Developed a simple python based application using Flask. It is connecting to mysql database and returning the records in json format as response.

Application performs:

• REST Endpoint at /guests and returns the following output everytime after reading from database

GET /guests

[
    {
        "email": "[email protected]",
        "firstname": "Unnati",
        "lastname": "Shukla"
    },
    {
        "email": "[email protected]",
        "firstname": "Bhaumik",
        "lastname": "Shukla"
    }
]

There are the components included in the solution

• Python
• Mysql
• Minikube & Kubectl
• Docker
• Helm

• Choose Flask on Python for its simplicity for building REST API
• Using MySQL as database, loading initital data from ConfigMap and attached a PVC (500mb)
• Kubernetes YAML files are located in “deployments directory”
• Helm Chart is located as under “deployments/helm” directory
• Using K8S secret to store database credentials.

I've prepared the helm chart. it will be easy for you to install and run the application which start communicating with DB. Helm has not any hardcoded secrets for DB.

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-darwin-amd64
sudo install minikube-darwin-amd64 /usr/local/bin/minikube

brew install helm

First you need to clone the repository

git clone https://github.com/bhaumikshukla/app-python-kubernetes-re.git

Start minikube

minikube start --vm=true --driver=hyperkit

Enable ingress

minikube addons enable ingress

kubectl create secret generic mysql-pass --from-literal=password='my_secret_pw'

helm install example ./helm --set app.host=<fqdn> --set app.db_pw_secret=mysql-pass

OR

cd deployments
helm install example ./helm  -f helm/values.yaml

Feel free to use the postman to check the endpoint /guests is running. Make sure to take care about mentioning host in Header of the request.

Get the IP address to request

kubectl get ing

This will show the IP address of the Ingress example:

NAME          CLASS    HOSTS             ADDRESS        PORTS   AGE
api-ingress   <none>   api.bshukla.com   192.168.64.2   80      14h

Sample Request:

curl --location --request GET 'http://192.168.64.2/guests' \
--header 'Host: api.bshukla.com'

Response I receive is:

[
    {
        "email": "[email protected]",
        "firstname": "Unnati",
        "lastname": "Shukla"
    },
    {
        "email": "[email protected]",
        "firstname": "Bhaumik",
        "lastname": "Shukla"
    }
]