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Quickstart

Pre-requisites

Before you begin, you need to have the following installed:

Start and configure a k3d cluster

Start a k3d cluster with the WASM shims already installed:

k3d cluster create wasm-cluster --image ghcr.io/deislabs/containerd-wasm-shims/examples/k3d:v0.3.3 -p "8081:80@loadbalancer" --agents 2 --registry-create mycluster-registry:12345

Apply RuntimeClass for SpiderLightning applications to use the SpiderLightning WASM shim:

kubectl apply -f https://raw.githubusercontent.com/deislabs/containerd-wasm-shims/main/deployments/workloads/runtime.yaml

Deploy an existing sample SpiderLightning application

Deploy a pre-built sample SpiderLightning application:

kubectl apply -f https://raw.githubusercontent.com/deislabs/containerd-wasm-shims/main/deployments/workloads/workload.yaml
echo "waiting 5 seconds for workload to be ready"
sleep 5
curl -v http://0.0.0.0:8081/slight/hello

Confirm you see a response from the sample application. For example:

$ curl -v http://0.0.0.0:8081/slight/hello
*   Trying 0.0.0.0:8081...
* TCP_NODELAY set
* Connected to 0.0.0.0 (127.0.0.1) port 8081 (#0)
> GET /hello HTTP/1.1
> Host: 0.0.0.0:8081
> User-Agent: curl/7.68.0
> Accept: */*
> 
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Accept: */*
< Accept-Encoding: gzip
< Content-Length: 5
< Date: Tue, 11 Oct 2022 19:12:17 GMT
< Host: 0.0.0.0:8081
< User-Agent: curl/7.68.0
< X-Forwarded-For: 10.42.1.1
< X-Forwarded-Host: 0.0.0.0:8081
< X-Forwarded-Port: 8081
< X-Forwarded-Proto: http
< X-Forwarded-Server: traefik-7cd4fcff68-xr2gh
< X-Real-Ip: 10.42.1.1
< Content-Type: text/plain; charset=utf-8
< 
* Connection #0 to host 0.0.0.0 left intact
hello

Delete the pre-built sample SpiderLightning application:

kubectl delete -f https://raw.githubusercontent.com/deislabs/containerd-wasm-shims/main/deployments/workloads/workload.yaml

Build and deploy a SpiderLightning application

Clone the deislabs/containerd-wasm-shims project and navigate to the containerd-wasm-shims/images/slight directory. This directory contains the source for the application you deployed in the previous section.

git clone https://github.com/deislabs/containerd-wasm-shims.git
cd containerd-wasm-shims/images/slight

Use rustup to install the wasm32-wasi target and cargo to build the application. For example:

rustup target add wasm32-wasi
cargo build --target wasm32-wasi

Run the application

Use slight run to run the application on your development computer. For example:

slight -c slightfile.toml run target/wasm32-wasi/debug/http_server_lib.wasm

The application is running at http://0.0.0.0:3000/.

Access the /hello route. For example, use curl in a new terminal window:

$$ curl -v http://0.0.0.0:3000/hello
*   Trying 127.0.0.1:3000...
* Connected to localhost (127.0.0.1) port 3000 (#0)
> GET /hello HTTP/1.1
> Host: localhost:3000
> User-Agent: curl/7.83.1
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< host: localhost:3000
< user-agent: curl/7.83.1
< accept: */*
< access-control-allow-origin: *
< access-control-allow-methods: *
< access-control-allow-headers: *
< access-control-expose-headers: *
< content-length: 12
< date: Fri, 07 Apr 2023 22:58:18 GMT
<
hello world!* Connection #0 to host localhost left intact

Return to the terminal window running slight run and stop the application.

Create a container image for the application

Use docker to build the container image and push it to the k3d registry:

docker buildx build --platform=wasi/wasm -t localhost:12345/qs-wasm-slight .
docker push localhost:12345/qs-wasm-slight:latest

Deploy the application

Create a qs.yaml file with the following:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: wasm-slight
spec:
  replicas: 1
  selector:
    matchLabels:
      app: wasm-slight
  template:
    metadata:
      labels:
        app: wasm-slight
    spec:
      runtimeClassName: wasmtime-slight
      containers:
        - name: testwasm
          image: mycluster-registry:12345/qs-wasm-slight:latest
          command: ["/"]
---
apiVersion: v1
kind: Service
metadata:
  name: wasm-slight
spec:
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
  selector:
    app: wasm-slight
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: wasm-slight
  annotations:
    ingress.kubernetes.io/ssl-redirect: "false"
spec:
  ingressClassName: traefik
  rules:
    - http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: wasm-slight
                port:
                  number: 80

Deploy the application and confirm it is running:

kubectl apply -f qs.yaml
echo "waiting 5 seconds for workload to be ready"
sleep 5
curl -v http://0.0.0.0:8081/hello

Confirm you see a response from the sample application. For example:

$ curl -v http://0.0.0.0:8081/hello
*   Trying 0.0.0.0:8081...
* TCP_NODELAY set
* Connected to 0.0.0.0 (127.0.0.1) port 8081 (#0)
> GET /hello HTTP/1.1
> Host: 0.0.0.0:8081
> User-Agent: curl/7.68.0
> Accept: */*
> 
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Accept: */*
< Accept-Encoding: gzip
< Content-Length: 5
< Date: Tue, 11 Oct 2022 20:29:12 GMT
< Host: 0.0.0.0:8081
< User-Agent: curl/7.68.0
< X-Forwarded-For: 10.42.0.0
< X-Forwarded-Host: 0.0.0.0:8081
< X-Forwarded-Port: 8081
< X-Forwarded-Proto: http
< X-Forwarded-Server: traefik-7cd4fcff68-xr2gh
< X-Real-Ip: 10.42.0.0
< Content-Type: text/plain; charset=utf-8
< 
* Connection #0 to host 0.0.0.0 left intact
hello

Clean up

Remove the sample application:

kubectl delete -f qs.yaml

Delete the cluster:

k3d cluster delete wasm-cluster

Next steps

Try running Wasm applications on Docker Desktop or on Kubernetes, such as AKS.

If you prefer tutorials in video format, check out Deploying Your Wasm WASI App to Kubernetes in 10 minutes on Youtube.