Menu
I have resources defined in .tf files that are generic to several applications. I populate many of the fields via a .tfvars file. I need to omit some of the resources entirely based on variables in the .tfvars.
For example if I have a resource like:
resource "cloudflare_record" "record" {
zone_id = "${data.cloudflare_zones.domain.zones[0].id}"
name = "${var.subdomain}"
value = "${var.origin_server}"
type = "CNAME"
ttl = 1
proxied = true
}
But then I declare something like cloudflare = false in my .tfvars file I'd like to be able to do something like this:
if var.cloudflare {
resource "cloudflare_record" "record" {
zone_id = "${data.cloudflare_zones.domain.zones[0].id}"
name = "${var.subdomain}"
value = "${var.origin_server}"
type = "CNAME"
ttl = 1
proxied = true
}
}
I've looked at dynamic blocks but that looks like you can only use those to edit fields and blocks within a resource. I need to be able to ignore an entire resource.
1000
You can use count block with Conditional Expressions (condition ? true_val : false_val) to create a resource based on variable value. description = "default condition value is true."
Terraform doesn't support if-statements, so this code won't work. However, you can accomplish the same thing by using the count parameter and taking advantage of two properties: If you set count to 1 on a resource, you get one copy of that resource; if you set count to 0, that resource is not created at all.
Using the -var Command-line Flag The -var flag is used to pass values for Input Variables to Terraform commands. This flag can be used with both of the Terraform plan and apply commands. The argument passed to the -var flag is a string surrounded by either single or double quotes.
Use the depends_on meta-argument to handle hidden resource or module dependencies that Terraform cannot automatically infer. You only need to explicitly specify a dependency when a resource or module relies on another resource's behavior but does not access any of that resource's data in its arguments.
Add a count parameter with a ternary conditional using the variable declared in .tfvars like this:
resource "cloudflare_record" "record" {
count = var.cloudflare ? 1 : 0
zone_id = "${data.cloudflare_zones.domain.zones[0].id}"
name = "${var.subdomain}"
value = "${var.origin_server}"
type = "CNAME"
ttl = 1
proxied = true
}
In this example var.cloudflare is a boolean declared in the .tfvars file. If it is true a count of 1 record will be created. If it is false a count of 0 record will be created.
After the count apply the resource becomes a group, so later in the reference use 0-index of the group:
cloudflare_record.record[0].some_field
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With