So From 80-90 Day I will be sharing my upcoming DevOps Pipeline Project ranging from Linux Monitoring,Shell Scripting, CI/CD, Docker, Kubernetes, and many more.

Project Overview

In this Linux Monitoring Project, I will be creating a Monitoring Script for Nginx which will be monitoring the status of the Nginx.

What is Nginx ?

• Nginx, pronounced engine-ex began as a web server but has grown to also act as a reverse proxy, caching data from the web, and balancing loads between servers.

How Does Nginx Works ?

• Nginx minimizes memory usage and handles multiple requests simultaneously. It adopts an event-driven model, avoiding the need for new processes per request.

• Nginx employs a master-worker setup where one master process supervises multiple worker processes. Workers handle actual request processing, coordinated by the master.

• Requests are processed asynchronously, allowing each worker to handle requests concurrently without blocking others.

Key Features:

• Acts as a reverse proxy with caching.

• Supports IPv6 and load balancing.

• Provides FastCGI support with caching.

• Handles WebSockets.

• Efficiently serves static files and indexes.

Project

• Step 1: Firstly we will check if the Nginx is installed or not. If not then we will install it.

# Check if Nginx is installed or not if its installed then it will show the path of the Nginx.
which nginx

• Step 2: Now we will install Nginx on the local machine.

sudo apt install nginx -y

• Step 3: Now check the version of Nginx installed.

nginx -v

• Step 4: Now we will see some system commands for Nginx.

# Start Nginx
sudo systemctl start nginx

# Stop Nginx
sudo systemctl stop nginx

# Restart Nginx
sudo systemctl restart nginx

# Check the status of Nginx
sudo systemctl status nginx

• Step 5: Now we will create a Monitoring Script for Nginx.

#!/bin/bash
# This script is used to monitor the status of the Nginx service

# Specify the shell to be used for running the script
SHELL=/bin/bash

# Set the PATH variable to include essential directories
PATH=/sbin:/bin:/usr/sbin:/usr/bin

# Define color variables for output
Red=$'\e[1;31m'
Green=$'\e[1;32m'
Blue=$'\e[1;34m'

# Check the status of the Nginx service and redirect the output to a file
service nginx status > output_file.txt

# Check if the word "running" is present in the output file
if grep -q "running" output_file.txt; then
   echo $Blue "The Nginx Service is running"
   echo $Green $(date +%I)$(date +:%M)$(date +:%S) $(date +%p) $(date +%Z)
else
   # If Nginx is not running, start the service
   if service nginx start; then
      echo $Red  "Nginx Service is starting......"
      sleep .5s
   else
      echo "Failed to start Nginx Service."
   fi
fi

# Remove the temporary output file
sudo rm -f output_file.txt

• Step 7: Now we will make the script executable and run it.

# Make the script executable
chmod 777 monitoring.sh 
# 777 means that the owner, group, and others have read, write, and execute permissions.

• Step 8: Now we will run the script.

./monitoring.sh

• Step 9: Now if the Nginx Service is not running or stopped we get the output as below.

• Step 10: Now if the Nginx Service is not running then we will schedule the script to run every 2 minutes using Cron Job.

# Open the crontab file
crontab -e

• Step 11: Now add the below line to the crontab file to run the script every 2 minutes.

# Run the monitoring script every 5 minutes
*/2 * * * * /home/rohit/monitoring.sh

Thus we have successfully created a Monitoring Script for Nginx and scheduled it to run every 2 minutes using Cron Job using Shell Scripting Automation.

Thank you :)