https://blog.csdn.net/Mr_XiMu/article/details/125026635
https://blog.csdn.net/m0_73192864/article/details/136509244

etcd在生产环境中一般为集群方式部署
etcd使用的2个默认端口号：2379和2380
2379：用于客户端通信(类似于sqlserver的1433，mysql的3306)
2380：用于与集群中的Peer通信
因为etcd是go语言编写的，安装只需要下载对应的二进制文件，并放到合适的路径就行

https://github.com/etcd-io/etcd/tags

安装方式一，用官方提供的脚本（没成功）

https://github.com/etcd-io/etcd/releases/tag/v3.4.33
https://blog.csdn.net/Mr_XiMu/article/details/125026635

mkdir /opt/soft
mkdir /opt/soft/etcd/ && cd  /opt/soft/etcd/

vim etcd

ETCD_VER=v3.5.13# choose either URL 
GOOGLE_URL=https://storage.googleapis.com/etcd
GITHUB_URL=https://github.com/etcd-io/etcd/releases/download
DOWNLOAD_URL=${GOOGLE_URL}rm -f /opt/soft/etcd/etcd-${ETCD_VER}-linux-amd64.tar.gz
rm -rf /opt/soft/etcd/etcd-download-test && mkdir -p /opt/soft/etcd/etcd-download-testcurl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o /opt/soft/etcd/etcd-${ETCD_VER}-linux-amd64.tar.gz
tar -zxvf /opt/soft/etcd/etcd-${ETCD_VER}-linux-amd64.tar.gz -C /opt/soft/etcd/etcd-download-test --strip-components=1
rm -f /opt/soft/etcd/etcd-${ETCD_VER}-linux-amd64.tar.gz#查看安装是否成功的相关命令
/opt/soft/etcd/etcd-download-test/etcd --version
/opt/soft/etcd/etcd-download-test/etcdctl version
/opt/soft/etcd/etcd-download-test/etcdutl version

chmod 777 etcd
# start a local etcd server
./etcd# write,read to etcd
/tmp/etcd-download-test/etcdctl --endpoints=localhost:2379 put foo bar
/tmp/etcd-download-test/etcdctl --endpoints=localhost:2379 get foo

应该是download压缩包的问题，不纠结的去找了。

方式二，逐个执行官方提供脚本（成功）

mkdir /usr/local/mytools && cd /usr/local/mytoolswget https://github.com/etcd-io/etcd/releases/download/v3.4.3/etcd-v3.4.3-linux-amd64.tar.gz tar xzvf etcd-v3.4.3-linux-amd64.tar.gzcd etcd-v3.4.3-linux-amd64 && lscp etcd etcdctl /usr/local/bin
# etcd是server端，etcdctl是客户端
# 将这etcd和etcdctl两个二进制文件复制到/usr/local/bin目录, 这样系统中可以直接调用etcd/etcdctl这两个程序etcd --version
etcdctl version

方式三，docker安装（未测试）

rm -rf /tmp/etcd-data.tmp && mkdir -p /tmp/etcd-data.tmp && \docker rmi gcr.io/etcd-development/etcd:v3.4.33 || true && \docker run \-p 2379:2379 \-p 2380:2380 \--mount type=bind,source=/tmp/etcd-data.tmp,destination=/etcd-data \--name etcd-gcr-v3.4.33 \gcr.io/etcd-development/etcd:v3.4.33 \/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 stderrdocker exec etcd-gcr-v3.4.33  /usr/local/bin/etcd --version
docker exec etcd-gcr-v3.4.33  /usr/local/bin/etcdctl version
docker exec etcd-gcr-v3.4.33  /usr/local/bin/etcdctl endpoint health
docker exec etcd-gcr-v3.4.33  /usr/local/bin/etcdctl put foo bar
docker exec etcd-gcr-v3.4.33  /usr/local/bin/etcdctl get foo

简单操作

启动etcd服务端 etcd

 1.name表示节点名称，默认为default。2.data-dir 保存日志和快照的目录，默认为当前工作目录default.etcd/目录下。3.在http://localhost:2380和集群中其他节点通信。4.在http://localhost:2379提供客户端交互。5.heartbeat为100ms，该参数的作用是leader多久发送一次心跳到followers，默认值是100ms。6.election为1000ms，该参数的作用是重新投票的超时时间，如果follow在该时间间隔没有收到心跳包，会触发重新投票，默认为1000ms。7.snapshot count为10000，该参数的作用是指定有多少事务被提交时，触发截取快照保存到磁盘。8.集群和每个节点都会生成一个uuid。9.启动的时候会运行raft，选举出leader

客户端读写数据

etcdctl --endpoints=localhost:2379 put foo bar
etcdctl --endpoints=localhost:2379 get foo

删除数据

# 清空数据
etcdctl del / --prefix#删除所有/test前缀的节点
etcdctl del /test --prefix

监听

#1. 增加一个key，值为hello（客户端窗口1）
etcdctl put key1 "hello"#2. 打开一个新的客户端窗口2，监听key1的变化
etcdctl watch key1#3. 回到窗口1，向key1 中删除原有的值put新值为hello work
etcdctl put key1 "hello work"# 4. 此时可以在窗口2中看到监听输出# 查看版本信息
curl http://127.0.0.1:2379/version

为etcd创建服务

mkdir -p /var/lib/etcd/ && mkdir -p /etc/etcd/
vim /etc/etcd/etcd.conf

# 节点名称
ETCD_NAME="etcd0"
# 指定数据文件存放位置
ETCD_DATA_DIR="/var/lib/etcd/"

vim /etc/systemd/system/etcd.service

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target[Service]
User=root
Type=notify
WorkingDirectory=/var/lib/etcd/
EnvironmentFile=-/etc/etcd/etcd.confExecStart=/usr/local/bin/etcd
Restart=on-failure
LimitNOFILE=65536[Install]
WantedBy=multi-user.target

重新加载systemd服务

systemctl daemon-reload

记得要把之前的etcd进程给kill掉

 ps -ef | grep etcdkill -9 [etcd进程对应pid]

systemctl enable etcd   #开机自启动
systemctl status etcd
systemctl start etcd
systemctl stop etcd
systemctl restart etcd