Images

An important concept is local image versus remote image.

The ICE ClusterWare™ backend retains the official copy of file system images, which are termed remote images. When a compute node PXE boots, it first downloads the Linux kernel and initramfs provided as part of the boot configuration assigned to the node. Next, the node downloads the remote image referenced in the boot configuration from a head node or peer node.

When a tool such as scyld-modimg creates or manipulates image contents, the tool manipulates a cached local version of the remote image. Per-administrator cache(s) are ~/.scyldcw/workspace/. The tool first downloads a remote image into the cache if it doesn't already exist there. Typically a new or modified cached local image is uploaded to the database when the creation or modification is complete.

See Deleting Unused Images for details about how to delete local or remote images.

• Images Page
  • Create an Image
  • Edit Image
  • Delete Image
  • Related Links
• Creating Images
• Recreating the Default Image
• Repos and Distros
  • Using ISO Releases
  • Using Archived Releases
  • Installing Software With Subscriptions
• Modifying Images
• Caching in scyld-modimg
• Updating the Kernel in an Image
• Updating Drivers Inside Images
• Capturing and Importing Images
• Automating Common Image Tasks
• Deploying Images Using Ignition
• Freezing an Image
• Deleting Unused Images