Rate limit a Consumer with Kong Gateway

Uses: Kong Gateway decK

Deployment Platform:

Prerequisites

Kong Konnect

This is a Konnect tutorial and requires a Konnect personal access token.

Create a new personal access token by opening the Konnect PAT page and selecting Generate Token.
Export your token to an environment variable:
```
 export KONNECT_TOKEN='YOUR_KONNECT_PAT'
```
Run the quickstart script to automatically provision a Control Plane and Data Plane, and configure your environment:
```
 curl -Ls https://get.konghq.com/quickstart | bash -s -- -k $KONNECT_TOKEN --deck-output
```
This sets up a Konnect Control Plane named quickstart, provisions a local Data Plane, and prints out the following environment variable exports:
```
 export DECK_KONNECT_TOKEN=$KONNECT_TOKEN
 export DECK_KONNECT_CONTROL_PLANE_NAME=quickstart
 export KONNECT_CONTROL_PLANE_URL=https://us.api.konghq.com
 export KONNECT_PROXY_URL='http://localhost:8000'
```
Copy and paste these into your terminal to configure your session.

Kong Gateway running

This tutorial requires Kong Gateway Enterprise. If you don’t have Kong Gateway set up yet, you can use the quickstart script with an enterprise license to get an instance of Kong Gateway running almost instantly.

Export your license to an environment variable:

 export KONG_LICENSE_DATA='LICENSE-CONTENTS-GO-HERE'

Run the quickstart script:

 curl -Ls https://get.konghq.com/quickstart | bash -s -- -e KONG_LICENSE_DATA 

Once Kong Gateway is ready, you will see the following message:

 Kong Gateway Ready

decK

decK is a CLI tool for managing Kong Gateway declaratively with state files. To complete this tutorial you will first need to install decK.

Required entities

For this tutorial, you’ll need Kong Gateway entities, like Gateway Services and Routes, pre-configured. These entities are essential for Kong Gateway to function but installing them isn’t the focus of this guide. Follow these steps to pre-configure them:

Run the following command:

echo '
_format_version: "3.0"
services:
  - name: example-service
    url: http://httpbin.konghq.com/anything
routes:
  - name: example-route
    paths:
    - "/anything"
    service:
      name: example-service
' | deck gateway apply -

To learn more about entities, you can read our entities documentation.

Create a Consumer

Consumers let you identify the client that’s interacting with Kong Gateway. We’re going to use key authentication in this tutorial, so the Consumer needs an API key to access any Kong Gateway Services.

echo '
_format_version: "3.0"
consumers:
  - username: jsmith
    keyauth_credentials:
    - key: example-key
' | deck gateway apply -

Enable authentication

Authentication lets you identify a Consumer so that you can apply rate limiting. This example uses the Key Authentication plugin, but you can use any authentication plugin that you prefer.

Enable the plugin globally, which means it applies to all Kong Gateway Services and Routes:

echo '
_format_version: "3.0"
plugins:
  - name: key-auth
    config:
      key_names:
      - apikey
' | deck gateway apply -

Enable rate limiting

Enable the Rate Limiting plugin for the Consumer. In this example, the limit is 5 requests per minute and 1000 requests per hour.

echo '
_format_version: "3.0"
plugins:
  - name: rate-limiting
    consumer: jsmith
    config:
      minute: 5
      hour: 1000
' | deck gateway apply -

Validate

You can run the following command to test the rate limiting as the Consumer:

for _ in {1..6}; do
  curl  -i $KONNECT_PROXY_URL/anything \
       -H "apikey:example-key" 
  echo
done

for _ in {1..6}; do
  curl  -i http://localhost:8000/anything \
       -H "apikey:example-key" 
  echo
done

On the last request, you should get a 429 response with the message API rate limit exceeded.

Cleanup

Clean up Konnect environment

If you created a new control plane and want to conserve your free trial credits or avoid unnecessary charges, delete the new control plane used in this tutorial.

Destroy the Kong Gateway container

curl -Ls https://get.konghq.com/quickstart | bash -s -- -d