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January 18, 2022 05:40 pm GMT

How-to setup a HA/DR database in AWS? [9 - Generate a random value]

In this part (and the last part of the serie), we will see how to generate a random value.

Really useful to generate unique names for a snapshot for example, you will see that there are multiple definitions available, depending on what you need.

Random Id

resource "random_id" "rdm_id" {  byte_length = 8}

Declared as this, it will generate for you an 8 bytes long id which can be retrieve in :

  • base64 : random_id.rdm_id.id => MDc3NDA2OGE5YTNhMjc5MQ==
  • decimal digits : random_id.rdm_id.dec => 537061447926687633
  • hexadecimal digits : random_id.rdm_id.hex => 0774068a9a3a2791

But it you are doing it like this, the random_id will always be the same!

So to be sure the value change when something append, you can use the keepers parameter.

With this, you can say "if the parameter X and Y change, so the random value must change too".

In this example the random value will change each time the arn of the global cluster example will change.

resource "random_id" "rdm_id" {  byte_length = 8  keepers = {    first = aws_rds_global_cluster.example.arn  }}

And if you want this value to change each time the script is executed, use a timestamp :

resource "random_id" "rdm_id" {  byte_length = 8  keepers = {    first = timestamp()  }}

Other random possibilities

Following the same pattern, Terraform let you to generate random

  • integer
resource "random_integer" "priority" {  min = 1  max = 50000}
  • password
resource "random_password" "password" {  length           = 16  special          = true  override_special = "_%@"}
  • string
resource "random_string" "random" {  length           = 16  special          = true  override_special = "/@$"}
  • UUID
resource "random_uuid" "test" {}
  • A shuffled sublist
resource "random_shuffle" "az" {  input        = ["us-west-1a", "us-west-1c", "us-west-1d", "us-west-1e"]  result_count = 2}

Here you will retrieve a sublist of the input list, with only 2 items.

Links

I hope it will help you and you liked this serie!


Original Link: https://dev.to/adaendra/how-to-setup-a-hadr-database-in-aws-9-generate-a-random-value-5g8a

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