Terraform meta-argument: depends on
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- Terraform:
depends_onfor modules (https://github.com/hashicorp/terraform/blob/v0.13/CHANGELOG.md), Terraform 0.13.0 (Aug 2020)
Contents
Official example
resource "aws_iam_role" "example" {
name = "example"
# assume_role_policy is omitted for brevity in this example. Refer to the
# documentation for aws_iam_role for a complete example.
assume_role_policy = "..."
}
resource "aws_iam_instance_profile" "example" {
# Because this expression refers to the role, Terraform can infer
# automatically that the role must be created first.
role = aws_iam_role.example.name
}
resource "aws_iam_role_policy" "example" {
name = "example"
role = aws_iam_role.example.name
policy = jsonencode({
"Statement" = [{
# This policy allows software running on the EC2 instance to
# access the S3 API.
"Action" = "s3:*",
"Effect" = "Allow",
}],
})
}
resource "aws_instance" "example" {
ami = "ami-a1b2c3d4"
instance_type = "t2.micro"
# Terraform can infer from this that the instance profile must
# be created before the EC2 instance.
iam_instance_profile = aws_iam_instance_profile.example
# However, if software running in this EC2 instance needs access
# to the S3 API in order to boot properly, there is also a "hidden"
# dependency on the aws_iam_role_policy that Terraform cannot
# automatically infer, so it must be declared explicitly:
depends_on = [
aws_iam_role_policy.example
]
}
Errors
Related
- Terraform conditional expressions and
count - Terraform: output
- Terraform:
aws_ecs_task_definition - Docker compose file:
docker-compose.yml
See also
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