cicd_assignment

CI/CD pipeline

A step-by-step guide to creating a complete CI/CD pipeline using Bash, Python, and crontabs as per the tasks specified:

Pre-requisites:

1. Visual Studio Code
2. GitHub Account
3. Ec2-Instance/Virtual Machine

#Task1: Setup a Simple HTML Project

Create a new HTML project folder on your local machine. Create an index.html file within the project folder with some essential HTML content.

Example:

<title>Tilak's Home Page</title> Developer

Welcome to Tilak's Home Page

This is CI/CD Assignment

HEROVIRED

Initialize a local Git repository in the project folder (Use Visual Code Studio):

1. git init
2. git config --global user.name
3. git config --global user.email tilak.XXXXX@gmail.com

Create a new repository on GitHub and follow the instructions to link your local repository to the remote one:

Git URL: https://github.com/bpechetti/cicd_assignment.git In My Case the Git Branch in the Main.

Prerequisites:

Make sure you are able to push the code from your local git to the GitHub repository

1. Generate SSH-Keygen on your local Computer (Path: C:\Users\User_Name.ssh\id_rsa.pub)
2. Copy the key from id_rsa.pub
3. Add the SSH key to the associated with your account. a. Click on Git_Hub Account Settings b. Select SSH and GPGKeys in Access. c. Click on New SSH Key d. Add the key.

Task 2: Setup an AWS EC2/Local Linux Instance with Nginx

Launch an AWS EC2 instance or set up a local Linux instance. Install Nginx on the instance:

1. Sudo apt update
2. Sudo apt install nginx
3. Sudo systemctl restart nginx

#Task 3: Write a Python script to check for new commits.

Create a Python script named autodeploy.py and config.py Python code.

import os import requests from config import *

providing the access token

headers = { 'Authorization': f'Bearer {access_token}' }

API URL to get latest commit

url = f'https://api.github.com/repos/{owner}/{repo}/branches/{branch}' response = requests.get(url, headers=headers)

if response.status_code == 200:

latest_commit_hash = response.json()['commit']['sha'] 

else:

print("Error fetching commit hash:", response.text)
latest_commit_hash = None

Check if there's a new commit

previous_commit_hash_file = 'previous_commit_hash.txt'

if os.path.exists(previous_commit_hash_file): with open(previous_commit_hash_file, 'r') as file: previous_commit_hash = file.read().strip() else: previous_commit_hash = None

if latest_commit_hash and latest_commit_hash != previous_commit_hash: print("New commit detected:", latest_commit_hash)

with open(previous_commit_hash_file, 'w') as file:
    file.write(latest_commit_hash + '\n')

else: print("No new commits or no update in index.html file.")

Code for Config.py

access_token = 'github_pat_11ASWJZ4Q0U9ja8aVxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' owner = 'Git_hub User-id' repo = 'CICD_Pipeline' branch ='main' local_repo = 'D:\herovired\CICD\CICD_Pipeline' nginx_path ='/var/www/html/CICD_Pipeline' files_to_copy ='index.html'

#Task 4: Write a Bash Script to deploy the code

Create a Bash script named cicd_code.sh

bashCopy code

#!/bin/bash

Define the variables

GIT_REPO_URL="https://github.com/bpechetti/cicd_assignment.git" # Replace with your Git repository URL WEB_ROOT="/var/www/html/cicd_assignment" # Replace with the path to your web application's root directory NGINX_RESTART_CMD="sudo systemctl restart nginx" # Replace with the appropriate command to restart Nginx

Change to the web root directory

cd "$WEB_ROOT" || exit 1

Clone the latest code from the Git repository

git pull origin main # You can replace 'master' with the branch you want to clone

Check if the Git operation was successful

if [ $? -eq 0 ]; then echo "Code successfully updated from Git repository."

# Restart Nginx
echo "Restarting Nginx..."
$NGINX_RESTART_CMD

# Check if Nginx restart was successful
if [ $? -eq 0 ]; then
    echo "Nginx restarted successfully."
else
    echo "Failed to restart Nginx. Please check the Nginx configuration and try again."
    exit 1
fi

else echo "Failed to update code from Git repository. Please check the Git repository and try again." exit 1 fi Make the script executable:

1. Sudo chmod +x <File_name> I have made changes to Autodeploy.py and cicd_code.sh Files.

#Task5: Setup a Cronjob to Run the Python Script

Open your crontab for editing:

Command: crontab -e

Add the following line to run the Python script every minute:

• • • • • /usr/bin/python3 /var/www/html/cicd_assignment/autodeploy.py > /var/www/html/cicd_assignment/py_output.log 2>&1
• • • • • usr/bin/bash /var/www/html/cicd_assignment/cicd_code.sh > /var/www/html/cicd_assignment/bash_output.log 2>&1

#Task 6: Test the Setup

Make a new commit to your GitHub repository. Wait for the Python script to run via the cron job (after 30 minutes) or manually run it. If the Python script detects a new commit, it will trigger the deployment Bash script. The Bash script will pull the latest code and restart Nginx. Check your Nginx server to ensure the changes have been deployed.

Here in my Project i Created a log files to check if the