Chapter 49: Deployment in C++

Docker, systemd, Vercel, production checklist. In this chapter, you will learn deployment in depth with C++ code examples, explanations, and best practices.

Overview

This chapter covers deployment for Kungfu.js developers using C++. We will start with the basics, move through practical examples, and end with advanced techniques and common pitfalls.

Why This Matters

Understanding deployment is essential because it is a core part of building web applications. Every real-world app needs to handle docker, systemd, vercel, production checklist. Skipping this chapter would leave a gap in your knowledge that would cause problems later.

Code Example

Here is how to handle this in C++:

# Build for production
cargo build --release --features "kungfu-core/io_uring kungfu-core/simd"

# Dockerfile
FROM rust:1.96 AS builder
WORKDIR /app
COPY . .
RUN cargo build --release

FROM debian:bookworm-slim
COPY --from=builder /app/target/release/myapp /usr/local/bin/
EXPOSE 3000
CMD ["myapp"]

Deployment Checklist

• Build with --release flag for optimizations
• Enable io_uring and SIMD features on Linux
• Set acceptor_threads to the number of CPU cores
• Put behind a reverse proxy (nginx/Caddy) for TLS
• Increase file descriptor limit: ulimit -n 1048576
• Set up health checks at /health
• Configure graceful shutdown

Common Mistakes

• Not reading the documentation: Always check the API reference when something does not work as expected.
• Skipping security: Never disable the default middleware unless you have a very good reason. Security is not optional.
• Not testing: Write tests for your handlers. Kungfu.js makes this easy with the built-in test utilities.

Summary

In this chapter, you learned about deployment in C++. You saw code examples, understood how things work under the hood, and learned about common mistakes to avoid.

What is Next?

In chapter 50, we will cover Build a Full-Stack App: Put it all together: a complete project.