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7.7.2. Mirroring an image set in a fully disconnected environment

To mirror an image set in a fully disconnected environment, you must first mirror the image set to disk, then mirror the image set file on disk to a mirror.

7.7.2.1. Mirroring from mirror to disk
링크 복사

You can use the oc-mirror plugin to generate an image set and save the contents to disk. The generated image set can then be transferred to the disconnected environment and mirrored to the target registry.

중요

Depending on the configuration specified in the image set configuration file, using oc-mirror to mirror images might download several hundreds of gigabytes of data to disk.

The initial image set download when you populate the mirror registry is often the largest. Because you only download the images that changed since the last time you ran the command, when you run the oc-mirror plugin again, the generated image set is often smaller.

You are required to specify a storage backend in the image set configuration file. This storage backend can be a local directory or a docker v2 registry. The oc-mirror plugin stores metadata in this storage backend during image set creation.

중요

Do not delete or modify the metadata that is generated by the oc-mirror plugin. You must use the same storage backend every time you run the oc-mirror plugin for the same mirror registry.

Prerequisites

  • You have access to the internet to obtain the necessary container images.
  • You have installed the OpenShift CLI (oc).
  • You have installed the oc-mirror CLI plugin.
  • You have created the image set configuration file.

Procedure

  • Run the oc mirror command to mirror the images from the specified image set configuration to disk: 

    $ oc mirror --config=./imageset-config.yaml \
    1 
    
  file://<path_to_output_directory> --v1
    2
    1
    Pass in the image set configuration file that was created. This procedure assumes that it is named imageset-config.yaml.
    2
    Specify the target directory where you want to output the image set file. The target directory path must start with file://.

Verification

  1. Navigate to your output directory: 

    $ cd <path_to_output_directory>

  2. Verify that an image set .tar file was created: 

    $ ls

    Example output

    mirror_seq1_000000.tar

Next steps

  • Transfer the image set .tar file to the disconnected environment.

Troubleshooting

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