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

Question

Here's my docker-compose.yml file:

version: '3.1'  services:   a:     image: tutum/hello-world   b:     image: tutum/hello-world  secrets:   id: my_password 

If I run $ docker-compose-up I get this:

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

My docker-compose version:

$ docker-compose --version docker-compose version 1.11.0, build 6de1806 

What's wrong here? Shouldn't my docker-compose version support v3.1 of the docker-compose.yml specification (according to the release notes, it does) ?

Answer 1

You are doing everything right and it should work. But there was a bug in docker-compose 1.11.0 which not recognized file format 3.1 as valid. (3.0 works).

There is already a new release of docker-compose (1.11.1) which includes the bugfix:

Bugfixes

Fixed a bug where the 3.1 file format was not being recognized as valid by the Compose parser

So I would recommend to upgrade your docker-compose version if you want to use file format 3.1.

At the moment the safest way to upgrade docker-compose is by deleting it and reinstalling it.

rm /usr/local/bin/docker-compose 

Reinstall:

curl -L https://github.com/docker/compose/releases/download/1.11.1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose chmod +x /usr/local/bin/docker-compose docker-compose --version docker-compose version 1.11.1, build 7c5d5e4 

Now there isn't an error anymore on the file format. (I did not test with your .yml).

docker-compose up Starting compose_a_1 Starting compose_b_1 

Answer 2

I have resolved the issue by upgrading docker-compose.

Follwed below steps to upgrade docker-compose in ubuntu16.04

step1:

$which docker-compose /usr/bin/docker-compose 

step2:

$sudo rm /usr/bin/docker-compose 

step3:

curl -L https://github.com/docker/compose/releases/download/1.20.0/docker-compose-`uname -s`-`uname -m` -o /usr/bin/docker-compose 

step4:

chmod +x /usr/bin/docker-compose