etcd部署以及Golang实现CRUD

部署步骤
Golang实现CRUD
参考链接

部署步骤

1.安装etcd

git clone -b v3.5.0 https://github.com/etcd-io/etcd.git
cd etcd
./build.sh
export PATH="$PATH:`pwd`/bin"
etcd --version

2.组建集群

在每个etcd节点上，指定集群成员

TOKEN=token-01
CLUSTER_STATE=new
NAME_1=machine-1
NAME_2=machine-2
NAME_3=machine-3
HOST_1=192.168.135.133
HOST_2=192.168.135.134
HOST_3=192.168.135.135
CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380

在对应的机器上运行对应指令

# For machine 1
THIS_NAME=${NAME_1}
THIS_IP=${HOST_1}
etcd --data-dir=data.etcd --name ${THIS_NAME} \
	--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
	--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
	--initial-cluster ${CLUSTER} \
	--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

# For machine 2
THIS_NAME=${NAME_2}
THIS_IP=${HOST_2}
etcd --data-dir=data.etcd --name ${THIS_NAME} \
	--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
	--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
	--initial-cluster ${CLUSTER} \
	--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

# For machine 3
THIS_NAME=${NAME_3}
THIS_IP=${HOST_3}
etcd --data-dir=data.etcd --name ${THIS_NAME} \
	--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
	--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
	--initial-cluster ${CLUSTER} \
	--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

3. 现在etcd准备好了，使用etcdctl连接到etcd

export ETCDCTL_API=3
HOST_1=192.168.135.133
HOST_2=192.168.135.134
HOST_3=192.168.135.135
ENDPOINTS=$HOST_1:2379,$HOST_2:2379,$HOST_3:2379
etcdctl --endpoints=$ENDPOINTS member list

Golang实现CRUD

package main

import (
	"context"
	"fmt"
	"go.etcd.io/etcd/client/v3"
	"time"
)

func main() {
	cli, err := clientv3.New(clientv3.Config{
		Endpoints:   []string{"192.168.135.133:2379", "192.168.135.134:2379", "192.168.135.135:2379"},
		DialTimeout: 5 * time.Second,
	})
	if err != nil {
		fmt.Printf("connect to etcd failed, err:%v\n", err)
		return
	}
	defer cli.Close()
	fmt.Println("connect to etcd success")
	defer cli.Close()

	go Watch(cli)

	Create(cli)
	Read(cli)
	Delete(cli)
	Update(cli)
	select {}
}

func Watch(cli *clientv3.Client) {
	rch := cli.Watch(context.Background(), "name") // type WatchChan <-chan WatchResponse
	for wresp := range rch {
		for _, ev := range wresp.Events {
			fmt.Printf("Type: %s Key:%s Value:%s\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
		}
	}
	fmt.Println("out")
}

func Create(cli *clientv3.Client) {
	// put
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
	_, err := cli.Put(ctx, "name", "wxf")
	cancel()
	if err != nil {
		fmt.Printf("put to etcd failed, err:%v\n", err)
		return
	}
}

func Read(cli *clientv3.Client) {
	//get
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
	resp, err := cli.Get(ctx, "name")
	cancel()
	if err != nil {
		fmt.Printf("get from etcd failed, err:%v\n", err)
		return
	}
	for _, ev := range resp.Kvs {
		fmt.Printf("Type: %s Key:%s Value:%s\n", "READ", ev.Key, ev.Value)
	}
}

func Update(cli *clientv3.Client) {
	// put
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
	_, err := cli.Put(ctx, "name", "xyy")
	cancel()
	if err != nil {
		fmt.Printf("put to etcd failed, err:%v\n", err)
		return
	}
}

func Delete(cli *clientv3.Client) {
	//del
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
	_, err := cli.Delete(ctx, "name")
	cancel()
	if err != nil {
		fmt.Printf("delete from etcd failed, err:%v\n", err)
		return
	}
}