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Update ansible inventory file when template changes (#1612)

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This trigger ensures the inventory file is kept up-to-date. Otherwise, if the file exists and you've made changes to your terraform-managed infra without having deleted the file, it would never get updated. 

For example, consider the case where you've destroyed and re-applied the terraform resources, none of the IPs would get updated, so ansible would be trying to connect to the old ones.
This commit is contained in:
Yorgos Saslis 2017-09-05 14:10:53 +03:00 committed by Matthew Mosesohn
parent c77d11f1c7
commit 82eedbd622
1 changed files with 6 additions and 1 deletions
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7
contrib/terraform/aws/create-infrastructure.tf
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@ -162,7 +162,7 @@ resource "aws_instance" "k8s-worker" {
*/ */
data "template_file" "inventory" { data "template_file" "inventory" {
template = "${file("${path.module}/templates/inventory.tpl")}" template = "${file("${path.module}/templates/inventory.tpl")}"
vars { vars {
public_ip_address_bastion = "${join("\n",formatlist("bastion ansible_ssh_host=%s" , aws_instance.bastion-server.*.public_ip))}" public_ip_address_bastion = "${join("\n",formatlist("bastion ansible_ssh_host=%s" , aws_instance.bastion-server.*.public_ip))}"
connection_strings_master = "${join("\n",formatlist("%s ansible_ssh_host=%s",aws_instance.k8s-master.*.tags.Name, aws_instance.k8s-master.*.private_ip))}" connection_strings_master = "${join("\n",formatlist("%s ansible_ssh_host=%s",aws_instance.k8s-master.*.tags.Name, aws_instance.k8s-master.*.private_ip))}"
@ -176,6 +176,7 @@ data "template_file" "inventory" {
kube_insecure_apiserver_address = "kube_apiserver_insecure_bind_address: ${var.kube_insecure_apiserver_address}" kube_insecure_apiserver_address = "kube_apiserver_insecure_bind_address: ${var.kube_insecure_apiserver_address}"
} }
} }
resource "null_resource" "inventories" { resource "null_resource" "inventories" {
@ -183,4 +184,8 @@ resource "null_resource" "inventories" {
command = "echo '${data.template_file.inventory.rendered}' > ../../../inventory/hosts" command = "echo '${data.template_file.inventory.rendered}' > ../../../inventory/hosts"
} }
triggers {
template = "${data.template_file.inventory.rendered}"
}
} }