Chapter 6. Using Report Templates to Monitor Hosts

You can use report templates to query Satellite data to obtain information about, for example, host status, registered hosts, applicable errata, applied errata, subscription details, and user activity. You can use the report templates that ship with Satellite or write your own custom report templates to suit your requirements. The reporting engine uses the embedded Ruby (ERB) syntax. For more information about writing templates and ERB syntax, see Appendix A, Template Writing Reference.

You can create a template, or clone a template and edit the clone. For help with the template syntax, click a template and click the Help tab.

6.1. Generating Host Monitoring Reports

To view the report templates, in the Satellite web UI, navigate to Monitor > Report Templates.

To schedule reports, you can configure a cron job or use the Satellite web UI.

Procedure

  1. In the Satellite web UI, navigate to Monitor > Report Templates.
  2. To the right of the report template that you want to use, click Generate.
  3. Optional: To schedule a report, to the right of the Generate at field, click the icon to select the date and time you want to generate the report at.
  4. Optional: To send a report to an e-mail address, select the Send report via e-mail check box, and in the Deliver to e-mail addresses field, enter the required e-mail address.
  5. Optional: Apply search query filters. To view all available results, do not populate the filter field with any values.
  6. Click Submit. A CSV file that contains the report is downloaded. If you have selected the Send report via e-mail check box, the host monitoring report is sent to your e-mail address.

For CLI Users

To generate a report, complete the following steps:

  1. List all available report templates:

    # hammer report-template list
  2. Generate a report:

    # hammer report-template generate --id template ID

    This command waits until the report fully generates before completing. If you want to generate the report as a background task, you can use the hammer report-template schedule command.

6.2. Creating a Report Template

In Satellite, you can create a report template and customize the template to suit your requirements. You can import existing report templates and further customize them with snippets and template macros.

Report templates use Embedded Ruby (ERB) syntax. To view information about working with ERB syntax and macros, in the Satellite web UI, navigate to Monitor > Report Templates, and click Create Template, and then click the Help tab.

When you create a report template in Satellite, safe mode is enabled by default. For more information about safe mode, see Section 6.7, “Report Template Safe Mode”.

For more information about writing templates, see the Appendix A, Template Writing Reference.

For more information about macros you can use in report templates, see Section A.4, “Templates Macros”.

Procedure

  1. In the Satellite web UI, navigate to Monitor > Report Templates, and click Create Template.
  2. In the Name field, enter a unique name for your report template.
  3. If you want the template to be available to all locations and organizations, select Default.
  4. Create the template directly in the template editor or import a template from a text file by clicking Import. For more information about importing templates, see Section 6.5, “Importing Report Templates”.
  5. Optional: In the Audit Comment field, you can add any useful information about this template.
  6. Click the Input tab, and in the Name field, enter a name for the input that you can reference in the template in the following format: input('name'). Note that you must save the template before you can reference this input value in the template body.
  7. Select whether the input value is mandatory. If the input value is mandatory, select the Required check box.
  8. From the Value Type list, select the type of input value that the user must input.
  9. Optional: If you want to use facts for template input, select the Advanced check box.
  10. Optional: In the Options field, define the options that the user can select from. If this field remains undefined, the users receive a free-text field in which they can enter the value they want.
  11. Optional: In the Default field, enter a value, for example, a host name, that you want to set as the default template input.
  12. Optional: In the Description field, you can enter information that you want to display as inline help about the input when you generate the report.
  13. Optional: Click the Type tab, and select whether this template is a snippet to be included in other templates,
  14. Click the Location tab and add the locations where you want to use the template.
  15. Click the Organizations tab and add the organizations where you want to use the template.
  16. Click Submit to save your changes.

6.3. Exporting Report Templates

You can export report templates that you create in Satellite.

Procedure

  1. In the Satellite web UI, navigate to Monitor > Report Templates.
  2. Locate the template that you want to export, and from the list in the Actions column, select Export.
  3. Repeat this action for every report template that you want to download.

An .erb file that contains the template downloads.

For CLI Users

  1. To view the report templates available for export, enter the following command:

    # hammer report-template list

    Note the template ID of the template that you want to export in the output of this command.

  2. To export a report template, enter the following command:

    # hammer report-template dump --id template_ID > example_export.erb

6.4. Exporting Report Templates Using the Satellite API

You can use the Satellite report_templates API to export report templates from Satellite. For more information about using the Satellite API, see the API Guide.

Procedure

  1. Use the following request to retrieve a list of available report templates:

    Example request:

    $ curl --insecure --user admin:redhat \
    --request GET \
    --config https://satellite.example.com/api/report_templates \
    | json_reformat

    In this example, the json_reformat tool is used to format the JSON output.

    Example response:

    {
        "total": 6,
        "subtotal": 6,
        "page": 1,
        "per_page": 20,
        "search": null,
        "sort": {
            "by": null,
            "order": null
        },
        "results": [
            {
                "created_at": "2019-11-20 17:49:52 UTC",
                "updated_at": "2019-11-20 17:49:52 UTC",
                "name": "Applicable errata",
                "id": 112
            },
            {
                "created_at": "2019-11-20 17:49:52 UTC",
                "updated_at": "2019-11-20 17:49:52 UTC",
                "name": "Applied Errata",
                "id": 113
            },
            {
                "created_at": "2019-11-30 16:15:24 UTC",
                "updated_at": "2019-11-30 16:15:24 UTC",
                "name": "Hosts - complete list",
                "id": 158
            },
            {
                "created_at": "2019-11-20 17:49:52 UTC",
                "updated_at": "2019-11-20 17:49:52 UTC",
                "name": "Host statuses",
                "id": 114
            },
            {
                "created_at": "2019-11-20 17:49:52 UTC",
                "updated_at": "2019-11-20 17:49:52 UTC",
                "name": "Registered hosts",
                "id": 115
            },
            {
                "created_at": "2019-11-20 17:49:52 UTC",
                "updated_at": "2019-11-20 17:49:52 UTC",
                "name": "Subscriptions",
                "id": 116
            }
        ]
    }

  2. Note the id of the template that you want to export, and use the following request to export the template:

    Example request:

    $ curl --insecure --output /tmp/_Example_Export_Template.erb_ \
    --user admin:password --request GET --config \
    https://satellite.example.com/api/report_templates/158/export

    Note that 158 is an example ID of the template to export.

    In this example, the exported template is redirected to host_complete_list.erb.

6.5. Importing Report Templates

You can import a report template into the body of a new template that you want to create. Note that using the web UI, you can only import templates individually. For bulk actions, use the Satellite API. For more information, see Section 6.6, “Importing Report Templates Using the Satellite API”.

Prerequisite

Procedure

  1. In the Satellite web UI, navigate to Monitor > Report Templates, and in the upper right of the Report Templates window, click Create Template.
  2. In the Template area, click Import, and select the .erb file that you want to import.
  3. Edit the template to suit your requirements, and click Submit.

For more information about customizing your new template, see Appendix A, Template Writing Reference.

6.6. Importing Report Templates Using the Satellite API

You can use the Satellite API to import report templates into Satellite. Importing report templates using the Satellite API automatically parses the report template metadata and assigns organizations and locations. For more information about using the Satellite API, see the API Guide.

Prerequisite

Procedure

  1. Use the following example to format the template that you want to import to a .json file:

    # cat Example_Template.json
    {
        "name": "Example Template Name",
        "template": "
        Enter ERB Code Here
    "
    }

    Example JSON File with ERB Template:

    {
        "name": "Hosts - complete list",
        "template": "
    <%#
    name: Hosts - complete list
    snippet: false
    template_inputs:
    - name: host
      required: false
      input_type: user
      advanced: false
      value_type: plain
      resource_type: Katello::ActivationKey
    model: ReportTemplate
    -%>
    <% load_hosts(search: input('host')).each_record do |host| -%>
    <%
          report_row(
              'Server FQND': host.name
          )
    -%>
    <%  end -%>
    <%= report_render %>
    "
    }

  2. Use the following request to import the template:

    $ curl --insecure --user admin:redhat \
    --data @Example_Template.json --header "Content-Type:application/json" \
    --request POST --config https://satellite.example.com/api/report_templates/import
  3. Use the following request to retrieve a list of report templates and validate that you can view the template in Satellite:

    $ curl --insecure --user admin:redhat \
     --request GET --config https://satellite.example.com/api/report_templates | json_reformat

6.7. Report Template Safe Mode

When you create report templates in Satellite, safe mode is enabled by default. Safe mode limits the macros and variables that you can use in the report template. Safe mode prevents rendering problems and enforces best practices in report templates. The list of supported macros and variables is available in the Satellite web UI.

To view the macros and variables that are available, in the Satellite web UI, navigate to Monitor > Report Templates and click Create Template. In the Create Template window, click the Help tab and expand Safe mode methods.

While safe mode is enabled, if you try to use a macro or variable that is not listed in Safe mode methods, the template editor displays an error message.

To view the status of safe mode in Satellite, in the Satellite web UI, navigate to Administer > Settings and click the Provisioning tab. Locate the Safemode rendering row to check the value.