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