Abstract: Technology for capturing a configuration of an infrastructure to enable replication of the infrastructure is provided. In one example, a layout agent may be provided for deployment to an infrastructure, including a server, together with instructions for the layout agent to capture server layout data for the server and to communicate the server layout data to a replication application. The server layout data for the server may be received at the replication application. A system model for the infrastructure may be generated based on the server layout data from the layout agent. The replication of the infrastructure as a replicated infrastructure may be initiated based on the system model.

Abstract: A technology is described for detecting a failure of a distributed system component. An example method may include registering a declarative file that may identify a distributed computing cluster in a service provider environment and provide failure criteria used to detect a failure of a distributed system component included in the distributed computing cluster. Distributed system components included in the distributed computing cluster may then be identified using information included in the declarative file. A distributed system component included in the distributed computing cluster may then be queried according to query criteria provided by the declarative file and a failure state of the distributed system component included in the distributed computing cluster may be identified based in part on a result of querying the distributed system component.

Abstract: In an application runtime environment, an application may have multiple components that are loaded at or prior to execution of the application. An online storage service is used to store up-to-date versions of the components, along with a source manifest that indicates version numbers of the up-to-date versions. Upon application startup, the application retrieves the source manifest to determine whether updated versions are available. Upon identifying updated versions, the application downloads the updated versions and loads or reloads them into the runtime environment prior to initiating the main functionality of the application.