Workflow: a safe Workers CI/CD pipeline
# Workflow: Workers CI/CD pipeline
## 1. Environments
Define `[env.staging]` and `[env.production]` in the Wrangler file, each with its own bindings (separate D1 databases, KV namespaces, R2 buckets, queues). Never share a production database binding with staging.
## 2. Secrets per environment
Set secrets with `wrangler secret put --env staging` / `--env production`. Declare required secret names in the config's `secrets` property so a deploy fails loudly when a secret is missing instead of the Worker failing at runtime. Remember: `wrangler secret put` deploys immediately; treat secret rotation as a deploy and verify it.
## 3. Preview URLs for PRs
Deploy PR branches to preview URLs (workers.dev or version URLs) and run integration tests against them: bindings wired, routes responding, scheduled handlers registered.
## 4. Staged rollout
Deploy to staging, run smoke tests (health endpoint, a write-and-read through each binding, a cron trigger dry run), then deploy to production. Keep the previous production version restorable: Wrangler keeps version history, and a rollback is a redeploy of the known-good version.
## 5. Post-deploy verification
Tail production logs during the deploy. Check error classes: a fresh 1101 is a code bug, a fresh 1102 is a CPU-limit problem. Verify `CF-Cache-Status` behavior if the Worker sits behind cache rules.
## Checklist
- Separate bindings per environment, no exceptions for databases.
- Required secrets declared; rotation treated as a deploy.
- Smoke tests hit every binding, not just the HTTP surface.Maintainer review
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