Help Center/ Cloud Container Instance (CCI)/ User Guide/ Using CCI Through the Console/ Images/ Image Snapshots/ Overview
Updated on 2025-08-12 GMT+08:00
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Overview

You can pull images from SWR, open-source image repositories, and self-managed image repositories to create image snapshots and then use them to create workloads without pulling the images, speeding up workload startup.

You can use an image snapshot to create a pod. There is no need to pull the image, and therefore pod startup time is reduced. This section describes the constraints on image snapshots and how you can use them.

Constraints

  • An image snapshot can contain a maximum of 10 images.
  • Private image repositories are supported. However, the access credentials of private image repositories must be provided, including the address and authentication information, such as the auth information in ~/.docker/config.json.
  • If the image needs to be pulled over the public network, you need to specify the public network access configuration in advance.
  • If only some images in an image snapshot are consistent with those for the pod, inconsistent images still need to be pulled.
  • If the image of a running pod changes and the new image is inconsistent with any image in the image snapshot, the new image needs to be pulled.
  • By default, a CCI pod with 0.5 vCPUs and 1 GiB of memory is used to create an image snapshot. There are expenditures during the creation.

The following figure illustrates how to create an image snapshot.

How to Use

You can use an image snapshot to create a pod in either of the following ways:

  • Automatic matching

The optimal image is selected from all available image snapshots you have created. The matching is performed in the following sequence:

a. Image matching degree: The images in the image snapshots are matched with those for the pod, and the mostly matched image snapshot is preferred.

b. Time when image snapshots were created: Image snapshots that were created later are preferred.

  • Specific image snapshot

Specify the image snapshot to be used.

Parent topic: Image Snapshots