Why Does My Go mgo Driver Fail to Connect to MongoDB Atlas Replica Set with a \'No Reachable Server\' Error?

Connecting to MongoDB Atlas Using Golang Mgo: Resolving "No Reachable Server to Replica Set" Issue

Question:

When connecting to a replica set on MongoDB Atlas using the Golang mgo driver, an error message of "no reachable server" is encountered despite successful connections with other languages and the regular Mongo client.

Answer:

A modified version of the mgo code snippet below successfully establishes a connection to MongoDB Atlas using the provided example parameters:

import (
    "gopkg.in/mgo.v2"
    "crypto/tls"
    "net"
)

tlsConfig := &tls.Config{}

dialInfo := &mgo.DialInfo{
    Addrs: []string{"prefix1.mongodb.net:27017", 
                    "prefix2.mongodb.net:27017",
                    "prefix3.mongodb.net:27017"},
    Database: "authDatabaseName",
    Username: "user",
    Password: "pass",
}
dialInfo.DialServer = func(addr *mgo.ServerAddr) (net.Conn, error) {
    conn, err := tls.Dial("tcp", addr.String(), tlsConfig)
    return conn, err
}
session, err := mgo.DialWithInfo(dialInfo)

Consideration:

• You can specify only one of the replica set members as a seed, such as: Addrs: []string{"prefix2.mongodb.net:27017"}.
• The mgo.ParseURL() method does not currently support SSL, so using it to parse the MongoDB Atlas URI string requires removing the ssl=true line beforehand.

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