etcd部署以及Golang实现CRUD

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

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

# 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}

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

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
  }
}