Export Postgres metrics to Prometheus.

services/postgres.hcl

@@ -6,6 +6,9 @@ job "postgres" {
       port "db" {
         to = 5432
       }
+      port "exporter" {
+        to = 9187
+      }
     }
 
     task "postgres" {
@@ -18,7 +21,7 @@ job "postgres" {
       }
 
       env {
-        POSTGRES_PASSWORD = "Faelaishewohlees4nei"
+        POSTGRES_PASSWORD = "${var.pg_password}"
       }
 
       service {
@@ -37,5 +40,29 @@ job "postgres" {
         memory = 512
       }
     }
+
+    task "exporter" {
+      driver = "docker"
+
+      config {
+        image = "quay.io/prometheuscommunity/postgres-exporter"
+        ports = ["exporter"]
+      }
+
+      env {
+        DATA_SOURCE_NAME = "postgresql://postgres:${var.pg_password}@${NOMAD_ADDR_db}/postgres?sslmode=disable"
+      }
+
+      service {
+        name = "postgres-exporter"
+        port = "exporter"
+        tags = ["metrics"]
+      }
+    }
   }
 }
+
+variable "pg_password" {
+  type = string
+  default = "Faelaishewohlees4nei"
+}