merge files from the blockchain infra repo (#59)

code/kubernetes/node-server-example/Dockerfile

@@ -0,0 +1,8 @@
+FROM node:4.4
+MAINTAINER "Mia Stein" 
+
+EXPOSE 1337
+
+COPY server.js .
+
+CMD node server.js

code/kubernetes/node-server-example/Makefile

@@ -0,0 +1,15 @@
+.DELETE_ON_ERROR:
+
+build:
+	docker build -t  node_app_test .
+
+run:
+	docker run -d -p 1337:1337 node_app_test
+
+curl:
+	curl localhost:1337
+
+status:
+	docker ps
+
+.PHONY: build run curl status

code/kubernetes/node-server-example/README.md

@@ -0,0 +1,92 @@
+## deploying a node.js K8s cluster with kubectl
+
+<br>
+
+
+* build the image:
+
+```
+make build:
+```
+
+* run the container:
+
+```
+make run
+```
+
+* check whether the server worked:
+
+```
+make curl
+```
+
+* check container's status:
+
+```
+make status
+```
+
+<br>
+
+---
+
+### useful commands
+
+<br>
+
+* exec inside the container:
+
+```
+docker exec -i -t <container name from status> /bin/bash
+```
+
+* check images in disk:
+
+```
+docker images
+```
+
+<br>
+
+----
+
+### pushing the registry to kubernetes
+
+<br>
+
+* in a real production system, we’ll want to build images in one place, then run these images in the Kubernetes cluster
+* the system that images for distribution is called a **container registry**
+* using a `yaml` Kubernetes files (for example, the one inside `node_server_example/`), you can now deploy the image with:
+
+```
+kubectl create -f  node_example_kube_config.yaml
+```
+
+* after that, you are able to create the service with:
+
+```
+kubectl expose deployment node-app-test
+```
+
+* also, check out the service status with:
+
+```
+kubectl get services
+```
+
+<br>
+
+---
+
+### cleanning up
+
+<br>
+
+* removing the service and the deployment when you are done:
+
+```
+kubectl delete service node-app-test
+kubectl delete deployment node-app-test
+```
+

code/kubernetes/node-server-example/node_example_kube_config.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: node_app_test
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        run: node_app_test
+    spec:
+      containers:
+      - name: node_app_test
+        image: node_app_test:1.0
+        ports:
+          - containerPort: 1337
+      imagePullSecrets:
+      - name: <encrypted password for your container registry>

code/kubernetes/node-server-example/server.js

@@ -0,0 +1,11 @@
+var os = require("os");
+var hostname = os.hostname();
+var http = require('http');
+var handleRequest = function(request, response) {
+	  console.log('Received request for URL: ' + request.url);
+	  response.writeHead(200);
+	  response.end("Hello from container " + hostname + "!\n\n");
+};
+var www = http.createServer(handleRequest);
+www.listen(1337);
+