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7/2/2026
How to Let a Vercel App Read a Private ClickHouse on EC2 (Using Cloudflare Tunnel)

How to Let a Vercel App Read a Private ClickHouse on EC2 (Using Cloudflare Tunnel)

Short summary

Step-by-step guide to securely connecting a Vercel app to a private ClickHouse database on EC2 using Cloudflare Tunnel, which creates an outbound-only encrypted connection without opening ports or exposing server IP. Explains four key concepts and walks through setting up the tunnel, managing DNS via a throwaway domain, and configuring the connection. Ideal for DevOps engineers and teams needing secure private database access from cloud-hosted applications.

  • •Cloudflare Tunnel enables outbound-only encrypted connections—no open ports, no exposed server IP
  • •Guide covers ClickHouse, EC2, Vercel, DNS setup, and step-by-step tunnel configuration
  • •Use case: connect cloud-hosted apps and AI agents to private databases securely

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