mirror of https://github.com/knative/docs.git
143 lines
4.1 KiB
Markdown
143 lines
4.1 KiB
Markdown
A simple web app written in Deno.
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Follow the steps below to create the sample code and then deploy the app to your
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cluster. You can also download a working copy of the sample, by running the
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following commands:
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```shell
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git clone -b "{{< branch >}}" https://github.com/knative/docs knative-docs
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cd knative-docs/docs/serving/samples/hello-world/helloworld-deno
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```
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## Before you begin
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- A Kubernetes cluster with Knative installed. Follow the
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[installation instructions](../../../../docs/install/README.md) if you need to
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create one.
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- [Docker](https://www.docker.com) installed and running on your local machine,
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and a Docker Hub account configured (we'll use it for a container registry).
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## Recreating the sample code
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1. Create a new file named `deps.ts` and paste the following script:
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```ts
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export { serve } from "https://deno.land/std@std@0.50.0/http/server.ts";
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```
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1. Create a new file named `main.ts` and paste the following script:
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```ts
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import { serve } from "./deps.ts";
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import "https://deno.land/x/dotenv/mod.ts";
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const PORT = Deno.env.get('PORT') || 8080;
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const s = serve(`0.0.0.0:${PORT}`);
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const body = new TextEncoder().encode("Hello Deno\n");
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console.log(`Server started on port ${PORT}`);
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for await (const req of s) {
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req.respond({ body });
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}
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```
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1. Create a new file named `Dockerfile` and copy the code block below into it.
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```docker
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FROM hayd/alpine-deno:1.0.0-rc2
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WORKDIR /app
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# These steps will be re-run upon each file change in your working directory:
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COPY . ./
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# Added to ENTRYPOINT of base image.
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CMD ["run", "--allow-env", "--allow-net", "main.ts"]
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```
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1. Create a new file, `service.yaml` and copy the following service definition
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into the file. Make sure to replace `{username}` with your Docker Hub
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username.
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```yaml
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apiVersion: serving.knative.dev/v1
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kind: Service
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metadata:
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name: helloworld-deno
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namespace: default
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spec:
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template:
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spec:
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containers:
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- image: docker.io/{username}/helloworld-deno
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```
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## Building and deploying the sample
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Once you have recreated the sample code files (or used the files in the sample
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folder) you're ready to build and deploy the sample app.
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1. Use Docker to build the sample code into a container. To build and push with
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Docker Hub, run these commands replacing `{username}` with your Docker Hub
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username:
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```shell
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# Build the container on your local machine
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docker build -t {username}/helloworld-deno .
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# Push the container to docker registry
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docker push {username}/helloworld-deno
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```
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1. After the build has completed and the container is pushed to docker hub, you
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can deploy the app into your cluster. Ensure that the container image value
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in `service.yaml` matches the container you built in the previous step. Apply
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the configuration using `kubectl`:
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```shell
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kubectl apply --filename service.yaml
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```
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1. Now that your service is created, Knative performs the following steps:
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- Create a new immutable revision for this version of the app.
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- Network programming to create a route, ingress, service, and load balance
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for your app.
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- Automatically scale your pods up and down (including to zero active pods).
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1. Run the following command to find the domain URL for your service:
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```shell
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kubectl get ksvc helloworld-deno --output=custom-columns=NAME:.metadata.name,URL:.status.url
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```
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Example:
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```shell
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NAME URL
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helloworld-deno http://helloworld-deno.default.1.2.3.4.xip.io
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```
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1. Now you can make a request to your app and see the result. Replace
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the URL below with the URL returned in the previous command.
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```shell
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curl http://helloworld-deno.default.1.2.3.4.xip.io
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```
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Example:
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```shell
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curl http://helloworld-deno.default.1.2.3.4.xip.io
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[1] "Hello R Sample v1!"
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```
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> Note: Add `-v` option to get more detail if the `curl` command failed.
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## Removing the sample app deployment
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To remove the sample app from your cluster, delete the service record:
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```shell
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kubectl delete --filename service.yaml
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```
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