[GitHub] [openwhisk] chetanmeh opened a new pull request #4671: Standalone OpenWhisk KubernetesContainerFactory support

[GitBox <gi...@apache.org>]

chetanmeh opened a new pull request #4671: Standalone OpenWhisk KubernetesContainerFactory support
URL: https://github.com/apache/openwhisk/pull/4671
 
 
   Enables support for configuring `KubernetesContainerFactory` (KCF) with Standalone OpenWhisk for simplified local development for KCF.
   
   ## Description
   
   To simplify developing on KCF locally this PR adds support for configuring KCF via `--dev-kcf` flag. 
   
   ### Local Port Forwardning
   
   To enable this mode a new config option is added to enable port forwarding
   
   ```
   wsk {
     kubernetes {
       # Enables forwarding to remote port via a local random port. This mode is mostly useful
       # for development via Standalone mode
       port-forwarding-enabled = false
     }
   }
   ```
   
   If this mode is enabled then after launching a pod a local port forward would be enabled and that port would then be used by `ContainerProxy` to communicate with the pod running with k8s
   
   ### Usage
   
   To try out this feature
   
   #### 1. Install and configure Kind
   
   We would use [Kind][1] to setup a local k8s. Follow the steps [here][1] to create a simple cluster
   
   ```bash
   $ kind create cluster --wait 5m
   
   # Export the kind config for kubectl usage
   $ export KUBECONFIG="$(kind get kubeconfig-path)"
   
   # Configure the default namespace
   $ kubectl config set-context --current --namespace=default
   
   # See the config path
   $ kind get kubeconfig-path
   /Users/chetanm/.kube/kind-config-kind
   ```
   
   #### 2. Launch Standalone 
   
   ```bash
   
   # Build the standalone jar
   $ ./gradlew :core:standalone:build
   
   # Launch it with `kubeconfig` system property set to kind config
   $ java  -Dkubeconfig="$(kind get kubeconfig-path)" -jar bin/openwhisk-standalone.jar --dev-kcf
   ```
   
   Once started and required `.wskprops` configured (see standalone startup logs for details) create a `hello.js` function
   
   ```js
   function main(params) {
       greeting = 'hello, world'
       var hello = {payload: greeting}
       var result = {...hello, ...process.env}
       console.log(greeting);
       return result
   }
   ```
   
   ```bash
   $ wsk action create hello hello.js
   $ wsk action invoke hello -br
   ```
   
   This shows an output like below
   
   ```json
   {
       "HOME": "/root",
       "HOSTNAME": "wsk0-2-prewarm-nodejs10",
       "KUBERNETES_PORT": "tcp://10.96.0.1:443",
       "KUBERNETES_PORT_443_TCP": "tcp://10.96.0.1:443",
       "KUBERNETES_PORT_443_TCP_ADDR": "10.96.0.1",
       "KUBERNETES_PORT_443_TCP_PORT": "443",
       "KUBERNETES_PORT_443_TCP_PROTO": "tcp",
       "KUBERNETES_SERVICE_HOST": "10.96.0.1",
       "KUBERNETES_SERVICE_PORT": "443",
       "KUBERNETES_SERVICE_PORT_HTTPS": "443",
       "NODE_VERSION": "10.15.3",
       "PATH": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
       "PWD": "/nodejsAction",
       "YARN_VERSION": "1.13.0",
       "__OW_ACTION_NAME": "/guest/hello",
       "__OW_ACTIVATION_ID": "71e48d2d62e142eca48d2d62e192ec2d",
       "__OW_API_HOST": "http://host.docker.internal:3233",
       "__OW_DEADLINE": "1570223213407",
       "__OW_NAMESPACE": "guest",
       "__OW_TRANSACTION_ID": "iSOoNklk6V7l7eh8KJnvugidKEmaNJmv",
       "payload": "hello, world"
   }
   ```
   

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