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Accessing the FastAPI App

Objective​

This guide aims to guide you through the process of accessing your microservices deployed onto EKS cluster. By using ingress object we were able to expose FastAPI service through Application Loadbalancer. The Management of Application Loadbalancer is done by AWS Loadbalancer controller through ingress manifest.

Prerequisites​

Initial Setup​

Navigate to the root directory of the python-fastapi-demo-docker project where your environment variables are sourced:

cd ~/environment/python-fastapi-demo-docker

1. Checking the Status of Pods​

Before we try to access our application, we need to ensure that all of our pods are running correctly. To check the status of all pods, run the following command:

kubectl get pods -n my-cool-app

All your pods should be in the "Running" state. If they're not, you will need to troubleshoot the deployment before proceeding.

2. Getting the ALB URL​

Run the following command to get the ALB URL:

kubectl get ingress -n my-cool-app

The expected output should look like this:

NAME              CLASS    HOSTS   ADDRESS                                                                  PORTS   AGE
fastapi-ingress   <none>   *       k8s-mycoolap-fastapii-8114c40e9c-860636650.us-west-2.elb.amazonaws.com   80      3m17s

3. Accessing the FastAPI Service​

In the previous lab exercise, we used the AWS Load Balancer Controller (LBC) to dynamically provision an Application Load Balancer (ALB). Note that it takes several minutes or more before the ALB has finished provisioning.

  1. Check the status: Open the Load Balancers page on the Amazon EC2 console and select the AWS Region in which your Amazon EKS cluster resides. Next, select your ALB name, such as k8s-mycoolap-fastapii-8004c40e9c.
  2. Open the app: Open a new tab in your browser paste the ALB link, such as k8s-mycoolap-fastapii-8114c40e9c-860636650.us-west-2.elb.amazonaws.com. You should see the welcome page:

4. Verifying the Setup by Adding a Book​

To confirm that everything is functioning as expected, attempt to add a book by selecting the Create a book option.

Conclusion​

This guide has walked you through the steps necessary to access the FastAPI service deployed on an EKS cluster. We've shown you how to check the status of your pods and verify your setup by interacting with the FastAPI service.