Red Hat Summit3.4. Configuring short-name aliases
Always to pull an image by its fully-qualified name. However, it is customary to pull images by short names. For example, you can use ubi10 instead of registry.access.redhat.com/ubi10:latest.
The registries.conf file allows to specify aliases for short names, giving administrators full control over where images are pulled from. Aliases are specified in the table in the form "name" = "value". You can see the lists of aliases in the /etc/containers/registries.conf.d directory. Red Hat ships a set of aliases in this directory. For example, podman pull ubi10 directly resolves to the right image, that is registry.access.redhat.com/ubi10:latest.
For example:
unqualified-search-registries=["registry.fedoraproject.org", "quay.io"]
[aliases]
"fedora"="registry.fedoraproject.org/fedora"The short-names modes are:
-
enforcing: If no matching alias is found during the image pull, Podman prompts the user to choose one of the unqualified-search registries. If the selected image is pulled successfully, Podman automatically records a new short-name alias in the
$HOME/.cache/containers/short-name-aliases.conffile (rootless user) or in the/var/cache/containers/short-name-aliases.conf(root user). If the user cannot be prompted (for example, stdin or stdout are not a TTY), Podman fails. Note that theshort-name-aliases.conffile has precedence over theregistries.conffile if both specify the same alias. - permissive: Similar to enforcing mode, but Podman does not fail if the user cannot be prompted. Instead, Podman searches in all unqualified-search registries in the given order. Note that no alias is recorded.
- disabled: All unqualified-search registries are tried in a given order, no alias is recorded.
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