mirror of https://github.com/k3s-io/k3s
162 lines
7.1 KiB
Markdown
162 lines
7.1 KiB
Markdown
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# etcd
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[](https://goreportcard.com/report/github.com/coreos/etcd)
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[](https://codecov.io/gh/coreos/etcd)
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[](https://travis-ci.org/coreos/etcd)
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[](https://semaphoreci.com/coreos/etcd)
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[](https://godoc.org/github.com/coreos/etcd)
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[](https://github.com/coreos/etcd/releases)
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[](https://github.com/coreos/etcd/blob/master/LICENSE)
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**Note**: The `master` branch may be in an *unstable or even broken state* during development. Please use [releases][github-release] instead of the `master` branch in order to get stable binaries.
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*the etcd v2 [documentation](Documentation/v2/README.md) has moved*
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etcd is a distributed reliable key-value store for the most critical data of a distributed system, with a focus on being:
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* *Simple*: well-defined, user-facing API (gRPC)
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* *Secure*: automatic TLS with optional client cert authentication
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* *Fast*: benchmarked 10,000 writes/sec
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* *Reliable*: properly distributed using Raft
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etcd is written in Go and uses the [Raft][raft] consensus algorithm to manage a highly-available replicated log.
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etcd is used [in production by many companies](./Documentation/production-users.md), and the development team stands behind it in critical deployment scenarios, where etcd is frequently teamed with applications such as [Kubernetes][k8s], [fleet][fleet], [locksmith][locksmith], [vulcand][vulcand], [Doorman][doorman], and many others. Reliability is further ensured by rigorous [testing][etcd-tests].
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See [etcdctl][etcdctl] for a simple command line client.
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[raft]: https://raft.github.io/
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[k8s]: http://kubernetes.io/
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[doorman]: https://github.com/youtube/doorman
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[fleet]: https://github.com/coreos/fleet
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[locksmith]: https://github.com/coreos/locksmith
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[vulcand]: https://github.com/vulcand/vulcand
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[etcdctl]: https://github.com/coreos/etcd/tree/master/etcdctl
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[etcd-tests]: http://dash.etcd.io
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## Community meetings
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etcd contributors and maintainers have bi-weekly meetings at 11:00 AM (USA Pacific) on Tuesdays. There is an [iCalendar][rfc5545] format for the meetings [here](meeting.ics). Anyone is welcome to join via [Zoom][zoom] or audio-only: +1 669 900 6833. An initial agenda will be posted to the [shared Google docs][shared-meeting-notes] a day before each meeting, and everyone is welcome to suggest additional topics or other agendas.
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[rfc5545]: https://tools.ietf.org/html/rfc5545
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[zoom]: https://coreos.zoom.us/j/854793406
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[shared-meeting-notes]: https://docs.google.com/document/d/1DbVXOHvd9scFsSmL2oNg4YGOHJdXqtx583DmeVWrB_M/edit#
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## Getting started
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### Getting etcd
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The easiest way to get etcd is to use one of the pre-built release binaries which are available for OSX, Linux, Windows, [rkt][rkt], and Docker. Instructions for using these binaries are on the [GitHub releases page][github-release].
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For those wanting to try the very latest version, [build the latest version of etcd][dl-build] from the `master` branch. This first needs [*Go*](https://golang.org/) installed (version 1.9+ is required). All development occurs on `master`, including new features and bug fixes. Bug fixes are first targeted at `master` and subsequently ported to release branches, as described in the [branch management][branch-management] guide.
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[rkt]: https://github.com/rkt/rkt/releases/
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[github-release]: https://github.com/coreos/etcd/releases/
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[branch-management]: ./Documentation/branch_management.md
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[dl-build]: ./Documentation/dl_build.md#build-the-latest-version
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### Running etcd
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First start a single-member cluster of etcd.
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If etcd is installed using the [pre-built release binaries][github-release], run it from the installation location as below:
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```sh
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/tmp/etcd-download-test/etcd
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```
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The etcd command can be simply run as such if it is moved to the system path as below:
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```sh
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mv /tmp/etcd-download-test/etcd /usr/locale/bin/
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etcd
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```
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If etcd is [build from the master branch][dl-build], run it as below:
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```sh
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./bin/etcd
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```
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This will bring up etcd listening on port 2379 for client communication and on port 2380 for server-to-server communication.
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Next, let's set a single key, and then retrieve it:
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```
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ETCDCTL_API=3 etcdctl put mykey "this is awesome"
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ETCDCTL_API=3 etcdctl get mykey
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```
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That's it! etcd is now running and serving client requests. For more
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- [Animated quick demo][demo-gif]
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- [Interactive etcd playground][etcd-play]
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[demo-gif]: ./Documentation/demo.md
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[etcd-play]: http://play.etcd.io/
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### etcd TCP ports
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The [official etcd ports][iana-ports] are 2379 for client requests, and 2380 for peer communication.
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[iana-ports]: http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt
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### Running a local etcd cluster
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First install [goreman](https://github.com/mattn/goreman), which manages Procfile-based applications.
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Our [Procfile script](./Procfile) will set up a local example cluster. Start it with:
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```sh
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goreman start
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```
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This will bring up 3 etcd members `infra1`, `infra2` and `infra3` and etcd `grpc-proxy`, which runs locally and composes a cluster.
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Every cluster member and proxy accepts key value reads and key value writes.
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### Running etcd on Kubernetes
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To run an etcd cluster on Kubernetes, try [etcd operator](https://github.com/coreos/etcd-operator).
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### Next steps
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Now it's time to dig into the full etcd API and other guides.
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- Read the full [documentation][fulldoc].
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- Explore the full gRPC [API][api].
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- Set up a [multi-machine cluster][clustering].
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- Learn the [config format, env variables and flags][configuration].
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- Find [language bindings and tools][integrations].
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- Use TLS to [secure an etcd cluster][security].
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- [Tune etcd][tuning].
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[fulldoc]: ./Documentation/docs.md
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[api]: ./Documentation/dev-guide/api_reference_v3.md
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[clustering]: ./Documentation/op-guide/clustering.md
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[configuration]: ./Documentation/op-guide/configuration.md
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[integrations]: ./Documentation/integrations.md
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[security]: ./Documentation/op-guide/security.md
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[tuning]: ./Documentation/tuning.md
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## Contact
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- Mailing list: [etcd-dev](https://groups.google.com/forum/?hl=en#!forum/etcd-dev)
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- IRC: #[etcd](irc://irc.freenode.org:6667/#etcd) on freenode.org
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- Planning/Roadmap: [milestones](https://github.com/coreos/etcd/milestones), [roadmap](./ROADMAP.md)
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- Bugs: [issues](https://github.com/coreos/etcd/issues)
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## Contributing
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See [CONTRIBUTING](CONTRIBUTING.md) for details on submitting patches and the contribution workflow.
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## Reporting bugs
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See [reporting bugs](Documentation/reporting_bugs.md) for details about reporting any issues.
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### License
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etcd is under the Apache 2.0 license. See the [LICENSE](LICENSE) file for details.
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