Add support for installing third party software on EC2 (#63)

* Add support for installing third party software on EC2 * Update the description of the variable nat_instance_user_data post_install Co-authored-by: Ben Whaley <[email protected]> * Update post install variable description in readme Co-authored-by: Ben Whaley <[email protected]> --------- Co-authored-by: Ben Whaley <[email protected]>
chime · Apr 27, 2023 · 7cc5597 · 7cc5597
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diff --git a/README.md b/README.md
@@ -181,6 +181,18 @@ module "alternat_instances" {
 }
 ```
 
+The `nat_instance_user_data_post_install` variable allows you to run an additional script to be executed after the main configuration has been installed.
+
+```hcl
+module "alternat_instances" {
+ ...
+ nat_instance_user_data_post_install = templatefile("${path.root}/post_install.tpl", {
+ VERSION_ENV = var.third_party_version
+ })
+ ...
+}
+```
+
 Feel free to submit a pull request or create an issue if you need an input or output that isn't available.
 
 #### Can I use my own NAT Gateways?

diff --git a/modules/terraform-aws-alternat/main.tf b/modules/terraform-aws-alternat/main.tf
@@ -185,6 +185,15 @@ data "cloudinit_config" "config" {
  content_type = "text/x-shellscript"
  content = file("${path.module}/../../scripts/alternat.sh")
  }
+
+ dynamic "part" {
+ for_each = var.nat_instance_user_data_post_install != "" ? [1] : []
+
+ content {
+ content_type = "text/x-shellscript"
+ content = var.nat_instance_user_data_post_install
+ }
+ }
 }
 
 resource "aws_launch_template" "nat_instance_template" {

diff --git a/modules/terraform-aws-alternat/variables.tf b/modules/terraform-aws-alternat/variables.tf
@@ -155,6 +155,12 @@ variable "nat_instance_eip_ids" {
  default = []
 }
 
+variable "nat_instance_user_data_post_install" {
+ description = "Post-install shell script to run at boot after configuring alternat."
+ type = string
+ default = ""
+}
+
 variable "tags" {
  description = "A map of tags to add to all supported resources managed by the module."
  type = map(string)