ERROR: Version in "./docker-compose.yml" is unsupported. You might be seeing this error because you're using the wrong Compose file version

Question

Here is the docker-compose.yml

version: “2”
services:
  web:
   build: .
   environment:
    MONGO_URI="mongodb://ravimongo:27017"
   ports:
    — “3000:3000”
   links:
    — ravimongo
   depends_on:
    — ravimongo
  ravimongo:
   image: mongo:3.2.6
   ports:
     — “27017:27017”

Here is the error:

ERROR: Version in "./docker-compose.yml" is unsupported. You might be seeing this error because you're using the wrong Compose file version. Either specify a supported version ("2.0", "2.1", "3.0") and place your service definitions under the `services` key, or omit the `version` key and place your service definitions at the root of the file to use version 1.
For more on the Compose file format versions, see https://docs.docker.com/compose/compose-file/

Version details are as follows: docker-compose version

docker-compose version 1.11.2, build dfed245
docker-py version: 2.1.0
CPython version: 2.7.12
OpenSSL version: OpenSSL 1.0.2j  26 Sep 2016

docker version

Client:
 Version:      17.03.1-ce
 API version:  1.27
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Tue Mar 28 00:40:02 2017
 OS/Arch:      darwin/amd64

Server:
 Version:      17.03.1-ce
 API version:  1.27 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   c6d412e
 Built:        Fri Mar 24 00:00:50 2017
 OS/Arch:      linux/amd64
 Experimental: true

I verified the yaml syntax in http://www.yamllint.com/ and https://codebeautify.org/yaml-validator. I am unable to find the problem.

Similar: [Version in docker-compose is unsupported](https://stackoverflow.com/q/47972328/55075). — kenorb, Aug 13 '18 at 13:34

score 7 · Accepted Answer · answered Jun 14 '17 at 17:49

The YAML is valid. However, you are using a left double quotation mark “ like so:

version: “2”

Based on the error, seems like Docker Compose is not able to parse the version correctly. If you use a left double quotation mark instead of a quotation mark, the version which will be picked up by Docker compose will be “2” and not 2, and hence it shall not be able to equate it to the supported versions ("2.0", "2.1", "3.0"). I would suggest changing it to the following:

version: "2"

Let me know if the errors still persist.

score 5 · Answer 2 · edited Dec 08 '17 at 07:58

5

Your editor is injecting smart-quotes instead of normal ascii quotes here:

version: “2”

This needs to be:

version: "2"

I'd recommend not writing yml files with that editor to avoid issues in the future.

edited Dec 08 '17 at 07:58

StackedCrooked

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answered Jun 14 '17 at 16:34

BMitch

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Thank you very much. I am using vim. I am marking the other answer because it is a little more detailed for anybody who visits. – Ravikanth Andhavarapu Jun 15 '17 at 05:32
@ravikanth Vim did that? Did you have a plugin or keyboard for the different quote? I'm used to seeing that more from a word processor that a text editor. – BMitch Jun 15 '17 at 11:07
1

yes. It is vim. I am not sure why it is happening in vim. I solved it using Sublime. – Ravikanth Andhavarapu Jun 15 '17 at 11:40
@ravikanth Sounds like someone may have installed this plugin: https://github.com/reedes/vim-textobj-quote/ – BMitch Jun 15 '17 at 12:12
1

I'm seeing vim-surround in there which has the ability to change quotes. May want to check that. – BMitch Jun 16 '17 at 17:12

score 2 · Answer 3 · answered Jun 14 '17 at 11:04

2

As stated in the error logs you should replace it by "2.0" instead of simply "2".

answered Jun 14 '17 at 11:04

Iman

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score 1 · Answer 4 · answered Sep 03 '19 at 07:52

1

Docker engine should be compliant with the file version. Following page can be checked which engine should be used with which compose file format.

https://docs.docker.com/compose/compose-file/

answered Sep 03 '19 at 07:52

luckystones

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ERROR: Version in "./docker-compose.yml" is unsupported. You might be seeing this error because you're using the wrong Compose file version

4 Answers4