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2.3.2. 文件存储

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标签和镜像元数据存储在 OpenShift Container Platform 中,但 registry 将层和签名数据存储在挂载到位于 /registry 的 registry 容器中的卷中。因为 oc exec 不在特权容器上工作,若要查看 registry 的内容,您必须手动 SSH 到 registry pod 的容器所在的节点,然后在容器本身上运行 docker exec

  1. 列出当前的 pod 以查找容器镜像 registry 的 pod 名称:

    # oc get pods

    然后,使用 oc describe 来查找运行容器的节点的主机名:

    # oc describe pod <pod_name>
  2. 登录到所需的节点:

    # ssh node.example.com
  3. 从节点主机上的默认项目中列出正在运行的容器,并确定容器镜像 registry 的容器 ID:

    # docker ps --filter=name=registry_docker-registry.*_default_
  4. 使用 oc rsh 命令列出 registry 内容:

    # oc rsh dc/docker-registry find /registry
    /registry/docker
    /registry/docker/registry
    /registry/docker/registry/v2
    /registry/docker/registry/v2/blobs 1
    /registry/docker/registry/v2/blobs/sha256
    /registry/docker/registry/v2/blobs/sha256/ed
    /registry/docker/registry/v2/blobs/sha256/ed/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810
    /registry/docker/registry/v2/blobs/sha256/ed/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810/data 2
    /registry/docker/registry/v2/blobs/sha256/a3
    /registry/docker/registry/v2/blobs/sha256/a3/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4
    /registry/docker/registry/v2/blobs/sha256/a3/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4/data
    /registry/docker/registry/v2/blobs/sha256/f7
    /registry/docker/registry/v2/blobs/sha256/f7/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845
    /registry/docker/registry/v2/blobs/sha256/f7/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845/data
    /registry/docker/registry/v2/repositories 3
    /registry/docker/registry/v2/repositories/p1
    /registry/docker/registry/v2/repositories/p1/pause 4
    /registry/docker/registry/v2/repositories/p1/pause/_manifests
    /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions
    /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256
    /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf
    /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures 5
    /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256
    /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810
    /registry/docker/registry/v2/repositories/p1/pause/_manifests/revisions/sha256/e9a2ac6418981897b399d3709f1b4a6d2723cd38a4909215ce2752a5c068b1cf/signatures/sha256/ede17b139a271d6b1331ca3d83c648c24f92cece5f89d95ac6c34ce751111810/link 6
    /registry/docker/registry/v2/repositories/p1/pause/_uploads 7
    /registry/docker/registry/v2/repositories/p1/pause/_layers 8
    /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256
    /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4
    /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4/link 9
    /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845
    /registry/docker/registry/v2/repositories/p1/pause/_layers/sha256/f72a00a23f01987b42cb26f259582bb33502bdb0fcf5011e03c60577c4284845/link
    1
    此目录将所有层和签名存储为 blob。
    2
    此文件包含 blob 的内容。
    3
    此目录存储所有镜像存储库。
    4
    此目录适用于单个镜像存储库 p1/pause
    5
    此目录包含特定镜像清单修订版本的签名。
    6
    此文件包含返回到 blob(包含签名数据)的引用。
    7
    此目录包含目前为给定存储库上传和暂存的任何层。
    8
    此目录包含指向这个存储库引用的所有层的链接。
    9
    此文件包含对已通过镜像链接到该存储库的特定层的引用。
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