Connecting to MongoDB Atlas using Golang mgo: Persistent no reachable server to replica set
Asked Answered
A

1

14

I have a replica set from MongoDB atlas, to which I can connect with ANY other language, and regular mongo client, with the URL provided with the format :

mongodb://user:[email protected]:27017,prefix2.mongodb.net:27017,prefix3.mongodb.net:27017/test?&replicaSet=Cluster0-shard-0&authSource=admin

No matter what I tried, adding ssl=true and removing, nothing works. It is always "no reachable server".

I tried every single combination for URL, every combination for dialConfig, and also Dial and DialWithConfig configurations.

What could be the reason ?

Atmospherics answered 15/12, 2016 at 21:35 Comment(1)
Any updates on this?Optimist
H
20

Using MongoDB Go driver mgo code snippet below to connect to MongoDB Atlas works, using your example data:

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)

Note that you can also specify only one of the replica set members as a seed. For example:

Addrs: []string{"prefix2.mongodb.net:27017"}

See also:

Update:

You could also use ParseURL() method to parse MongoDB Atlas URI string. However, currently this method does not support SSL (mgo.V2 PR:304)

A work around is to take out the ssl=true line before parsing.

//URI without ssl=true
var mongoURI = "mongodb://username:[email protected],prefix2.mongodb.net,prefix3.mongodb.net/dbName?replicaSet=replName&authSource=admin"

dialInfo, err := mgo.ParseURL(mongoURI)

//Below part is similar to above. 
tlsConfig := &tls.Config{}
dialInfo.DialServer = func(addr *mgo.ServerAddr) (net.Conn, error) {
    conn, err := tls.Dial("tcp", addr.String(), tlsConfig)
    return conn, err
}
session, _ := mgo.DialWithInfo(dialInfo)
Hemicycle answered 1/3, 2017 at 3:40 Comment(5)
Would you be able to advise on how the connection string would look if dialInfo was generated via this way instead? dialInfo, err := mgo.ParseURL(url). Appreciated.Optimist
Hi @Wan Bachtiar, any idea in how to parse the new URLS for Atlas in Mongo 3.6. Eg. "mongodb+srv://kay:[email protected]/?serverSelectionTryOnce=false&serverSelectionTimeoutMS=15000"Rocker
@Rocker the new official mongo-go-driver should support that. If you’re still having an issue please open a new question and link it here. Please provide the go driver and version that you’re using. CheersHemicycle
@WanBachtiar thanks Wan, Tested and working using the official driver.Rocker
just small update set Source in DialInfo else you can get following error panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1455022] I have set source: "admin" which works fine to me.Ovi

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