Add datadog socket path

Author: DimmKirr

main.tf

@@ -16,7 +16,10 @@ locals {
 
       // https://www.datadoghq.com/blog/monitor-aws-fargate/
       ECS_FARGATE = var.ecs_launch_type == "FARGATE" ? "true" : "false"
-    }
+    },
+    (var.ecs_launch_type == "EC2" && var.socket_apm_enabled_on_ec2) ? {
+      DD_APM_RECEIVER_SOCKET = "/var/run/datadog.sock"
+    } : {}
   )
 
   container_definition = {
@@ -46,7 +49,14 @@ locals {
         sourceVolume  = "proc"
         // This is disabled temporarily to overcome json unmarshaling issue
         //        readOnly = true
-      }
+      },
+
+      var.socket_apm_enabled_on_ec2 ? {
+        containerPath = "/var/run/datadog.sock"
+        sourceVolume  = "datadog_sock"
+        // This is disabled temporarily to overcome json unmarshaling issue
+        //        readOnly = true
+      } : {}
     ]
 
 
@@ -82,6 +92,15 @@ locals {
     {
       name      = "cgroup"
       host_path = "/cgroup/"
+    },
+    {
+      name      = "datadog_sock"
+      host_path = "/var/run/datadog.sock"
+      mount_point = {
+        "sourceVolume"  = "datadog_sock"
+        "containerPath" = "/var/run/datadog.sock"
+        "readOnly"      = null
+      }
     }
   ]
 

variables.tf

@@ -11,12 +11,12 @@ variable "app_name" {
 
 
 variable "environment" {
-  type = map(string)
+  type    = map(string)
   default = {}
 }
 
 variable "secret_names" {
-  type = list(string)
+  type    = list(string)
   default = []
 }
 
@@ -25,12 +25,12 @@ variable "secret_names" {
 //}
 
 variable "docker_image_name" {
-  type = string
+  type    = string
   default = "datadog/agent"
 }
 
 variable "docker_image_tag" {
-  type = string
+  type    = string
   default = "latest"
 }
 
@@ -46,6 +46,10 @@ variable "resource_requirements" {
   default = []
 }
 
+variable "socket_apm_enabled_on_ec2" {
+  default = true
+}
+
 variable "enabled" {
   default = true
 }