etcd

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Published: Apr 29, 2016 License: Apache-2.0 Imports: 1 Imported by: 0

README

etcd

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Note: The master branch may be in an unstable or even broken state during development. Please use releases instead of the master branch in order to get stable binaries.

etcd Logo

etcd is a distributed, consistent key-value store for shared configuration and service discovery, with a focus on being:

  • Simple: curl'able user-facing API (HTTP+JSON)
  • Secure: optional SSL client cert authentication
  • Fast: benchmarked 1000s of writes/s per instance
  • Reliable: properly distributed using Raft

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

etcd is used in production by many companies, and the development team stands behind it in critical deployment scenarios, where etcd is frequently teamed with applications such as Kubernetes, fleet, locksmith, vulcand, and many others.

See etcdctl for a simple command line client. Or feel free to just use curl, as in the examples below.

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, AppC (ACI), and Docker. Instructions for using these binaries are on the GitHub releases page.

For those wanting to try the very latest version, you can build the latest version of etcd from the master branch. You will first need Go installed on your machine (version 1.4+ 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 guide.

Running etcd

First start a single-member cluster of etcd:

./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:

curl -L http://127.0.0.1:2379/v2/keys/mykey -XPUT -d value="this is awesome"
curl -L http://127.0.0.1:2379/v2/keys/mykey

You have successfully started an etcd and written a key to the store.

etcd TCP ports

The official etcd ports are 2379 for client requests, and 2380 for peer communication. To maintain compatibility, some etcd configuration and documentation continues to refer to the legacy ports 4001 and 7001, but all new etcd use and discussion should adopt the IANA-assigned ports. The legacy ports 4001 and 7001 will be fully deprecated, and support for their use removed, in future etcd releases.

Running local etcd cluster

First install goreman, which manages Procfile-based applications.

Our Procfile script will set up a local example cluster. You can start it with:

goreman start

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

You can write a key to the cluster and retrieve the value back from any member or proxy.

Next Steps

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

Contact

Contributing

See CONTRIBUTING for details on submitting patches and the contribution workflow.

Reporting bugs

See reporting bugs for details about reporting any issue you may encounter.

Project Details

Versioning
Service Versioning

etcd uses semantic versioning New minor versions may add additional features to the API.

You can get the version of etcd by issuing a request to /version:

curl -L http://127.0.0.1:2379/version
API Versioning

The v2 API responses should not change after the 2.0.0 release but new features will be added over time.

32-bit and other unsupported systems

etcd has known issues on 32-bit systems due to a bug in the Go runtime. See #358 for more information.

To avoid inadvertantly running a possibly unstable etcd server, etcd on unsupported architectures will print a warning message and immediately exit if the environment variable ETCD_UNSUPPORTED_ARCH is not set to the target architecture.

Currently only the amd64 architecture is officially supported by etcd.

License

etcd is under the Apache 2.0 license. See the LICENSE file for details.

Documentation

The Go Gopher

There is no documentation for this package.

Directories

Path Synopsis
Godeps
Package client provides bindings for the etcd APIs.
Package client provides bindings for the etcd APIs.
clientv3 is the official Go etcd client for v3.
clientv3 is the official Go etcd client for v3.
contrib
Package discovery provides an implementation of the cluster discovery that is used by etcd.
Package discovery provides an implementation of the cluster discovery that is used by etcd.
Package e2e implements tests built upon etcd binaries, and focus on end-to-end testing.
Package e2e implements tests built upon etcd binaries, and focus on end-to-end testing.
error package describes errors in etcd project.
error package describes errors in etcd project.
etcdctl is a command line application that controls etcd.
etcdctl is a command line application that controls etcd.
etcdctlv3 is a command line application that utilizes v3 API.
etcdctlv3 is a command line application that utilizes v3 API.
Package etcdmain contains the main entry point for the etcd binary.
Package etcdmain contains the main entry point for the etcd binary.
Package etcdserver defines how etcd servers interact and store their states.
Package etcdserver defines how etcd servers interact and store their states.
pkg
Package proxy implements etcd proxy node.
Package proxy implements etcd proxy node.
Package raft sends and receives messages in the Protocol Buffer format defined in the raftpb package.
Package raft sends and receives messages in the Protocol Buffer format defined in the raftpb package.
Package rafthttp implements HTTP transportation layer for etcd/raft pkg.
Package rafthttp implements HTTP transportation layer for etcd/raft pkg.
Package snap stores raft nodes' states with snapshots.
Package snap stores raft nodes' states with snapshots.
Package storage defines etcd's stable storage.
Package storage defines etcd's stable storage.
Package store defines etcd's in-memory key/value store.
Package store defines etcd's in-memory key/value store.
tools
Package version implements etcd version parsing and contains latest version information.
Package version implements etcd version parsing and contains latest version information.
wal
Package wal provides an implementation of a write ahead log that is used by etcd.
Package wal provides an implementation of a write ahead log that is used by etcd.

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