📊 Monitoring Processes & System Health
Learn how Linux professionals monitor running applications, performance, and system resources.
🚨 Website Running Slow?
Users complain:
- Website is slow
- Application freezes
- Login page takes forever
The first question isn’t:
“Did hackers attack us?”
The first question is:
“What’s happening on the server?”
⚙ What Is A Process?
A process is simply:
A running program
Examples:
- Web Server
- Database
- SSH Service
- Monitoring Agent
- Terminal Session
Every active application creates one or more processes.
🔍 View Running Processes
One of the most common Linux commands:
ps aux
This displays:
- Running processes
- Users
- CPU usage
- Memory usage
📈 Real-Time Monitoring
View live system activity:
top
Shows:
- CPU utilization
- Memory usage
- Running processes
- System load
Many administrators start troubleshooting with top.
🔥 Tool Spotlight: htop
Many professionals prefer:
htop
Why?
- Cleaner interface
- Easier navigation
- Colorful resource charts
- Interactive process management
Think of it as a modern version of top.
🧠 Memory Usage
Check RAM usage:
free -h
The -h means:
Human Readable
Much easier to understand than raw numbers.
💾 Disk Space
Check storage usage:
df -h
Example problems:
- Disk full
- Logs consuming storage
- Applications unable to write files
Disk issues cause many outages.
⏱ System Uptime
Check system availability:
uptime
Shows:
- System running time
- Current load
- Connected users
🚨 Real Investigation Example
Website becomes slow.
Administrator checks:
top free -h df -h
Finds:
Disk Usage: 100%
Root cause:
Application logs consumed all available storage.
⚙ System Services
Modern Linux systems use services for:
- Web Servers
- Databases
- SSH Access
- Monitoring Tools
View service status:
systemctl status ssh
This command is used daily by administrators.
⚡ Health Check Toolkit
ps aux top htop free -h df -h uptime systemctl status
🎯 10-Minute Health Check Lab
ps aux top free -h df -h uptime
Try identifying:
- CPU usage
- Available memory
- Disk usage
- System uptime
💼 What Professionals Actually Monitor
- CPU Utilization
- Memory Usage
- Disk Space
- Application Health
- Service Availability
- System Load
Monitoring is one of the most important operational skills.
🏆 Key Lesson
Most outages are not discovered by guessing.
They’re discovered through visibility.
The better you understand system health, the faster you can solve problems.
Visibility Creates Control
🌐 Linux Networking Essentials
Learn how Linux connects to networks and discover the commands administrators use daily to troubleshoot connectivity issues.
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