| .. This work is licensed under a Creative Commons Attribution 4.0 International License. | |
| .. http://creativecommons.org/licenses/by/4.0 | |
| Service Discovery | |
| ================= | |
| Service discovery is an architecture pattern used for components | |
| (micro-services) to locate each other. The DCAE platform uses | |
| `server-side | |
| discovery <http://microservices.io/patterns/server-side-discovery.html>`__ | |
| and is using `Consul <https://www.consul.io/>`__ as the service registry | |
| solution. | |
| Service registration | |
| -------------------- | |
| All components are required to register with Consul in order to be | |
| discovered. There are two methods of registration: self and 3rd party. | |
| The DCAE platform uses 3rd party registration which means components | |
| don’t actually make the registration calls but defers that | |
| responsibility to a platform service. | |
| Implementation for Docker | |
| ~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| `Registrator <http://gliderlabs.com/registrator/latest/>`__ is an open | |
| source application that is responsible for registering all components | |
| that run as Docker containers. Registrator watches the local Docker | |
| engine’s activity log and will register and unregister a Docker | |
| container when the container is started and stopped. | |
| Implementation for CDAP | |
| ~~~~~~~~~~~~~~~~~~~~~~~ | |
| The CDAP broker is a REST web service that is responsible for | |
| registering all components that run as CDAP applications. |