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Running http_server example in CRI-O with WasmEdge support

Quick start

Please following the CRI-O crio/README.md in the example to setup CRI-O and crun.

Run a simple WebAssembly app

With Wasm support crun can with directly with the http_server with-wasm-annotation. In this section, we will start off pulling the http_server WebAssembly-based container image from Docker hub using CRI-O tools.

sudo crictl pull docker.io/wasmedge/example-wasi-http:latest

Next, we need to create two simple configuration files that specifies how CRI-O should run this WebAssembly image in a sandbox. We already have those two files container_http_server.json and sandbox_config.json. You can just download them to your local directory as follows.

wget https://raw.githubusercontent.com/second-state/wasmedge-containers-examples/main/crio/sandbox_config.json
wget https://raw.githubusercontent.com/second-state/wasmedge-containers-examples/main/crio/http_server/container_http_server.json

Now you can use CRI-O to create a pod and a container using the specified configurations.

# Create the POD. Output will be different from example.
POD_ID=`sudo crictl runp sandbox_config.json`

# Echo the POD_ID to make sure it is completed
echo $POD_ID

# Create the container instance. Output will be different from example.
CONTAINER_ID=`sudo crictl create $POD_ID container_http_server.json sandbox_config.json`

# Echo the CONTAINER_ID to make sure it is completed
echo $CONTAINER_ID

Starting the container would execute the WebAssembly program. List the container, the state should be Created

sudo crictl ps -a

Then you can start the http_server

# Start the container
sudo crictl start $CONTAINER_ID

# Check the container status again.
# You should see the http_server is in the Running state.
sudo crictl ps

Check the http_server ip with inspect and request the service with curl post

HTTP_IP=`sudo crictl inspect $CONTAINER_ID | grep IP.0 | cut -d: -f 2 | cut -d'"' -f 2`
curl -d "param1=value1&param2=value2" -X POST http://$HTTP_IP:1234

echo param1=value1&param2=value2

If you can see the server echo back the value you input, then that's it!