diff --git a/README.md b/README.md
index 5aa0913..3b3f7ab 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,7 @@ Configuration
 * manage Nagios template definitions through external Puppet rules via define
 * manage Nagios main contacts through Puppet exports. Additional contacts can be created through external Puppet rules via define, to avoid having to alter the module code.
 * manage Nagios main contactgroups through Puppet exports. Additional contact groups can be created through external Puppet rules via define, to avoid having to alter the module code.
+* manage Nagios main hostgroups through Puppet exports. Additional host groups can be created through external Puppet rules via define, to avoid having to alter the module code.
 * configure NRPE on clients (optional)
 * configure firewall (optional)
 * configure selinux policies (optional)
diff --git a/manifests/nagios/objects/config.pp b/manifests/nagios/objects/config.pp
index e9a0922..82bf493 100644
--- a/manifests/nagios/objects/config.pp
+++ b/manifests/nagios/objects/config.pp
@@ -32,6 +32,7 @@ class cd_nagios::nagios::objects::config (
     require cd_nagios::nagios::objects::add_contact_rules
     require cd_nagios::nagios::objects::contactgroups
     require cd_nagios::nagios::objects::add_contactgroups_rules
+    require cd_nagios::nagios::objects::hostgroups
 
   }
 }
diff --git a/manifests/nagios/objects/hostgroups.pp b/manifests/nagios/objects/hostgroups.pp
new file mode 100644
index 0000000..4c99d31
--- /dev/null
+++ b/manifests/nagios/objects/hostgroups.pp
@@ -0,0 +1,228 @@
+## cd_nagios::nagios::objects::hostgroups.pp
+# Module name: cd_nagios
+# Author: Arne Teuke (arne_teuke@ConfDroid.com)
+# # License:
+#    This file is part of cd_nagios.
+#
+#    cd_nagios is used for providing automatic configuration of Nagios
+#    Copyright (C) 2016  ConfDroid (copyright@ConfDroid.com)
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# @summary  Class manages basic hostgroups known to NAGIOS through Puppet
+#   exports,  and populates /etc/nagios/conf.d/nagios_base_hostgroups.cfg.
+################################################################################
+class cd_nagios::nagios::objects::hostgroups (
+
+
+) inherits cd_nagios::params {
+
+  if $::fqdn == $ng_nagios_server {
+
+    # linux servers
+
+    @@nagios_hostgroup { 'linux-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'linux-servers',
+      alias           =>  'Linux Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+
+    # RHEL servers
+
+    @@nagios_hostgroup { 'rhel-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'rhel-servers',
+      alias           =>  'RHEL Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # CentOS servers
+
+    @@nagios_hostgroup { 'centos-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'centos-servers',
+      alias           =>  'CentOS Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # SuSE servers
+
+    @@nagios_hostgroup { 'suse-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'suse-servers',
+      alias           =>  'SuSE Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # Unix servers
+
+    @@nagios_hostgroup { 'unix-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'unix-servers',
+      alias           =>  'Unix Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # Solaris servers
+
+    @@nagios_hostgroup { 'solaris-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'solaris-servers',
+      alias           =>  'Solaris Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # AIX servers
+
+    @@nagios_hostgroup { 'aix-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'aix-servers',
+      alias           =>  'AIX Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # Windows servers
+
+    @@nagios_hostgroup { 'windows-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'windows-servers',
+      alias           =>  'Windows Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # Netware servers
+
+    @@nagios_hostgroup { 'netware-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'netware-servers',
+      alias           =>  'Netware Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # DB servers
+
+    @@nagios_hostgroup { 'db-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'db-servers',
+      alias           =>  'DB Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # Oracle servers
+
+    @@nagios_hostgroup { 'oracle-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'oracle-servers',
+      alias           =>  'Oracle Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # MySQL servers
+
+    @@nagios_hostgroup { 'mysql-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'mysql-servers',
+      alias           =>  'MySQL Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # MSSQL servers
+
+    @@nagios_hostgroup { 'mssql-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'mssql-servers',
+      alias           =>  'MSSQL Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # NOSQL servers
+
+    @@nagios_hostgroup { 'nosql-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'nosql-servers',
+      alias           =>  'NOSQL Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+    # Hadoop servers
+
+    @@nagios_hostgroup { 'hadoop-servers':
+      ensure          =>  present,
+      hostgroup_name  =>  'hadoop-servers',
+      alias           =>  'HADOOP Servers',
+      owner           =>  $ng_user,
+      group           =>  $ng_user,
+      mode            =>  '0640',
+      register        =>  '1',
+      target          =>  $ng_target_hostgroup,
+    }
+
+  }
+}
diff --git a/manifests/params.pp b/manifests/params.pp
index 1589b8a..c0396fd 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -965,7 +965,7 @@ $ng_templates_rule_erb    = 'cd_nagios/nagios/templates_cfg_rule.erb'
 $ng_target_timeperiods    = "${ng_conf_d_dir}/timeperiods.cfg"
 $ng_target_localhost      = "${ng_conf_d_dir}/nagios_localhost.cfg"
 $ng_target_host           = "${ng_conf_d_dir}/nagios_host.cfg"
-$ng_target_hostgroup      = "${ng_conf_d_dir}/nagios_hostgroup.cfg"
+$ng_target_hostgroup      = "${ng_conf_d_dir}/nagios_hostgroups_base.cfg"
 $ng_target_hostdep        = "${ng_conf_d_dir}/nagios_hostdependency.cfg"
 $ng_target_hostesc        = "${ng_conf_d_dir}/nagios_hostescalation.cfg"
 $ng_target_hostext        = "${ng_conf_d_dir}/nagios_hostextinfo.cfg"
@@ -979,7 +979,7 @@ $ng_tgt_contactgroup_base = "${ng_conf_d_dir}/nagios_contactgroup_base.cfg"
 $ng_tgt_contactgroup_add  = "${ng_conf_d_dir}/nagios_contactgroup_add.cfg"
 $ng_cntctgrps_head_erb    = 'cd_nagios/nagios/contactgroups_cfg_head.erb'
 $ng_cntctgrps_rule_erb    = 'cd_nagios/nagios/contactgroups_cfg_rule.erb'
-$ng_target_command        = "${ng_conf_d_dir}/nagios_command.cfg"
+$ng_target_command        = "${ng_conf_d_dir}/nagios_commands_base.cfg"
 
 
 # includes must be last
diff --git a/templates/nagios/contactgroups_cfg_rule.erb b/templates/nagios/contactgroups_cfg_rule.erb
index f4bbd98..a3c7d4c 100644
--- a/templates/nagios/contactgroups_cfg_rule.erb
+++ b/templates/nagios/contactgroups_cfg_rule.erb
@@ -1,3 +1,4 @@
+
 define contactgroup {
   contactgroup_name   <%= @ng_contactgroup_name %>
   alias               <%= @ng_contactgroup_alias %>
diff --git a/templates/nagios/contacts_cfg_rule.erb b/templates/nagios/contacts_cfg_rule.erb
index 6f103fa..356fa67 100644
--- a/templates/nagios/contacts_cfg_rule.erb
+++ b/templates/nagios/contacts_cfg_rule.erb
@@ -1,3 +1,4 @@
+
 define contact {
   contact_name  <%= @ng_contact_name %>
   use           <%= @ng_contact_use %>