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2026/day-01/learning-plan.md

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+# My 90 Days DevOps Learning Plan
+
+## Current Level
+
+I am a student learning DevOps and cloud technologies.
+
+## Why I Started DevOps
+
+I want to build strong practical skills and become a DevOps engineer.
+I also want to make my parents proud.
+
+## My Goals
+
+- Improve Linux and Docker skills
+- Learn CI/CD and Kubernetes
+- Build real DevOps projects used at industry level
+
+## Skills I Want to Build
+
+- Linux troubleshooting
+- CI/CD pipelines
+- Cloud and Kubernetes basics
+
+## Daily Consistency Plan
+
+I will practice daily for 2–3 hours and stay consistent during this 90 Days Challenge.

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

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+# My 90 Days DevOps Challenge
+
+# Linux Architecture
+
+linux has kernal and user space
+
+- kernal manage hardware
+- user space is where user run application
+- systemd use for cheacks logs and manage background services
+
+# Process
+
+process isa runnig program
+
+process States:
+
+- running
+- slepping
+- zombie
+
+# systemd
+
+- start services 
+- stop service
+- restart service
+
+Example - systemctl status mysql
+
+# Today Important cmd
+
+- ls :- list file and director
+- cd :- change directory go to another folder
+- pwd :- present workig directory #to see where we now
+- cat :- to show the content in the file 
+- ls -a :- list all files in the current directory 
+- sudo apt update : use for update system
+- head -n 2 : shows the last 2 lines 
+- tail -n -2 : shows the last 2 lines 
+
+## Linux Architecture and sytemd are important for DevOps Troubleshooting.

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

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+# My 90 Days of Devops challenge
+
+# Process Management
+
+ps - show running process
+
+top - moniter running live process
+
+pgrep bash - find process id by name
+
+nohup - run the process after logout
+
+
+
+## File system
+
+pwd - present working directory
+
+ls - list file or directory
+
+mv - move or remname file or directory
+
+cp - copies file and directory one place to another
+
+rm - delete file or directory permanently
+
+cat - disply content in the file on terminal
+
+df -h shows disk space uses in "human-redable" format (GB/MB)
+
+
+
+## Networking Troublshooting
+
+ping - cheack internet/network connectivity
+
+ip addr - shows IP address and network interfaces
+
+curl - fetch website data
+
+ifconfig - shows network interface information
+
+

2026/day-04/linux-practice.md

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+# My 90 Days of Devops Challenge
+
+## Process Cheacks
+
+- ps aux - shows all running process
+
+- pgrep ssh - show ssh process PID
+
+- top - real-time monitoring
+
+
+
+## Service Cheacks
+
+- systemctl list-unit - shows running services
+
+- system status ssh - cheacks ssh service stause
+
+- sudo start ssh - start ssh service
+
+
+
+## Log Checks
+
+- journalctl -u ssh - shows ssh service logs 
+
+- tail -n 50 /var/log/syslog - system-wide logs
+
+
+
+## Mini Trobleshooting steps
+
+- cheacked running process using ps and pgrep
+
+- cheack service status to use of systemctl status ssh
+
+- cheacked service logs using journalctl -u ssh
+
+- viewed system logs using syslog
+
+- cheack last 50 active logs useing tail -n 50 command
+
+
+## Learning Summary
+
+- Today I learned how to cheack processess, services , and logs in linux. I alos understand how troublshooting works using system commands.
+
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2026/day-05/linux-troubleshooting-runbook.md

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+## My 90 Days Devops challenge
+
+# Linux Troubleshooting Runbook (Day 05)
+
+## Target Service: SSH (sshd)
+
+---
+
+## CPU & Memory
+top  
+→ check CPU usage
+
+free -h  
+→ check RAM usage
+
+---
+
+## Disk
+df -h  
+→ check disk space
+
+du -sh /var/log  
+→ check log folder size
+
+---
+
+## Network
+ss -tulpn  
+→ check open ports + services
+
+curl -I http://13.232.73.184  
+→ check website status (200 = OK)
+
+---
+
+## Logs
+
+journalctl -u ssh -n 50  
+→ SSH service logs
+
+tail -n 50 /var/log/auth.log  
+→ login + sudo + SSH logs
+
+---
+
+## Quick Meaning
+
+journalctl → service logs  
+tail → file logs  
+ss → ports  
+df → disk  
+free → memory  
+curl → website check  
+
+---
+
+## If issue happens
+
+restart service:
+sudo systemctl restart ssh
+
+check live logs:
+journalctl -u ssh -f
+
+check failed logins:
+grep "Failed" /var/log/auth.log

2026/day-06/file-io-practice.md

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+## My 90 days challenge
+
+# Day 06 – Linux File I/O Practice
+
+## Objective
+
+Learn basic file read and write operations in Linux using simple commands.
+
+---
+
+## Commands Practiced
+
+### 1. Create file
+
+```bash
+touch notes.txt
+```
+
+Creates an empty file named `notes.txt`.
+
+---
+
+### 2. Write first line (overwrite)
+
+```bash
+echo "Line 1" > notes.txt
+```
+
+* `>` = write and replace old content
+
+---
+
+### 3. Add second line (append)
+
+```bash
+echo "Line 2" >> notes.txt
+```
+
+* `>>` = add without deleting old content
+
+---
+
+### 4. Add third line using tee
+
+```bash
+echo "Line 3" | tee -a notes.txt
+```
+
+* `tee -a` = add text + show output on screen
+
+---
+
+### 5. Read full file
+
+```bash
+cat notes.txt
+```
+
+Shows entire file content.
+
+---
+
+### 6. Show first 2 lines
+
+```bash
+head -n 2 notes.txt
+```
+
+---
+
+### 7. Show last 2 lines
+
+```bash
+tail -n 2 notes.txt
+```
+
+---
+
+## Key Learnings
+
+* `>` overwrites file content
+* `>>` appends new data
+* `cat` reads full file
+* `head` shows top lines
+* `tail` shows bottom lines
+* `tee` writes + displays output
+
+---
+
+## Why This Matters
+
+File handling is very important in DevOps:
+
+* logs
+* configs
+* scripts
+
+Fast file handling = faster debugging 🚀
+
+---
+
+## End of Day 06