DevOps Real Time Scenarios: Part 1

In this blog we will go through the DevOps Engineer daily life scenarios from basic level to Advance scenarios with solution.

We will Bash Scripting to automate the tasks and we can use other tools like Ansible, Python and PowerShell and many More

1. How can we improve the deployment process?

One potential solution is to automate as much of the deployment process as possible using tools like Jenkins or Ansible. This can reduce the time and effort required to deploy new code and reduce the risk of human error.

2. How can we improve the reliability of our applications?

Some potential solutions include implementing monitoring and alerting systems, conducting regular system and security updates, and setting up a rollback strategy in case of failures.

3. How can we reduce the time it takes to resolve issues?

One potential solution is to implement a centralized logging system, which can make it easier to identify and troubleshoot issues. Another solution is to implement a system for quickly rolling back changes that cause problems.

4. How can we improve communication and collaboration within the team?

Some potential solutions include setting up regular team meetings, using collaboration tools like Slack or Trello, and establishing clear roles and responsibilities for each team member.

5. A script to check the status of a service:

#!/bin/bash

# Check the status of the service
service=myservice
if systemctl is-active --quiet $service; then
    echo "$service is running."
else
    echo "$service is not running."
fi

6. A script to create a new user and add them to the sudo group:

#!/bin/bash

# Create a new user
user=newuser
password=newpassword
useradd -m $user
echo "$user:$password" | chpasswd

# Add the user to the sudo group
usermod -aG sudo $user

7. A script to update and upgrade all installed packages:

#!/bin/bash

# Update the package list
apt update

# Upgrade all installed packages
apt upgrade -y

8. A script to create a backup of a database:

#!/bin/bash

# Set the database credentials
db_user=user
db_password=password
db_name=database

# Create a backup of the database
mysqldump -u $db_user -p$db_password $db_name > db_backup.sql

9. A script to monitor the disk space of a server

#!/bin/bash

# Set the threshold for disk space usage (in percent)
threshold=90

# Get the current disk space usage
usage=$(df / | awk '{ print $5 }' | tail -n 1 | sed 's/%//')

# Check if the usage is above the threshold
if [ $usage -gt $threshold ]; then
    # Send an alert if the threshold is exceeded
    echo "Error: Disk space usage is above the threshold." | mail -s "Alert: Low disk space" admin@example.com
fi

10. A script to automate the installation of a web server:

#!/bin/bash

# Update the package list and install Apache
apt update
apt install apache2 -y

# Enable the Apache service to start on boot
systemctl enable apache2

# Start the Apache service
systemctl start apache2

11. A script to display the top 10 processes by memory usage

#!/bin/bash

# Display the top 10 processes by memory usage
ps aux --sort=-%mem | head -n 11

12. A script to create a new MySQL database and user

#!/bin/bash

# Set the database credentials
db_user=root
db_password=password

# Create a new database and user
mysql -u $db_user -p$db_password << EOF
CREATE DATABASE newdatabase;
CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'newpassword';
GRANT ALL PRIVILEGES ON newdatabase.* TO 'newuser'@'localhost';
EOF

13. A script to download and install a package from the command line.

#!/bin/bash

# Set the package name and download URL
package=package.deb
url=https://example.com/package.deb

# Download the package
wget $url

# Install the package
dpkg -i $package

# Remove the package file
rm $package

14. A script to check if a port is open on a remote server.

#!/bin/bash

# Set the server address and port number
server=1.2.3.4
port=80

# Check if the port is open
nc -z $server $port

if [ $? -eq 0 ]; then
    echo "Port $port is open on $server."
else
    echo "Port $port is closed on $server."
fi

15. A script to check if a package is installed.

#!/bin/bash

# Set the package name
package=package

# Check if the package is installed
if dpkg -s $package > /dev/null 2>&1; then
    echo "$package is installed."
else
    echo "$package is not installed."
fi