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7.6. Creating Discovery Rules

As a method of automating the provisioning process for discovered hosts, Satellite provides a feature to create discovery rules. These rules define how discovered hosts automatically provision themselves, based on the assigned host group. For example, you can automatically provision hosts with a high CPU count as hypervisors. Likewise, you can provision hosts with large hard disks as storage servers.

NIC Considerations

Auto provisioning does not currently allow configuring NICs; all systems are being provisioned with the NIC configuration that was detected during discovery. However, you can set the NIC in the kickstart scriplet, using a script, or using configuration management at a later stage.

Procedure

To create a rule, complete the following steps:

  1. In the Satellite web UI, navigate to Configure > Discovery rules, and select Create Rule.
  2. In the Name field, enter a name for the rule.
  3. In the Search field, enter the rules to determine whether to provision a host. This field provides suggestions for values you enter and allows operators for multiple rules. For example: cpu_count > 8.
  4. From the Host Group list, select the host group to use as a template for this host.

  5. In the Hostname field, enter the pattern to determine host names for multiple hosts. This uses the same ERB syntax that provisioning templates use. The host name can use the @host attribute for host-specific values and the rand function for a random number. For more information about provisioning templates, see 「Provisioning Templates」.

    • myhost-<%= rand(99999) %>
    • abc-<%= @host.facts['bios_vendor'] %>-<%= rand(99999) %>
    • xyz-<%= @host.hostgroup.name %>
    • srv-<%= @host.discovery_rule.name %>

    • server-<%= @host.ip.gsub('.','-') + '-' + @host.hostgroup.subnet.name %>

      When creating host name patterns, ensure that the resulting host names are unique, do not start with numbers, and do not contain underscores or dots. A good approach is to use unique information provided by Facter, such as the MAC address, BIOS, or serial ID.

  6. In the Hosts limit field, enter the maximum number of hosts that you can provision with the rule. Enter 0 for unlimited.
  7. In the Priority field, enter a number to set the precedence the rule has over other rules. Rules with lower values have a higher priority.
  8. From the Enabled list, select whether you want to enable the rule.
  9. To set a different provisioning context for the rule, click the Organizations and Locations tabs and select the contexts you want to use.
  10. Click Submit to save your rule.

  11. Navigate to Hosts > Discovered Host and select one of the following two options:

    • From the Discovered hosts list on the right, select Auto-Provision to automatically provisions a single host.
    • On the upper right of the window, click Auto-Provision All to automatically provisions all hosts.

For CLI Users

Create the rule with the hammer discovery-rule create command: 

# hammer discovery-rule create --name "Hypervisor" \
--search "cpu_count  > 8" --hostgroup "My_Host_Group" \
--hostname "hypervisor-<%= rand(99999) %>" \
--hosts-limit 5 --priority 5 --enabled true
Copy to Clipboard Toggle word wrap

Automatically provision a host with the hammer discovery auto-provision command: 

# hammer discovery auto-provision --name "macabcdef123456"
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