Install Netdata for Free Real-Time VPS Monitoring

Netdata is the best free real-time server monitoring tool for individual VPS administrators and small teams. It collects CPU, RAM, Disk, and Network metrics every second, displaying them on a beautiful and intuitive dashboard — completely free of charge.

What is Netdata and Why Use It

Netdata is an open-source system monitoring tool developed since 2013, now running on over 1 million systems worldwide. Its key advantages include:

• Real-time at 1-second resolution — see changes instantly, no waiting 30-60 seconds like other tools
• Auto-discovery — automatically detects running services (Nginx, MySQL, Docker, etc.)
• Beautiful dashboard out-of-the-box — no visualization setup required
• Lightweight — uses only 100-200 MB RAM, less than 1% CPU
• 100% Free — Apache 2.0 license, self-hosted with no limitations

System Requirements

Component	Minimum	Recommended
OS	Ubuntu 20.04+ / Debian 10+	Ubuntu 22.04 LTS
RAM	512 MB	1 GB or more
CPU	1 vCore	2 vCore or more
Disk	1 GB (1-day retention)	5 GB (7-day retention)
Port	19999 (local or reverse proxy)	Nginx reverse proxy + HTTPS

All AsiaGB VPS plans starting from 1 GB RAM are fully compatible with Netdata.

Installing Netdata on Ubuntu/Debian

Method 1: Kickstart Script (Recommended — Fastest)

Run the following command on your VPS. Takes approximately 2-5 minutes:

wget -O /tmp/netdata-kickstart.sh https://get.netdata.cloud/kickstart.sh
sh /tmp/netdata-kickstart.sh --stable-channel --disable-telemetry

Flags used:

• --stable-channel — use the stable release, not nightly builds
• --disable-telemetry — disable sending usage statistics to Netdata Inc.

Method 2: Install via Package Manager

# Ubuntu/Debian
curl -fsSL https://packagecloud.io/netdata/netdata/gpgkey | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/netdata.gpg
echo "deb https://packagecloud.io/netdata/netdata/ubuntu/ $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/netdata.list
sudo apt-get update
sudo apt-get install -y netdata

Verify Installation

sudo systemctl status netdata
# Expected: Active: active (running)

Enable Auto-start on Reboot

sudo systemctl enable netdata

Accessing the Dashboard

By default, Netdata listens on port 19999 on all interfaces. Access it immediately at:

http://YOUR_VPS_IP:19999

SSH Tunnel (Most Secure Method)

# Run on your local machine
ssh -L 19999:localhost:19999 user@YOUR_VPS_IP -N

# Then open your browser at
http://localhost:19999

Securing with Nginx Reverse Proxy

Use Nginx as a reverse proxy to access Netdata via HTTPS with basic authentication:

Step 1: Restrict Netdata to Localhost

Edit /etc/netdata/netdata.conf:

[web]
    bind to = 127.0.0.1

sudo systemctl restart netdata

Step 2: Create Nginx Virtual Host

server {
    listen 443 ssl;
    server_name monitor.yourdomain.com;

    ssl_certificate /etc/letsencrypt/live/monitor.yourdomain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/monitor.yourdomain.com/privkey.pem;

    auth_basic "Netdata Monitoring";
    auth_basic_user_file /etc/nginx/.htpasswd;

    location / {
        proxy_pass http://127.0.0.1:19999;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

Step 3: Create Password File

sudo apt install -y apache2-utils
sudo htpasswd -c /etc/nginx/.htpasswd admin

Configuring Alerts

Netdata includes over 400 pre-built alert templates. Configure Telegram notifications in /etc/netdata/health_alarm_notify.conf:

SEND_TELEGRAM="YES"
TELEGRAM_BOT_TOKEN="YOUR_BOT_TOKEN"
TELEGRAM_CHAT_ID="YOUR_CHAT_ID"

sudo systemctl restart netdata

Test Alert

sudo -u netdata /usr/libexec/netdata/plugins.d/alarm-notify.sh test telegram

Key Metrics to Monitor

Category	Metrics	Alert Threshold
CPU	user, system, iowait	iowait > 20% = disk bottleneck
Memory	used, cached, buffered	used > 85% = insufficient RAM
Disk I/O	reads, writes, utilization	utilization > 80% = slowdown
Network	received, sent, packets	bandwidth approaching ISP limit
Load	load1, load5, load15	load15 > number of CPU cores
Processes	running, blocked	blocked > 10 = I/O issue

Netdata vs Prometheus/Grafana and Other Tools

Tool	Setup Ease	Real-time	Resource Usage	Best For
Netdata	⭐⭐⭐⭐⭐ Very Easy	1 second	~150 MB RAM	Individual VPS, SMB
Prometheus + Grafana	⭐⭐ Complex	15+ seconds	500+ MB RAM	Enterprise, clusters
Zabbix	⭐⭐⭐ Moderate	30+ seconds	300+ MB RAM	Enterprise
htop/top	⭐⭐⭐⭐⭐ Very Easy	Real-time	Minimal	Quick debugging, no history

Frequently Asked Questions

Does Netdata work on low-spec VPS?

Yes. Netdata needs only 100-200 MB RAM and less than 1% CPU overhead, suitable for any VPS starting from 1 GB RAM.

Is Netdata truly free?

Netdata Agent is 100% free and open-source under Apache 2.0 license. There is an optional Netdata Cloud for enterprise teams, but self-hosted usage has no limitations.

How do I update Netdata?

sudo /usr/libexec/netdata/netdata-updater.sh

How long does Netdata retain data?

By default, Netdata retains data in memory for approximately 1 hour. You can configure disk-based retention for months using the dbengine mode in /etc/netdata/netdata.conf.

Can I run Netdata in Docker?

docker run -d --name=netdata \
  -p 19999:19999 \
  -v netdataconfig:/etc/netdata \
  -v netdatalib:/var/lib/netdata \
  -v /proc:/host/proc:ro \
  -v /sys:/host/sys:ro \
  --cap-add SYS_PTRACE \
  netdata/netdata

Summary

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