rate-limit-operator

Rate Limit operator for Envoy Proxy

Quick Start

Steps to got Operator working

• Deploy the Operator ( kubectl or helm )
• Deploy RateLimit CR

Deployment

Requirements

In this example we assume you already have a k8s cluster running

Deploy using kubectl

$ make deploy

You can find public image in the softonic/rate-limit-operator docker hub repository.

Deploy using Helm

$ make helm-deploy

Create a CR ratelimit

$ kubectl apply -f config/samples/networking_v1alpha1_ratelimit.yaml

DEVEL ENVIRONMENT

Compile the code and deploy the needed resources

$ make generate
$ make run

Motivation

The operator will help you configure the necessary resources to get to this

https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/rate_limit_filter#config-http-filters-rate-limit

from a CR that you will need to provide.

This operator will need this CR, and from this configuration will create the necessary envoyfilters resources in istio control plane, and the necessary configs ratelimit system

https://github.com/envoyproxy/ratelimit

needs.

This is accomplished with a new CRD.

In this new CRD, you can set different configuration depending on your needs.

Here is an example you can start with

apiVersion: networking.softonic.io/v1alpha1
kind: RateLimit
metadata:
  finalizers:
  - ratelimit.networking.softonic.io
  name: test
spec:
  destinationCluster: outbound|80||server.nameSpaceTarget.svc.cluster.local
  rate:
  - dimensions:
    - request_header:
        descriptor_key: remote_address
        header_name: x-custom-user-ip
    requestPerUnit: 100
    unit: second
  targetRef:
    apiVersion: networking.istio.io/v1alpha3
    kind: VirtualService
    name: nameVS
    namespace: nameSpaceTarget

• targetRef will point to a VS that will have the host field that you will need in your envoyfilter in order to apply the routing
• destinationCluster ( optional ) is the Cluster ( here cluster is referring to the concept of cluster in the envoy/istio language ) If you dont set this field, operator will try to find the destination cluster for your application looking at the Virtual Service http route destination
• following configuration refer to what to limit. In this case we are limiting 100 per second per x-custom-ip

Diagram