Terraform: data source aws_instance doesn't work - amazon-web-services

Question

I'm trying to work with aws_instance data source. I created a simple configuration which should create an ec2 instance and should return ip as output
variable "default_port" {
type = string
default = 8080
}
provider "aws" {
region = "us-west-2"
shared_credentials_file = "/Users/kharandziuk/.aws/creds"
profile = "prototyper"
}
resource "aws_instance" "example" {
ami = "ami-0994c095691a46fb5"
instance_type = "t2.small"
tags = {
name = "example"
}
}
data "aws_instances" "test" {
instance_tags = {
name = "example"
}
instance_state_names = ["pending", "running", "shutting-down", "terminated", "stopping", "stopped"]
}
output "ip" {
value = data.aws_instances.test.public_ips
}
but for some reasons I can't configure data source properly. The result is:
> terraform plan
Refreshing Terraform state in-memory prior to plan...
The refreshed state will be used to calculate this plan, but will not be
persisted to local or remote state storage.
data.aws_instances.test: Refreshing state...
Error: Your query returned no results. Please change your search criteria and try again.
on main.tf line 21, in data "aws_instances" "test":
21: data "aws_instances" "test" {
how can I fix it?

Answer 1

You should use depends_on option into data.aws_instances.test.
like :
data "aws_instances" "test" {
instance_tags = {
name = "example"
}
instance_state_names = ["pending", "running", "shutting-down", "terminated", "stopping", "stopped"]
depends_on = [
"aws_instance.example"
]
}
It means that build data.aws_instances.test after make resource.aws_instance.example.
Sometimes, We need to use this option. Because of dependencies of aws resources.
See :
Here's a document about depends_on option.

Answer 2

You don't need a data source here. You can get the public IP address of the instance back from the resource itself, simplifying everything.
This should do the exact same thing:
resource "aws_instance" "example" {
ami = "ami-0994c095691a46fb5"
instance_type = "t2.small"
tags = {
name = "example"
}
}
output "ip" {
value = aws_instance.example.public_ip
}