Linux Administration

Core Linux system administration skills.

Package Management

Debian/Ubuntu

apt update && apt upgrade -y apt install nginx apt remove nginx apt autoremove

RHEL/CentOS

dnf update dnf install nginx dnf remove nginx

System Information

uname -a # Kernel info hostnamectl # System info lscpu # CPU info free -h # Memory usage df -h # Disk usage ip addr # Network interfaces

Log Management

journalctl -u nginx # Service logs journalctl -f # Follow logs tail -f /var/log/syslog # System logs dmesg # Kernel messages

Process Management

ps aux | grep nginx top / htop kill -9 <pid> pgrep nginx pkill nginx

Best Practices

• Regular updates

• Minimal installed packages

• Proper file permissions

• Log rotation configuration

• Automated backups