After a TMOS image file is uploaded to the /shared/images/ directory, the BIG-IP system's installation daemon, lind, automatically detects the new file. The lind process then performs a validation check to ensure the file is a legitimate and uncorrupted software image. This validation includes verifying the file's internal checksum and digital signature. Only after this integrity check is successfully completed will the image be considered valid and subsequently displayed in the list of available images in the Configuration utility (GUI) under System » Software Management » Image List.

A. The system performs a reboot into a new partition.

This is incorrect. A system reboot is part of the software installation process, which is manually initiated by the administrator after the image has been verified and selected from the GUI.

C. The system copies the image to /var/local/images/.

This is incorrect. The /shared/images/ directory is the designated and persistent location for software images. The system does not automatically copy the image to another directory as part of the verification process.

1. F5 Networks Knowledge Base, K13432: The BIG-IP system may not display a software image that was manually copied to the /shared/images directory.

Section/Paragraph: "Cause" and "Recommended Actions" sections.

Content: This document explicitly states, "The lind process is responsible for verifying software images and populating the list of available images for the Configuration utility and the TMOS Shell (tmsh)." It details that this process involves checksum verification.

2. F5 BIG-IP System: Software Administration Guide (v17.x)

Chapter: Managing Software Images

Section: About software images

Content: The guide explains that when you upload a software image, the system automatically verifies its digital signature to ensure the authenticity and integrity of the software image before it can be used for an installation. This verification is a prerequisite for the image appearing as a valid option.

3. F5 Networks Knowledge Base, K84554655: TMM may restart after uploading a software image to the BIG-IP system.

Section/Paragraph: "Description" section.

Content: This article notes, "When you upload a software image file to the /shared/images/ directory on the BIG-IP system, the lind process scans the file to verify that it is a valid BIG-IP software image file." This confirms an automated verification scan occurs upon upload.