DOCKER_HOST environment variable on windows

Question

I'm running Docker 1.12.0 on a Windows 10 machine. I'm developing a Java program, using Maven 3.3.9 as a dependency manager. I have a maven docker plugin (https://github.com/fabric8io/docker-maven-plugin), which gives the following error on clean install.

[ERROR] Failed to execute goal io.fabric8:docker-maven-plugin:0.15.16:build (docker-build-start) on project integration-test: Execution docker-build-start of goal io.fabric8:docker-maven-plugin:0.15.16:build failed: No <dockerHost> or <machine> given, no DOCKER_HOST environment variable, and no read/writable '/var/run/docker.sock' -> [Help 1]

When I run a clean install with the following configuration option in the POM file:

<dockerHost>tcp://0.0.0.0:2376</dockerHost>

the following result is shown.

[ERROR] Failed to execute goal io.fabric8:docker-maven-plugin:0.15.16:build (docker-build-start) on project integration-test: Cannot create docker access object: Cannot extract API version from server https://0.0.0.0:2376: Connect to 0.0.0.0:2376 [/0.0.0.0] failed: Connection refused: connect -> [Help 1]

My question: is there an IP address I can use to tell this maven plugin where it can reach the daemon? Normal docker commands work perfectly fine. The plugin works without any problems on OS X.

Answer 1

On Windows 10 with Docker for Windows, the Docker Engine API is available in these two locations:

• npipe:////./pipe/docker_engine
• http://localhost:2375

I recommend trying with the localhost one.

Details here: https://docs.docker.com/docker-for-windows/faqs/#/how-do-i-connect-to-the-remote-docker-engine-api