Assigning multiple IP addresses to MongoDB 7.0 on Ubuntu

Question

The Problem

I am trying but failing, in MongoDB 7.0, on Ubuntu, to bind multiple IP addresses to net.bindIp in mongod.conf

What I have tried

I have tried 127.0.0.1,x.x.x.x, 127.0.0.1;x.x.x.x, [127.0.0.1,x.x.x.x], [127.0.0.1;x.x.x.x] and mongod fails to start on each and everyone.

when the syntax is

[127.0.0.1,x.x.x.x] I get this error

Aug 22 11:52:36 ip-172-26-1-93 mongod[41708]: Scalar option 'net.bindIp' must be a single value

and when I use any other syntax, I get this error

Aug 22 11:54:38 ip-172-26-1-93 mongod[41723]: {"t":{"$date":"2023-08-22T11:54:38.935Z"},"s":"I",  "c":"CONTROL",  "id":7484500, "ctx":"main","msg":"Environment variable MONGODB_CONFIG_OVERRIDE_NOFORK == 1, overriding \"processManagement.fork\" to false"}

Where I have looked

After searching this extensively, I found this answer here and the answers to this question here and after tryin their solutions I still get the same errors.

I have looked at the documentation for the latest version and I can't see where I am going wrong.

Additional

I can successfully bind 0.0.0.0, however this then defeats the object of using net.bindIp

Edit

1. I have tried reinstalling MongoDB 3 times now, and still the same issue

Answer 1

Actually there is no reason to assign multiple IP-Addresses. This makes only sense on a computer with multiple network interfaces. However, since MongoDB does not support multiple network interfaces, it would be pointless anyway.

Either use net.bindIpAll: true if you like to permit connections from remote machines or use net.bindIp: localhost if you need to permit connections only from the local machine.

Anything else does not make much sense.