sa# Node.js container native design POC Proof of concept of Node.js container native design implementing the following tenets:

• DevOps automation
• Single concern principle
• Service discovery
• High Observability
• Lifecycle conformance
• Runtime confinement
• Process disposability
• Image immutability

The scope of the project is to produce a working node.js based e-commerce application using the above principles. The proposed approach is to create a simple node.js based application based on microservices, incorporating container native design technologies such as high observability, image immutability, and process disposability. This project will make use of existing NPM modules where possible e.g. kube-probe, nodeshift, swagger-ui-express, and third party tools e.g. Istio for microservice management. The output from this project will be a comprehensive example of cloud native node.js application development.

Prerequisites

• Openshift 3.9 installation
• Openshift cli user with admin rights

Proposed architecture

Installation Instructions

Install Istio

• Istio installation

Create project

oc login -u system:admin
oc adm policy add-cluster-role-to-user cluster-admin developer
oc login -u developer
oc new-project samplenode

Install Mongo.db

From OCP portal, create a project "mongodb" and within this project deploy MongoDB (Ephemeral)

Install mongo sample data

!!Will change!!

From Mongo pod terminal

mongo admin --username admin --password admin_pass


use test
db.products.insert({"product_id":2.0,"id":"B000JZ4HQO","title":"Clickart 950 000 - Premier image pack (dvd-rom)","description":"Clickart 950 000 - Premier image pack (dvd-rom)","manufacturer":"Broderbund","price":100.0,"image":"6.jpeg"})
db.reviews.insert({"product_id":2.0,"id":"B000JZ4HQO","title":"Best product I've ever purchased","userId":"Tom Smith"})
db.cart.insert({"product_id":2.0,"id":"B000JZ4HQO","quantity": "1","userId":"Tom Smith"})

Deploying components

From each folder [cart, catalog, gateway, reviews] run

npm run openshift

Once all components are deployed the list of pods should be: (Note each pod shows two containers ready)

Each Pod should contain two containers e.g.

Test

curl http://gateway-samplenode.router.default.svc.cluster.local/products?[1-20]

The response from the curl command should be something like:

http://gateway-samplenode.router.default.svc.cluster.local/products?19 --> <stdout>
--_curl_--http://gateway-samplenode.router.default.svc.cluster.local/products?19
"[{\"_id\":\"5b08448645d5281f811b81f1\",\"product_id\":2,\"id\":\"B000JZ4HQO\",\"title\":\"Clickart 950 000 - Premier image pack (dvd-rom)\",\"description\":\"Clickart 950 000 - Premier image pack (dvd-rom)\",\"manufacturer\":\"Broderbund\",\"price\":100,\"image\":\"6.jpeg\",\"reviews\":\"[{\\\"_id\\\":\\\"5b08448645d5281f811b81f2\\\",\\\"product_id\\\":2,\\\"id\\\":\\\"B000JZ4HQO\\\",\\\"title\\\":\\\"Best product I've ever purchased\\\",\\\"userId\\\":\\\"Tom Smith\\\"}]\"}]"

Service Discovery

Once the services are all operational, navigate to http://gateway-samplenode.router.default.svc.cluster.local/api-docs to view the swagger api ui.

Metrics

Once Jaeger is configured correctly, you should now see trace metrics e.g.

and

And Directed Acyclic Graph e.g.

Introduce http fault

istioctl create -f ./http-fault.yaml
istioctl delete -f ./http-fault.yaml