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I was trying to build a mongo container from mongo image the mongo server didnot start

The commands i used were

docker pull mongo

docker run -d -p 27017:27017 -v $PWD/mongodata:/data/db --network host --name mongodb mongo

Then i tested it by entering the container by using

docker exec -it mongodb bash

then when i type "mongo" in the terminal of the container it showed that it was not able to connect to server

Any ideas on what might have went wrong

idris
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1 Answers1

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In order to debug something like this, run it without -d to see the errors clearly in the standard output.

Your problem is most likely one of two:

  1. The fact that you are mixing --port and --network host
  2. The directory you are mounting to is NFS or otherwise non standard (are you using Vagrant?).

Try this first (without a volume), see if it works:

$ docker run --rm -p 27017:27017 --name mongodb mongo

If it does, add the the volume, but this time, use a different directory, for example:

$ docker run --rm -p 27017:27017 -v /tmp/mongodata:/data/db --name mongodb mongo

Also note that I have removed the --network host - you should not mix port exposure and host network. Choose one or the other.

After this, before even trying to connect, confirm it is running:

$ docker ps

And finally, connect to it either from the host or from within the container:

$ docker exec -it mongodb mongo

Finally, as another way of experimenting with any docker stack, consider using docker compose. Here is one for your mongo experiments:

version: '3'

services:
  server:
    image: mongo
    ports: ["27017:27017"]

  client:
    image: mongo
    depends_on: [server]
    entrypoint: mongo --host server

And now you can just run:

$ docker-compose run --rm client
DannyB
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