Prerequisities for a ULN Local Mirror

The system that you set up as a local distribution mirror must meet the following criteria:

• Must have Internet access to connect to ULN.
• Must have enough memory to create the yum metadata.
• Must be configured to provide access to the mirrored channels by system clients.
• Must have enough disk space to store copies of the packages that it hosts.

When calculating for the needed disk space, consider the following:

• Disk space requirements depend on the channels that you decide to mirror. Other factors are the number of clients to be serviced, including their platforms, OS, and other specific packages that each client might require and which would require updates.
• Disk space that's used for a mirror is only consumed and is never released. Thus, disk requirements aren't static and can increase over time.
• Packages in the channels are also updated on a regular schedule and further affect storage requirements on the local server.

For guidance in estimating the disk size requirements, use the appropriate tools to calculate the size of a specific channel. Because channels are dynamic and grow over time, always plan to allocate substantially greater disk space than the current size suggests. Optionally, you can create a dedicated file system and mount this to the directory that hosts the mirrored channels.