The assesmentbdiplus's intro from kiranteja623

QUESTION:

Use case: Need to create a 3-tier web application using Docker + Kubernetes utilizing any of their favorite Infrastructure as Code. It can be a dummy application or hello world too. But should be able to demonstrate the understanding of the technologies. ANSWER:

Basic 3 tier of an application consists of 3 layers
1. The presentation layer
1. application layer
1. database layer
The architecture of the deployment is
1. presentation layer of the application represents the UI, and provides the user interface for interaction and the display of information. This layer could be a web application, mobile application, or a third-party application consuming your services.
1. An application layer is an abstraction layer that specifies the shared communications protocols and interface methods used by hosts in a communications network. An application layer abstraction is specified in both the Internet Protocol Suite (TCP/IP) and the OSI model.
1. Database layer consists of a database which is attched to application for data storage.
For the purpose iam taking the Python flask application whichh consists of an application and mysql database. referhere
I have already build the docker image and pushed it into the docker repository referhere.
For the deployment of this application i am using the EKS k8s cluster. The eks cluster is created through eksctl.
Then i have created two types of pods
a. One is the pod which contains the application.
b. Second one is the pod which contains the mysql pod.
For this application i have taken the aws infrastucture through Terraform.
The instance for building docker image was built through terraform.
For creating cluster through eksctl we have following steps
1. Create a linux instance, install aws cli, create iam credentials
1. install kubectl Referhere
1. Install eksctl referhere
1. Create a file called as cluster.yaml with the following content

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: basic-cluster
  region: us-west-2

nodeGroups:
  - name: basic
    instanceType: t2.large
    desiredCapacity: 2
    volumeSize: 20
    ssh:
      allow: true # will use ~/.ssh/id_rsa.pub as the default ssh key