etcd 基于 Go 语言实现，因此，用户可以从 项目主页 下载源代码自行编译，也可以下载编译好的二进制文件，甚至直接使用制作好的 Docker 镜像文件来体验。
编译好的二进制文件都在 github.com/coreos/etcd/releases 页面，用户可以选择需要的版本，或通过下载工具下载。
例如，下面的命令使用 curl 工具下载压缩包，并解压。
| curl -L https://github.com/coreos/etcd/releases/download/v2.0.0-rc.1/etcd-v2.0.0-rc.1-linux-amd64.tar.gz -o etcd-v2.0.0-rc.1-linux-amd64.tar.gz |
| tar xzvf etcd-v2.0.0-rc.1-linux-amd64.tar.gz |
| cd etcd-v2.0.0-rc.1-linux-amd64 |
| $ ls |
| etcd etcdctl etcd-migrate README-etcdctl.md README.md |
推荐通过下面的命令将三个文件都放到系统可执行目录 /usr/local/bin/ 或 /usr/bin/。
| $ sudo cp etcd* /usr/local/bin/ |
| $ ./etcd |
| 2014/12/31 14:52:09 no data-dir provided, using default data-dir ./default.etcd |
| 2014/12/31 14:52:09 etcd: listening for peers on http://localhost:2380 |
| 2014/12/31 14:52:09 etcd: listening for peers on http://localhost:7001 |
| 2014/12/31 14:52:09 etcd: listening for client requests on http://localhost:2379 |
| 2014/12/31 14:52:09 etcd: listening for client requests on http://localhost:4001 |
| 2014/12/31 14:52:09 etcdserver: name = default |
| 2014/12/31 14:52:09 etcdserver: data dir = default.etcd |
| 2014/12/31 14:52:09 etcdserver: snapshot count = 10000 |
| 2014/12/31 14:52:09 etcdserver: advertise client URLs = http://localhost:2379,http://localhost:4001 |
| 2014/12/31 14:52:09 etcdserver: initial advertise peer URLs = http://localhost:2380,http://localhost:7001 |
| 2014/12/31 14:52:09 etcdserver: initial cluster = default=http://localhost:2380,default=http://localhost:7001 |
| 2014/12/31 14:52:10 etcdserver: start member ce2a822cea30bfca in cluster 7e27652122e8b2ae |
| 2014/12/31 14:52:10 raft: ce2a822cea30bfca became follower at term 0 |
| 2014/12/31 14:52:10 raft: newRaft ce2a822cea30bfca [peers: [], term: 0, commit: 0, lastindex: 0, lastterm: 0] |
| 2014/12/31 14:52:10 raft: ce2a822cea30bfca became follower at term 1 |
| 2014/12/31 14:52:10 etcdserver: added local member ce2a822cea30bfca [http://localhost:2380 http://localhost:7001] to cluster 7e27652122e8b2ae |
| 2014/12/31 14:52:11 raft: ce2a822cea30bfca is starting a new election at term 1 |
| 2014/12/31 14:52:11 raft: ce2a822cea30bfca became candidate at term 2 |
| 2014/12/31 14:52:11 raft: ce2a822cea30bfca received vote from ce2a822cea30bfca at term 2 |
| 2014/12/31 14:52:11 raft: ce2a822cea30bfca became leader at term 2 |
| 2014/12/31 14:52:11 raft.node: ce2a822cea30bfca elected leader ce2a822cea30bfca at term 2 |
| 2014/12/31 14:52:11 etcdserver: published {Name:default ClientURLs:[http://localhost:2379 http://localhost:4001]} to cluster 7e27652122e8b2ae |
testkey: "hello world"，检查 etcd 服务是否启动成功：
| $ ./etcdctl set testkey "hello world" |
| hello world |
| $ ./etcdctl get testkey |
| hello world |
当然，也可以通过 HTTP 访问本地 2379 或 4001 端口的方式来进行操作，例如查看 testkey 的值：
| $ curl -L http://localhost:4001/v2/keys/testkey |
| {"action":"get","node":{"key":"/testkey","value":"hello world","modifiedIndex":3,"createdIndex":3}} |
镜像名称为 quay.io/coreos/etcd:v2.0.0_rc.1，可以通过下面的命令启动 etcd 服务监听到 4001 端口。
| $ sudo docker run -p 4001:4001 -v /etc/ssl/certs/:/etc/ssl/certs/ quay.io/coreos/etcd:v2.0.0_rc.1 |
