Basic Linux Server Setup

🔹 1. Basic Linux Server Setup

🔐 User & Security

adduser admin

passwd admin

usermod -aG sudo admin

Disable root SSH login:

nano /etc/ssh/sshd_config

PermitRootLogin no

systemctl restart sshd

🌐 2. Network Configuration

Check IP

ip a

Set Static IP (Ubuntu – Netplan)

network:

version: 2

ethernets:

eth0:

dhcp4: no

addresses:

- 192.168.1.10/24

gateway4: 192.168.1.1

nameservers:

addresses: [8.8.8.8, 1.1.1.1]

Apply:

netplan apply

🧱 3. Firewall Configuration

UFW (Ubuntu)

ufw allow ssh

ufw allow 80

ufw allow 443

ufw enable

Firewalld (CentOS)

firewall-cmd --add-service=http --permanent

firewall-cmd --reload

📦 4. Package Management

Ubuntu

apt update && apt upgrade -y

apt install nginx -y

CentOS / RHEL

yum install nginx -y

🌍 5. Web Server Configuration

NGINX

systemctl start nginx

systemctl enable nginx

Check:

curl localhost

🗄️ 6. Disk & Storage

Check disk

df -h

lsblk

Mount disk:

mount /dev/sdb1 /data

Persistent mount:

nano /etc/fstab

🔄 7. Service Management

systemctl status nginx

systemctl restart nginx

systemctl stop nginx

📜 8. Logs & Monitoring

journalctl -u nginx

top

htop

free -m

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