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manoj-ravidas wants to merge 39 commits into TrainWithShubham:master from manoj-ravidas:master

2026/day-01/learning-plan.md

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+    ## Task
+    **Today’s goal is to set the foundation for your DevOps journey**.
+    I will create a 90-day personal DevOps learning plan that clearly defines:
+        What is your understanding of DevOps and Cloud Engineering?
+        Why you are starting learning DevOps & Cloud?
+        Where do you want to reach?
+        How you will stay consistent every single day?
+    This is not a generic plan.
+    This is your career execution blueprint for the next 90 days.
+    ---
+    # What is your understanding of DevOps and Cloud Engineering?
+    - **Devops** is set of practice that helps development and oprationteams work together by improving collabration and automation
+    the main goal of devops is faster delivery better quality and stable applicationdeployments through the automation.
+    it help to faster automation
+    ---
+    # Why you are starting learning DevOps & Cloud
+    - I started learning DevOps and Cloud because I want to grow my career in IT and work on modern technologies.
+    Today, most companies are moving their applications to the cloud and using DevOps tools to deploy software faster and more reliably.
+    DevOps helps in automation, CI/CD pipelines, and faster deployments, which reduces manual work and errors.
+    Cloud helps us to create servers easily, scale applications, and reduce infrastructure cost.
+    By learning DevOps and Cloud, I can:
+    Work on real-world projects
+    Improve my technical skills
+    Get better job opportunities
+    Become more confident in production environments
+    That’s why I decided to start learning DevOps & Cloud..
+    # Where do you want to reach?
+    I want to become a skilled DevOps/Cloud Engineer, work on real production systems, and grow into a senior role over time.i
+    # How you will stay consistent every single day?
+    I will stay consistent by daily practice, small achievable goals, and learning something new every day.

2026/day-02/linux-architecture-notes.md

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+    ## Task
+    Day 02 – Linux Architecture, Processes, and systemd
+    Task
+    Today’s goal is to understand how Linux works under the hood.
+    You will create a short note that explains:
+        The core components of Linux (kernel, user space, init/systemd)
+        How processes are created and managed
+        What systemd does and why it matters
+    This is the foundation for all troubleshooting you will do as a DevOps engineer.
+    ---
+    # Core Components of Linux
+    **Kernel**
+    The kernel is the core of Linux. It manages hardware resources such as CPU, memory, disk, and network, and acts as a bridge between hardware and applications.
+    **User Space**
+    User space is where users and applications run. It includes the shell, system commands, and application software. User space cannot access hardware directly and communicates with it through the kernel.
+    **Init / systemd**
+    Init or systemd is the first process that starts when the system boots. It manages system services, starts them at boot time, and keeps the system running smoothly.
+    # How processes are created and managed
+    A process is created when we run a command or start a program.
+    Linux creates a process, gives it a PID, and starts running it.
+    Linux manages processes by:
+    Deciding which process runs first
+    Giving CPU time to each process
+    Controlling process states like running or sleeping

2026/day-03/linux-commands-cheatsheet.md

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+    # Linux Commands Cheat Sheet
+    ## Process Management
+    ### Viewing Processes
+    - `ps aux` - Display all running processes with detailed information
+    - `top` - Real-time view of system processes and resource usage
+    - `htop` - Interactive process viewer (enhanced version of top)
+    - `pgrep <name>` - Find process ID by name
+    - `pidof <name>` - Get PID of a running program
+    ### Managing Processes
+    - `kill <PID>` - Terminate a process by PID
+    - `killall <name>` - Kill all processes by name
+    - `pkill <pattern>` - Kill processes matching a pattern
+    - `bg` - Resume a suspended job in the background
+    - `fg` - Bring a background job to foreground
+    - `jobs` - List all background jobs
+    - `nohup <command> &` - Run command immune to hangups
+    ### Process Priority
+    - `nice -n <priority> <command>` - Start process with specified priority
+    - `renice <priority> -p <PID>` - Change priority of running process
+    ---
+    ## File System
+    ### Navigation & Listing
+    - `pwd` - Print current working directory
+    - `ls -lah` - List files with details, including hidden files
+    - `cd <directory>` - Change directory
+    - `tree` - Display directory structure in tree format
+    ### File Operations
+    - `cp <source> <dest>` - Copy files or directories
+    - `mv <source> <dest>` - Move or rename files
+    - `rm -rf <file/dir>` - Remove files or directories recursively
+    - `touch <filename>` - Create empty file or update timestamp
+    - `mkdir -p <path>` - Create directory with parent directories
+    ### File Viewing & Editing
+    - `cat <file>` - Display file contents
+    - `less <file>` - View file contents page by page
+    - `head -n 10 <file>` - Show first 10 lines of file
+    - `tail -f <file>` - Follow file output in real-time (useful for logs)
+    - `grep <pattern> <file>` - Search for pattern in file
+    ### File Permissions
+    - `chmod 755 <file>` - Change file permissions
+    - `chown user:group <file>` - Change file owner and group
+    - `ls -l` - View file permissions and ownership
+    ### Disk Usage
+    - `df -h` - Show disk space usage in human-readable format
+    - `du -sh <directory>` - Show directory size
+    - `find <path> -name <pattern>` - Find files by name
+    ---
+    ## Networking Troubleshooting
+    ### Network Connectivity
+    - `ping <host>` - Test connectivity to a host
+    - `curl <url>` - Transfer data from or to a server
+    - `wget <url>` - Download files from the web
+    - `traceroute <host>` - Show the route packets take to reach host
+    - `mtr <host>` - Combined ping and traceroute tool
+    ### Network Configuration
+    - `ip addr` - Show IP addresses and network interfaces
+    - `ip link` - Show network interface status
+    - `ip route` - Display routing table
+    - `ifconfig` - Legacy command to configure network interfaces
+    ### DNS & Ports
+    - `dig <domain>` - Query DNS records
+    - `nslookup <domain>` - Query DNS server for domain information
+    - `host <domain>` - DNS lookup utility
+    - `netstat -tulpn` - Show listening ports and connections
+    - `ss -tulpn` - Socket statistics (modern netstat alternative)
+    - `lsof -i :<port>` - Show which process is using a port
+    ### Network Testing
+    - `telnet <host> <port>` - Test TCP connectivity to specific port
+    - `nc -zv <host> <port>` - Check if port is open (netcat)
+    ---
+    ## System Information
+    - `uname -a` - Display system information
+    - `uptime` - Show system uptime and load average
+    - `free -h` - Display memory usage
+    - `lscpu` - Show CPU architecture information
+    - `systemctl status <service>` - Check status of a systemd service
+    ---
+    ## Quick Reference Notes
+    ### Most Used for DevOps Troubleshooting:
+. **Logs**: `tail -f /var/log/syslog` - Monitor system logs in real-time
+. **Process**: `ps aux | grep <name>` - Find specific running process
+. **Network**: `netstat -tulpn` - Check what's listening on which port
+. **Disk**: `df -h` - Quick disk space check
+. **Service**: `systemctl restart <service>` - Restart a failing service.
+    ### Pro Tips:
+    - Use `|` (pipe) to chain commands: `ps aux | grep nginx`
+    - Use `>` to redirect output to file: `ls -l > output.txt`
+    - Use `>>` to append to file: `echo "log" >> file.log`
+    - Use `&&` to run commands sequentially: `cd /tmp && ls`
+    ---
+    **Created for**: 90 Days of DevOps Challenge - Day 03
+    **Focus**: Commands for production troubleshooting and incident response

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