Azure DB for PostgreSQL collation changes automatically.

[piotrgo]

Hi,

We've run into an issue with newly added Azure DB for Postgres. I am not sure whether it's just a misinformation in documentation, or an actual problem with Terraform implementing Azure DB.
DB's collation changes from en_US to en-US and Terraform want's to change it.

Terraform Version

0.10.5

Affected Resource(s)

azurerm_postgresql_database

Terraform Configuration Files

resource "azurerm_postgresql_database" "pgsql_db" {
  name                             = "${replace(var.pgsql_srv_name, "-", "_")}_db"
  resource_group_name = "${var.resource_group_name}"
  server_name                 = "${azurerm_postgresql_server.pgsql_srv.name}"
  charset                          = "${var.charset}"
  collation                        = "en_US"
}

Initial Plan Output

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  + module.pgsql-artifactory.azurerm_postgresql_database.pgsql_db
      id:                             <computed>
      charset:                        "UTF8"
      collation:                      "en_US"
      name:                           "dbname"
      resource_group_name:            "rgname"
      server_name:                    "srvname"

Plan: 1 to add, 0 to change, 0 to destroy.

------------------------------------------------------------------------

Apply runs without any problems, immediately after, another plan results with:

Terraform will perform the following actions:

-/+ module.pgsql-artifactory.azurerm_postgresql_database.pgsql_db (new resource required)
      id:                             "/subscriptions/ID" => <computed> (forces new resource)
      charset:                        "UTF8" => "UTF8"
      collation:                      "en-US" => "en_US" (forces new resource)
      name:                           "dbname" => "dbname"
      resource_group_name:"rgname" => "rgname"
      server_name:                "srvname" => "srvname"

Plan: 1 to add, 0 to change, 1 to destroy.

------------------------------------------------------------------------

Expected Behavior

DB should be created with specified collation as per PGSQL documentation (underscore in collation type) and no further changes should be planned by Terraform

Actual Behavior

DB is being created fine, but on subsequent plan it is being marked for a change from en_US to en-US

Steps to Reproduce

Follow an example from the documentation for setting up Azure DB for PostgreSQL and Azure PostgreSQL DB with collation type set as per PGSQL documentation.

[tombuildsstuff]

Hey @piotrgo

Thanks for opening this issue :)

In the example you've provided above, we're submitting the value en_US through to Azure and then getting en-US back - out of interest do you see the same issue when using the value en-US for Collation? Taking a look at our test suite - we're making use of the collation English_United States.1252 - as such I'd suggest this is a documentation issue

Thanks

[piotrgo]

I've run a test, and it behaves as expected when I specify en-US from the start. I did some searching, and Microsoft uses different notation that uses a hyphen instead of underscore.

Do you think it's worth updating the docs in #418?

Cheers

[tombuildsstuff]

@piotrgo that's good to hear, thanks for looking into this further - it's definitely worth updating the docs via #418 and I'll close this issue now that's merged. Thanks!

[ghost]

When en-US is used now, Azure fails the deployment due to an invalid collation. Using en_US works, but it means that Terraform sees a change and deploys the PGSQL infrastructure on every run, destroying any existing data :(

[katbyte]

Hey @piotrgo,

Just wanted to let you know we have released v1.6.0 of the provider hopefully fixing this issue 🙂

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!