Postgresql reload

chef/cookbooks/postgresql/recipes/server.rb

@@ -98,14 +98,57 @@
 
 change_notify = node["postgresql"]["server"]["config_change_notify"]
 
+raw_configuration = node["postgresql"]["config"]
+postgresql_configuration = {}
+raw_configuration.each do |key, value|
+  next if value.nil?
+  formatted_value = case value
+  when String
+    "'#{value}'"
+  when TrueClass
+    "on"
+  when FalseClass
+    "off"
+  else
+    value
+  end
+  postgresql_configuration[key] = formatted_value
+end
+
+reloadable_parameters = [
+  "log_line_prefix"
+]
+
+config_needs_restart = postgresql_configuration.reject do |key, value|
+  reloadable_parameters.include? key
+end
+
+config_needs_reload = postgresql_configuration.select do |key, value|
+  reloadable_parameters.include? key
+end
+
 template "#{node['postgresql']['dir']}/postgresql.conf" do
   source "postgresql.conf.erb"
   owner "postgres"
   group "postgres"
   mode 0600
+  variables(
+    config: config_needs_restart.sort
+  )
   notifies change_notify, "service[postgresql]", :immediately
 end
 
+template "#{node['postgresql']['dir']}/postgresql_reloadable.conf" do
+  source "postgresql_reloadable.conf.erb"
+  owner "postgres"
+  group "postgres"
+  mode "0600"
+  variables(
+    config: config_needs_reload.sort
+  )
+  notifies :run, "bash[reload-postgresql-configuration]", :immediately
+end
+
 template "#{node['postgresql']['dir']}/pg_hba.conf" do
   source "pg_hba.conf.erb"
   owner "postgres"
@@ -164,3 +207,16 @@
   only_if only_if_command if ha_enabled
   action :run
 end
+
+# Reload the configuration file
+# We use the SQL interface for that. This way it will work
+# in clustered mode as well, no matter which node runs it
+# first
+bash "reload-postgresql-configuration" do
+  user "postgres"
+  code <<-EOH
+    echo "SELECT pg_reload_conf();" | psql
+  EOH
+  action :nothing
+end
+

chef/cookbooks/postgresql/templates/default/postgresql.conf.erb

@@ -3,18 +3,8 @@
 # Please refer to the PostgreSQL documentation for details on
 # configuration settings.
 
-<% node['postgresql']['config'].sort.each do |key, value| %>
-<% next if value.nil? -%>
-<%= key %> = <%=
-  case value
-  when String
-    "'#{value}'"
-  when TrueClass
-    'on'
-  when FalseClass
-    'off'
-  else
-    value
-  end
-%>
+include 'postgresql_reloadable.conf'
+
+<% @config.each do |key, value| %>
+<%= key %> = <%= value %>
 <% end %>

chef/cookbooks/postgresql/templates/default/postgresql_reloadable.conf.erb

@@ -0,0 +1,3 @@
+<% @config.each do |key, value| %>
+<%= key %> = <%= value %>
+<% end %>