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# For more information on this configuration file, see containers-registries.conf(5).## There are multiple versions of the configuration syntax available, where the# second iteration is backwards compatible to the first one. Mixing up both# formats will result in an runtime error.## The initial configuration format looks like this:## NOTE: RISK OF USING UNQUALIFIED IMAGE NAMES# Red Hat recommends always using fully qualified image names including the registry server (full dns name),# namespace, image name, and tag (ex. registry.redhat.io/ubi8/ubu:latest). When using short names, there is# always an inherent risk that the image being pulled could be spoofed. For example, a user wants to.# pull an image named `foobar` from a registry and expects it to come from myregistry.com. If myregistry.com# is not first in the search list, an attacker could place a different `foobar` image at a registry earlier# in the search list. The user would accidentally pull and run the attacker's image and code rather than the# intended content. Red Hat recommends only adding registries which are completely trusted, i.e. registries# which don't allow unknown or anonymous users to create accounts with arbitrary names. This will prevent# an image from being spoofed, squatted or otherwise made insecure. If it is necessary to use one of these# registries, it should be added at the end of the list.## It is recommended to use fully-qualified images for pulling as the# destination registry is unambiguous. Pulling by digest# (i.e., quay.io/repository/name@digest) further eliminates the ambiguity of# tags.# The following registries are a set of secure defaults provided by Red Hat.# Each of these registries provides container images curated, patched# and maintained by Red Hat and its partners#[registries.search]#registries = ['registry.access.redhat.com', 'registry.redhat.io']# To ensure compatibility with docker we've included docker.io in the default search list. However Red Hat# does not curate, patch or maintain container images from the docker.io registry.[registries.search]registries = ['registry.access.redhat.com', 'registry.redhat.io', 'docker.io']# The following registries entry can be used for convenience but includes# container images built by the community. This set of content comes with all# of the risks of any user generated content including security and performance# issues. To use this list first comment out the default list, then uncomment# the following list#[registries.search]#registries = ['registry.access.redhat.com', 'registry.redhat.io', 'docker.io', 'quay.io']# Registries that do not use TLS when pulling images or uses self-signed# certificates.[registries.insecure]registries = []# Blocked Registries, blocks the `docker daemon` from pulling from the blocked registry. If you specify# "*", then the docker daemon will only be allowed to pull from registries listed above in the search# registries. Blocked Registries is deprecated because other container runtimes and tools will not use it.# It is recommended that you use the trust policy file /etc/containers/policy.json to control which# registries you want to allow users to pull and push from. policy.json gives greater flexibility, and# supports all container runtimes and tools including the docker daemon, cri-o, buildah ...# The atomic CLI `atomic trust` can be used to easily configure the policy.json file.[registries.block]registries = []# The second version of the configuration format allows to specify registry# mirrors:## # An array of host[:port] registries to try when pulling an unqualified image, in order.unqualified-search-registries = ["registry.fedoraproject.org", "registry.access.redhat.com", "registry.centos.org", "docker.io"]## [[registry]]# # The "prefix" field is used to choose the relevant [[registry]] TOML table;# # (only) the TOML table with the longest match for the input image name# # (taking into account namespace/repo/tag/digest separators) is used.# ## # If the prefix field is missing, it defaults to be the same as the "location" field.# prefix = "example.com/foo"## # If true, unencrypted HTTP as well as TLS connections with untrusted# # certificates are allowed.# insecure = false## # If true, pulling images with matching names is forbidden.# blocked = false## # The physical location of the "prefix"-rooted namespace.# ## # By default, this equal to "prefix" (in which case "prefix" can be omitted# # and the [[registry]] TOML table can only specify "location").# ## # Example: Given# # prefix = "example.com/foo"# # location = "internal-registry-for-example.net/bar"# # requests for the image example.com/foo/myimage:latest will actually work with the# # internal-registry-for-example.net/bar/myimage:latest image.# location = internal-registry-for-example.com/bar"## # (Possibly-partial) mirrors for the "prefix"-rooted namespace.# ## # The mirrors are attempted in the specified order; the first one that can be# # contacted and contains the image will be used (and if none of the mirrors contains the image,# # the primary location specified by the "registry.location" field, or using the unmodified# # user-specified reference, is tried last).# ## # Each TOML table in the "mirror" array can contain the following fields, with the same semantics# # as if specified in the [[registry]] TOML table directly:# # - location# # - insecure# [[registry.mirror]]# location = "example-mirror-0.local/mirror-for-foo"# [[registry.mirror]]# location = "example-mirror-1.local/mirrors/foo"# insecure = true# # Given the above, a pull of example.com/foo/image:latest will try:# # 1. example-mirror-0.local/mirror-for-foo/image:latest# # 2. example-mirror-1.local/mirrors/foo/image:latest# # 3. internal-registry-for-example.net/bar/myimage:latest# # in order, and use the first one that exists.