README version 0.3.0

A highly-available key value store for shared configuration and service discovery. etcd is inspired by zookeeper and doozer, with a focus on:

• 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.

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

The latest release and setup instructions are available at Github.

You can build etcd from source:

git clone https://github.com/coreos/etcd
cd etcd
./build

This will generate a binary called ./bin/etcd.

NOTE: you need go 1.2+. Please check your installation with

go version

First start a single machine cluster of etcd:

./bin/etcd

This will bring up etcd listening on port 4001 for client communication and on port 7001 for server-to-server communication.

Next lets set a single key and then retrieve it:

curl -L http://127.0.0.1:4001/v2/keys/mykey -XPUT -d value="this is awesome"
curl -L http://127.0.0.1:4001/v2/keys/mykey

You have successfully started an etcd on a single machine and written a key to the store. Now it time to dig into the full etcd API and other guides.

• Explore the full API.
• Setup a multi-machine cluster.
• Learn the config format, env variables and flags.
• Find language bindings and tools.
• Learn about the dashboard, lock and leader election modules.
• Use TLS to secure an etcd cluster.
• Tune etcd.

• Mailing list: http://coreos.com/lists/etcd-dev/
• IRC: #coreos on irc.freenode.net
• Planning/Roadmap: https://trello.com/b/OiEbU547/etcd
• Bugs: https://github.com/coreos/etcd/issues

See CONTRIBUTING for details on submitting patches and contacting developers via IRC and mailing lists.

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://127.0.0.1:4001/version

Clients are encouraged to use the v2 API. The v1 API will not change.

The v2 API responses should not change after the 0.2.0 release but new features will be added over time.

During the pre-v1.0.0 series of releases we may break the API as we fix bugs and get feedback.

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