Using Image Snapshots to Accelerate Image Pull

Scenario

Image snapshots provide a more efficient way to start up containers. Using an image snapshot to create a pod accelerates image pull and reduces the time required for starting up the containers. For details about how to use image snapshots, see Using Image Snapshots.

Procedure

1. Log in to the CCI console. In the navigation pane, choose Image Snapshots. On the displayed page, click Create from YAML. The following is an example YAML file:

   apiVersion: cci/v2
   kind: ImageSnapshot
   metadata:
     name: imagesnapshot-a
   spec:
     buildingConfig:
       namespace: default  # Namespace
     imageSnapshotSize: 20 # Image snapshot size, in GiB
     ttlDaysAfterCreated: 100 # Image validity period
     images:
       - image: nginx:stable-alpine-perl # Image
     registries: []

2. In the navigation pane, choose Workloads. On the Deployments tab, click Create from YAML to create a workload. Add cci.io/image-snapshot-auto-match: 'true' in annotations. The following is an example:

   kind: Deployment
   apiVersion: cci/v2
   metadata:
     name: nginx
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: nginx
     template:
       metadata:
         labels:
           app: nginx
         annotations:
           cci.io/image-snapshot-auto-match: 'true' # Automatic matching of image snapshots
       spec:
         containers:
           - name: nginx
             image: nginx:stable-alpine-perl
             resources:
               requests:
                 cpu: 500m
                 memory: 1Gi

3. Verify that the pod annotations contain the cci.io/image-snapshot-detail and cci.io/imagesnapshot-volume fields, the matched image snapshot is displayed, and the size of the mounted data disk is the same as that of the image snapshot.