(Terraform) 左操作数的值不合适：需要一个数字

Question

在GCP上，我尝试使用下面的 Terraform 代码运行Cloud Run服务“renderer”，在此代码中，我使用plus(连接“gcr.io/”、变量var.project_id和“/renderer:latest” +) :

resource "google_cloud_run_service" "renderer" {
  name     = "renderer"
  location = "asia-northeast1"

  template {
    spec {
      containers {
        image = "gcr.io/" + var.project_id + "/renderer:latest" // Here
      }
      service_account_name = google_service_account.renderer_identity.email
    }
  }

  traffic {
    percent         = 100
    latest_revision = true
  }
}

然后，当我应用上面的代码时，出现以下错误：

resource "google_cloud_run_service" "renderer" {
  name     = "renderer"
  location = "asia-northeast1"

  template {
    spec {
      containers {
        image = "gcr.io/" + var.project_id + "/renderer:latest" // Here
      }
      service_account_name = google_service_account.renderer_identity.email
    }
  }

  traffic {
    percent         = 100
    latest_revision = true
  }
}

是否不能使用plus(+)进行连接？如果不可能，我该如何在Terraform中进行串联？

Answer 1

是的，在Terraform中不可能使用plus(+)进行串联。因此，您需要使用“插值语法” ${var.project_id}进行串联，如下所示，而不是plus(+)：

resource "google_cloud_run_service" "renderer" {
  name     = "renderer"
  location = "asia-northeast1"

  template {
    spec {
      containers {
        image = "gcr.io/${var.project_id}/renderer:latest" // Here
      }
      service_account_name = google_service_account.renderer_identity.email
    }
  }

  traffic {
    percent         = 100
    latest_revision = true
  }
}

另外，不能使用plus(+)进行连接，但可以使用plus(+)进行计算。例如，您的Terraform代码在“traffic”块中有“percent”：

resource "google_cloud_run_service" "renderer" {
  name     = "renderer"
  location = "asia-northeast1"

  template {
    spec {
      containers {
        image = "gcr.io/${var.project_id}/renderer:latest" // Here
      }
      service_account_name = google_service_account.renderer_identity.email
    }
  }

  traffic {
    percent         = 100
    latest_revision = true
  }
}

然后，您可以使用plus(+)将30添加到100：

traffic {
  percent         = 100
  latest_revision = true
}

而且，甚至数字字符串“100”和“30”也可以计算为Number 类型：

traffic {
  percent         = 100 + 30 // 130
  latest_revision = true
}