Episode 2 : 2 Tier Application Deployment🔥

Hello, learners in today's topic we will deploy a 2-Tier Application Deployment with the Help of Various DevOps Tools.

📌 Prerequisites

Here are some prerequisites for this project are given below:

• AWS EC2

• Git & GitHub

• Docker

• DockerHub

📌 Create an Ec2 instance

• Log in to your AWS account with username and Password.

  

• Click on the Launch instance option on the right side.

• Now give the instance name and choose operating system image.

• Select the instance type (t2.micro) and create a new key pair.

• Now configure the network setting, storage and then launch your instance.

• Now click on the Connect Button when your instance is in the Running Condition.

📌 Installing, configuring and troubleshooting the application

• First, ssh your instance then run the following command for the Package update and Docker Installation.

    ssh -i "docker.pem" ubuntu@<public_dns>
    or
    ssh -i <"key_name"> <user_name>@<public-ip>
  

    sudo apt-get update -y ; sudo apt install docker.io -y
  

Run the following command for the Package update and Docker Installation.

• Troubleshoot the docker permission denied problem.

  

• Clone the Repository from the git hub, copy the SSH and paste it into the terminal here is the command.

https://github.com/dushyantkumark/two-tier-flask-app.git

• Write a Docker for the Python installation and Mysql Client.

# Use an official Python runtime as the base image
FROM python:3.9-slim

# Set the working directory in the container
WORKDIR /app

# install required packages for system
RUN apt-get update \
    && apt-get upgrade -y \
    && apt-get install -y gcc default-libmysqlclient-dev pkg-config \
    && rm -rf /var/lib/apt/lists/*

# Copy the requirements file into the container
COPY requirements.txt .

# Install app dependencies
RUN pip install mysqlclient
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application code
COPY . .

# Specify the command to run your application
CMD ["python", "app.py"]

• After Writing the Docker file Now build it with the following commands it includes 1/8 Steps which I have Mentioned in the Screenshot.

docker build -t flaskapp-2tier .
docker images

• Now Run the docker Container with the help of Docker images with Port Number with the help of the Below command.

docker run -d -p 5000:5000 flaskapp-2tier:latest
docker ps

• Now open the Port in our Security Groups for Incoming Traffic and allow port no 5000.

• Now Access the app with the help of the Public IP of Ec2 Instance with port no here is the Syntax:-

http://13.232.124.66:5000

We need to create a MySQL Container.

docker run -d -p 3306:3306 --name mysql -e MYSQL_ROOT_PASSWORD="myadmin" mysql:5.7
docker ps

• Now Access the app with the help of the Public IP of Ec2 Instance with port no here is the Syntax:-

    http://13.232.124.66:5000
  

Both containers are not communicating with each other because both containers are not in the same network. To solve this problem we have to create a custom bridge network.

• We need to create a docker network 2tier to connect MySQL Container and MySQL Database.

docker network create twotier
docker network ls

• Stop previous running containers, before creating new containers.

    docker kill <container-id-1> <container-id-2>
    docker rm <container-id-1> <container-id-2>
  

  

• As per the Diagram need a MySQL Container with username and Password to use these commands to run I have to use the Environment Variable in these with -e.

sudo docker run -d -p 5000:5000 --network=twotier -e MYSQL_HOST=mysql -e MYSQL_USER=root -e MYSQL_PASSWORD=myadmin -e MYSQL_DB=myDb flaskapp-2tier:latest

• As per the Diagram need a MySQL Database username and Password use these commands to run I have used the Environment Variable in these with -e and run the mysql image latest.

sudo docker run -d -p 3306:3306 --network=twotier -e MYSQL_DATABASE=myDb -e MYSQL_USER=admin -e MYSQL_PASSWORD=admin -e MYSQL_ROOT_PASSWORD=admin mysql:5.7
docker ps

As per the Diagram need a MySQL Database username and Password to use these commands to run I have used the Environment Variable in these with -e and run the MySQL image latest Diagram.

• Check the Network of Both Containers and Inspect both containers on the Network with the help of the below command.

docker network ls 
docker network inspect twotier

• Now your MySql Container and MySql Database are connected.

    http://13.232.124.66:5000
  

  

• Create the Message table in your MySQL Database but before creating a table access the MySql Database and then enter in the mysql with the following commands.

sudo docker exec -it <container-id> bash
sudo mysql -u root -p
enter password

• Check the Databases, use myDb and then create a table with the help of the following commands. use the syntax directly copy and paste to your terminal.

show databases;
use myDb;

CREATE TABLE messages (
    id INT AUTO_INCREMENT PRIMARY KEY,
    message TEXT
);

• After Creating the table access your 2-Tier Flask Deployment App on your browser: with the help of the following syntax:

http://<ec2-instance-public-ip>:5000
http://13.232.124.66:5000

• Add some messages and submit them for testing purposes.

• Verify that data in the database.

📌 Push Your Docker Image To DockerHub

• Login to your docker hub account.

    docker login
    Username: <dockerhub_username>
    Password: <dockerhub_password>
  

• Again tag your docker image with your dockerhub username.

    docker images
    docker tag flaskapp-2tier:latest dushyantkumark/2-tier-flask-app:latest
    docker images
  

• Push your tagged docker image to your docker hub account.

    docker push dushyantkumark/2-tier-flask-app:latest
  

• Check your docker image in the docker hub account.

  

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The above information is up to my understanding. Suggestions are always welcome. Thanks for reading this article.😊

#aws #cloudcomputing #docker #Devops #TrainWithShubham #90daysofdevopsc #happylearning

Follow for many such contents:

LinkedIn: linkedin.com/in/dushyant-kumar-dk

Blog: dushyantkumark.hashnode.dev

GitHub: https://github.com/dushyantkumark/two-tier-flask-app.git