merge files from the blockchain infra repo (#59)

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
+```
+