> For the complete documentation index, see [llms.txt](https://hezhiqiang.gitbook.io/docker/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hezhiqiang.gitbook.io/docker/etcd/install.md).

# 安装

`etcd` 基于 `Go` 语言实现，因此，用户可以从 [项目主页](https://github.com/etcd-io/etcd) 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。

> 注意：本章节内容基于 etcd `3.4.x` 版本

## 二进制文件方式下载

编译好的二进制文件都在 [github.com/etcd-io/etcd/releases](https://github.com/etcd-io/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，使用 `curl` 工具下载压缩包，并解压。

```bash
$ curl -L https://github.com/etcd-io/etcd/releases/download/v3.4.0/etcd-v3.4.0-linux-amd64.tar.gz -o etcd-v3.4.0-linux-amd64.tar.gz
$ tar xzvf etcd-v3.4.0-linux-amd64.tar.gz
$ cd etcd-v3.4.0-linux-amd64
```

解压后，可以看到文件包括

```bash
$ ls
Documentation README-etcdctl.md README.md READMEv2-etcdctl.md etcd etcdctl
```

其中 `etcd` 是服务主文件，`etcdctl` 是提供给用户的命令客户端，其他文件是支持文档。

下面将 `etcd` `etcdctl` 文件放到系统可执行目录（例如 `/usr/local/bin/`）。

```bash
$ sudo cp etcd* /usr/local/bin/
```

默认 `2379` 端口处理客户端的请求，`2380` 端口用于集群各成员间的通信。启动 `etcd` 显示类似如下的信息：

```bash
$ etcd
...
2017-12-03 11:18:34.411579 I | embed: listening for peers on http://localhost:2380
2017-12-03 11:18:34.411938 I | embed: listening for client requests on localhost:2379
```

此时，可以使用 `etcdctl` 命令进行测试，设置和获取键值 `testkey: "hello world"`，检查 `etcd` 服务是否启动成功：

```bash
$ ETCDCTL_API=3 etcdctl member list
8e9e05c52164694d, started, default, http://localhost:2380, http://localhost:2379

$ ETCDCTL_API=3 etcdctl put testkey "hello world"
OK

$ etcdctl get testkey
testkey
hello world
```

说明 etcd 服务已经成功启动了。

## Docker 镜像方式运行

镜像名称为 `quay.io/coreos/etcd`，可以通过下面的命令启动 `etcd` 服务监听到 `2379` 和 `2380` 端口。

```bash
$ docker run \
-p 2379:2379 \
-p 2380:2380 \
--mount type=bind,source=/tmp/etcd-data.tmp,destination=/etcd-data \
--name etcd-gcr-v3.4.0 \
quay.io/coreos/etcd:v3.4.0 \
/usr/local/bin/etcd \
--name s1 \
--data-dir /etcd-data \
--listen-client-urls http://0.0.0.0:2379 \
--advertise-client-urls http://0.0.0.0:2379 \
--listen-peer-urls http://0.0.0.0:2380 \
--initial-advertise-peer-urls http://0.0.0.0:2380 \
--initial-cluster s1=http://0.0.0.0:2380 \
--initial-cluster-token tkn \
--initial-cluster-state new \
--log-level info \
--logger zap \
--log-outputs stderr
```

打开新的终端按照上一步的方法测试 `etcd` 是否成功启动。

## macOS 中运行

```bash
$ brew install etcd

$ etcd

$ etcdctl member list
```


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