安装运行本地etcd

一个集群中etcd服务的运行数量必须是奇数才能保证稳定。在开发测试环境，可以本地运行一个单一节点单服务 etcd或者一个单机节点etcd集群用于验证功能。

备注

本文实践是开发测试环境单机运行，服务监听 127.0.0.1 端口，所以没有任何安全加密认证，仅供测试。

Linux/macOS安装etcd

备注

下载安装脚本适配 x86 和 ARM 的Linux，以及x86的 macOS

etcd-io / etcd Releases 提供了最新版本，当前 3.5.2 :

下载etcd的linux版本脚本 install_etcd.sh

ETCD_VER=v3.5.4
KERNEL=`uname -s` # Linux / Darwin
ARCH=`uname -m` # x86_64 / aarch64

if [ ${KERNEL} == "Linux" ];then
    KERNEL="linux"
elif [ ${KERNEL} == "Darwin" ];then
    KERNEL="darwin"
else
    echo "Not Linux or macOS, exit!"
    exit 0
fi

if [ ${ARCH} == "x86_64" ];then
    ARCH="amd64"
elif [ ${ARCH} == "aarch64"  ];then
    ARCH="arm64"
else
    echo "Not x86_64 or aarch64, exit!"
    exit 0
fi

# choose either URL
GOOGLE_URL=https://storage.googleapis.com/etcd
GITHUB_URL=https://github.com/etcd-io/etcd/releases/download
DOWNLOAD_URL=${GOOGLE_URL}

rm -f /tmp/etcd-${ETCD_VER}-${KERNEL}-${ARCH}.tar.gz
rm -rf /tmp/etcd-download-test && mkdir -p /tmp/etcd-download-test

curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-${KERNEL}-${ARCH}.tar.gz -o /tmp/etcd-${ETCD_VER}-${KERNEL}-${ARCH}.tar.gz
tar xzvf /tmp/etcd-${ETCD_VER}-${KERNEL}-${ARCH}.tar.gz -C /tmp/etcd-download-test --strip-components=1
rm -f /tmp/etcd-${ETCD_VER}-${KERNEL}-${ARCH}.tar.gz

/tmp/etcd-download-test/etcd --version
/tmp/etcd-download-test/etcdctl version
/tmp/etcd-download-test/etcdutl version

sudo mv /tmp/etcd-download-test/etcd /usr/local/bin
sudo mv /tmp/etcd-download-test/etcdctl /usr/local/bin
sudo mv /tmp/etcd-download-test/etcdutl /usr/local/bin

验证local single etcd

执行以下命令验证本地运行etcd:

# start a local etcd server
/usr/local/sbin/etcd

# write,read to etcd
etcdctl --endpoints=localhost:2379 put foo bar
etcdctl --endpoints=localhost:2379 get foo

运行本地etcd集群

安装 goreman
```
go get github.com/mattn/goreman
```

备注

go get 是标准的下载和安装软件包和依赖的命令，安装执行程序位于 ~/go/bin 目录。

参考 "go get" command

下载etcd提供的学习案例 Procfile.learner

curl https://raw.githubusercontent.com/etcd-io/etcd/master/Procfile -o ~/go/bin/Procfile.learner

修改一下 Procfile.learner ，将 bin/etcd 修改成 /usr/local/sbin/etcd ，并且启动一个proxy:

# Use goreman to run `go get github.com/mattn/goreman`
etcd1: /usr/local/sbin/etcd --name infra1 --listen-client-urls http://127.0.0.1:2379 --advertise-client-urls http://127.0.0.1:2379 --listen-peer-urls http://127.0.0.1:12380 --initial-advertise-peer-urls http://127.0.0.1:12380 --initial-cluster-token etcd-cluster-1 --initial-cluster 'infra1=http://127.0.0.1:12380,infra2=http://127.0.0.1:22380,infra3=http://127.0.0.1:32380' --initial-cluster-state new --enable-pprof --logger=zap --log-outputs=stderr
etcd2: /usr/local/sbin/etcd --name infra2 --listen-client-urls http://127.0.0.1:22379 --advertise-client-urls http://127.0.0.1:22379 --listen-peer-urls http://127.0.0.1:22380 --initial-advertise-peer-urls http://127.0.0.1:22380 --initial-cluster-token etcd-cluster-1 --initial-cluster 'infra1=http://127.0.0.1:12380,infra2=http://127.0.0.1:22380,infra3=http://127.0.0.1:32380' --initial-cluster-state new --enable-pprof --logger=zap --log-outputs=stderr
etcd3: /usr/local/sbin/etcd --name infra3 --listen-client-urls http://127.0.0.1:32379 --advertise-client-urls http://127.0.0.1:32379 --listen-peer-urls http://127.0.0.1:32380 --initial-advertise-peer-urls http://127.0.0.1:32380 --initial-cluster-token etcd-cluster-1 --initial-cluster 'infra1=http://127.0.0.1:12380,infra2=http://127.0.0.1:22380,infra3=http://127.0.0.1:32380' --initial-cluster-state new --enable-pprof --logger=zap --log-outputs=stderr

proxy: /usr/local/sbin/etcd grpc-proxy start --endpoints=127.0.0.1:2379,127.0.0.1:22379,127.0.0.1:32379 --listen-addr=127.0.0.1:23790 --advertise-client-url=127.0.0.1:23790 --enable-pprof

# A learner node can be started using Procfile.learner

启动本地etcd集群:
```
goreman -f ./Procfile.learner start
```

现在可以通过etcd-proxy入口来访问:

etcdctl --endpoints=127.0.0.1:23790 put foor bar
etcdctl --endpoints=127.0.0.1:23790 get foor

安装运行本地etcd

Linux/macOS安装etcd

验证local single etcd

运行本地etcd集群

参考