Multi-CDN explained: when a second CDN is worth it

Multi-CDN is an architecture, not a default. Get one Cloud CDN distribution correct, then add a second path if you have a real failure domain to cover.

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Two CDNs with broken purge and an open origin is worse than one CDN you operate. Multi-CDN is for teams that already have a working edge and a specific second-path requirement.

Do the first CDN properly

Origin restriction, purge in CI, TLS, bypass rules and a rehearsal hostname. If that is not true, a second vendor duplicates confusion.

What a second path is for

Vendor failure domains, regional coverage gaps, or contractual dual-source. DNS (Cloud DNS weights or failover) is how clients choose a path.

Origin must allow every puller

Firewall rules that only allow one CDN will turn the second CDN into an outage. Token and logging stories multiply too.

Aptranet as one of the paths

Cloud CDN can be the only CDN or one path in a multi-CDN design. Origin Shield still helps on the Aptranet miss path.

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Frequently Asked Questions

Should a startup start with two CDNs?

Usually no. Get one distribution correct first.

Is DNS the switch?

Often yes: weights, geo or failover between CDN hostnames. Low TTL makes the switch usable.

Does multi-CDN fix a slow origin?

No. Both CDNs will miss to the same slow origin unless you also cache and shield.