CoreDNS-1.2.3 Release

CoreDNS-1.2.3 Release Notes.

We are pleased to announce the release of CoreDNS-1.2.3!


This is a big release that spans almost 6 weeks of development, slightly longer than normal. You may also have noticed that CoreDNS wasn’t made the default in Kubernetes 1.12 due to increased memory used compared to kube-dns. This release contains a fix for that.

The underlying DNS library has seen multiple updates to improve throughput and memory and we have enabled REUSE_PORT on the ports CoreDNS opens on *nix.


  • federation return a correct answer (SERVFAIL) if availability-zone or region labels are missing from a node.
  • route53
    • Refactor add-on to support batch querying of Route 53 along with all AWS record types (including CNAME).
    • Add support for zones with overlapping domains (split config)
    • Minor improvements (fallthrough, upstream options, AWS credentials file support)
  • cache add a minttl option to set the minimal TTL for records being cached. The cache key moved to hash/fnv64.
  • rewrite can now also rewrite TTLs
  • kubernetes
    • Uses less memory (~30% less).
    • Do not block on startup when connecting to the API server; returns SERVFAIL in the mean time.
    • Support for using a kubeconfig file, including various auth providers (Azure not supported due to a compilation issue with that code).
  • reload allows the reload interval to be configured.
  • forward fix a crash when health checking is enabled in some circumstances.

Brought to you by:

Aaron Riekenberg, Billie Cleek, Brad Beam, Can Yucel, Chris O’Haver, dilyevsky, Eugen Kleiner, Francois Tur, John Belamaric, Manuel Alejandro de Brito Fontes, Manuel Stocker, marqc, Miek Gieben, Nic Cope, Paul G, Ruslan Drozhdzh, Tom Thorogood, Yong Tang, Zach Eddy.

For documentation see our (in progress!) manual. For help and other resources, see our community page.

CoreDNS Authors
Published: and tagged 1.2.3, Notes and Release using 282 words.