""
}

Request body

Has to be a JSON object with an appId property, corresponding to the ID of the fleet the device is running. Example:

{
    "appId": 2167
}

Examples:

From an app container::

$ curl -X POST --header "Content-Type:application/json" \
    --data '{"appId": <appId>}' \
    "$BALENA_SUPERVISOR_ADDRESS/v1/purge?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "Data": "OK",
    "Error": ""
}

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "data": {"appId": <appId>}}' \
    "https://api.balena-cloud.com/supervisor/v1/purge"

POST /v1/restart

Note: This route will remove and recreate all service containers. See the restart action for more information. On devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Restarts a service.

When successful, responds with 200 and an "OK"

Request body

Has to be a JSON object with an appId property, corresponding to the ID of the fleet the device is running.

Example:

{
    "appId": 2167
}

Examples:

From an app container:

$ curl -X POST --header "Content-Type:application/json" \
    --data '{"appId": <appId>}' \
    "$BALENA_SUPERVISOR_ADDRESS/v1/restart?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

OK

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "data": {"appId": <appId>}}' \
    "https://api.balena-cloud.com/supervisor/v1/restart"

POST /v1/regenerate-api-key

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Invalidates the current BALENA_SUPERVISOR_API_KEY and generates a new one. Responds with the new API key, but the containers will be restarted on the next update cycle to update the API key environment variable.

Examples:

From an app container:

$ curl -X POST --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/v1/regenerate-api-key?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

480af7bb8a9cf56de8a1e295f0d50e6b3bb46676aaddbf4103aa43cb57039364

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>"}' \
    "https://api.balena-cloud.com/supervisor/v1/regenerate-api-key"

GET /v1/device

Introduced in supervisor v1.6.

Note: On devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Returns the current device state, as reported to the balenaCloud API and with some extra fields added to allow control over pending/locked updates. The state is a JSON object that contains some or all of the following:

  • api_port: Port on which the supervisor is listening.
  • commit: Hash of the current commit of the release that is running on the fleet.
  • ip_address: Space-separated list of IP addresses of the device.
  • mac_address: Space-separated list of MAC addresses of the device.
  • status: Status of the device regarding the app, as a string, i.e. "Stopping", "Starting", "Downloading", "Installing", "Idle".
  • download_progress: Amount of the release that has been downloaded, expressed as a percentage. If the update has already been downloaded, this will be null.
  • os_version: Version of the host OS running on the device.
  • supervisor_version: Version of the supervisor running on the device.
  • update_pending: This one is not reported to the balenaCloud API. It's a boolean that will be true while the Supervisor is checking for updates (such as on boot or every poll interval) or if the supervisor has finally concluded there is an update.
  • update_downloaded: Not reported to the balenaCloud API either. Boolean that will be true if a pending update has already been downloaded.
  • update_failed: Not reported to the balenaCloud API. Boolean that will be true if the supervisor has tried to apply a pending update but failed (i.e. if the app was locked, there was a network failure or anything else went wrong).

Other attributes may be added in the future, and some may be missing or null if they haven't been set yet.

Examples:

From an app container:

$ curl -X GET --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/v1/device?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "api_port":48484,
    "ip_address":"192.168.0.114 10.42.0.3",
    "commit":"414e65cd378a69a96f403b75f14b40b55856f860",
    "status":"Downloading",
    "download_progress":84,
    "os_version":"Resin OS 1.0.4 (fido)",
    "supervisor_version":"1.6.0",
    "update_pending":true,
    "update_downloaded":false,
    "update_failed":false
}

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "method": "GET"}' \
    "https://api.balena-cloud.com/supervisor/v1/device"

POST /v1/apps/:appId/stop

Introduced in supervisor v1.8

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Temporarily stops a service. A reboot or supervisor restart will cause the container to start again. The container is not removed with this endpoint.

This is only supported on single-container devices, and will return 400 on devices running multiple containers. Refer to v2 endpoint, /v2/applications/:appId/stop-service for running the query on multiple containers.

When successful, responds with 200 and the Id of the stopped container.

The appId must be specified in the URL.

Request body

Can contain a force property, which if set to true will cause the update lock to be overridden.

Examples:

From an app container:

$ curl -X POST --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/v1/apps/<appId>/stop?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "containerId":"5f4d4a857742e9ecac505ba5710834d3852ad7d71e10389fc6f61d8655a21806"
}

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>"}' \
    "https://api.balena-cloud.com/supervisor/v1/apps/<appId>/stop"

POST /v1/apps/:appId/start

Introduced in supervisor v1.8

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Starts a service, usually after it has been stopped with /v1/stop.

This is only supported on single-container devices, and will return 400 on devices running multiple containers. Refer to v2 endpoint, /v2/applications/:appId/start-service for running the query on multiple containers.

When successful, responds with 200 and the Id of the started container.

The appId must be specified in the URL.

Examples:

From an app container:

$ curl -X POST --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/v1/apps/<appId>/start?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "containerId":"6d9e1efdb9aad90fdb2df911f785b6aa00270e9448e75226a9a7361c8a9500cf"
}

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>"}' \
    "https://api.balena-cloud.com/supervisor/v1/apps/<appId>/start"

GET /v1/apps/:appId

Introduced in supervisor v1.8

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Returns the services running on the device The app is a JSON object that contains the following:

  • appId: The id of the fleet as per the balenaCloud API.
  • commit: Release commit that is running.
  • imageId: The docker image of the current build.
  • containerId: ID of the docker container of the running app.
  • env: A key-value store of the app's environment variables.

The appId must be specified in the URL.

This is only supported on single-container devices, and will return 400 on devices running multiple containers. Refer to v2 endpoint, /v2/applications/:appId/state for running the query on multiple containers.

Examples:

From an app container:

$ curl -X GET --header "Content-Type:application/json" \
    "$BALENA_SUPERVISOR_ADDRESS/v1/apps/<appId>?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "appId": 3134,
    "commit":"414e65cd378a69a96f403b75f14b40b55856f860",
    "imageId":"registry.balena-cloud.com/superapp/414e65cd378a69a96f403b75f14b40b55856f860",
    "containerId":"e5c1eace8b4e",
    "env":{
        "FOO":"bar"
    }
}

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "method": "GET"}' \
    "https://api.balena-cloud.com/supervisor/v1/apps/<appId>"

GET /v1/healthy

Introduced in supervisor v6.5

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Used internally to check whether the supervisor is running correctly, according to some heuristics that help determine whether the internal components, release updates and reporting to the balenaCloud API are functioning.

Responds with an empty 200 response if the supervisor is healthy, or a 500 status code if something is not working correctly.

Examples:

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v1/healthy"

(Empty response)

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "method": "GET"}' \
    "https://api.balena-cloud.com/supervisor/v1/healthy"

PATCH /v1/device/host-config

Introduced in supervisor v6.6

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

This endpoint allows setting some configuration values for the host OS. Currently it supports proxy and hostname configuration.

For proxy configuration, balenaOS 2.0.7 and higher provides a transparent proxy redirector (redsocks) that makes all connections be routed to a SOCKS or HTTP proxy. This endpoint allows services to modify these proxy settings at runtime.

Request body

A JSON object with several optional fields. Proxy and hostname configuration go under a network key. If proxy or hostname are not present (undefined), those values will not be modified, so that a request can modify hostname without changing proxy settings and vice versa.

By default, with balenaOS 2.82.6 or newer, host config PATCH requests will cause a balenaEngine restart. Therefore, with Supervisor v12.11.34 and newer, the PATCH request will respect the presence of update locks. Specify the force boolean (false by default) property in the request body to ignore this.

{
    "network": {
        "proxy": {
            "type": "http-connect",
            "ip": "myproxy.example.com",
            "port": 8123,
            "login": "username",
            "password": "password",
            "noProxy": [ "152.10.30.4", "253.1.1.0/16" ],
            "dns": "1.1.1.1:53"
        },
        "hostname": "mynewhostname",
        "force": true
    }
}

In the proxy settings, type, ip, port, login and password are the settings for the proxy redirector to be able to connnect to the proxy, based on how redsocks.conf works. type can be socks4, socks5, http-connect or http-relay (not all proxies are guaranteed to work, especially if they block connections that the balena services may require).

Keep in mind that, even if transparent proxy redirection will take effect immediately after the API call (i.e. all new connections will go through the proxy), open connections will not be closed. So, if for example, the device has managed to connect to the balenaCloud VPN without the proxy, it will stay connected directly without trying to reconnect through the proxy, unless the connection breaks - any reconnection attempts will then go through the proxy. To force all connections to go through the proxy, the best way is to reboot the device (see the /v1/reboot endpoint). In most networks were no connections to the Internet can be made if not through a proxy, this should not be necessary (as there will be no open connections before configuring the proxy settings).

The noProxy setting for the proxy is an optional array of IP addresses/subnets that should not be routed through the proxy. Keep in mind that local/reserved subnets are already excluded by balenaOS automatically.

As of v16.6.0, the Supervisor supports configuring the dnsu2t plugin for redsocks via the dns subfield under proxy. Only the remote_ip and remote_port fields are allowed to be modified. The input must be of type boolean or string. If boolean and true, the remote values will be the default, 8.8.8.8:53. If boolean and false, the configuration will be removed. If string, it should be in the format ADDRESS:PORT, with ADDRESS and PORT both required. You may not configure dnsu2t without a redsocks proxy configuration, as dnsu2t depends on a working proxy to function.

If any of proxy, dns, or hostname are nullish, falsey, or empty values (i.e. {} for proxy, false for dns, or an empty string for hostname), they will be cleared to their default settings (i.e. not using a proxy, not using dns, and a hostname equal to the first 7 characters of the device's uuid, respectively).

Examples:

From an app container:

$ curl -X PATCH --header "Content-Type:application/json" \
    --data '{"network": {"hostname": "newhostname"}}' \
    "$BALENA_SUPERVISOR_ADDRESS/v1/device/host-config?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

OK

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "method": "PATCH", "data": {"network": {"hostname": "newhostname"}}}' \
    "https://api.balena-cloud.com/supervisor/v1/device/host-config"

GET /v1/device/host-config

Introduced in supervisor v6.6

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

This endpoint allows reading some configuration values for the host OS, previously set with PATCH /v1/device/host-config. Currently it supports proxy and hostname configuration.

Please refer to the PATCH endpoint above for details on the behavior and meaning of the fields in the response.

Examples:

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v1/device/host-config?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "network":{
        "proxy":{
            "ip":"192.168.0.199",
            "port":"8123",
            "type":"socks5"
        },
        "hostname":"27b0fdc",
        "dns": "1.1.1.1:53"
    }
}

Remotely via the API proxy:

$ curl -X POST --header "Content-Type:application/json" \
    --header "Authorization: Bearer <auth token>" \
    --data '{"uuid": "<uuid>", "method": "GET"}' \
    "https://api.balena-cloud.com/supervisor/v1/device/host-config"

GET /v2/applications/state

Introduced in supervisor v7.12

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Get a list of fleets, services and their statuses. This will reflect the current state of the supervisor, and not the target state.

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v2/applications/state?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
  "appname": {
    "appId": 1011165,
    "commit": "217d55237092995e4576367e529ebb03",
    "services": {
      "main": {
        "status": "Downloaded",
        "releaseId": 557617,
        "downloadProgress": null
      },
      "frontend": {
        "status": "Downloading",
        "releaseId": 557631,
        "downloadProgress": 0
      },
      "proxy": {
        "status": "Downloaded",
        "releaseId": 557631,
        "downloadProgress": null
      },
      "data": {
        "status": "Downloading",
        "releaseId": 557631,
        "downloadProgress": 7
      },
      "metrics": {
        "status": "Downloading",
        "releaseId": 557631,
        "downloadProgress": 35
      }
    }
  }
}

Remotely via the API proxy:

curl -X POST \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <auth token>' \
  -d '{"uuid": "<uuid>", "method": "GET"}' \
  "https://api.balena-cloud.com/supervisor/v2/applications/state"

GET /v2/applications/:appId/state

Introduced in supervisor v7.12

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Use this endpoint to get the state of a single fleet, given the appId.

From an app container:

curl "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/state?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
  "local": {
    "1234": {
      "services": {
        "5678": {
          "status": "Running",
          "releaseId": 99999,
          "download_progress": null
        }
      }
    }
  },
  "commit": "7fc9c5bea8e361acd49886fe6cc1e1cd"
}

GET /v2/state/status

Introduced in supervisor v9.7

This will return a list of images, containers, the overall download progress and the status of the state engine.

Note: The status field in the JSON response does not indicate the status of the device itself, but rather the status of the HTTP response. To get an accurate representation of whether the device state has settled, use the appState field. appState will be one of applying or applied.

From an app container:

curl "$BALENA_SUPERVISOR_ADDRESS/v2/state/status?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
  "status": "success",
  "appState": "applied",
  "overallDownloadProgress": null,
  "containers": [
    {
      "status": "Running",
      "serviceName": "main",
      "appId": 1032480,
      "imageId": 959262,
      "serviceId": 29396,
      "containerId": "be4a860e34ffca609866f8af3596e9ee7b869e1e0bb9f51406d0b120b0a81cdd",
      "createdAt": "2019-03-11T16:05:34.506Z"
    }
  ],
  "images": [
    {
      "name": "registry2.balena-cloud.com/v2/fbf67cf6574fb0f8da3c8998226fde9e@sha256:9e328a53813e3c2337393c63cfd6c2f5294872cf0d03dc9f74d02e66b9ca1221",
      "appId": 1032480,
      "serviceName": "main",
      "imageId": 959262,
      "dockerImageId": "sha256:2662fc0ca0c7dd0f549e87e224f454165f260ff54aac59308d2641d99ca95e58",
      "status": "Downloaded",
      "downloadProgress": null
    }
  ],
  "release": "804281fb17e8291c542f9640814ef546"
}

Service Actions

The Fleet ID

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

For the following endpoints the fleet ID is required in the url. The fleet ID is exposed as BALENA_APP_ID inside your container. Otherwise, you can use the following snippet to determine the fleet ID programmatically:

APPNAME="supervisortest"
BALENA_APP_ID=$(curl --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/state?apikey=$BALENA_SUPERVISOR_API_KEY" | jq ".$APPNAME.appId")

The easiest way to find your fleet from the dashboard is to look at the url when on the device list.

POST /v2/applications/:appId/restart-service

Note: This route will remove and recreate the specified service container. See the restart action for more information. On devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Added in supervisor version v7.0.0. Support for passing serviceName instead of imageId added in v8.2.2.

Use this endpoint to restart a service in the fleet with fleet id passed in with the url.

From an app container:

curl --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/restart-service?apikey=$BALENA_SUPERVISOR_API_KEY" -d '{"serviceName": "my-service"}'
curl --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/restart-service?apikey=$BALENA_SUPERVISOR_API_KEY" -d '{"imageId": 1234}'

Response:

OK

This endpoint can also take an extra optional boolean, force, which if true informs the supervisor to ignore any update locks which have been taken.

POST /v2/applications/:appId/stop-service

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Added in supervisor version v7.0.0. Support for passing serviceName instead of imageId added in v8.2.2.

Temporarily stops a service. Rebooting the device or supervisor will cause the container to start again. The container is not removed with this endpoint.

From an app container:

curl --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/stop-service?apikey=$BALENA_SUPERVISOR_API_KEY" -d '{"serviceName": "my-service"}'
curl --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/stop-service?apikey=$BALENA_SUPERVISOR_API_KEY" -d '{"imageId": 1234}'

Response:

OK

This endpoint can also take an extra optional boolean, force, which if true informs the supervisor to ignore any update locks which have been taken.

POST /v2/applications/:appId/start-service

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Added in supervisor version v7.0.0. Support for passing serviceName instead of imageId added in v8.2.2.

Use this endpoint to start a service in the device.

From an app container:

curl --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/start-service?apikey=$BALENA_SUPERVISOR_API_KEY" -d '{"serviceName": "my-service"}'
curl --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/start-service?apikey=$BALENA_SUPERVISOR_API_KEY" -d '{"imageId": 1234}'

Response:

OK

This endpoint can also take an extra optional boolean, force, which if true informs the supervisor to ignore any update locks which have been taken.

POST /v2/applications/:appId/restart

Note: This route will remove and recreate all service containers. See the restart action for more information. On devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Added in supervisor version v7.0.0.

Use this endpoint to restart every service in a fleet.

From an app container:

curl -X POST --header "Content-Type: application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/restart?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

OK

This endpoint can also take an extra optional boolean, force, which if true informs the supervisor to ignore any update locks which have been taken.

POST /v2/applications/:appId/purge

Note: on devices with supervisor version lower than 7.22.0, replace all BALENA_ variables with RESIN_, e.g. RESIN_SUPERVISOR_ADDRESS instead of BALENA_SUPERVISOR_ADDRESS.

Added in supervisor version v7.0.0.

Use this endpoint to purge all user data for a given fleet id.

From an app container:

curl -X POST --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/applications/$BALENA_APP_ID/purge?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

OK

This endpoint can also take an extra optional boolean, force, which if true informs the supervisor to ignore any update locks which have been taken.

GET /v2/version

Introduced in supervisor v7.21

This endpoint returns the supervisor version currently running the device api.

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v2/version?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "status": "success",
    "version": "v7.21.0"
}

GET /v2/containerId

Introduced in supervisor v8.6

Use this endpoint to match a service name to a container ID.

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v2/containerId?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "status": "success",
    "services": {
        "service-one": "ad6d5d32576ad3cb1fcaa59b564b8f6f22b079631080ab1a3bbac9199953eb7d",
        "service-two": "756535dc6e9ab9b560f84c85063f55952273a23192641fc2756aa9721d9d1000"
    }
}

You can also specify a service, to return only that container id:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v2/containerId?apikey=$BALENA_SUPERVISOR_API_KEY&service=service-one"

Response:

{
    "status": "success",
    "containerId": "ad6d5d32576ad3cb1fcaa59b564b8f6f22b079631080ab1a3bbac9199953eb7d"
}

Local mode endpoints

These endpoints are mainly for use by the CLI, for working with a local mode device. As such they are not recommended for general use.

The device must be in local mode before these endpoints are called, with the exception of GET /v2/local/target-state, which can be called when the device is not in local mode.

GET /v2/local/target-state

Introduced in supervisor v7.21

Get the current target state. Note that if a local mode target state has not been set then the apps section of the response will always be empty.

Request:

curl "$BALENA_SUPERVISOR_ADDRESS/v2/local/target-state"

Response:

{
    "status": "success",
    "state": {
        "local": {
            "name": "my-device",
            "config": {
                "HOST_CONFIG_disable_splash": "1",
                "HOST_CONFIG_dtparam": "\"i2c_arm=on\",\"spi=on\",\"audio=on\"",
                "HOST_CONFIG_enable_uart": "1",
                "HOST_CONFIG_gpu_mem": "16",
                "SUPERVISOR_LOCAL_MODE": "1",
                "SUPERVISOR_PERSISTENT_LOGGING": "",
                "SUPERVISOR_POLL_INTERVAL": "600000",
                "SUPERVISOR_VPN_CONTROL": "true",
                "SUPERVISOR_CONNECTIVITY_CHECK": "true",
                "SUPERVISOR_LOG_CONTROL": "true",
                "SUPERVISOR_DELTA": "false",
                "SUPERVISOR_DELTA_REQUEST_TIMEOUT": "30000",
                "SUPERVISOR_DELTA_APPLY_TIMEOUT": "",
                "SUPERVISOR_DELTA_RETRY_COUNT": "30",
                "SUPERVISOR_DELTA_RETRY_INTERVAL": "10000",
                "SUPERVISOR_DELTA_VERSION": "2",
                "SUPERVISOR_OVERRIDE_LOCK": "false"
            },
            "apps": {}
        }
    }
}

POST /v2/local/target-state

Introduced in supervisor v7.21

Set the current target state.

Request:

TARGET_STATE='{
    "local": {
        "name": "Home",
        "config": {
            "HOST_CONFIG_disable_splash": "1",
            "HOST_CONFIG_dtparam": "i2c_arm=on,i2s=on",
            "HOST_CONFIG_enable_uart": "1",
            "HOST_CONFIG_gpio": "\"2=op\",\"3=op\"",
            "HOST_CONFIG_gpu_mem": "16",
            "SUPERVISOR_LOCAL_MODE": "1",
            "SUPERVISOR_POLL_INTERVAL": "600000",
            "SUPERVISOR_VPN_CONTROL": "true",
            "SUPERVISOR_CONNECTIVITY_CHECK": "true",
            "SUPERVISOR_LOG_CONTROL": "true",
            "SUPERVISOR_DELTA": "false",
            "SUPERVISOR_DELTA_REQUEST_TIMEOUT": "30000",
            "SUPERVISOR_DELTA_APPLY_TIMEOUT": "",
            "SUPERVISOR_DELTA_RETRY_COUNT": "30",
            "SUPERVISOR_DELTA_RETRY_INTERVAL": "10000",
            "SUPERVISOR_DELTA_VERSION": "2",
            "SUPERVISOR_OVERRIDE_LOCK": "false",
            "SUPERVISOR_PERSISTENT_LOGGING": "false"
        },
        "apps": {
            "1": {
                "name": "localapp",
                "commit": "localcommit",
                "releaseId": "1",
                "services": {
                    "1": {
                        "environment": {},
                        "labels": {},
                        "imageId": 1,
                        "serviceName": "one",
                        "serviceId": 1,
                        "image": "local_image_one:latest",
                        "running": true
                    },
                    "2": {
                        "environment": {},
                        "labels": {},
                        "network_mode": "container:one",
                        "imageId": 2,
                        "serviceName": "two",
                        "serviceId": 2,
                        "image": "local_image_two:latest",
                        "running": true
                    }
                },
                "volumes": {},
                "networks": {}
            }
        }
    }
}
'

curl -X POST --header "Content-Type:application/json" "$BALENA_SUPERVISOR_ADDRESS/v2/local/target-state" -d $TARGET_STATE

Response:

{
    "status": "success",
    "message": "OK"
}

Get the device type information

Introduced in supervisor v7.21

Get the architecture and device type of the device.

Request:

curl "$BALENA_SUPERVISOR_ADDRESS/v2/local/device-info"

Response:

{
    "status": "success",
    "info": {
        "arch": "armv7hf",
        "deviceType": "raspberry-pi3"
    }
}

Stream local mode logs from device

Introduced in supervisor v7.21

This endpoint will stream the logs of the services and the supervisor. The logs come in as NDJSON.

Request:

curl "$BALENA_SUPERVISOR_ADDRESS/v2/local/logs"

Response:

{
    "message": "log line text",
    "timestamp": 1541508467072,
    "serviceName": "main"
}
{
    "message": "another log line",
    "timestamp": 1541508467072,
    "serviceName": "main"
}

V2 Device Information

Device name

Introduced in supervisor v9.11

Get the last returned device name from the balena API. Note that this differs from the BALENA_DEVICE_NAME_AT_INIT environment variable provided to containers, as this will not change throughout the runtime of the container, but the endpoint will always return the latest known device name.

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v2/device/name?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "status": "success",
    "deviceName": "holy-wildflower"
}

Device tags

Introduced in supervisor v9.11

Retrieve any device tags from the balena API. Note that this endpoint will not work when the device does not have an available connection to the balena API.

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v2/device/tags?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "status": "success",
    "tags": [
        {
            "id": 188303,
            "name": "DeviceLocation",
            "value": "warehouse #3"
        }
    ]
}

Device VPN Information

Introduced in supervisor v11.4

Retrieve information about the VPN connection running on the device.

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v2/device/vpn?apikey=$BALENA_SUPERVISOR_API_KEY"

Response:

{
    "status": "success",
    "vpn": {
        "enabled": true,
        "connected": true
    }
}

V2 Utilities

Cleanup volumes with no references

Introduced in supervisor v10.0

Starting with balena-supervisor v10.0.0, volumes which have no references are no longer automatically removed as part of the standard update flow. To cleanup up any orphaned volumes, use this supervisor endpoint:

From an app container:

$ curl "$BALENA_SUPERVISOR_ADDRESS/v2/cleanup-volumes?apikey=$BALENA_SUPERVISOR_API_KEY"

Successful response:

{
       "status": "success"
}

Unsuccessful response:

{
       "status": "failed",
       "message": "the error message"
}

Journald logs

Introduced in supervisor v10.2

Retrieve a stream to the journald logs on device. This is equivalent to running journalctl --no-pager. Options supported are:

all: boolean

Show all fields in full, equivalent to journalctl --all.

follow: boolean

Continuously stream logs as they are generated, equivalent to journalctl --follow.

count: integer

Show the most recent count events, equivalent to journalctl --line=<count>.

unit

Show journal logs from unit only, equivalent to journalctl --unit=<unit>.

containerId

Show journal logs for the given containerId identifier only, equivalent to journalctl -t=<containerId>.

format

Introduced in supervisor v10.3

The format which will be streamed from journalctl, formats are described here: https://www.freedesktop.org/software/systemd/man/journalctl.html#-o

Fields should be provided via POST body in JSON format.

From an app container:

$ curl -X POST -H "Content-Type: application/json" --data '{"follow":true,"all":true}' "$BALENA_SUPERVISOR_ADDRESS/v2/journal-logs?apikey=$BALENA_SUPERVISOR_API_KEY" > log.journal
since: string

Introduced in supervisor v14.7.0 Show journal logs since the given since timestamp, formats are described here: https://www.freedesktop.org/software/systemd/man/journalctl.html#-S

until: string

Introduced in supervisor v14.7.0 Show journal logs until the given until timestamp, formats are described here: https://www.freedesktop.org/software/systemd/man/journalctl.html#-S

An example project using this endpoint can be found in this repository.