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4.3. Discovering Resources

Before any application or platform can be managed by JBoss ON, it must be imported into the inventory. There are different ways of adding resources to the inventory, depending on how the resource was discovered.

4.3.1. Finding New Resources: Discovery
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When an agent is installed and every time it starts up, it scans the platform, and all applications on it, for any servers, services, or other items which can be included into the inventory. The process of finding potential resources is called discovery.
There are different scans for each type of resource: platform, server, and service. High level scans for servers and platforms are initiated by the agent every 15 minutes. A service scan detects lower-level services that are running in servers that have already been imported into the inventory. These scans run by default every 24 hours. Both of these intervals are configurable in the JBoss ON agent configuration. The agent always runs a scan for new resources when it starts up, and then periodically at its configured intervals. JBoss ON agents send information about the platform and servers it discovers back to the JBoss ON server.
A server must be imported into the inventory before any of its child processes, servers, or services can be detected by the discovery scan.
When a platform is imported into the inventory, several of its child servers and services are imported automatically as well. This includes resources that are vital to the platform (like CPU, network adapters, and filesystems) as well as resources that are used by the JBoss ON server itself (such as the Ant bundle handler resource, which is used by the provisioning subsystem).
Although discovery is run automatically by the agent, discovery can also be initiated manually to capture infrastructure changes immediately.

4.3.2. Running Discovery Scans Manually
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Discovery scans are run automatically by the agent to identify new resources as they are added to a platform. Server scans are run every 15 minutes and service scans every 24 hours. (Additionally, the agent runs a full discovery scan when it starts up.) New resources can be added between the discovery scans, so administrators can initiate a manual discovery scan apart from the scheduled discovery scan.
The simplest way to initiate a discovery scan is to run the agent's discovery command at the agent command prompt:
  1. Click the Inventory tab in the top menu.
  2. Open the Servers - Top Level Resources link on the left, and select the agent resource.
  3. Open the Operations tab for the agent.
  4. In the Schedules subtab, click the New button.
  5. Select the Manual Discovery operation from the drop-down menu, and select whether to run a detailed discovery (servers and services) or a simple discovery (servers only).
  6. In the Schedule area, select the radio button to run the operation immediately.
  7. Click the Schedule button to set up the operation.

4.3.3. Importing Resources from the Discovery Queue
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  1. Click the Inventory tab in the top menu.
  2. In the Resources menu on the left, select Discovery Queue.
  3. Select the checkbox of the resources to be imported. Selecting a parent resource (such as a platform) gives the option to automatically import all of its children, too.
  4. Click the Import button at the bottom of the UI.

4.3.4. Ignoring Discovered Resources
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When the JBoss ON agent discovers an application or service which is to be ignored from the inventory, the server can be instructed to ignore those resources in the discovery queue.

Note

A resource can only be ignored if its parent is already added to the inventory.
  1. Select Inventory from the top menu.
  2. Select the Discovery Queue item under the Resources menu on the left side of the screen.
  3. Select the checkbox of the resource to be ignored. Selecting a parent resource automatically selects all of its children.
  4. Click the Ignore button at the bottom of the page.

Note

It is not possible to ignore a platform. If a platform should not be in the inventory, do not run an agent on that machine.
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