Docker Container on Amazon Linux EC2

Architecture

Overview

The objective of this assignment is to deploy a two-tiered web application with web and database components running as containers on Amazon EC2. The application will be hosted on AWS EC2 instances deployed into a public subnet in the default VPC for simplicity in debugging.

This assignment comprises three main parts:

1. Configuring GitHub Actions: Automatically build and publish container images. Both the application and MySQL DB images should be published to Amazon ECR.

2. Running Web Application Instances: Deploy three instances of the web application on Amazon EC2.

3. Updating and Re-deploying the Application: Manage updates to the application code and re-deploy it on Amazon EC2.

Tools and Services Used

• GitHub Actions: Create Docker images and push them to Amazon ECR automatically.
• Amazon ECR: Securely store your container images.
• Cloud9 IDE : Develop application and build container images.
• Docker CLI: Work with Docker containers.
• AWS EC2: Host your containerized application.
• AWS IAM (Identity and Access Management): Grant EC2 instance access to Amazon ECR.
• Terraform: Deploy the required infrastructure.

Step 1: Docker Installation on Cloud9

Docker Installation

sudo yum update -y
sudo yum install docker -y
sudo systemctl start docker
sudo systemctl status docker

Step 2: Configuring Access

sudo chmod 666 /var/run/docker.sock
sudo usermod -a -G docker ec2-user

Step 3: Configure AWS Keys

aws configure
sudo vi ~/.aws/credentials

Step 4: Add GIT Secrets in Your GitHub

Step 5: Terraform Configuration

Move to the Terraform folder and generate an assignment1 key pair file using the following command:

ssh-keygen -t rsa -f assignment1
terraform init
terraform plan
terraform apply -auto-approve

Step 6: Pull Image from Amazon ECR

Once the image is successfully pushed from GitHub to Amazon ECR clo835-ecr-assignment1, Docker login using the following commands:

docker pull db_uri
docker pull App_uri

Step 7: Docker Create and Run

docker network create -d bridge ranjith-network
docker run -d --network ranjith-network -e MYSQL_ROOT_PASSWORD=pw uri
docker inspect <container_id>

Step 8: Exporting Keys

export DBHOST=172.18.0.2
export DBPORT=3306
export DBUSER=root
export DATABASE=employees
export DBPWD=pw

Step 9: Run Application in Website

export APP_COLOR=blue
docker run -p 8081:8080 --name blue --network=ranjith-network -e APP_COLOR=$APP_COLOR -e DBHOST=$DBHOST -e DBPORT=$DBPORT -e DBUSER=$DBUSER -e DBPWD=$DBPWD [uri]

export APP_COLOR=pink
docker run -p 8082:8080 --name pink --network=ranjith-network -e APP_COLOR=$APP_COLOR -e DBHOST=$DBHOST -e DBPORT=$DBPORT -e DBUSER=$DBUSER -e DBPWD=$DBPWD uri

export APP_COLOR=lime
docker run -p 8083:8080 --name lime --network=ranjith-network -e APP_COLOR=$APP_COLOR -e DBHOST=$DBHOST -e DBPORT=$DBPORT -e DBUSER=$DBUSER -e DBPWD=$DBPWD uri

Step 10: Accessing Database in Docker

docker exec -it <container_name> /bin/bash
mysql -u root -p employees