# etcd

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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.

![etcd Logo](logos/etcd-horizontal-color.svg)

etcd is a distributed reliable key-value store for the most critical data of a distributed system, with a focus on being:

* *Simple*: well-defined, user-facing API (gRPC)
* *Secure*: automatic TLS with optional client cert authentication
* *Fast*: benchmarked 10,000 writes/sec
* *Reliable*: properly distributed using Raft

etcd is written in Go and uses the [Raft][raft] consensus algorithm to manage a highly-available replicated log.

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], [locksmith][locksmith], [vulcand][vulcand], [Doorman][doorman], and many others. Reliability is further ensured by [**rigorous testing**](https://github.com/etcd-io/etcd/tree/master/functional).

See [etcdctl][etcdctl] for a simple command line client.

[raft]: https://raft.github.io/
[k8s]: http://kubernetes.io/
[doorman]: https://github.com/youtube/doorman
[locksmith]: https://github.com/coreos/locksmith
[vulcand]: https://github.com/vulcand/vulcand
[etcdctl]: https://github.com/etcd-io/etcd/tree/master/etcdctl

## Community meetings

*Community meeting will resume at 11:00 am on Thursday, January 10th, 2019.*

etcd contributors and maintainers have monthly (every four weeks) meetings at 11:00 AM (USA Pacific) on Thursday.

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.

[shared-meeting-notes]: https://docs.google.com/document/d/16XEGyPBisZvmmoIHSZzv__LoyOeluC5a4x353CX0SIM/edit

Please download and import the following iCalendar (.ics) files to calendar system.

Weekly: https://zoom.us/meeting/916003437/ics?icsToken=e4a085b6837f5802d9aef0d2ded4777d0faf1a71e39279c4a6d8b577993d879c

Join Zoom Meeting https://zoom.us/j/916003437

```
One tap mobile
+14086380986,,916003437# US (San Jose)
+16465588665,,916003437# US (New York)

Dial by location
        +1 408 638 0986 US (San Jose)
        +1 646 558 8665 US (New York)

Meeting ID: 916 003 437
```

To Find local number: https://zoom.us/u/actX55uPfS

## Getting started

### Getting etcd

The easiest way to get etcd is to use one of the pre-built release binaries which are available for OSX, Linux, Windows, and Docker on the [release page][github-release].

For more installation guides, please check out [play.etcd.io](http://play.etcd.io) and [operating etcd](https://github.com/etcd-io/etcd/tree/master/Documentation#operating-etcd-clusters).

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 1.12+ 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.

[github-release]: https://github.com/etcd-io/etcd/releases
[branch-management]: ./Documentation/branch_management.md
[dl-build]: ./Documentation/dl_build.md#build-the-latest-version

### Running etcd

First start a single-member cluster of etcd.

If etcd is installed using the [pre-built release binaries][github-release], run it from the installation location as below:

```bash
/tmp/etcd-download-test/etcd
```

The etcd command can be simply run as such if it is moved to the system path as below:

```bash
mv /tmp/etcd-download-test/etcd /usr/local/bin/
etcd
```

If etcd is [built from the master branch][dl-build], run it as below:

```bash
./bin/etcd
```

This will bring up etcd listening on port 2379 for client communication and on port 2380 for server-to-server communication.

Next, let's set a single key, and then retrieve it:

```
etcdctl put mykey "this is awesome"
etcdctl get mykey
```

etcd is now running and serving client requests. For more, please check out:

- [Interactive etcd playground](http://play.etcd.io)
- [Animated quick demo](./Documentation/demo.md)

### etcd TCP ports

The [official etcd ports][iana-ports] are 2379 for client requests, and 2380 for peer communication.

[iana-ports]: http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt

### Running a local etcd cluster

First install [goreman](https://github.com/mattn/goreman), which manages Procfile-based applications.

Our [Procfile script](./Procfile) will set up a local example cluster. Start it with:

```bash
goreman start
```

This will bring up 3 etcd members `infra1`, `infra2` and `infra3` and etcd `grpc-proxy`, which runs locally and composes a cluster.

Every cluster member and proxy accepts key value reads and key value writes.

### Next steps

Now it's time to dig into the full etcd API and other guides.

- Read the full [documentation][fulldoc].
- Explore the full gRPC [API][api].
- Set up a [multi-machine cluster][clustering].
- Learn the [config format, env variables and flags][configuration].
- Find [language bindings and tools][integrations].
- Use TLS to [secure an etcd cluster][security].
- [Tune etcd][tuning].

[fulldoc]: ./Documentation/docs.md
[api]: ./Documentation/dev-guide/api_reference_v3.md
[clustering]: ./Documentation/op-guide/clustering.md
[configuration]: ./Documentation/op-guide/configuration.md
[integrations]: ./Documentation/integrations.md
[security]: ./Documentation/op-guide/security.md
[tuning]: ./Documentation/tuning.md

## Contact

- Mailing list: [etcd-dev](https://groups.google.com/forum/?hl=en#!forum/etcd-dev)
- IRC: #[etcd](irc://irc.freenode.org:6667/#etcd) on freenode.org
- Planning/Roadmap: [milestones](https://github.com/etcd-io/etcd/milestones), [roadmap](./ROADMAP.md)
- Bugs: [issues](https://github.com/etcd-io/etcd/issues)

## Contributing

See [CONTRIBUTING](CONTRIBUTING.md) for details on submitting patches and the contribution workflow.

## Reporting bugs

See [reporting bugs](Documentation/reporting_bugs.md) for details about reporting any issues.

## Reporting a security vulnerability

A security vulnerability can be reported as an issue, however, GitHub and mailing lists may NOT always be an appropriate place for reporting vulnerabilities. In that case, please reach out to the project [MAINTAINERS](https://github.com/etcd-io/etcd/blob/master/MAINTAINERS) to first discuss the vulnerabilities with them and take necessary action per such discussion.

## Issue and PR management

See [issue triage guidelines](Documentation/triage/issues.md) for details on how issues are managed.

See [PR management](Documentation/triage/PRs.md) for guidelines on how pull requests are managed.

## etcd Emeritus Maintainers

These emeritus maintainers dedicated a part of their career to etcd and reviewed code, triaged bugs, and pushed the project forward over a substantial period of time. Their contribution is greatly appreciated.

* Fanmin Shi
* Anthony Romano

### License

etcd is under the Apache 2.0 license. See the [LICENSE](LICENSE) file for details.