76 lines
4.1 KiB
Markdown
76 lines
4.1 KiB
Markdown
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title = "CoreDNS-1.0.0 Release"
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description = "CoreDNS-1.0.0 Release Notes."
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tags = ["Release", "1.0.0", "Notes"]
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draft = false
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release = "1.0.0"
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date = "2017-12-01T22:43:43-00:00"
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author = "coredns"
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We are pleased to announce the [release](https://github.com/coredns/coredns/releases/tag/v1.0.0) of CoreDNS-1.0.0!
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Release 1.0.0 and other recent releases have focused on improving the performance and
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functionality of the *kubernetes* plugin, since CoreDNS is now on track to eventually
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[replace kube-dns](https://github.com/kubernetes/features/issues/427) as the default
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cluster DNS in Kubernetes.
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As part of the [Kubernetes proposal](https://github.com/kubernetes/community/pull/1100), we have shown that CoreDNS
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not only provides more functionality than kube-dns, but performs much better while using less memory. In our tests,
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[CoreDNS](https://github.com/kubernetes/community/pull/1100#issuecomment-337747482) running against a cluster with 5000
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services was able to process 18,000 queries per second using 73MB of RAM, while
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[kube-dns](https://github.com/kubernetes/community/pull/1100#issuecomment-338329100) achieved 7,000qps using 97MB of RAM.
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This can be partial ascribed to CoreDNS simpler runtime - a single process instead of a combination of several processes.
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CoreDNS also implements a number of Kubernetes-related features that are not part of kube-dns, including:
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* Filtering of records by namespace
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* Filtering of records by label selector
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* `pods verified` mode, which ensures that a Pod exists before returning an answer for a `pod.cluster.local` query
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* `endpoint_pod_names` which uses [Pod names](https://github.com/kubernetes/kubernetes/issues/47992) for service endpoint records if the hostname is not set
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* `autopath` which provides a server-side implementation of the namespace-specific search path. This can cut down the query latency from pods dramatically.
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As a general-purpose DNS server, CoreDNS also enables many other use cases that would be difficult or impossible to
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achieve with kube-dns, such as the ability to create [custom DNS entries](https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/).
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We are excited to continue our contributions to the Kubernetes community, and CoreDNS is being incorporated as a 1.9 alpha feature into a variety
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of Kubernetes deployment mechanisms, including upcoming versions of [kubeadm](https://github.com/kubernetes/kubeadm), [kops](https://github.com/kubernetes/kops), [minikube](https://github.com/kubernetes/minikube), and [kubespray](https://github.com/kubernetes-incubator/kubespray).
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Of course, there is more to 1.0.0 than just the Kubernetes work. See below for the details on all the changes.
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## Core
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* Fixed a bug in the gRPC server that prevented *dnstap* from working with it.
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* Additional fuzz testing to ferret out obscure bugs.
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* Documentation and configuration cleanups.
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## Plugins
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* *log* no longer accepts `stdout` in the configuration (use of a file was removed in a previous release). All logging is always to STDOUT. This is a backwards **incompatible** change, so be sure to check your Corefile for this.
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* *health* now checks plugins that support it for health and reflects that in the server health.
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* *kubernetes* now shows healthy only after the initial API sync is complete.
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* *kubernetes* has bug fixes and performance improvements.
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* *kubernetes* now has an option to use pod names instead of IPs in service endpoint records when the `hostname` is not set.
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* *metrics* have been revised to provide better histograms. You will need to change your Prometheus queries as metric names have changed to comply with Prometheus best practices.
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* *erratic* now supports the health check.
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## Contributors
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The following people helped with getting this release done:
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Andy Goldstein,
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Ben Kochie,
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Brian Akins,
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Chris O'Haver,
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Christian Nilsson,
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John Belamaric,
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Max Schmitt,
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Michael Grosser,
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Miek Gieben,
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Ruslan Drozhdzh,
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Uladzimir Trehubenka,
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Yong Tang.
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If you want to help, please check out one of the [issues](https://github.com/coredns/coredns/issues/)
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and start coding!
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For documentation and help, see our [community page](https://coredns.io/community/).
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