docker_practice/etcd/install.md
Ma Huihuang 1fdb8da844
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2018-09-14 16:42:45 +08:00

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## 安装
`etcd` 基于 `Go` 语言实现因此用户可以从 [项目主页](https://github.com/coreos/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.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/coreos/etcd/releases](https://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。
例如使用 `curl` 工具下载压缩包并解压
```bash
$ curl -L https://github.com/coreos/etcd/releases/download/v3.2.10/etcd-v3.2.10-linux-amd64.tar.gz -o etcd-v3.2.10-linux-amd64.tar.gz
$ tar xzvf etcd-v3.2.10-linux-amd64.tar.gz
$ cd etcd-v3.2.10-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 11:18:34.406082 I | etcdmain: etcd Version: 3.2.10
2017-12-03 11:18:34.406226 I | etcdmain: Git SHA: GitNotFound
2017-12-03 11:18:34.406235 I | etcdmain: Go Version: go1.9.2
2017-12-03 11:18:34.406242 I | etcdmain: Go OS/Arch: darwin/amd64
2017-12-03 11:18:34.406250 I | etcdmain: setting maximum number of CPUs to 4, total number of available CPUs is 4
2017-12-03 11:18:34.406265 N | etcdmain: failed to detect default host (default host not supported on darwin_amd64)
2017-12-03 11:18:34.406279 W | etcdmain: no data-dir provided, using default data-dir ./default.etcd
2017-12-03 11:18:34.406457 N | etcdmain: the server is already initialized as member before, starting as etcd member...
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` `2380` 端口
```bash
$ export NODE1=192.168.1.21
$ docker run --name etcd \
-p 2379:2379 \
-p 2380:2380 \
--volume=etcd-data:/etcd-data \
quay.io/coreos/etcd:latest \
/usr/local/bin/etcd \
--data-dir=/etcd-data --name node1 \
--initial-advertise-peer-urls http://${NODE1}:2380 --listen-peer-urls http://0.0.0.0:2380 \
--advertise-client-urls http://${NODE1}:2379 --listen-client-urls http://0.0.0.0:2379 \
--initial-cluster node1=http://${NODE1}:2380
```
>注意etcd 官方标注 `quay.io/coreos/etcd` 即将废弃启用新的 `gcr.io/etcd-development/etcd` 镜像但后者由于网络原因国内不能下载到该镜像这里仍然使用前者作为演示
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
```