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% CONTAINERS-REGISTRIES.CONF(5) System-wide registry configuration file % Brent Baude % Aug 2017


containers-registries.conf - Syntax of System Registry Configuration File


The CONTAINERS-REGISTRIES configuration file is a system-wide configuration file for container image registries. The file format is TOML. The valid categories are: 'registries.search', 'registries.insecure', and 'registries.block'.

By default, the configuration file is located at /etc/containers/registries.conf.


The TOML_format is used to build a simple list format for registries under three categories: registries.search, registries.insecure, and registries.block. You can list multiple registries using a comma separated list.

Search registries are used when the caller of a container runtime does not fully specify the container image that they want to execute. These registries are prepended onto the front of the specified container image until the named image is found at a registry.

Insecure Registries. By default container runtimes use TLS when retrieving images from a registry. If the registry is not setup with TLS, then the container runtime will fail to pull images from the registry. If you add the registry to the list of insecure registries then the container runtime will attempt use standard web protocols to pull the image. It also allows you to pull from a registry with self-signed certificates. Note insecure registries can be used for any registry, not just the registries listed under search.

Block Registries. The registries in this category are are not pulled from when retrieving images.


The following example configuration defines two searchable registries, one insecure registry, and two blocked registries.

registries = ['registry1.com', 'registry2.com']

registries = ['registry3.com']

registries = ['registry.untrusted.com', 'registry.unsafe.com']


Aug 2018, Renamed to containers-registries.conf(5) by Valentin Rothberg vrothberg@suse.com

Jun 2018, Updated by Tom Sweeney tsweeney@redhat.com

Aug 2017, Originally compiled by Brent Baude bbaude@redhat.com