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Deploy a private GoDoc server on Google Kubernetes Engine

Author(s): @richarddli ,   Published: 2020-07-20


Go has emerged as an incredibly popular language in the cloud-native ecosystem. Go is a popular choice for both microservices and cloud-native infrastructure such as Kubernetes. Go includes a documentation generator, GoDoc, that generates HTML documentation from Go source code. GoDoc powers pkg.go.dev, which hosts public documentation of Go source libraries, including GoDoc itself.

According to the 2019 Go Developer Survey, 85% of Go developers don’t actually run their own internal documentation server. We hope that this statistic doesn't actually indicate a lack of documentation!

This tutorial shows you how to deploy a private GoDoc service on Google Kubernetes Engine, using Ambassador Edge Stack.

Set up your local environment

To set up your computer, you install the gcloud and kubectl command-line tools.

  1. Follow the instructions to download and install the Cloud SDK, which includes the gcloud command-line tool.
  2. Ensure that kubectl is installed and updated:

    sudo gcloud components update kubectl
    

Set up a Kubernetes cluster in Google Kubernetes Engine

Setting up a production-ready Kubernetes cluster can be fairly complex, so this tutorial uses Google Kubernetes Engine. If you already have a Kubernetes cluster available, you can skip this section.

  1. Create a cluster using one of the following options:

    • Use the Create cluster button in the Cloud Console.
    • Use a gcloud command like the following, which creates a small cluster in the us-central1-c region:

      gcloud beta container --project "xxx" clusters create "cluster-1" --zone "us-central1-c" --no-enable-basic-auth --cluster-version "1.14.10-gke.36" --machine-type "n1-standard-1" --image-type "COS" --disk-type "pd-standard" --disk-size "100" --metadata disable-legacy-endpoints=true --scopes "https://www.googleapis.com/auth/devstorage.read_only","https://www.googleapis.com/auth/logging.write","https://www.googleapis.com/auth/monitoring","https://www.googleapis.com/auth/servicecontrol","https://www.googleapis.com/auth/service.management.readonly","https://www.googleapis.com/auth/trace.append" --num-nodes "3" --enable-stackdriver-kubernetes --enable-ip-alias --network "projects/datawireio/global/networks/default" --subnetwork "projects/datawireio/regions/us-central1/subnetworks/default" --default-max-pods-per-node "110" --no-enable-master-authorized-networks --addons HorizontalPodAutoscaling,HttpLoadBalancing --enable-autoupgrade --enable-autorepair --max-surge-upgrade 1 --max-unavailable-upgrade 0
      
  2. Authenticate to your cluster:

    gcloud container clusters get-credentials CLUSTER_NAME
    gcloud auth application-default login
    

Deploy the GoDoc service

In this section, you deploy the Ambassador Edge Stack as your ingress controller. Ambassador Edge Stack is an ingress controller and API Gateway built on Envoy Proxy. It includes a free OpenID Connect integration that can be integrated with Google for single sign-on. In this architecture, requests first arrive at Ambassador, which passes only authenticated requests on to your GoDoc service.

The GoDoc service consists of 150 lines of Go that integrates the godoc binary with Kubernetes and GitHub. The source code for the service is available in the godoc-service repository on GitHub.

Set up Ambassador Edge Stack

You can install Ambassador Edge Stack with a Helm chart, YAML, or the command-line installer. This tutorial uses the command-line installer, which automatically provisions a TLS certificate and a domain for you.

  1. Download the edgectl client and install Ambassador Edge Stack the following command:

    edgectl install
    
  2. Follow the on-screen instructions to continue the installation.

When the installation is complete, you should see the following:

Ambassador Edge Stack Installation Complete!
========================================================================

Congratulations! You've successfully installed the Ambassador Edge Stack in
your Kubernetes cluster. You can find it at your custom URL:
https://objective-nash-360.edgestack.me/

The installation process automatically provisions a certificate from Let’s Encrypt, and the management UI should appear in your browser. If it doesn’t, you can use the command edgectl login $URL.

Set up the GoDoc service

In this section, you configure the GoDoc service with a Kubernetes secret.

  1. Get a GitHub personal access token with full control of your private repositories.

  2. Create a Kubernetes secret that stores the GitHub token, along with the GitHub repositories that you want to document. The example below shows publishing documentation on Ambassador and the godoc-service:

    kubectl create secret generic godoc-service-config --from-literal=githubToken=YOUR_GITHUB_TOKEN --from-literal=githubRepos="ambassadorlabs/godoc-service;datawire/ambassador"
    

Deploy the GoDoc service

If you’re familiar with Kubernetes, you probably know that deploying source code into Kubernetes requires a bunch of steps: building the container, pushing to a Docker registry, deploying the container with the right Kubernetes manifest onto Kubernetes, and then registering a route with your ingress to the Kubernetes service.

Ambassador Edge Stack uses a special resource, the Project resource, that does this workflow automatically by using Kaniko to do an in-cluster Docker build and push to a private OCI-compliant registry based on Docker registry. This micro-CD pipeline can thus deploy code from GitHub straight into Kubernetes so that you can get to Version 0 quickly.

In this section, you use this feature to deploy the GoDoc service.

  1. Enable the micro-CD pipeline:

    kubectl apply -f https://www.getambassador.io/yaml/projects.yaml
    
  2. Create a Project CRD and configuration. Use the same GitHub personal access token that you previously created, and make sure that the host matches your actual edgestack.me domain.

    ---
    apiVersion: getambassador.io/v2
    kind: Project
    metadata:
    name: documentation
    namespace: default
    spec:
    host:  YOUR_DOMAIN_HERE.edgestack.me
    prefix: /doc/
    githubRepo: ambassadorlabs/godoc-service
    githubToken: YOUR_GITHUB_TOKEN
    

Ambassador clones the GitHub repository, builds the container for the service, and deploys the container into a Kubernetes pod. This process will take a few minutes; you can follow the build process in the Projects tab of the Ambassador user interface.

When the build is complete, visit https://YOUR_DOMAIN.edgestack.me/doc/ in your browser to see your Go documentation.

Next steps

Ambassador Edge Stack integrates with many different identity providers over OpenID Connect for single sign-on, including Google's IDP. Deploy an authentication Filter and FilterPolicy to ensure that only people in your organization have access to your documentation server.

Unless you want to keep using the edgestack.me domain, you’ll also want to create a new Host that maps to a hostname in your DNS. Edge Stack automatically provisions a certificate from Let’s Encrypt as soon as you set up the new Host. For more details, see the Host CRD documentation.

Happy coding in Go!

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