Developer Guide

Envoy Gateway is built using a make-based build system. Our CI is based on Github Actions using workflows.

Prerequisites

go

  • Version: 1.18.2

  • Installation Guide: https://go.dev/doc/install

make

  • Recommended Version: 4.0 or later

  • Installation Guide: https://www.gnu.org/software/make

docker

  • Optional when you want to build a Docker image or run make inside Docker.

  • Recommended Version: 20.10.16

  • Installation Guide: https://docs.docker.com/engine/install

python3

  • Need a python3 program

  • Must have a functioning venv module; this is part of the standard library, but some distributions (such as Debian and Ubuntu) replace it with a stub and require you to install a python3-venv package separately.

Quickstart

  • Run make help to see all the available targets to build, test and run Envoy Gateway.

Building

  • Run make build to build the Envoy Gateway binary. Note: The binary gets generated in the bin/ directory

Testing

  • Run make test to run the golang tests.

Running Linters

  • Run make lint to make sure your code passes all the linter checks.

Building and Pushing the Image

  • Run IMAGE=docker.io/you/gateway-dev make image to build the docker image.

  • Run IMAGE=docker.io/you/gateway-dev make push-multiarch to build and push the multi-arch docker image.

Note: Replace IMAGE with your registry’s image name.

Deploying Envoy Gateway for Test/Dev

  • Run make create-cluster to create a Kind cluster.

Option 1: Use the Latest gateway-dev Image

  • Run TAG=latest make kube-deploy to deploy Envoy Gateway in the Kind cluster using the latest image. Replace latest to use a different image tag.

Option 2: Use a Custom Image

  • Run make kube-install-image to build an image from the tip of your current branch and load it in the Kind cluster.

  • Run make kube-deploy to install Envoy Gateway into the Kind cluster using your custom image.

Deploying Envoy Gateway in Kubernetes

  • Run TAG=latest make kube-deploy to deploy Envoy Gateway using the latest image into a Kubernetes cluster (linked to the current kube context). Preface the command with IMAGE or replace TAG to use a different Envoy Gateway image or tag.

  • Run make kube-undeploy to uninstall Envoy Gateway from the cluster.

Note: Envoy Gateway is tested against Kubernetes v1.24.0.

Demo Setup

  • Run make kube-demo to deploy a demo backend service, gatewayclass, gateway and httproute resource (similar to steps outlined in the Quickstart docs) and test the configuration.

  • Run make kube-demo-undeploy to delete the resources created by the make kube-demo command.

Run Gateway API Conformance Tests

The commands below deploy Envoy Gateway to a Kubernetes cluster and run the Gateway API conformance tests. Refer to the Gateway API conformance homepage to learn more about the tests. If Envoy Gateway is already installed, run TAG=latest make run-conformance to run the conformance tests.

On a Linux Host

  • Run TAG=latest make conformance to create a Kind cluster, install Envoy Gateway using the latest gateway-dev image, and run Gateway API conformance tests.

On a Mac Host

Since Mac doesn’t support directly exposing the Docker network to the Mac host, use one of the following workarounds to run conformance tests:

  • Deploy your own Kubernetes cluster or use Docker Desktop with Kubernetes support and then run TAG=latest make kube-deploy run-conformance. This will install Envoy Gateway using the latest gateway-dev image to the Kubernetes cluster using the current kubectl context and run the conformance tests. Use make kube-undeploy to uninstall Envoy Gateway.

  • Install and run Docker Mac Net Connect and then run TAG=latest make conformance.

Note: Preface commands with IMAGE or replace TAG to use a different Envoy Gateway image or tag. If TAG is unspecified, the short SHA of your current branch is used.

Debugging the Envoy Config

An easy way to view the envoy config that Envoy Gateway is using is to port-forward to the admin interface port (currently 19000) on the Envoy deployment that corresponds to a Gateway so that it can be accessed locally.

Get the name of the Envoy deployment. The following example is for Gateway eg in the default namespace:

export ENVOY_DEPLOYMENT=$(kubectl get deploy -n envoy-gateway-system --selector=gateway.envoyproxy.io/owning-gateway-namespace=default,gateway.envoyproxy.io/owning-gateway-name=eg -o jsonpath='{.items[0].metadata.name}')

Port forward the admin interface port:

kubectl port-forward deploy/${ENVOY_DEPLOYMENT} -n envoy-gateway-system 19000:19000

Now you are able to view the running Envoy configuration by navigating to 127.0.0.1:19000/config_dump.

There are many other endpoints on the Envoy admin interface that may be helpful when debugging.