docker-compose fails on ubuntu agent "invalid reference format"

[sleppin]

I am running a vsts-agent inside a kubernetes cluster. (microsoft/vsts-agent:ubuntu-16.04-docker-18.06.1-ce-standard).

When I try to run a build step from azure pipelines docker-compose exits with the following error:

Service 'xyz' failed to build: Error parsing reference: "microsoft/dotnet:2.1-aspnetcore-runtime AS base" is not a valid repository/tag: invalid reference format /usr/local/bin/docker-compose failed with return code: 1

The same build step executes without problems when it is run on a windows build agent.

[dakale]

The multistage build syntax requires a minimum version of the docker daemon on the host (https://docs.docker.com/develop/develop-images/multistage-build/)

Are you running in AKS, some other hosted K8s service, or is this on minikube/Docker-for-Windows (with K8s orchestrator)?

You should be able to run docker info on the machine where the agent is running or just as a step in your build, and see if the server version is high enough. Im pretty sure this isnt an issue with these images but I can investigate if your server version is indeed up to date.

[sleppin]

I am running kubernetes on AKS.
The problem is related to Azure/AKS#63 (comment)

Not using the multistage build syntax solved the problem.