Set up App and API Protection for Nginx in Kubernetes

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Ingress-nginx support for Datadog

Ingress-nginx is a Kubernetes ingress controller that uses nginx as a reverse proxy and load balancer. In a Kubernetes cluster, external access is restricted by default for security reasons. An ingress controller uses rules to control how external traffic may reach your services.

The ingress-nginx controller is managed through Kubernetes resources, but customization of the underlying nginx configuration is typically limited beyond its intended use case. However, ingress-nginx allows the addition of extra nginx modules for extended functionality. To take advantage of this feature with nginx-datadog, we provide init containers.

How to enable nginx-datadog in ingress-nginx?

To integrate nginx-datadog with ingress-nginx, add a Datadog init container to your pod specification and configure nginx to load the nginx-datadog module.

The following Helm values demonstrate how to inject the nginx-datadog module into an ingress-nginx controller:

controller:
  config: 
    main-snippet: "load_module /modules_mount/ngx_http_datadog_module.so;"
  opentelemetry:
    enabled: false
  extraModules:
    - name: nginx-datadog
      image:
        registry: docker.io
        image: datadog/ingress-nginx-injection
        # The tag should match the version of the ingress-nginx controller
        # For example, this will inject the Datadog module for ingress v1.10.0
        # Check <https://hub.docker.com/repository/docker/datadog/ingress-nginx-injection/tags> 
        # for the list of all versions supported.
        tag: "v1.10.0"
        distroless: false

Check our details examples to help you set up ingress-nginx with nginx-datadog.

How does it work?

Init containers are special containers that run before the main container in a Kubernetes pod. In this case, the Datadog init container is responsible for copying the nginx-datadog module into a shared volume that will be accessible by the main ingress-nginx container.

When the main ingrees-nginx controller starts, the nginx configuration must be updated with the load_module directive, allowing it to load the Datadog module seamlessly.

We provide a specific init container **for each ingress-nginx controller version**, starting with v1.10.0. This is crucial because **each** init container must match the underlying nginx version. To ensure compatibility, ensure the version of the Datadog init container matches your ingress-nginx version.

Interaction with OpenTelemetry

By default, ingress-nginx includes an OpenTelemetry (oTel) module that can be enabled using the enable-opentelemetry: true setting in the ingress-nginx ConfigMap. However, if you are using nginx-datadog for tracing, we recommend disabling OpenTelemetry to prevent duplicate tracing data from both the oTel and Datadog modules.

To disable OpenTelemetry, set enable-opentelemetry: false.