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04-variables-local-exec/README.md

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+%title: Terraform
+%author: Hubert
+
+# Terraform : Variables et Local-Exec
+
+<br>
+
+* utilisation de provisioner sur ces resources (passer des commandes)
+	> provisioner remote-exec : exécution sur la machine distante
+	> provisioner local-exec : exécution sur la machine terraform
+
+<br>
+
+* type de variables :
+	* string
+	* list
+  * map
+
+<br>
+
+exemple string :
+```
+variable "str" {
+  type = string
+  default = "127.0.0.1 gitlab.test"
+}
+resource "null_resource" "node1" {
+ provisioner "local-exec" {
+  command = "echo '${var.str}' > hosts.txt"
+ }
+}
+```
+
+----------------------------------------------------------------------------
+
+# Terraform : Variables et Local-Exec
+
+<br>
+
+* map
+```
+variable "hosts" {
+  default     = {
+    "127.0.0.1" = "localhost"
+    "10.0.4.52" = "git.tips-of-mine.local"
+    "10.0.4.105" = "prometheus.tips-of-mine.local"
+  }
+}
+resource "null_resource" "hosts" {
+ for_each = var.hosts
+ provisioner "local-exec" {
+  command = "echo '${each.key} ${each.value}' >> hosts.txt"
+ }
+}
+```
+
+<br>
+
+* trigger
+```
+resource "null_resource" "hosts" {
+ for_each = var.hosts
+ triggers = {
+   foo = each.value
+ }
+...
+```
+
+Remarque : boucle for préférable
+
+----------------------------------------------------------------------------
+
+# Terraform : Variables et Local-Exec
+
+<br>
+
+* parcourir une liste
+```
+variable "hosts" {
+  default     = ["127.0.0.1 localhost","10.0.4.133 gitlab.test"]
+}
+resource "null_resource" "hosts" {
+ count = "${length(var.hosts)}"
+ provisioner "local-exec" {
+  command = "echo '${element(var.hosts, count.index)}' >> hosts.txt"
+ }
+}
+```
+
+<br>
+
+* avec le trigger
+```
+variable "hosts" {
+  default     = ["11","2","3"]
+}
+resource "null_resource" "hosts" {
+ count = "${length(var.hosts)}"
+ triggers = {
+   foo = element(var.hosts, count.index)
+ }
+ provisioner "local-exec" {
+  command = "echo '${element(var.hosts, count.index)}' >> hosts.txt"
+ }
+}
+```