One server in Amsterdam, want failover to Frankfurt
DNS failover swaps records when a healthcheck fails. Not real-time HA, but good for minutes-of-downtime.
Try this first
- 1Lower TTL to 60-120 on the A record being failed over
- 2Configure healthcheck (HTTP, TCP) at a DNS host with failover support (Route53, NS1, Cloudflare paid)
- 3Set primary plus secondary IP with failover policy
- 4Test by deliberately killing primary, log the switchover time
When to bring us in
For sub-second failover, use anycast plus a load balancer, not DNS.
See also
- Domain expires tomorrow and nobody saw the emailAn expired domain doesn't transfer instantly. There's a redemption window, but you pay extra.
- Unsure whether to enable auto-renewDisabling auto-renew only makes sense for domains you'll truly drop. For anything live, just keep it on.
- New registrar asks for auth code, can't find itEPP code or transfer code is the password to move a domain from registrar A to B.
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