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linux-server-expert

linux-server-expert

github.com/duck4nhCloud & DevOps15611 installsUpdated 37w ago
Repository

About linux-server-expert

A practical reference for Linux server operators, covering initial setup, firewalls, Nginx, SSL, systemd services, and routine troubleshooting commands.

Key features

  1. 01User and SSH setup
  2. 02UFW firewall configuration
  3. 03Nginx reverse proxy setup
  4. 04Certbot SSL configuration
  5. 05systemd service management
  6. 06Log and disk troubleshooting commands

Use cases

  1. 01Prepare a server for deployment
  2. 02Configure a web app proxy and HTTPS
  3. 03Manage app services and inspect logs

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/duck4nh/antigravity-kit --skill linux-server-expert

After installing, type/linux-server-expertin Claude Code to confirm it loaded.

Details

From the project README

Linux Server Expert

Initial Server Setup

# Update system
apt update && apt upgrade -y

# Create user with sudo
adduser deploy
usermod -aG sudo deploy

# SSH key auth
mkdir -p /home/deploy/.ssh
chmod 700 /home/deploy/.ssh
# Add public key to authorized_keys

# Disable root login & password auth
vim /etc/ssh/sshd_config
# PermitRootLogin no
# PasswordAuthentication no
systemctl restart sshd

Firewall (UFW)

ufw default deny incoming
ufw default allow outgoing
ufw allow ssh
ufw allow 80/tcp
ufw allow 443/tcp
ufw enable
ufw status

Nginx Configuration

# /etc/nginx/sites-available/myapp
server {
    listen 80;
    server_name example.com www.example.com;
    
    location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_cache_bypass $http_upgrade;
    }
}

# Enable site
ln -s /etc/nginx/sites-available/myapp /etc/nginx/sites-enabled/
nginx -t && systemctl reload nginx

SSL with Let's Encrypt

apt install certbot python3-certbot-nginx -y
certbot --nginx -d example.com -d www.example.com
# Auto-renewal is set up automatically
certbot renew --dry-run

Systemd Service

# /etc/systemd/system/myapp.service
[Unit]
Description=My App
After=network.target

[Service]
Type=simple
User=deploy
WorkingDirectory=/home/deploy/myapp
ExecStart=/usr/bin/node dist/main.js
Restart=on-failure
Environment=NODE_ENV=production

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl enable myapp
systemctl start myapp
systemctl status myapp

Quick Commands

# Logs
journalctl -u myapp -f          # Service logs
tail -f /var/log/nginx/error.log

# Disk
df -h                           # Disk usage
du -sh /var/*                   # Directory sizes

# Process
htop                            # Process monitor
lsof -i :3000                   # What uses port

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