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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
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  • Have you seen this?
    – mustaccio
    Aug 22, 2023 at 14:44
  • @mustaccio yes I have. I have tried every possible variation of the [] / [x,x] / [x;x] and x,x / x;x / x, x syntax and I either get 'scalar option 'net.bindIp must be a single value' or it fails to start the daemon. I have edited the question to say I have also tried reinstalling the MongoDB instance.
    – Yenmangu
    Aug 22, 2023 at 15:10
  • I haven't test with latest versions, but earlier versions there was "feature" that if there was even one space character in that bindIp, it failed. 192.168.2.29,127.0.0.1
    – JJussi
    Aug 22, 2023 at 16:57
  • yes, I have tried all possible variations of the syntax with spaces and without spaces
    – Yenmangu
    Aug 22, 2023 at 17:06
  • What is the output of ifconfig? Aug 23, 2023 at 5:27

1 Answer 1

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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.

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