# Knative Secrets - Go A simple web app written in Go that you can use for testing. It demonstrates how to use a Kubernetes secret as a Volume with Knative. We will create a new Google Service Account and place it into a Kubernetes secret, then we will mount it into a container as a Volume. Do the following steps to create the sample code and then deploy the app to your cluster. You can also download a working copy of the sample, by running the following commands: ```bash git clone https://github.com/knative/docs.git knative-docs cd knative-docs/code-samples/serving/secrets-go ``` ## Before you begin - A Kubernetes cluster with Knative installed. See [Install Knative Serving](https://knative.dev/docs/install/serving/install-serving-with-yaml). - [Docker](https://www.docker.com) installed and running on your local machine, and a Docker Hub account configured (we'll use it for a container registry). - Create a [Google Cloud project](https://cloud.google.com/resource-manager/docs/creating-managing-projects) and install the `gcloud` CLI and run `gcloud auth login`. This sample will use a mix of `gcloud` and `kubectl` commands. The rest of the sample assumes that you've set the `$PROJECT_ID` environment variable to your Google Cloud project id, and also set your project ID as default using `gcloud config set project $PROJECT_ID`. ## Recreating the sample code 1. Create a new file named `secrets.go` and paste the following code. This code creates a basic web server which listens on port 8080: ```go package main import ( "context" "fmt" "log" "net/http" "os" "cloud.google.com/go/storage" ) func main() { log.Print("Secrets sample started.") // This sets up the standard GCS storage client, which will pull // credentials from GOOGLE_APPLICATION_CREDENTIALS if specified. ctx := context.Background() client, err := storage.NewClient(ctx) if err != nil { log.Fatalf("Unable to initialize storage client: %v", err) } http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { // This GCS bucket has been configured so that any authenticated // user can access it (Read Only), so any Service Account can // run this sample. bkt := client.Bucket("knative-secrets-sample") // Access the attributes of this GCS bucket, and write it back to the // user. On failure, return a 500 and the error message. attrs, err := bkt.Attrs(ctx) if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } fmt.Fprintln(w, fmt.Sprintf("bucket %s, created at %s, is located in %s with storage class %s\n", attrs.Name, attrs.Created, attrs.Location, attrs.StorageClass)) }) port := os.Getenv("PORT") if port == "" { port = "8080" } log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), nil)) } ``` 1. In your project directory, create a file named `Dockerfile` and copy the following code block into it. For detailed instructions on dockerizing a Go app, see [Deploying Go servers with Docker](https://blog.golang.org/docker). ```docker # Use the official Golang image to create a build artifact. # This is based on Debian and sets the GOPATH to /go. # https://hub.docker.com/_/golang FROM golang as builder ARG TARGETOS ARG TARGETARCH # Copy local code to the container image. WORKDIR /go/src/github.com/knative/docs/hellosecrets COPY . . # Build the output command inside the container. RUN CGO_ENABLED=0 GOOS=linux GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -v -o hellosecrets # Use a Docker multi-stage build to create a lean production image. # https://docs.docker.com/develop/develop-images/multistage-build/#use-multi-stage-builds FROM alpine # Enable the use of outbound https RUN apk add --no-cache ca-certificates # Copy the binary to the production image from the builder stage. COPY --from=builder /go/src/github.com/knative/docs/hellosecrets/hellosecrets /hellosecrets # Service must listen to $PORT environment variable. # This default value facilitates local development. ENV PORT 8080 # Run the web service on container startup. CMD ["/hellosecrets"] ``` 1. [Create a new Google Service Account](https://cloud.google.com/iam/docs/creating-managing-service-accounts). This Service Account doesn't need any privileges, the GCS bucket has been configured so that any authenticated identity may read it. ```bash gcloud iam service-accounts create knative-secrets ``` 1. Create a new JSON key for this account ```bash gcloud iam service-accounts keys create robot.json \ --iam-account=knative-secrets@$PROJECT_ID.iam.gserviceaccount.com ``` 1. Create a new Kubernetes secret from this JSON key: ```bash kubectl create secret generic google-robot-secret --from-file=./robot.json ``` You can achieve a similar result by editting `secret.yaml`, copying the contents of `robot.json` as instructed there, and running `kubectl apply --filename secret.yaml`. 1. Create a new file, `service.yaml` and copy the following service definition into the file. Make sure to replace `{username}` with your Docker Hub username. ```yaml apiVersion: serving.knative.dev/v1 kind: Service metadata: name: secrets-go namespace: default spec: template: spec: containers: # Replace {username} with your DockerHub username - image: docker.io/{username}/secrets-go env: # This directs the Google Cloud SDK to use the identity and project # defined by the Service Account (aka robot) in the JSON file at # this path. # - `/var/secret` is determined by the `volumeMounts[0].mountPath` # below. This can be changed if both places are changed. # - `robot.json` is determined by the "key" that is used to hold the # secret content in the Kubernetes secret. This can be changed # if both places are changed. - name: GOOGLE_APPLICATION_CREDENTIALS value: /var/secret/robot.json # This section specified where in the container we want the # volume containing our secret to be mounted. volumeMounts: - name: robot-secret mountPath: /var/secret # This section attaches the secret "google-robot-secret" to # the Pod holding the user container. volumes: - name: robot-secret secret: secretName: google-robot-secret ``` ## Building and deploying the sample Once you have recreated the sample code files (or used the files in the sample folder) you're ready to build and deploy the sample app. 1. Use Docker to build the sample code into a container. To build and push with Docker Hub, run these commands replacing `{username}` with your Docker Hub username: ```bash # Build and push the container on your local machine. docker buildx build --platform linux/arm64,linux/amd64 -t "{username}/secrets-go" --push . ``` 1. After the build has completed and the container is pushed to docker hub, you can deploy the app into your cluster. Ensure that the container image value in `service.yaml` matches the container you built in the previous step. Apply the configuration using `kubectl`: ```bash kubectl apply --filename service.yaml ``` 1. Now that your service is created, Knative will perform the following steps: - Create a new immutable revision for this version of the app. - Network programming to create a route, ingress, service, and load balance for your app. - Automatically scale your pods up and down (including to zero active pods). 1. Run the following command to find the domain URL for your service: ```bash kubectl get ksvc secrets-go --output=custom-columns=NAME:.metadata.name,URL:.status.url ``` Example: ```bash NAME URL secrets-go http://secrets-go.default.1.2.3.4.sslip.io ``` 1. Now you can make a request to your app and see the result. Replace the following URL with the URL returned in the previous command. ```bash curl http://secrets-go.default.1.2.3.4.sslip.io bucket knative-secrets-sample, created at 2019-02-01 14:44:05.804 +0000 UTC, is located in US with storage class MULTI_REGIONAL ``` > Note: Add `-v` option to get more detail if the `curl` command failed. ## Removing the sample app deployment To remove the sample app from your cluster, delete the service record: ```bash kubectl delete --filename service.yaml kubectl delete secret google-robot-secret ```