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SuperEdge

SuperEdge is an open-source container management system for edge computing. It extends native Kubernetes to the edge in a non-intrusive way.

note

This demo is based on containerd + crun.

Install Superedge​

  • Download the installation package
note

Choose an installation package according to your installation node CPU architecture (amd64 or arm64).

arch=amd64 version=v0.6.0 && rm -rf edgeadm-linux-* && wget https://superedge-1253687700.cos.ap-guangzhou.myqcloud.com/$version/$arch/edgeadm-linux-containerd-$arch-$version.tgz && tar -xzvf edgeadm-linux-* && cd edgeadm-linux-$arch-$version && ./edgeadm
  • Install edge Kubernetes master node with containerd runtime
./edgeadm init --kubernetes-version=1.18.2 --image-repository superedge.tencentcloudcr.com/superedge --service-cidr=10.96.0.0/12 --pod-network-cidr=192.168.0.0/16 --install-pkg-path ./kube-linux-*.tar.gz --apiserver-cert-extra-sans=<Master Public IP> --apiserver-advertise-address=<Master Intranet IP> --enable-edge=true --runtime=containerd
  • Join edge node with containerd runtime
./edgeadm join <Master Public/Intranet IP Or Domain>:Port --token xxxx --discovery-token-ca-cert-hash sha256:xxxxxxxxxx --install-pkg-path <edgeadm kube-* install package address path> --enable-edge=true --runtime=containerd

For other installation, deployment, and administration, see our Tutorial

Install WasmEdge​

Use the simple install script to install WasmEdge on your edge node.

curl -sSf https://raw.githubusercontent.com/WasmEdge/WasmEdge/master/utils/install.sh | bash

Build and install Crun with WasmEdge​

The crun project has WasmEdge support baked in. For now, the easiest approach is to build it yourself from source. First, let's ensure crun dependencies are installed on your Ubuntu 20.04. For other Linux distributions, please see here.

sudo apt update
sudo apt install -y make git gcc build-essential pkgconf libtool \
    libsystemd-dev libprotobuf-c-dev libcap-dev libseccomp-dev libyajl-dev \
    go-md2man libtool autoconf python3 automake

Next, configure, build, and install a crun binary with WasmEdge support.

git clone https://github.com/containers/crun
cd crun
./autogen.sh
./configure --with-wasmedge
make
sudo make install

Reconfigure containerd with crun runtime​

Superedge containerd node has default config. We should modify the configuration file(/etc/containerd/config.toml) according to the following steps.

Firstly, we generate config.toml.diff diff file and patch it.

cat > config.toml.diff << EOF
--- /etc/containerd/config.toml 2022-02-14 15:05:40.061562127 +0800
+++ /etc/containerd/config.toml.crun    2022-02-14 15:03:35.846052853 +0800
@@ -24,17 +24,23 @@
   max_concurrent_downloads = 10

   [plugins.cri.containerd]
-        default_runtime_name = "runc"
-    [plugins.cri.containerd.runtimes.runc]
+        default_runtime_name = "crun"
+    [plugins.cri.containerd.runtimes.crun]
       runtime_type = "io.containerd.runc.v2"
-      pod_annotations = []
+      pod_annotations = ["*.wasm.*", "wasm.*", "module.wasm.image/*", "*.module.wasm.image", "module.wasm.image/variant.*"]
       container_annotations = []
       privileged_without_host_devices = false
-      [plugins.cri.containerd.runtimes.runc.options]
-        BinaryName = "runc"
+      [plugins.cri.containerd.runtimes.crun.options]
+        BinaryName = "crun"
   # cni
   [plugins.cri.cni]
     bin_dir = "/opt/cni/bin"
     conf_dir = "/etc/cni/net.d"
     conf_template = ""

+  [plugins."io.containerd.runtime.v1.linux"]
+    no_shim = false
+    runtime = "crun"
+    runtime_root = ""
+    shim = "containerd-shim"
+    shim_debug = false
EOF
sudo patch -d/ -p0 < config.toml.diff
sudo systemctl restart containerd

Create Wasmedge application in Superedge​

We can run a wasm image pushed to dockerhub. If you want to learn how to compile, package, and publish the WebAssembly program as a container image to the Docker hub, please refer to here.

cat > wasmedge-app.yaml << EOF
apiVersion: v1
kind: Pod
metadata:
  annotations:
    module.wasm.image/variant: compat-smart
  labels:
    run: wasi-demo
  name: wasi-demo
spec:
  containers:
  - args:
    - /wasi_example_main.wasm
    - "50000000"
    image: wasmedge/example-wasi:latest
    imagePullPolicy: IfNotPresent
    name: wasi-demo
  hostNetwork: true
  restartPolicy: Never
EOF

kubectl create -f wasmedge-app.yaml

The output will show by executing kubectl logs wasi-demo command.

Random number: -1643170076
Random bytes: [15, 223, 242, 238, 69, 114, 217, 106, 80, 214, 44, 225, 20, 182, 2, 189, 226, 184, 97, 40, 154, 6, 56, 202, 45, 89, 184, 80, 5, 89, 73, 222, 143, 132, 17, 79, 145, 64, 33, 17, 250, 102, 91, 94, 26, 200, 28, 161, 46, 93, 123, 36, 100, 167, 43, 159, 82, 112, 255, 165, 37, 232, 17, 139, 97, 14, 28, 169, 225, 156, 147, 22, 174, 148, 209, 57, 82, 213, 19, 215, 11, 18, 32, 217, 188, 142, 54, 127, 237, 237, 230, 137, 86, 162, 185, 66, 88, 95, 226, 53, 174, 76, 226, 25, 151, 186, 156, 16, 62, 63, 230, 148, 133, 102, 33, 138, 20, 83, 31, 60, 246, 90, 167, 189, 103, 238, 106, 51]
Printed from wasi: This is from a main function
This is from a main function
The env vars are as follows.
The args are as follows.
/wasi_example_main.wasm
50000000
File content is This is in a file