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Learn how to expose only the files a WebAssembly module needs, using WASI’s capability model. A step‑by‑step example shows how to pre‑open directories with wasmtime, the differences between Preview 1 and 0.2, and the trade‑offs of using WASI over POSIX.
A concise architecture note showing how to isolate third‑party code using capability‑based WASI imports, minimal host surface, and observable resource limits.
Run Rust utilities server-side with WASI and Wasmtime: portable, sandboxed modules without container weight.
WASI turns WebAssembly into a practical server‑side runtime by providing a sandboxed I/O API. Learn how to compile, run, and secure a WASI module with Wasmtime, and understand the trade‑offs for production use.
WASI lets you run WebAssembly modules with controlled file, network, and process capabilities. This note covers the minimal design, trust boundaries, operational checks, and failure modes for a secure sandboxed setup.
Goal: Configure a repeatable WASI host environment for a Wasmtime development container that exposes a fixed set of preopened directories and environment variables to a WASM module. WASI snapshot_01 standardizes file descriptors through preopened directories but does not standardize TCP/UDP sockets, so outbound network access depends on runtime-specific exte
To reduce compute costs for low-traffic workloads, adopting a scale-to-zero WebAssembly (Wasm) architecture is often more efficient than maintaining always-on containers. The fast instantiation of Wasm modules allows for per-request billing models that eliminate costs during idle periods. However, the transition depends on whether the workload's system depen
Goal Establish a hermetic, reproducible WebAssembly build pipeline for server-side and edge workloads that survives toolchain upgrades and runtime migrations. Constraints WASI preview1 (wasi_snapshot_preview1) remains the de facto stable target across Rust (wasm32-wasi), C/C++ (wasi-sdk), Go, and TinyGo. Preview2 / WASI 0.2, built on the Component Model with
wasm
rust