Terraform RDS Option group options are keeps re-applying the same changes with dynamic block - terraform-provider-aws

Question

I have a Terraform RDS Code, i am Using Dynamic Blocks with For each, when i do terraform plan the option group options are re-applying each time. Can some one please help me? i think it is a Bug,
Can someone please help me?
main.tf
resource "aws_db_option_group" "without_s3_integration" {
#count = "${var.enable_s3_integration == false ? 1 : 0}"
name = lower("${var.db_name}-${formatdate("YYYY-MM-DD-hhmm", timestamp())}-og")
option_group_description = format("Option group for %s", var.db_name)
engine_name = var.engine_name
major_engine_version = var.major_engine_version
option {
option_name = "Timezone"
option_settings {
name = "TIME_ZONE"
value = "US/Eastern"
}
}
dynamic "option" {
#for_each = var.option_group_add_sqlt == false ? [] : [var.option_group_add_sqlt]
for_each = range(var.option_group_add_sqlt == true ? 1 : 0)
content {
option_name = "SQLT"
option_settings {
name = "LICENSE_PACK"
value = "T"
}
}
}
variable.tf
variable "option_group_add_sqlt"{
description = "Add SQLT to option group"
type = bool
default = true
}
variable "option_group_add_utlmail"{
description = "Add utlmail to option group"
type = bool
default = true
}
variable "option_group_add_oem"{
description = "Add oem to option group"
type = bool
default = false
}
variable "enable_s3_integration"{
description = "Indicates if S3 integration should be turned on or not"
type = bool
default = true
}
terraform plan
# aws_db_option_group.without_s3_integration will be updated in-place
~ resource "aws_db_option_group" "without_s3_integration" {
id = "rajtest4-2021-05-13-1621-og"
name = "rajtest4-2021-05-13-1621-og"
tags = {
"Author" = "Effectual Terraform script"
"Date" = "2021-05-13T16:21:54Z"
}
# (4 unchanged attributes hidden)
- option {
- db_security_group_memberships = [] -> null
- option_name = "S3_INTEGRATION" -> null
- port = 0 -> null
- version = "1.0" -> null
- vpc_security_group_memberships = [] -> null
}
+ option {
+ db_security_group_memberships = []
+ option_name = "S3_INTEGRATION"
+ version = "1.0"
+ vpc_security_group_memberships = []
}
- option {
- db_security_group_memberships = [] -> null
- option_name = "SQLT" -> null
- port = 0 -> null
- version = "2018-07-25.v1" -> null
- vpc_security_group_memberships = [] -> null
- option_settings {
- name = "LICENSE_PACK" -> null
- value = "T" -> null
}
}
+ option {
+ db_security_group_memberships = []
+ option_name = "SQLT"
+ vpc_security_group_memberships = []
+ option_settings {
+ name = "LICENSE_PACK"
+ value = "T"
}
}
- option {
- db_security_group_memberships = [] -> null
- option_name = "Timezone" -> null
- port = 0 -> null
- vpc_security_group_memberships = [] -> null
- option_settings {
- name = "TIME_ZONE" -> null
- value = "US/Eastern" -> null
}
}
+ option {
+ db_security_group_memberships = []
+ option_name = "Timezone"
+ vpc_security_group_memberships = []
+ option_settings {
+ name = "TIME_ZONE"
+ value = "US/Eastern"
}
}
+ option {
+ db_security_group_memberships = []
+ option_name = "UTL_MAIL"
+ vpc_security_group_memberships = []
}
}
Plan: 0 to add, 2 to change, 0 to destroy.
i am not sure why it is deleting adding the options. When i do terraform plan after terraform apply. it should not do any changes rite since i did not add anything extra, why terraform is always adding the resources and deleting it? is there any way to prevent happening like this?

Answer 1

I had this issue today. Analyzing the plan, I can check that the only change was in the version field of the S3_INTEGRATION option
So, I update my code from this:
option {
option_name = "S3_INTEGRATION"
}
To this
option {
option_name = "S3_INTEGRATION"
version = "1.0"
}