mirror of
https://github.com/sidpalas/devops-directive-terraform-course.git
synced 2025-12-10 12:51:14 +00:00
9949d314f3
- Remove minor version pin for postgres versions (i.e. 12.5 -> 12) - Update s3 config to use separate versioning and encryption terraform resources - Use bucket_prefix instead of bucket for bucket naming to avoid name conflicts Stream: https://youtu.be/KWwKPYuOGBw
Variables
Variable block
must define variable block
variable "var_name" {
type = string
}
Variable types
- string
- number
- bool
- list()
- set()
- map()
- object({ = , ... })
- tuple([, ...])
Variable files
variables.tfvars (or <FILENAME>.auto.tfvars) automatically applied
Apply default
terraform apply
Apply a different variable file
terraform apply -var-file=another-variable-file.tfvars
Passing Variable via Prompt
If value not specified, Terraform will prompt for value. (this is okay for testing... but don't depend on it since you should be automating things!)
var.db_pass
password for database
Enter a value:
Passing Variables via CLI
terraform apply -var="db_pass=$DB_PASS_ENV_VAR"
Local Variables
Allows you to store the value of expression for reuse but doesn't allow for passing in values
locals {
extra_tag = "extra-tag"
}
Output Variables
Allows you to output some value (which might not be known ahead of time).
For example it might be useful to know the IP address of a VM that was created:
output "instance_ip_addr" {
value = aws_instance.instance.private_ip
}
Sample output:
db_instance_addr = "terraform-20210504182745335900000001.cr2ub9wmsmpg.us-east-1.rds.amazonaws.com"
instance_ip_addr = "172.31.24.95"
Will be output after terraform apply or terraform output