Ticket ID #220 ‐ Expand Nagios Monitoring with Puppet - GriffinKat/group-a GitHub Wiki

Creating Host Groups

Host groups allow us to group hosts that share common characteristics. For example, we can create a host group for all servers running SSH and another for the database server.

• Host group for SSH servers

  Write the following code in the config.pp file to create a host group for SSH servers.

  nagios_hostgroup { 'my-ssh-servers':
    target               => '/etc/nagios4/conf.d/ppt_hostgroups.cfg',
    alias                => 'My SSH Servers',
    mode                 => '0644',
    members              => 'db-a, apps-a, backup-a'
  }
  

• Host group for Database servers

  Write the following code in the config.pp file to create a host group for Database servers.

  nagios_hostgroup { 'my-db-servers':
    target               => '/etc/nagios4/conf.d/ppt_hostgroups.cfg',
    alias                => 'My Database Servers',
    mode                 => '0644',
    members              => 'db-a'
  }
  

Creating Services

We will define services that we want to monitor. Services represent specific functions or applications running on hosts. For example, we can define a service to monitor SSH or HTTP, or MySQL services. Write the following code in the config.pp file.

• Service to monitor SSH:

   nagios_service { "ssh":
        service_description => "SSH Servers",
        hostgroup_name => "my-ssh-servers",
        target => "/etc/nagios4/conf.d/ppt_services.cfg",
        check_command => "check_ssh",
        max_check_attempts => 3,
        retry_check_interval => 1,
        normal_check_interval => 5,
        check_period => "24x7",
        notification_interval => 30,
        notification_period => "24x7",
        notification_options => "w,u,c",
        contact_groups => "admins",
        mode => '0644'
  }
  

• Service to monitor MYSQL:

  nagios_service { "MySQL":
        service_description => "Database Servers",
        hostgroup_name => "my-db-servers",
        target => "/etc/nagios4/conf.d/ppt_services.cfg",
        check_command => "check_mysql",
        max_check_attempts => 3,
        retry_check_interval => 1,
        normal_check_interval => 5,
        check_period => "24x7",
        notification_interval => 30,
        notification_period => "24x7",
        notification_options => "w,u,c",
        contact_groups => "admins",
        mode => '0644'
  }
  

  Below is the screenshot of the config.pp file reflecting the above code.

  

Apply the module to the management server.

Use the following command to apply the module. sudo /opt/puppetlabs/bin/puppet agent --test

Verification

Below is the screenshot of the nagios web-interface showing the new hosts, hostgroups and services respectively.