• How to use terraform's nonsensitive() function

  2 min read

  
  

  Starting terraform 0.15 variables can be marked as sensitive, so it won't appear in plain text as a terraform output unless we explicitly request them. But we can also make the variable as non sensitive using the nonsensitive() function

  07/10/2021

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• Loading a CSV file into terraform

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  Sometimes if you have some externally managed data it can come handy to be able to import it into terraform as a CSV file instead of having to manually enter all the date. To do so we can use the csvdecode() function

  10/08/2021

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• Using terraform try function to retrieve optional values on maps

  2 min read

  
  

  It's common practice to use a map in terraform to configure resources. If we want to use a map with optional values we can make use of the try() function

  Let's us the following map as an example:

    config = {
      namespaces = ["namespace1", "namespace2"]
  
      (...)
    }
  

  02/07/2021

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• terraform: Using for_each over tuples

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  Let's imagine we have the following data structure:

  locals {
    queries = [
      {
        query  = "SELECT version()"
        engine = "postgresql"
      },
      {
        query  = "SELECT * FROM v$version"
        engine = "oracle"
      },
      (...)
    ]
  }
  

  If we want to use just some of the items on a resource we can use for_each through the resulting array of filtering the objects using a for:

  for_each = [ for item in local.queries: item if item.engine == "postgresql" ]
  

  22/06/2021

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• terraform setproduct: combine list of objects to generate all the possible combinations

  4 min read

  
  

  Let's imagine we want to create a security group with the following ingress rules:

  ingress_rules = [
      {
          protocol = "tcp"
          cidr_blocks = [ "1.1.1.1/32", "2.2.2.2/32" ]
      },
      {
          protocol = "tcp"
          cidr_blocks = [ "1.2.3.4/32" ]
      }
  ]
  

  For each of the following ports:

  services = ["80", "443", "8080"]
  

  We can use the terraform function setproduct() to calculate all the combinations of elements from the given sets. That's also called the Cartesian product. For this example it's going to be 2x3.

  16/06/2021

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