etcd test

main.go

package main

import (
	"context"
	"fmt"
	"os"
	"time"

	"github.com/coreos/etcd/clientv3"
)

func main() {

	cli, err := clientv3.New(clientv3.Config{
		Endpoints:   []string{"http://example.com:2379"},
		DialTimeout: 2 * time.Second,
	})
	if err != nil {
		fmt.Fprintln(os.Stderr, "[initialize etcd client]", err)
		return
	}
	defer cli.Close()

	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()

	resp, err := cli.MemberList(ctx)
	if err != nil {
		fmt.Fprintln(os.Stderr, "[getting etcd members]", err)
		return
	}
	fmt.Fprintln(os.Stdout, "current member count =", len(resp.Members))

}

Using etcd on v3.3.9:

$ go run main.go
[initialize etcd client] context deadline exceeded

Using etcd on master (af85949b)

$ go run main.go
[getting etcd members] context deadline exceeded