A scanner file is a plain text file that is used to simulate the discovery of a system that is unreachable, or one that you are not permitted to scan. You create a scanner file by running the standard discovery commands on a host and saving the output. Only the standard discovery commands are run on the host; information that is discovered by patterns is not available.
Scanning Windows targets
For Windows targets, you cannot download discovery commands. To discover Windows targets, you must use the Standalone Windows scanning tool.
Scanner files and clusters
Clusters do not support scanner files directly. To get information from a scanner file into a cluster, you must use the scanner file with a standalone machine that consolidates to a cluster.
The following topics are covered in this section:
Process for using scanner files
- Download the *.sh file from the BMC Discovery user interface.
- Copy the file to the remote host.
- Run and capture the output to a file.
- Using the SCP utility, upload the results file to the appliance as the upload user.
Creating a scanner file
- From the main menu, click the Administration Settings icon.
The Administration page opens.
- In the Discovery section, click Platforms.
- Click the OS link that corresponds to the host for which you are creating the scanning file.
The commands for the OS are displayed. The following example illustrates creating a scanner file using the Linux OS.
- Click the Download host script link, in this example, linux.sh, highlighted, and save the file to the local computer as an executable.
Copy the file to the remote host.
In the following example, the SCP utility is used to copy the files between the local host
teaspoonand the remote host
Log on to the remote host and run the script, piping the output into a text file:
Copy the output text file to your local host.
The output file is copied to your local host.
Loading the scanner file onto the appliance
After you have created and copied the output file to your local host, you can copy it to the appliance. In this example, the appliance is called
appliance, and the local host is called
teaspoon. When loading scanner files onto the appliance, use the upload user, because it has a home directory that is the default location (
/usr/tideway/var/scanner) for uploading scanner files, and it has limited access to the appliance. For information about enabling this user, see The upload user.
To load the scanner file onto the appliance
Ensure that the file has the group read permission set:
Copy the output file to the appliance.
In this example, the SCP utility is used:
When you load a scanner file onto the appliance, its name must be unique; otherwise, it might get overwritten by another scanner file being uploaded at the same time. For this reason, it is helpful to use a naming scheme that enables you to correlate scanner files and created hosts. Do not use a name that starts with a period (
.) or ends with
.ignore. If you do, that file will be ignored. File names are used only for internal purposes.
Using scanner files with consolidating appliances
If you are using scanner files with consolidating appliances, upload the scanner files to the consolidating appliance, rather than to the scanning appliance. Doing so correctly identifies the hosts as "Read from scanner file," rather than as "Retrieved by scanning appliance."
After a scanner file is loaded, you can look at the results of the discovery and view the host, as shown in the following illustration.
On the DiscoveryAccess page, in the Data Source field of the Discovery Details section, "Read from scanner file" is displayed, as shown in the following illustration.
Considerations when using scanner files
BMC Discovery automatically initiates a scan of the IP address. You do not need to initiate a scan manually. However, depending on how you set the Scanner File Polling Interval option, it can take up to an hour after the file is copied to the appliance for the scan to initiate. Scanner files are read periodically from the $TIDEWAY/var/scanner directory based on this setting. For more information about setting this option, see Scanning settings.
When scanner files are used, BMC Discovery creates nonexpiring pool data by creating a
.no-expiry file in the pool data directory $TIDEWAY/var/pool/192/168/1/100/.no-expiry, where the IP address is
192.168.1.100). The pool data is always used for each subsequent discovery and returns identical results until the scanner file is updated or the pool data is deleted.
- Hosts discovered by scanner files never age.
- BMC Discovery does not handle overlapping IP address ranges, which occur in rare cases. Using the Windows scanning tool might increase the likelihood of ranges overlapping. However, the tool enables you to select a specific IP address to avoid one you have already selected. For more information, see Standalone Windows scanning tool.
From the main menu, click the Administration Settings icon.