Why Does My Go Application Fail to Connect to Mongo Cloud on Ubuntu with a \'cannot unmarshal DNS message\' Error?

Connecting to Mongo Cloud Database from Go on Ubuntu: Troubleshooting

Connecting to a Mongo Cloud database using Go can sometimes present challenges, particularly when transitioning between operating systems. This error encountered on Ubuntu, "error parsing uri...cannot unmarshal DNS message," is not directly related to the MongoDB Go driver but rather stems from a specific behavior in Go version 1.11.x.

Root Cause

The error arises due to a tightening of SRV record handling in Go version 1.11.x, specifically in the net.lookupSRV() function. This results in the rejection of compressed domain names in SRV records, as defined by RFC-2782. Some DNS servers, such as the embedded Docker DNS, may return SRV records with compressed domain names, leading to the error message.

Workarounds

To resolve this issue, you have two options:

• Use non-SRV MongoDB URL: Create a MongoDB URI that does not utilize SRV records, connecting directly to the database.
• Update /etc/resolv.conf: Modify the resolv.conf file and replace the nameserver address with a compliant public DNS server, such as 1.1.1.1 or 8.8.8.8. This will ensure that your system uses a DNS server that adheres to the SRV record formatting requirements.

Additional Reference

For further information, refer to the MongoDB Go driver issue, GODRIVER-829.

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