themoosman / ocp-python-crash-me

Sample Python application with OpenShift / Kubernetes Liveness and Readiness probes

OpenShift Python Crash Me

This repository provides a sample Python web application implemented using the Flask web framework. It is intended to be used to demonstrate deployment of Python web applications to OpenShift 3 or 4.

Original code from: https://github.com/OpenShiftDemos/os-sample-python

Modifications

This sample has been modified to be a sample Python application with Kubernetes Liveness and Readiness probes.

Deployment Steps

To deploy this sample Python web application from the OpenShift use the provided template.

Template parameters can be found here. https://github.com/themoosman/ocp-python-crash-me/blob/master/.ocp/deployment.yaml#L155-L176

The OCP Template Way

#Create the DEV project
oc new-project python-crash-me-dev

#To deploy the build components
oc process -f build.yaml -p NAMESPACE=python-crash-me-dev | oc create -f -

#Create the DEV deployment resources
oc process -f deployment.yaml -p NAMESPACE=python-crash-me-dev -p IMAGE_NAMESPACE=py-crash-me-dev -p ENVIRONMENT=dev | oc create -f -

#Start the build
oc start-build python-crash-me

#Rollout out the deployment
oc rollout latest dc/python-crash-me

#To simulate a rollout to QA
oc new-project python-crash-me-qa

#Create the QA deployment resources
oc process -f deployment.yaml -p NAMESPACE=python-crash-me-qa -p IMAGE_NAMESPACE=py-crash-me-dev -p ENVIRONMENT=qa | oc create -f -

#Tag the images from DEV to QA
oc tag python-crash-me-dev/py-crash-me:latest py-crash-me-qa/py-crash-me:latest

#Rollout to QA
oc rollout latest dc/python-crash-me

The Helm Way

#Create the DEV project
oc new-project python-crash-me-dev

#To deploy the build and deployment components
helm upgrade --install python-crash-me .helm/python-crash-me/ --namespace python-crash-me-dev --values .helm/python-crash-me/values.yaml

#Start the build
oc start-build python-crash-me

#Rollout out the deployment
oc rollout latest dc/python-crash-me

#To simulate a rollout to QA
oc new-project python-crash-me-qa

#Create the QA deployment resources
helm upgrade --install python-crash-me .helm/python-crash-me/ --namespace python-crash-me-qa --values .helm/python-crash-me/values-qa.yaml

#Tag the images from DEV to QA
oc tag python-crash-me-dev/python-crash-me:latest python-crash-me-qa/python-crash-me:latest

#Rollout to QA
oc rollout latest dc/python-crash-me