【解决了一个小问题】terraform创建service后，如何获取VIP的值？

作者:张富春(ahfuzhang)，转载时请注明作者和引用链接，谢谢！

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创建一个pod后，再为这个pod创建一个对应的service，便于公开一个地址给外部访问。

有时候需要根据service的vip，再进行下一步的配置。

下面的代码演示如何获取service的vip:

# 最核心的配置
terraform {
  required_providers {
    kubernetes = {
      source  = "hashicorp/kubernetes"
      version = ">= 2.0.0"
    }
  }

  backend "local" {

  }
}

# TKE群集的IP和KEY
provider "kubernetes" {
  config_path = "../tencentyun-cls-xxxx-config.yaml"
}

# 这里省略创建容器的代码

# 创建POD对应的service
resource "kubernetes_service" "vm-storage-service" {
  metadata {
    name      = "vm-storage-services"
    namespace = "default"
    labels    = {
          "k8s-app"                    = "vm-storage"
          "qcloud-app"                 = "vm-storage"
        }
    annotations = {
      "description"                                                 = "headless service for vm-storage"
      "service.kubernetes.io/qcloud-loadbalancer-clusterid"         = "cls-xxxxxx"
      "service.kubernetes.io/qcloud-loadbalancer-internal-subnetid" = "subnet-xxxxxx"
    }
  }

  spec {
    port {
      name        = "8482-80-tcp"
      port        = "80"
      protocol    = "TCP"
      target_port = "8482"
    }
    selector                = {
          "k8s-app"                    = "vm-storage"   # 这里是绑定的POD
          "qcloud-app"                 = "vm-storage"
        }
    session_affinity        = "None"
    type                    = "LoadBalancer"
    external_traffic_policy = "Cluster"
  }
}

# 可以在执行完成后输出VIP
output "load_balancer_ip" {
  value = "${kubernetes_service.vm-storage-service.status.0.load_balancer.0.ingress.0.ip}"  # vm-storage-service 是上面创建的 service 的名字
}

# config-map的建立方法
# 可以把vip写入配置
resource "kubernetes_config_map" "ahfu-vm-storage-vip" {
  metadata {
    name      = "ahfu-vm-storage-vip"
    namespace = "default"
  }
  data = {
      "my.yaml" = "${kubernetes_service.vm-storage-service.status.0.load_balancer.0.ingress.0.ip}"
  }
}

P.S 能够直接引用output的值呢？代码中死活做不到（只有父module引用子module的情况），希望有研究明白的小伙伴给个例子。

此外，shell中可以这样引用 terraform apply后的output值：

terraform output   # apply后，查询所有的output变量
load-balancer-ip-ahfu = "9.xxx.196.21"

terraform output load-balancer-ip-ahfu   # 根据名字获取output的值
"9.xxx.196.21"

Have fun!