add postgres job (#23)

Co-authored-by: James Hackett <jamesthackett1@gmail.com>

jobs/services/postgres.hcl

@@ -0,0 +1,96 @@
+job "postgres" {
+  datacenters = ["aperture"]
+
+  constraint {
+    attribute = "${attr.unique.hostname}"
+    value     = "wheatley"
+  }
+
+  group "db" {
+    network {
+      port "db" {
+        static = 5432
+      }
+    }
+
+    task "postgres-db" {
+      driver = "docker"
+
+      template {
+        data = <<EOH
+POSTGRES_PASSWORD="{{ key "postgres/password/root" }}"
+POSTGRES_USER="{{ key "postgres/username/root" }}"
+EOH
+
+        destination = "local/file.env"
+        env         = true
+      }
+
+      config {
+        image = "postgres:latest"
+        ports = ["db"]
+
+        volumes = [
+          "/opt/postgres:/var/lib/postgresql/data",
+          "local/postgresql.conf:/etc/postgres/postgresql.conf",
+          "local/pg_hba.conf:/pg_hba.conf",
+        ]
+      }
+
+      template {
+        data = <<EOH
+max_connections = 100
+shared_buffers = 2GB
+effective_cache_size = 6GB
+maintenance_work_mem = 512MB
+checkpoint_completion_target = 0.9
+wal_buffers = 16MB
+default_statistics_target = 100
+random_page_cost = 1.1
+effective_io_concurrency = 200
+work_mem = 5242kB
+min_wal_size = 1GB
+max_wal_size = 4GB
+max_worker_processes = 4
+max_parallel_workers_per_gather = 2
+max_parallel_workers = 4
+max_parallel_maintenance_workers = 2
+
+hba_file = "/pg_hba.conf"
+EOH
+
+        destination = "local/postgresql.conf"
+      }
+
+      template {
+        data = <<EOH
+local   all             all                                     trust
+host    all             all             127.0.0.1/32            trust
+host    all             all             ::1/128                 trust
+local   replication     all                                     trust
+host    replication     all             127.0.0.1/32            trust
+host    replication     all             ::1/128                 trust
+host 	all 		    all 		    all 			        scram-sha-256
+EOH
+
+        destination = "local/pg_hba.conf"
+      }
+
+      resources {
+        cpu    = 400
+        memory = 800
+      }
+
+      service {
+        name = "postgres"
+        port = "db"
+
+        check {
+          type     = "tcp"
+          interval = "2s"
+          timeout  = "2s"
+        }
+      }
+    }
+  }
+}