omarelsheekh / DevOps-Challenge

DevOps-Challenge

This challenge is divided into two parts:

Part-1: Programming

Create a simple REST API using your preferred programming language that does the following:

• It responds to the URL like http://host-ip/ and returns: Hello World, I'm Omar
• responds to the URL like http://host-ip/?n=x and returns n*n
• It responds to the URL like http://host-ip/ip with the IP address of the client making the request and save that IP address on Postgres
• It responds to the URL like http://host-ip/allips with all of the saved IP addresses after retrieving it from Postgres.
• The app is served via a wsgi handler. Like uWSGI
• The Application is Dockerized.

Part-2: Deployment

there are several options to deploy the app

• Using Docker

• Kubernetes deployment

• On-premise deployment

Using Docker

in this option we will use sqlite database

1. Install Docker
2. Clone this repo

git clone https://github.com/omarelsheekh/DevOps-Challenge

3. Build the docker image

docker build -t <image name> DevOps-Challenge/app/

4. Run the docker image

docker run -e "db_type=sqlite" -dp 5000:5000 -p 9191:9191 <image name>

Kubernetes deployment

1. Install Docker on all machines
2. Install kubectl on machines you will run commands from
3. Setup a K8s cluster, you can pick one of these options
   • create a new cluster using Rancher
   • create a new cluster using minikube , make sure to enable the NGINX Ingress controller in minikube

     minikube addons enable ingress

4. Install helm on machines have kubectl installed

   curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash

5. Clone this repo

   git clone https://github.com/omarelsheekh/DevOps-Challenge

6. Build the docker image

   docker build -t <image name> DevOps-Challenge/app/

7. move to helm-chart directory

   cd DevOps-Challenge/helm-chart

8. Run the app helm chart

   helm install --set app.image=<image name> app .

   • warning: if you running it on minikube you have to set affinity to ""

     helm install --set app.affinity="" --set postgresql.affinity=""  --set app.image=<image name> myapp .

9. Verify the IP addresses is set to the ingress:

   $ kubectl get ingress
   NAME                CLASS    HOSTS   ADDRESS        PORTS   AGE
   myapp-app-ingress   <none>   *       192.168.49.2   80      9m13s

10. Verify that the Ingress controller is directing traffic

    $ curl 192.168.49.2/
    Hello World, I\'m Omar

On-premise deployment

Using the automation tool (Terraform) prepare a FULLY provisioned environment.

This automation should:

• Provision 3 nodes on Azure, On these 3 nodes deploy:
  1. The API
  2. DB Master (PostgreSQL)
  3. DB Slave (PostgreSQL) and Setup master-slave (streaming replication) PostgreSQL between node 2 and 3.
• Deploying the Dockerized API on the App node

Getting Started

1. Install Terraform
2. Install azure Cli
3. log in to your azure account

   az login

4. Make Sure that your subscription is active

   $ az account list
   
   [
     {
       "cloudName": "AzureCloud",
       "homeTenantId": "f6****22-84be-48a6-b**c-c0*******1f1",
       "id": "b7*****1-475c-41a6-a**2-d********f1c",
       "isDefault": true,
       "managedByTenants": [],
       "name": "Azure for Students",
       "state": "Enabled",
       "tenantId": "f6****22-84be-48a6-b**c-c0*******1f1",
       "user": {
         "name": "[e-mail]",
         "type": "user"
       }
     }
   ]

5. Install Ansible
6. Clone this repo

   git clone https://github.com/omarelsheekh/DevOps-Challenge

7. Change your directory to the repo

   cd DevOps-Challenge

8. Change default variables in variables.tf if you want

Start Building All Infra in One Command

./create-infra.sh

Destroy Infra Whenever you want

./destroy-infra.sh