denoland/celld

Self-hosted, distributed Durable Objects.

celld is an open-source daemon that runs Cloudflare Workers and Durable Objects on your own machines. Each object is its own SQLite database, addressed by name and replicated to an S3-compatible bucket you own; nodes coordinate through that bucket alone, with no control plane or consensus. Because every object is its own small database, applications shard by construction — the contention and blast-radius failures of one shared database are designed out, not managed. Idle cells hibernate to nearly nothing. Learn more at celld.dev or read the documentation.

Every celld node embeds V8 and executes Wrangler bundles. The fleet shares an S3-compatible bucket containing deployments, cell state, and small ownership records. Object-storage compare-and-swap ensures that exactly one node owns a cell at a time, without a membership protocol, failure detector, or consensus service.

celld continuously replicates each cell's SQLite database to the bucket. When a cell moves or wakes up, its new owner restores that database and resumes execution. The bucket is the durable source of truth; nodes are replaceable.

The installer downloads the celld binary (provenance is verifiable with gh attestation verify):

Put ~/.local/bin on your PATH if the installer asks you to.

Worker projects deployed with celld deploy need esbuild on PATH; asset-only projects do not.