Micro Test

Test microservices on a kubernetes cluster. Create a OpenShift pipeline.

Build Container

Simple rest container, using python3 hug module to implement some limited functionallity.

[x] API Versions
[x] Service Versions
[x] Uptime

Python file docker/service.py
Dockerfile for building the container image, builds on a Python3 image.

Build locally for testing

docker build -t micro-test:3.2 -t micro-test:latest .
docker image ls

Run Container in Docker

Start the container

docker run -p 8000:8000 micro-test

Connect to : http://localhost:8000/v2/version

Deploy Container to minikube from local repository

It is possible to store the container image in the local minikube registry.

minikube ssh
docker images

Build docker image and store it in minicubes registry

eval $(minikube docker-env)
docker build -t micro-test:3.2 -t micro-test:latest .

It is possible to run it like this, but it's better to do a Deployment as described below.

kubectl run --image=micro-test:latest micro-test-app --port=8000 --image-pull-policy=Never

Deploy Container

The file deployment-update.yaml specifies the deployment.

kubectl apply -f deployment-update.yaml
kubectl describe deployment micro-test-app

Expose Container so we can connect to it.

kubectl expose deployment micro-test-app --type=LoadBalancer --port=8000 --target-port=8000

Add routing to the service

kubectl describe service micro-test-app
Name:                     micro-test-app
Namespace:                jenkins
Labels:                   run=micro-test-app
Annotations:              <none>
Selector:                 run=micro-test-app
Type:                     LoadBalancer
IP:                       10.106.54.189
Port:                     <unset>  8000/TCP
TargetPort:               8000/TCP
NodePort:                 <unset>  30770/TCP
Endpoints:                172.17.0.10:8000,172.17.0.11:8000,172.17.0.12:8000 + 7 more...
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

via the minikube ip :

sudo ip route add 10.106.54.0/24 via $(minikube ip)

Then connect to the micro service :

http://10.96.252.238:8000/v2/version

Rolling Upgrade

Update service.py route /version to version 3.4

docker build -t micro-test:3.4 -t micro-test:latest .

Verify that the new image is visable in the minikube container repository

minicube ssh
docker images

Update the deployment-update.yaml with the new version number.

kubectl apply -f deployment-update.yaml

Then connect to the micro service :

http://10.96.252.238:8000/v2/version
http://10.96.252.238:8000/v2/uptime

Referenses

Running Local Docker Images in Kubernetes