International Business Machines Corporation

Jack Richard William Stevenson

Martin Andrew Ross

Jack William Donato Evans

Luke James Powlett

Jake Amies

Determining correct base container images to support custom container images is provided. A comparison between layers of a base container image corresponding to a current version of an operand and layers of a custom container image built by a user is performed using an operator. It is determined whether the user utilized a correct base container image to build the custom container image based on the comparison between the layers of the base container image corresponding to the current version of the operand and the layers of the custom container image built by the user. A runtime is generated in a cluster of host nodes to provide a service based on the custom container image in response to determining that the user utilized the correct base container image to build the custom container image.

Determining correct base images for custom images

A method, computer system, and computer program product for migrating a service (e.g. microservice) from using a first application programming interface version to using a second (e.g. newer or updated) application programming interface version. The method may include determining a difference between specifications of the first and second versions of the application programming interface. Historical usage of the first version of the application programming interface by the service may then be analyzed with respect to the difference so as to determine if the service meets the specification of the second version of the application programming interface. Responsive to determining the service meets the specification of the second version of the application programming interface difference, the service may be migrated from using the first version of the application programming interface to using the second version of the application programming interface.

Migrating a service to a version of an application programming interface

A method, computer system, and a computer program product for coordinating requests actioned at a scalable application is provided. The present invention may include registering metadata regarding response behavior to be applied when actioning a client request to multiple application instances. The present invention may include augmenting a client request according to the metadata to provide augmented request instances to coordinate completion on a required number of response instances from the application instances to which the augmented request instances are routed. The present invention may include coordinating a status of the client request across the application instances to terminate outstanding augmented request instances when a required number of completed instances is received.

Coordinating requests actioned at a scalable application

Concepts for controlling interaction with a scalable application are presented. An example includes registering an interface specification to an application, wherein metadata is associated with the interface specification. The method then includes routing a request to instances of the application based on the metadata associated with the interface specification for the application, then combining one or more responses from the instances of the application to form an aggregate response based on the metadata associated with the interface specification for the application.

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Winchester, United Kingdom

Jack Richard William Stevenson