Cannot connect to MongoDB running in local Docker container

Question

I have this command to start MongoDB in a container:

docker run -p 27017:27017 --name cdt-mongo mongo

this is from these docs:

https://hub.docker.com/_/mongo/

I actually think the

-p 27017:27017

is superfluous. anyway.

Locally, I run the container in one terminal, and then in another terminal I issue the mongo command, and I get:

$ mongo
MongoDB shell version v3.4.2
connecting to: mongodb://127.0.0.1:27017
2017-05-02T11:27:22.864-0700 W NETWORK  [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: Connection refused
2017-05-02T11:27:22.866-0700 E QUERY    [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:237:13
@(connect):1:6
exception: connect failed

anybody know why I cannot connect to mongodb running in the container?

Firstly, you have -d and --rm, and according to the docs, this is not allowed. — Matt Clark
– Matt Clark, Commented May 2, 2017 at 18:32
I can not reproduce with your commands, what is the docker logs containerId output? — François Maturel
– François Maturel, Commented May 2, 2017 at 18:34
Have you checked the mongo container's logs, to see if it is running smoothly or not? — Vince Bowdren
– Vince Bowdren, Commented May 2, 2017 at 18:36
@MattClark thanks, good catch, but that's not the root problem — Alexander Mills
– Alexander Mills, Commented May 2, 2017 at 18:54
Thanks all, even if it's not running as a daemon, I have the same problem. I have removed both the -d and -rm flags. Same problem persists. When I run the container without daemon flag, I get "2017-05-02T18:38:24.665+0000 I NETWORK [thread1] waiting for connections on port 27017"....so it should be listening on the expected port right? — Alexander Mills
– Alexander Mills, Commented May 2, 2017 at 18:55

Alexander Mills · Accepted Answer · 2017-05-02 19:18:03Z

1

because I am on MacOS, I should not connect to

localhost:27017

but instead use the host/ip address of the docker-machine VM

HOST=$(docker-machine ip)

and then connect to it like so:

mongo --host $HOST

answered May 2, 2017 at 19:18

Alexander Mills

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4 Comments

andresk Over a year ago

just an observation, you don't need to use docker-machine anymore, you can use the native docker, so you would be able to use localhost

Alexander Mills Over a year ago

thanks, that would be great - do you have a link to that? I don't how to find info on how to use Docker on MacOS w/o docker-machine.

Alexander Mills Over a year ago

I guess this is good enough: blog.docker.com/2016/03/docker-for-mac-windows-beta

andresk Over a year ago

If you go to their official website docker.com/community-edition all tutorials will now be using the native Docker, as it's not Beta anymore

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