Evaluate container lifecycle support in TOSCA TOSCA – 174 Adhoc TC

Evaluate various types of containers support for TOSCA – Full OS containers (compute node) VM LXC – Application containers Docker PaaS containers Evaluation context for container support – Mutability – Supported – Resource Isolation policies – Supported through Node types – Deployment methods – Supported through plans – Container types – Supported through node types Container Types TOSCA Evaluate container lifecycle support in TOSCA

Container Abstraction Should container be represented by Node Type in Topology template OR is it an deployment abstraction? Container is a Node type Containment is a tree structure in TOSCA – Supported by requirements and capabilities Various types of container are supported – Compute node (Full OS) – Application container Nested containers are a modeling construct and supported Container placement control is currently not supported TOSCA Evaluate container lifecycle support in TOSCA

Use sample containers to build TOSCA service template Pick one Full OS and one application container Create 2 tier application topology Map lifecycle of these containers Identify constraints and challenges Observations: Networking of containers – Inter host communication through bridge on OpenStack could be a problem with Docker containers (multi node stack) Workaround Workaround using Port forward from host to Docker OVS bridge between hosts with containers getting private ip address with bridged with local host Container is represented by NodeType, currently there is no way to abstract a container to avoid node proliferation Workarounds Create new type for each image Or define capabilities & requirements on the template Link to Sample use case: Use Cases TOSCA Evaluate container lifecycle support in TOSCA

Map container lifecycle events to TOSCA Typical container events deploy/init/stop/dispose(Runtime) build/modify/delete (devtime) – Not covered by TOSCA Multi host environment TOSCA events create/pre-configure/configure/post-configure/start/stop TOSCA events are superset of typical container events Container Lifecycle mapping TOSCA Evaluate container lifecycle support in TOSCA

5> Discuss support for composite nodes (specifically immutable containers), and avoid node proliferation through node decoration Support for Composite nodes TOSCA Evaluate container lifecycle support in TOSCA