Methods, computer program products, and systems are presented. The method, computer program products, and systems can include, for instance: obtaining configuration data that specifies a designated runtime container image; selecting a first subset of content of a first container image stored in a system memory, the selecting based on an action referenced in the configuration data; extracting the first subset of content from the first container image, the extracting including providing a second container image that includes the first subset of content of the first container image and is absent of a second subset of content of the first container image; and running the designated runtime container image to provide a runtime container, the designated runtime container image having the first subset of content of the first container image.