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DNSmigrator

Selectel DNS Hosting ClouDNS

Migrate DNS from Selectel to ClouDNS.

11 record types move as they are. 1 things work differently at ClouDNS, and the preview shows exactly which of your records they affect.

Free preview. Read-only. Nothing changes until you apply.

Selectel to ClouDNS DNS migration differences

Generated from the same provider capability data the migration engine uses.

Moves as-is

  • A
  • AAAA
  • CNAME
  • MX
  • TXT
  • NS
  • SRV
  • CAA
  • ALIAS
  • DNAME
  • SSHFP

A typical Selectel zone at ClouDNS

Example records for example.com. Open any flagged row to read why it changed.

Selectel ClouDNS

  • ExactA@

    192.0.2.70

  • ExactAAAA@

    2001:db8::70

  • ExactMX@

    10 mx1.mail.example.net. +1

  • ExactTXT@

    "v=spf1 include:_spf.example.net -all"

  • ExactCAA@

    0 issue "letsencrypt.org"

  • ExactTXT_dmarc

    "v=DMARC1; p=reject; rua=mailto:dmarc@example.com"

  • ExactSRV_sip._tls

    100 1 443 sip.example.net.

  • ExactCNAMEwww

    example.com.

Set up the connections

Use the provider-specific credential guides before you preview, then keep the migration checklist beside the cutover plan.

How the move works

  1. 1

    Connect Selectel

    Connect Selectel with read-only access (Service user (username + password) with a project-scoped IAM token).

  2. 2

    Connect ClouDNS

    Connect ClouDNS (API user auth ID (or sub-user ID/name) + password). Write access is only used when you apply.

  3. 3

    Review the preview

    Check every record marked Review or Unsupported. Each one explains what changes and why.

  4. 4

    Apply to ClouDNS

    We snapshot the ClouDNS zone, write in batches, and leave Selectel untouched.

  5. 5

    Verify

    We query ClouDNS's own nameservers for every record and compare the answers before you switch.

  6. 6

    Switch nameservers

    Lower TTLs a day or two ahead, remove any DS record if DNSSEC is on, then point the domain at the new nameservers at your registrar.

Good to know about Selectel

  • Only DNS Hosting (actual) zones are supported. Zones still on DNS Hosting (legacy, API v1) must be moved to the actual version in the control panel first.
  • Zones belong to a project; this connection only sees the project it signs in to.
  • Apex NS and SOA records are created and managed by Selectel and can't be changed.
  • A CNAME can't be placed at the zone apex; use ALIAS instead.
  • Each record set can hold at most 100 values.
  • Records you disabled in Selectel are left untouched and aren't imported.
  • Selectel doesn't publish API rate limits; requests are retried with backoff when throttled.

Access we need: Create a service user with the member role scoped to only the project that holds your zones. The reader role on that project is enough for read-only exports.

Good to know about ClouDNS

  • TTLs must be one of ClouDNS's fixed values (60, 300, 900, 1800, 3600, 21600 … 2592000); other TTLs are rounded up.
  • Web redirects (CLOUDNS_WR) are ClouDNS-only and are written as plain 301 redirects without frame options.
  • The API is rate limited to about 20 requests per second per IP, so large zones apply record by record and take a while.

Access we need: A read-only API sub-user with the zones delegated is enough for the preview; applying needs a read-and-write sub-user or a main API user.

Questions

Will there be downtime moving from Selectel to ClouDNS?

Not if both providers serve the same answers during the switch. The records are copied to ClouDNS and verified before you change nameservers, so resolvers get the same answer from either side while caches expire.

Do I have to delete anything at Selectel?

No. We never write to Selectel. Keep the old zone for a week after cutover so you can switch back instantly if anything looks wrong.

What about DNSSEC?

If DNSSEC is on, remove the DS record at your registrar and wait for it to expire before switching nameservers. Then enable DNSSEC at ClouDNS and publish its new DS record. The cutover plan walks you through each step.

Related migrations

Ready to see your own zone?

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