{
    "content": "<h1>Understanding the v2\/_catalog Endpoint<\/h1><p>The <code>v2\/_catalog<\/code> endpoint is a vital component of the <a href=\"..\/Docker-Registry-HTTP-API-V2\/\">Docker-Registry-HTTP-API-V2<\/a>. It provides a mechanism for clients to discover the full list of repositories hosted within a <a href=\"..\/Container-Registry\/\">Container-Registry<\/a>. This endpoint is primarily used by administrative tools, security scanners, and developers to audit the contents of a private or public registry.<\/p><p>When an <a href=\"..\/HTTP-GET\/\">HTTP-GET<\/a> request is made to this path, the server returns a <a href=\"..\/JSON\/\">JSON<\/a> object containing an array of repository names. Because registries can contain thousands of images, the <a href=\"..\/OCI-Distribution-Spec\/\">OCI-Distribution-Spec<\/a> mandates support for <a href=\"..\/Pagination\/\">Pagination<\/a>. This is typically achieved using the <code>n<\/code> query parameter to limit the number of results and the <code>last<\/code> parameter to specify the starting point for the next page. The server communicates the next link via the <code>Link<\/code> header in the HTTP response.<\/p><p>Security is a paramount concern for the catalog endpoint. Since it reveals the entire namespace of a registry, it is often restricted behind <a href=\"..\/Token-Authentication\/\">Token-Authentication<\/a> and <a href=\"..\/RBAC\/\">RBAC<\/a> (Role-Based Access Control) policies. Without proper authorization, a <a href=\"..\/Docker\/\">Docker<\/a> client will receive a 401 Unauthorized or 403 Forbidden status code. For detailed implementation requirements, consult the <a href=\"https:\/\/docs.docker.com\/registry\/spec\/api\/#catalog\">Official Docker Documentation<\/a> or the <a href=\"https:\/\/github.com\/opencontainers\/distribution-spec\/blob\/main\/spec.md\">OCI Distribution Specification<\/a> on GitHub.<\/p><p>Managing a <a href=\"..\/Cloud-Native\/\">Cloud-Native<\/a> environment often involves automating cleanup tasks and synchronization scripts that rely heavily on the output of this endpoint to iterate through all available <a href=\"..\/Container-Images\/\">Container-Images<\/a>.<\/p><ul><li><a href=\"..\/Docker-Registry-V2-API\/\">Docker-Registry-V2-API<\/a><\/li><li><a href=\"..\/Container-Image-Manifest\/\">Container-Image-Manifest<\/a><\/li><li><a href=\"..\/Registry-Authentication\/\">Registry-Authentication<\/a><\/li><li><a href=\"..\/OCI-Artifacts\/\">OCI-Artifacts<\/a><\/li><\/ul>",
    "tags": [
        "docker",
        "registry",
        "api",
        "catalog",
        "containers",
        "oci",
        "devops",
        "json",
        "pagination",
        "cloud-native"
    ]
}