terraform-provider-docker/examples/resources/docker_image/resource.tf

# Find the latest Ubuntu precise image.
resource "docker_image" "ubuntu" {
  name = "ubuntu:precise"
}

# Access it somewhere else with ${docker_image.ubuntu.latest}

# image "zoo" and "zoo:develop" are built
resource "docker_image" "zoo" {
  name = "zoo"
  build {
    path = "."
    tag  = ["zoo:develop"]
    build_arg = {
      foo : "zoo"
    }
    label = {
      author : "zoo"
    }
  }
}

# Dynamic image
data "docker_registry_image" "ubuntu" {
  name = "ubuntu:precise"
}

resource "docker_image" "ubuntu" {
  name          = data.docker_registry_image.ubuntu.name
  pull_triggers = [data.docker_registry_image.ubuntu.sha256_digest]
}