containerd

    In the sections below, we will explain the steps in the quick start scripts.

    Use the following commands to install containerd on your system.

    Configure containerd to use as the underlying OCI runtime. It makes changes to the /etc/containerd/config.toml file.

    1. sudo bash -c "containerd config default > /etc/containerd/config.toml"
    2. wget https://raw.githubusercontent.com/second-state/wasmedge-containers-examples/main/containerd/containerd_config.diff
    3. sudo patch -d/ -p0 < containerd_config.diff
    1. sudo systemctl start containerd

    Next, make sure that you have built and installed the crun binary with WasmEdge support before running the following examples.

    Now, we can run a simple WebAssembly program using containerd. explains how to compile, package, and publish the WebAssembly program as a container image to Docker hub. In this section, we will start off pulling this WebAssembly-based container image from Docker hub using containerd tools.

    Now, you can run the example in just one line with ctr (the containerd cli).

    1. sudo ctr run --rm --runc-binary crun --runtime io.containerd.runc.v2 --label module.wasm.image/variant=compat docker.io/hydai/wasm-wasi-example:with-wasm-annotation wasm-example /wasi_example_main.wasm 50000000
    2. Random number: -1678124602
    3. Random bytes: [12, 222, 246, 184, 139, 182, 97, 3, 74, 155, 107, 243, 20, 164, 175, 250, 60, 9, 98, 25, 244, 92, 224, 233, 221, 196, 112, 97, 151, 155, 19, 204, 54, 136, 171, 93, 204, 129, 177, 163, 187, 52, 33, 32, 63, 104, 128, 20, 204, 60, 40, 183, 236, 220, 130, 41, 74, 181, 103, 178, 43, 231, 92, 211, 219, 47, 223, 137, 70, 70, 132, 96, 208, 126, 142, 0, 133, 166, 112, 63, 126, 164, 122, 49, 94, 80, 26, 110, 124, 114, 108, 90, 62, 250, 195, 19, 189, 203, 175, 189, 236, 112, 203, 230, 104, 130, 150, 39, 113, 240, 17, 252, 115, 42, 12, 185, 62, 145, 161, 3, 37, 161, 195, 138, 232, 39, 235, 222]
    4. Printed from wasi: This is from a main function
    5. The env vars are as follows.
    6. The args are as follows.
    7. /wasi_example_main.wasm
    9. File content is This is in a file

    Next, you can try to run it in Kubernetes!

    Finally, we can run a simple WebAssembly-based HTTP micro-service in containerd. explains how to compile, package, and publish the WebAssembly program as a container image to Docker hub. In this section, we will start off pulling this WebAssembly-based container image from Docker hub using containerd tools.

    Now, you can run the example in just one line with ctr (the containerd cli). Notice that we are running the container with --net-host so that the HTTP server inside the WasmEdge container is accessible from the outside shell.

    1. sudo ctr run --rm --net-host --runc-binary crun --runtime io.containerd.runc.v2 --label module.wasm.image/variant=compat docker.io/avengermojo/http_server:with-wasm-annotation http-server-example /http_server.wasm
    1. new connection at 1234
    3. # Test the HTTP service at that IP address

    Next, you can try to run it in Kubernetes!