terraform {
  required_providers {
    docker = {
      source  = "kreuzwerker/docker"
      version = "3.0.1"
    }
  }
}

provider "docker" {
  host = "unix:///var/run/docker.sock"
  host = "**npipe:////./pipe/docker_engine"**
}

# Pulls the image
resource "docker_image" "ubuntu" {
  name = "ubuntu:latest"
}

# Create a container
resource "docker_container" "foo" {
  image = docker_image.ubuntu.image_id
  name  = "foo"
}

D:\\workspace\\test_terraform>terraform plan
╷
│ **Error: Error initializing Docker client: protocol not available**
│
│   with provider["registry.terraform.io/kreuzwerker/docker"],
│   on main.tf line 10, in provider "docker":
│   10: provider "docker" {
│

terraform 코드로 docker 컨테이너를 생성하는 코드를 작성하여 terraform plan 명령 시

Error: Error initializing Docker client: protocol not available

에러가 발생했습니다. 이는 Terraform이 Docker API 에 연결하지 못하는 경우 발생합니다.

‘provider “docker”’ 블록에서 ‘host’ 매개 변수를 사용하여 Docker API에 대한 호스트 주소를 설정할 수 있습니다.

윈도우에서는 Docker Desktop이 로컬 Docker API를 제공합니다. 기본적으로, ‘host’ 값은 "npipe:////./pipe/docker_engine" 으로 설정되며, 이는 Docker Desktop API를 가리킵니다.

기존의 빨간색 영역의 host 설정은 하늘색 영역인 host 설정으로 변경 후 terraform plan 하니

D:\\workspace\\test_terraform>terraform plan

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the
following symbols:
  + create

Terraform will perform the following actions:

  # docker_container.foo will be created
  + resource "docker_container" "foo" {
      + attach                                      = false
      + bridge                                      = (known after apply)
      + command                                     = (known after apply)
      + container_logs                              = (known after apply)
      + container_read_refresh_timeout_milliseconds = 15000
      + entrypoint                                  = (known after apply)
      + env                                         = (known after apply)
      + exit_code                                   = (known after apply)
      + hostname                                    = (known after apply)
      + id                                          = (known after apply)
      + image                                       = (known after apply)
      + init                                        = (known after apply)
      + ipc_mode                                    = (known after apply)
      + log_driver                                  = (known after apply)
      + logs                                        = false
      + must_run                                    = true
      + name                                        = "foo"
      + network_data                                = (known after apply)
      + read_only                                   = false
      + remove_volumes                              = true
      + restart                                     = "no"
      + rm                                          = false
      + runtime                                     = (known after apply)
      + security_opts                               = (known after apply)
      + shm_size                                    = (known after apply)
      + start                                       = true
      + stdin_open                                  = false
      + stop_signal                                 = (known after apply)
      + stop_timeout                                = (known after apply)
      + tty                                         = false
      + wait                                        = false
      + wait_timeout                                = 60

      + healthcheck {
          + interval     = (known after apply)
          + retries      = (known after apply)
          + start_period = (known after apply)
          + test         = (known after apply)
          + timeout      = (known after apply)
        }

      + labels {
          + label = (known after apply)
          + value = (known after apply)
        }
    }

  # docker_image.ubuntu will be created
  + resource "docker_image" "ubuntu" {
      + id          = (known after apply)
      + image_id    = (known after apply)
      + name        = "ubuntu:latest"
      + repo_digest = (known after apply)
    }

Plan: 2 to add, 0 to change, 0 to destroy.

───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if
you run "terraform apply" now.

plan 명령어를 정상 수행한 후 추가할 작업이 없으면 apply 명령어를 실행하라고 뜨네요.