IT OPS

Vercel vs Cloudflare DNS Drift Reconciler

Compares the DNS targets Vercel expects for each configured domain against the live records in Cloudflare and alerts when an A, CNAME, or apex record has drifted out of alignment.

CategoryIT Ops
Enginesim
Difficultyadvanced
Triggerschedule
Steps6
Setup~25 min

How it runs

The automated pipeline, trigger to output.

  • TriggerTwice-daily schedule
  • ActionFetch expected DNS config from VercelVercelVercel
  • ActionRead live records from Cloudflare zoneCloudflareCloudflare
  • LogicDiff expected vs actual records
  • ActionLog drift event to AxiomAxiom
  • OutputSend Slack report of drifted recordsSlack

What it does

This workflow reconciles intent versus reality for your DNS. It reads each Vercel domain's required verification and routing records, queries the matching zone in Cloudflare for the live record values, and flags any mismatch — a CNAME pointing at the wrong target, a missing apex A record, or a stale value left behind after a migration.

When to use it

Use it when domains are managed in Cloudflare but served by Vercel and the two can quietly diverge. DNS drift is the most common root cause of failed certificate renewal and intermittent 404s, and it rarely throws an error until traffic breaks.

How it works

A twice-daily schedule starts the run. One action fetches each domain's expected configuration from Vercel; a second action reads the live records from the corresponding Cloudflare zone. A logic step diffs expected against actual, normalizing for trailing dots and proxied flags. When drift is found, an action writes a structured event to Axiom for trend analysis, and an output sends a Slack message listing each drifted record with both the expected and observed value so the fix is unambiguous.

Set it up

What you configure once, before turning it on.

  1. 1
    Connect VercelDeploys, runtime logs, analytics.
  2. 2
    Connect CloudflareWorkers, Pages, R2, KV — the edge stack.
  3. 3
    Connect AxiomLog streams, queries, dashboards.
  4. 4
    Connect SlackChannels, DMs, threads, mentions.
  5. 5
    Set each agent's modelWe leave models unset so you pick the tier — fast + cheap, or top-quality.
  6. 6
    Tune it to your dataEdit the prompts, filters, and field mappings so it matches how your team works.
  7. 7
    Test, then turn it onRun once against a sample, confirm the output, then enable the trigger.

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