---
title: Use Kapacitor with InfluxDB OSS
description: >
  [Kapacitor](/kapacitor/) is a data processing framework that makes it easy to
  create alerts, run ETL (Extract, Transform and Load) jobs and detect anomalies.
  Use Kapacitor with **InfluxDB OSS 2.0**.
menu:
  influxdb_2_0:
    name: Use Kapacitor
    parent: Tools & integrations
weight: 102
related:
  - /{{< latest "kapacitor" >}}/
---

[Kapacitor](/{{< latest "kapacitor" >}}/) is a data processing framework that makes
it easy to create alerts, run ETL jobs and detect anomalies.
Kapacitor interacts with **InfluxDB Cloud** and **InfluxDB OSS 2.0** using the
[InfluxDB 1.x compatibility API](/influxdb/v2.0/reference/api/influxdb-1x/), so
you can continue using Kapacitor without having to migrate libraries of TICKscripts
to InfluxDB tasks.

{{% note %}}
#### Support for stream tasks
InfluxDB Cloud and InfluxDB OSS 2.0 do not have subscription APIs and
**do not support Kapacitor stream tasks**, but you can continue to use stream
tasks by writing data directly to Kapacitor.
For more information, see [below](#use-kapacitor-stream-tasks).
{{% /note %}}

#### On this page
- [Configure Kapacitor to connect to InfluxDB](#configure-kapacitor-to-connect-to-influxdb)
- [Use Kapacitor batch tasks](#use-kapacitor-batch-tasks)
- [Use Kapacitor stream tasks](#use-kapacitor-stream-tasks)
- [Write back to InfluxDB](#write-back-to-influxdb)

## Configure Kapacitor to connect to InfluxDB
To connect Kapacitor to InfluxDB Cloud or InfluxDB OSS 2.0, update the `[[influxdb]]`
section(s) of your [Kapacitor configuration file](/{{< latest "kapacitor" >}}/administration/configuration/#kapacitor-configuration-file):

- [Specify your InfluxDB URL](#specify-your-influxdb-url)
- [Provide InfluxDB authentication credentials](#provide-influxdb-authentication-credentials)
- [Disable InfluxDB subcriptions](#disable-influxdb-subscriptions)

### Specify your InfluxDB URL
Provide your InfluxDB URL in the `[[influxdb]].urls` configuration option.
For more information, see [InfluxDB Cloud regions](/influxdb/cloud/reference/regions/)
or [InfluxDB OSS URLs](/influxdb/v2.0/reference/urls/).

```toml
[[influxdb]]
  # ...
  urls = ["http://localhost:8086"]
```

### Provide InfluxDB authentication credentials
InfluxDB Cloud and InfluxDB OSS 2.0 require authentication.
Provide the following credentials in your `[[influxdb]].username` and `[[influxdb]].password`
configuration options:

- **username:** InfluxDB username
- **password:** InfluxDB [API token](/influxdb/v2.0/security/tokens/)

```toml
[[influxdb]]
  # ...
  username = "influxdb-username"
  password = "influxdb-token"
```

{{% warn %}}
Kapacitor is subject to InfluxDB token permission restrictions.
To query or write to an InfluxDB bucket, the InfluxDB token must have read and/or
write permissions for the target bucket.
For information about token permissions, see [Create a token](/influxdb/v2.0/security/tokens/create-token/).
{{% /warn %}}

### Disable InfluxDB subscriptions
InfluxDB Cloud and InfluxDB OSS 2.0 do not have subscriptions APIs.
Set the `[[influxdb]].disable-subscriptions`to `true` to disable InfluxDB subscriptions.

```toml
[[influxdb]]
  # ...
  disable-subscriptions = true
```

## Use Kapacitor batch tasks
Kapacitor batch tasks use the `query` endpoint of the 1.x compatibility API
and require no change to use with InfluxDB Cloud and InfluxDB OSS.
For information about writing back to InfluxDB in Kapacitor tasks,
see [Write back to InfluxDB](#write-back-to-influxdb) below.

## Use Kapacitor stream tasks
InfluxDB Cloud and OSS 2.0 do not have subscription APIs and do not support Kapacitor stream tasks directly.
To use Kapacitor stream tasks, write data directly to Kapacitor using the [Kapcitior `write` API](/{{< latest "kapacitor" >}}/working/api/#writing-data).

We recommend using [Telegraf InfluxDB output plugin](/{{< latest "telegraf" >}}/plugins/#output-influxdb)
to write data to both InfluxDB Cloud or OSS and Kapacitor.
The following example Telegraf configuration writes data to both InfluxDB and Kapacitor:

##### Example Telegraf configuration
```toml
# Write to Kapacitor
[[outputs.influxdb]]
  urls = ["http://localhost:9092"]
  database = "example-db"
  retention_policy = "example-rp"

# Write to InfluxDB Cloud or OSS
[[outputs.influxdb]]
  urls = ["http://localhost:8086"]
  database = "example-db"
  retention_policy = "example-rp"
  username = "influxdb-username"
  password = "influxdb-token"
```

## Write back to InfluxDB
If using the Kapacitor `InfluxDBOut` node to write data to InfluxDB Cloud or OSS 2.0,
InfluxDB maps the specified database and retention policy to a corresponding bucket.
You can also manually map database/retention policy combinations (DBRPs) to buckets.
For more information, see [DBRP mapping](/influxdb/v2.0/reference/api/influxdb-1x/dbrp/)
and [Map unmapped buckets](/influxdb/v2.0/query-data/influxql/#map-unmapped-buckets).

The following example TICKscript writes to the `my-db/my-rp` bucket in
InfluxDB Cloud or InfluxDB OSS 2.0.

```js
batch
  |query('SELECT errors / total AS error_percent from requests')
  // Write the transformed data to InfluxDB
  |influxDBOut()
    .database('my-db')
    .retentionPolicy('my-rp')
    .measurement('errors')
    .tag('kapacitor', 'true')
    .tag('version', '0.2')
```