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Using the Docker mock engine

Imposter supports different mock engine types: Docker, JVM and Native. This document describes how to use the Docker engine.

Prerequisites

Install Docker: https://docs.docker.com/get-docker/

Ensure Docker is running. (You can check this with a docker info).

Configuration

Note: The Docker engine is the default, so you do not need to configure this explicitly.

If you still want to specify which engine to use, follow these steps.

User default

The easiest way to set the engine type is to edit your user default configuration in:

$HOME/.imposter/config.yaml

Set the engine key to docker:

engine: docker

Environment variable

If you don't want to set your user defaults you can set the following environment variable:

IMPOSTER_ENGINE=docker

You can also change the registry to use by setting the IMPOSTER_DOCKER_REGISTRY environment variable:

IMPOSTER_DOCKER_REGISTRY=ghcr.io/someorg/

Command line argument

You can also provide the --engine-type (or -t) command line argument to the imposter up command:

Example:

imposter up --engine-type docker

Or:

imposter up -t docker