How to check S3 bucket being used and its size for the Openshift-image-registry in ROSA

Solution Verified - Updated -

Environment

  • Red Hat OpenShift Service on AWS (ROSA)

Issue

  • Which Amazon S3 bucket is used to store images
  • What is a disk usage of OpenShift Image Registry on Amazon S3

Resolution

  • By default images are stored in Amazon S3 according to the official ROSA documentation.

  • Identify which bucket is used for image-registery

$ oc get deployment/image-registry -o yaml -n openshift-image-registry

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "3"
    imageregistry.operator.openshift.io/checksum: sha256:a31a13efbd4484a6dbc9bdca643fa286a9ad8515af80e5386d9a8aa851cfeeb7
    operator.openshift.io/spec-hash: e0e64343b2c1e37bdb57325a721ecef2604d4e159da9389f9d4a10b2eb41b49c
    release.openshift.io/version: 4.13.1
  creationTimestamp: "2023-06-11T02:04:48Z"
  generation: 3
  labels:
    docker-registry: default
  name: image-registry
  namespace: openshift-image-registry

.......output omitted........ 

      containers:
      - command:
        - /bin/sh
        - -c
        - mkdir -p /etc/pki/ca-trust/extracted/edk2 /etc/pki/ca-trust/extracted/java
          /etc/pki/ca-trust/extracted/openssl /etc/pki/ca-trust/extracted/pem && update-ca-trust
          extract && exec /usr/bin/dockerregistry
        env:
        - name: REGISTRY_STORAGE
          value: s3                                                                    
        - name: REGISTRY_STORAGE_S3_BUCKET                                              <------ storage class
          value: bucketname-xxxxx-image-registry-ap-southeast-2-cmblswywsfioepxufj      <------ bucket location
        - name: REGISTRY_STORAGE_S3_REGION
          value: ap-southeast-2
  • Identify the size of the used disk space
$  aws s3 ls --summarize --human-readable --recursive s3://bucketname-xxxxx-image-registry-ap-southeast-2-cmblswywsfioepxufj
....output omitted...

Total Objects: 292
   Total Size: 399.1 MiB

Alternatively navigate to S3 Dashboard and check the size though the dashboard

Root Cause

  • By default ROSA Openshift Image Registry is configured to use Amazon S3 to store images

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