diff --git a/nodes/postgres-4.json b/nodes/postgres-4.json
index 5e24da3..1f2352e 100644
--- a/nodes/postgres-4.json
+++ b/nodes/postgres-4.json
@@ -12,6 +12,7 @@
     "hostname": "postgres-4",
     "ipaddress": "192.168.122.3",
     "roles": [
+      "base",
       "kvm_guest",
       "postgresql_primary"
     ],
@@ -46,18 +47,18 @@
     "cloud": null,
     "chef_packages": {
       "chef": {
-        "version": "17.7.29",
-        "chef_root": "/opt/chef/embedded/lib/ruby/gems/3.0.0/gems/chef-17.7.29/lib",
+        "version": "18.3.0",
+        "chef_root": "/opt/chef/embedded/lib/ruby/gems/3.1.0/gems/chef-18.3.0/lib",
         "chef_effortless": null
       },
       "ohai": {
-        "version": "17.7.8",
-        "ohai_root": "/opt/chef/embedded/lib/ruby/gems/3.0.0/gems/ohai-17.7.8/lib/ohai"
+        "version": "18.1.4",
+        "ohai_root": "/opt/chef/embedded/lib/ruby/gems/3.1.0/gems/ohai-18.1.4/lib/ohai"
       }
     }
   },
   "run_list": [
-    "recipe[kosmos-base]",
+    "role[base]",
     "role[kvm_guest]",
     "role[postgresql_primary]"
   ]
diff --git a/site-cookbooks/kosmos_postgresql/resources/server.rb b/site-cookbooks/kosmos_postgresql/resources/server.rb
index 5d5fb1c..d5b38da 100644
--- a/site-cookbooks/kosmos_postgresql/resources/server.rb
+++ b/site-cookbooks/kosmos_postgresql/resources/server.rb
@@ -54,11 +54,11 @@ action :create do
     unix_socket_directories: "/var/run/postgresql",
     dynamic_shared_memory_type: "posix",
     timezone: "UTC", # default is GMT
-    listen_addresses: "0.0.0.0"
+    listen_addresses: "0.0.0.0",
+    promote_trigger_file: "#{postgresql_data_dir}/failover.trigger",
+    wal_keep_segments: 256
   }
 
-  additional_config[:promote_trigger_file] = "#{postgresql_data_dir}/failover.trigger"
-
   postgresql_server_conf "main" do
     version postgresql_version
     additional_config additional_config