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Scaling YaCy: Tips for Running a Fast, Distributed Search Network

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How to Set Up YaCy: A Step-by-Step Guide for Private Search

YaCy is a decentralized, peer-to-peer search engine that lets you run your own search node and contribute to a distributed web index. This guide walks through installing, configuring, and using YaCy on a typical desktop or server (assumes Linux, with notes for Windows/macOS), plus tips for security, performance, and troubleshooting.

What you’ll need

  • A computer or VPS with at least 2 GB RAM (4 GB+ recommended for better crawling/indexing).
  • Java 11 or later installed.
  • 2–10 GB free disk space (more if you plan to index many pages).
  • Basic command-line familiarity.
  • Optional: a static IP or dynamic DNS if you want external peers to connect.

1. Install Java

YaCy runs on Java. Install OpenJDK 11+.

  • Debian/Ubuntu: 
    Code
    sudo apt update sudo apt install openjdk-11-jre-headless
  • CentOS/RHEL: 
    Code
    sudo yum install java-11-openjdk
  • Windows/macOS: install from AdoptOpenJDK/Temurin or use your package manager.

Verify:

Code
java -version

2. Download and extract YaCy

  • Get the latest YaCy release from the official site (choose the .tar.gz for Linux or .zip for Windows/macOS).
  • Linux: 
    Code
    wget https://download.yacy.net/yacy_v1.925_2025-01-01.tar.gz
tar xzf yacy_v1.9252025-01-01.tar.gz cd yacy

    (Replace filename with current release.)

  • Windows: extract the ZIP to a folder.

3. Start YaCy for the first time

  • Linux/macOS: 
    Code
    ./startYACY.sh
  • Windows:
    • Run startYACY.bat or double-click yacy.exe (depending on package).

The first startup initializes data and opens the YaCy web interface at http://127.0.0.1:8090 by default. If it doesn’t open automatically, point your browser to that address.

4. Complete initial configuration

  • When you first access the web UI, set an admin password and choose a nickname for your peer.
  • Accept default ports (8090 for HTTP UI, 8091 for peer communication) or change if needed.
  • Choose storage locations for index and data. For production use, put index/data on a dedicated disk or SSD.

5. Configure network access (optional)

To allow other YaCy peers to connect and to make your node useful to the network:

  • If behind NAT, forward ports 8090 and 8091 from your router to the machine.
  • If you have dynamic IP, set up dynamic DNS and use that hostname in YaCy peer settings.
  • For VPS with firewall, allow TCP ports 8090 and 8091.

Example UFW rules (Ubuntu):

Code
sudo ufw allow 8090/tcp sudo ufw allow 8091/tcp

6. Adjust core settings

In the web UI under “Administration” → “Settings”:

  • Memory: Increase Java heap size if you have more RAM (edit start script or use UI memory settings).
  • Index size: Set maximum index

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