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Chapter 12. Monitoring Images

12.1. Overview
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You can monitor images in your instance using the CLI.

12.2. Viewing Images Statistics
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OpenShift Container Platform can display several usage statistics about all the images it manages. In other words, all the images pushed to the internal registry either directly or through a build.

To view the usage statistics: 

$ oc adm top images
NAME                 IMAGESTREAMTAG            PARENTS                   USAGE                         METADATA    STORAGE
sha256:80c985739a78b openshift/python (3.5)                                                            yes         303.12MiB
sha256:64461b5111fc7 openshift/ruby (2.2)                                                              yes         234.33MiB
sha256:0e19a0290ddc1 test/ruby-ex (latest)     sha256:64461b5111fc71ec   Deployment: ruby-ex-1/test    yes         150.65MiB
sha256:a968c61adad58 test/django-ex (latest)   sha256:80c985739a78b760   Deployment: django-ex-1/test  yes         186.07MiB

The command displays the following information:

  • image ID
  • project, name, and tag of the accompanying ImageStreamTag
  • potential parents of the image, using their ID
  • information about where the image is being used
  • flag informing whether the image contains proper Docker metadata information
  • size of the image

12.3. Viewing ImageStreams Statistics
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OpenShift Container Platform can display several usage statistics about all the ImageStreams.

To view the usage statistics: 

$ oc adm top imagestreams
NAME                STORAGE     IMAGES  LAYERS
openshift/python    1.21GiB     4       36
openshift/ruby      717.76MiB   3       27
test/ruby-ex        150.65MiB   1       10
test/django-ex      186.07MiB   1       10

The command displays the following information:

  • project and name of the ImageStream
  • size of the entire ImageStream stored in the internal Red Hat Container Registry
  • number of images this particular ImageStream is pointing to
  • number of layers ImageStream consists of

12.4. Pruning Images
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The information returned from the above commands is helpful when performing image pruning.

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