Google Redis Instance (google_redis_instance, Memorystore) is always destroyed and re-created

[tsadoklevi]

Terraform Version

Terraform v0.11.7

• provider.google v1.15.0
• provider.random v1.3.1

Affected Resource(s)

• google_redis_instance

Terraform Configuration Files

resource "google_redis_instance" "redis" {
    depends_on          = ["google_compute_network.network"]

    name                = "${var.env_name}-redis"
    display_name        = "${var.env_name}-redis: created by Terraform"

    tier                = "STANDARD_HA"
    memory_size_gb      = 1

    authorized_network  = "${google_compute_network.network.name}"
    # authorized_network  = "${var.network_name}"

    region              = "${var.region}"
    location_id             = "europe-west1-b"
    alternative_location_id = "europe-west1-c"

    redis_version       = "REDIS_3_2"
}

Debug Output

google_redis_instance.redis (new resource required)
      id:                      "XXXXXXX/europe-west1/staging-redis" => <computed> (forces new resource)
      alternative_location_id: "europe-west1-c" => "europe-west1-c"
      authorized_network:      "projects/[PROJECT_NAME]/global/networks/staging" => "staging" (forces new resource)

      create_time:             "2018-07-10T06:53:49.730848Z" => <computed>
      current_location_id:     "europe-west1-b" => <computed>
      display_name:            "staging-redis: created by Terraform" => "staging-redis: created by Terraform"

      host:                    "10.0.0.4" => <computed>
      location_id:             "europe-west1-b" => "europe-west1-b"
      memory_size_gb:          "1" => "1"
      name:                    "staging-redis" => "staging-redis"
      port:                    "6379" => <computed>
      project:                 "XXXXXXXXXX" => <computed>
      redis_version:           "REDIS_3_2" => "REDIS_3_2"
      region:                  "europe-west1" => "europe-west1"
      reserved_ip_range:       "10.0.0.0/29" => <computed>
      tier:                    "STANDARD_HA" => "STANDARD_HA"

Expected Behavior

If redis resource configuration has not been changed, Terraform should not destroy the existing redis instance on GCP (Google Memorystore) and re-create it .

Actual Behavior

Terraform always destroys and re-createe redis instance on GCP.

[Chupaka]

Use authorized_network = "${google_compute_network.network.self_link}" instead of authorized_network = "${google_compute_network.network.name}"

[tsadoklevi]

@Chupaka thank you very much. It works. Would you please explain why? Is it the "recommended" way to refer to resources?

[Chupaka]

@tsadoklevi well, at least it will be added to the docs on the next release: https://github.com/terraform-providers/terraform-provider-google/blob/master/website/docs/r/redis_instance.html.markdown :)

Probably your case should be fixed, too. Let's wait for maintainers' comments.

[ghost]

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