Xiang Li 2013-07-23 11:38:50 -07:00
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# etcd
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][raft] paxos implementation for high availability.
See [go-etcd][go-etcd] for a native go client. Or feel free to just use curl, as in the examples below.
[raft]: https://github.com/coreos/go-raft
[go-etcd]: https://github.com/coreos/go-etcd
## Getting Started
### Building
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{"action":"DELETE","key":"/message","prevValue":"Hello etcd","index":5}
```
#### Using time to live key
#### Using a TTL on a key
Keys in etcd can be set to expire after a specified number of seconds. That is done by setting a TTL (time to live) on the key when you POST:
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curl http://127.0.0.1:4001/v1/keys/foo
```
If the TTL has passed then you will
If the TTL has expired, the key will be deleted, and you will be returned a 404.
```html
404 page not found