Try to stabilize DNS

Add all cluster nodes to each nodes resolv.conf and update blocky config
template to delay render on update to avoid unnecessary restarts

ansible_playbooks/setup-cluster.yml

@@ -63,7 +63,8 @@
       lineinfile:
         dest: /etc/resolv.conf
         create: true
-        line: "nameserver {{ hostvars[inventory_hostname]['ansible_default_ipv4']['address'] }}"
+        line: "nameserver {{ hostvars[item].ansible_default_ipv4.address }}"
+      loop: "{{ ansible_play_hosts }}"
       become: true
 
 - name: Setup Vault cluster

core/blocky/blocky.nomad

@@ -129,6 +129,11 @@ job "blocky" {
         data = var.config_data
         destination = "app/config.yml"
         splay = "1m"
+
+        wait {
+          min = "10s"
+          max = "20s"
+        }
       }
     }