diff --git a/manifests/init.pp b/manifests/init.pp
index c4f020343..9897d9819 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -73,30 +73,25 @@
 #  }
 #
 class grafana (
-  $archive_source      = $::grafana::params::archive_source,
-  $cfg_location        = $::grafana::params::cfg_location,
-  $cfg                 = $::grafana::params::cfg,
-  $ldap_cfg            = $::grafana::params::ldap_cfg,
-  $container_cfg       = $::grafana::params::container_cfg,
-  $container_params    = $::grafana::params::container_params,
-  $data_dir            = $::grafana::params::data_dir,
-  $install_dir         = $::grafana::params::install_dir,
-  $install_method      = $::grafana::params::install_method,
-  $manage_package_repo = $::grafana::params::manage_package_repo,
-  $package_name        = $::grafana::params::package_name,
-  $package_source      = $::grafana::params::package_source,
-  $repo_name           = $::grafana::params::repo_name,
-  $rpm_iteration       = $::grafana::params::rpm_iteration,
-  $service_name        = $::grafana::params::service_name,
-  $version             = $::grafana::params::version,
-  $plugins             = {}
+  Optional[String] $archive_source     = undef,
+  String $cfg_location                 = $::grafana::params::cfg_location,
+  Hash $cfg                            = $::grafana::params::cfg,
+  Optional[Hash] $ldap_cfg             = undef,
+  Boolean $container_cfg               = $::grafana::params::container_cfg,
+  Hash $container_params               = $::grafana::params::container_params,
+  String $data_dir                     = $::grafana::params::data_dir,
+  String $install_dir                  = $::grafana::params::install_dir,
+  String $install_method               = $::grafana::params::install_method,
+  Boolean $manage_package_repo         = $::grafana::params::manage_package_repo,
+  String $package_name                 = $::grafana::params::package_name,
+  Optional[String] $package_source     = undef,
+  Enum['stable', 'testing'] $repo_name = $::grafana::params::repo_name,
+  String $rpm_iteration                = $::grafana::params::rpm_iteration,
+  String $service_name                 = $::grafana::params::service_name,
+  String $version                      = $::grafana::params::version,
+  Hash $plugins                        = {}
 ) inherits grafana::params {
 
-  # validate parameters here
-  if !is_hash($cfg) {
-    fail('cfg parameter must be a hash')
-  }
-
   contain grafana::install
   contain grafana::config
   contain grafana::service
diff --git a/manifests/params.pp b/manifests/params.pp
index 4407a1c5e..54ef4a05b 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -4,7 +4,6 @@
 # It sets variables according to platform
 #
 class grafana::params {
-  $archive_source      = undef
   $cfg                 = {}
   $container_cfg       = false
   $container_params    = {}
@@ -12,9 +11,7 @@
   $docker_image        = 'grafana/grafana'
   $docker_ports        = '3000:3000'
   $install_dir         = '/usr/share/grafana'
-  $ldap_cfg            = false
   $package_name        = 'grafana'
-  $package_source      = undef
   $rpm_iteration       = '1'
   $repo_name           = 'stable'
   $version             = '4.5.1'
diff --git a/spec/classes/grafana_spec.rb b/spec/classes/grafana_spec.rb
index 29748bd79..b6fb7c29a 100644
--- a/spec/classes/grafana_spec.rb
+++ b/spec/classes/grafana_spec.rb
@@ -225,16 +225,6 @@
 
       context 'invalid parameters' do
         context 'cfg' do
-          describe 'should raise an error when cfg parameter is not a hash' do
-            let(:params) do
-              {
-                cfg: []
-              }
-            end
-
-            it { expect { is_expected.to contain_package('grafana') }.to raise_error(Puppet::Error, %r{cfg parameter must be a hash}) }
-          end
-
           describe 'should not raise an error when cfg parameter is a hash' do
             let(:params) do
               {