Start using preemption

nomad/postgres-amd64.hcl

@@ -1,11 +1,7 @@
-job "dbx86" {
+job "postgres" {
   datacenters = ["dc1"]
   type = "system"
-
-  constraint {
-    attribute = "${attr.cpu.arch}"
-    value     = "amd64"
-  }
+  priority = 90
 
   update {
     max_parallel     = 1

nomad/seafile.hcl

@@ -39,7 +39,7 @@ job "seafile" {
       }
 
       resources {
-        memory = 2048
+        memory = 512
         network {
           port "seahub_port" {}
           port "seafhttp_port" {}