CreateSession：没有可访问的服务器-mgo

Question

我正在尝试使用mgo连接到MongoDB Atlas免费集群。

Golang代码-

package main

import (
     "fmt"
     "gopkg.in/mgo.v2"
     "time"
     "log"
)

const (
    AuthDatabase = "mydatabase"
    AuthUserName = "databaseadmin"
    AuthPassword = "databasepassword"
    ReplicaSetName = "myproject-shard-0"
)

func main(){

MongoDBHosts := []string{
    "myproject-shard-00-00-w4vds.mongodb.net:27017",
    "myproject-shard-00-01-w4vds.mongodb.net:27017",
    "myproject-shard-00-02-w4vds.mongodb.net:27017",
}

mongoDBDialInfo := &mgo.DialInfo{
    Addrs:    MongoDBHosts,
    Timeout:  60 * time.Second,
    Database: AuthDatabase,
    Username: AuthUserName,
    Password: AuthPassword,
    ReplicaSetName: ReplicaSetName,
}

mongoSession, err := mgo.DialWithInfo(mongoDBDialInfo)
if err != nil {
    log.Fatalf("CreateSession: %s\n", err)
}

defer  mongoSession.Close()
fmt.Printf("Connected to replica set %v!\n", mongoSession.LiveServers())
}

错误信息 -

CreateSession：没有可访问的服务器

环境

我将mongodb free cluster与Google App Engine GO SDK结合使用

Answer 1

要连接到MongoDB Atlas，您需要SSL

先决条件

TLS/SSL

    Clients must have support for TLS/SSL to connect to an Atlas cluster.

    Clients must have support for the SNI TLS extension to connect to an Atlas M0 Free Tier cluster.


Whitelist

    To access a cluster, you must connect from an IP address on the Atlas group’s IP whitelist. If you need to add an IP address to the whitelist, you can do so in the Connect dialog. You can also add the IP address from the Security tab.

因此，我不得不更改以下代码

mongoDBDialInfo := &mgo.DialInfo{
    Addrs:    MongoDBHosts,
    Timeout:  60 * time.Second,
    Database: AuthDatabase,
    Username: AuthUserName,
    Password: AuthPassword,
    ReplicaSetName: ReplicaSetName,
}

mongoDBDialInfo.DialServer = func(addr *mgo.ServerAddr) (net.Conn, error) {
        conn, err := tls.Dial("tcp", addr.String(), tlsConfig)
        return conn, err
    }

我也必须导入以下内容

"crypto/tls" 
"net"