Where on Earth Simulator (woe-sim) Microservice

This microservice simulates geographically distributed IoT devices. This service simulates the creation, state, and deletion of IoT devices.

Via the map UI provided by the woe-twin microservice, requests to create and delete IoT devices or requests to change the state of existing devices are processed by this microservice. These processed requests are then sent as simulated device telemetry messages to the woe-twin microservice.

• Where on Earth Simulator (woe-sim) Microservice
  • Deploy the woe-sim microservice
    • Setup a Kubernetes cluster
    • Create the Kubernetes namespace
    • Setup a database for the woe-sim microservice
    • Setup Docker repository
    • Build and push the Docker image
    • Deploy the Docker image to the Kubernetes cluster
    • Check if the pods are running
    • Create a Load Balancer to enable external access
  • Design notes

Deploy the woe-sim microservice

Follow these instructions for installing and running the woe-sim microservice.

First, clone the weo-sim Github project.

git clone https://github.com/mckeeh3/woe-sim.git

Setup a Kubernetes cluster

See Setup Kubernetes for instructions on setting up a Kubernetes cluster in various environments.

Create the Kubernetes namespace

The namespace only needs to be created once.

kubectl create namespace woe-sim

namespace/woe-sim created

Set this namespace as the default for subsequent kubectl commands.

kubectl config set-context --current --namespace=woe-sim

Context "kind-kind" modified.

Setup a database for the woe-sim microservice

See Setup a database for instructions on setting up a Cassandra or PostgreSQL database in various environments.

Setup Docker repository

See Setup a container registry for instructions on setting up a Docker image registry.

Build and push the Docker image

From the woe-sim project directory.

Build the project, which will create a new Docker image.

mvn clean package docker:push

...

[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  36.566 s
[INFO] Finished at: 2021-05-22T14:59:56-04:00
[INFO] ------------------------------------------------------------------------

Deploy the Docker image to the Kubernetes cluster

Select the deployment file for the database environment that you are using.

For Cassandra deployed to the Kubernetes cluster using helm.

kubectl apply -f kubernetes/woe-sim-helm-cassandra.yml

For PostgreSQL deployed to the Kubernetes cluster using helm.

kubectl apply -f kubernetes/woe-sim-helm-postgresql.yml

deployment.apps/woe-sim created
role.rbac.authorization.k8s.io/pod-reader created
rolebinding.rbac.authorization.k8s.io/read-pods created

Check if the pods are running

This may take a few moments.

kubectl get pods

NAME                      READY   STATUS    RESTARTS   AGE
woe-sim-77dfcc864b-6cvrg   1/1     Running   0          3h10m
woe-sim-77dfcc864b-trmz7   1/1     Running   0          3h10m
woe-sim-77dfcc864b-vf78s   1/1     Running   0          3h10m

Create a Load Balancer to enable external access

See Setup a load balancer for instructions on setting up a Kubernetes load balancer in various environments.

Next, deploy the woe-twin microservice.

Design notes

TODO