README version 0.4.5
- 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.
If you're considering etcd for production use, please see: production-ready.md
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
NOTE: you need go 1.2+. Please check your installation with
See the development tools documentation for alternative build methods like using Vagrant.
First start a single-machine cluster of etcd:
This will bring up etcd listening on port 4001 for client communication and on port 7001 for server-to-server communication.
Next, let's 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's time to dig into the full etcd API and other guides.
- Explore the full API.
- Set up 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.
- Upgrade from old version.
See CONTRIBUTING for details on submitting patches and the contribution workflow.
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.
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 has known issues on 32bit systems. We plan to address these issues after the 0.4 release.
etcd is under the Apache 2.0 license. See the LICENSE file for details.