Cannot connect to local mongodb from containerized application on local

Nikolay_Karasev · 2024-04-26T04:35:20.959Z

I am running local mongodb on Ubuntu, all latest. Connecting from a regular local application is fine. However when I am running a java application in docker container locally, the same app does not connect. Tried using host.docker.internal - this is not regognized. Tried to use actual local IP as 192.168.1.100 or docker specific local IP as 172.17.0.1 both are recognised, however getting connection refused. Java exception is:
exception={com.mongodb.MongoSocketOpenException: Exception opening socket}, caused by {java.net.ConnectException: Connection refused}}
Is there any specific configuration in local mongodb that might prevent accepting this connection? I am assuming the port should not change from default being 27017

Thanks

Peter_Hubbard · 2024-04-26T09:13:43.212Z

Is the mongodb instance configured to accept connections from your container’s IP address?

steevej · 2024-04-26T11:35:19.062Z

Share the command you used to start your docker instance.

Nikolay_Karasev · 2024-04-26T16:44:29.956Z

Docker is started as daemon on Ubuntu. I would not know exact command, I believe it is as default as possible.

Thanks

Nikolay_Karasev · 2024-04-26T16:44:35.526Z

I did not realize local docker has its own IP address, thanks for the hint. Figured out it is 172.17.0.2
However I am now not sure where the heck local mongodb has its configuration. Mongo is very much quiet about anything that is not Atlas - any queries in google give everything about Atlas but almost no documentation about local deployment. So where is that configuration for local?

Thanks

john_sam · 2024-04-27T01:53:17.378Z

make sure that firewall and antivirus do not block the MongoDB connection on port 27017.

Peter_Hubbard · 2024-04-30T15:35:27.479Z

The location of the configuration file would depend on the operating system and how you installed MongoDB: https://www.mongodb.com/docs/manual/reference/configuration-options/