provisioning-service

Provisioning service

Kernel service which provides a classic SCRUD interface (minus Update) for all running services in this environment (and functionality to ensure this matches what is actually running - starting/stopping services as required)

Interface

• com.hailocab.kernel.provision.search (search for provisions which match a given name and/or running on this class of machine)
• com.hailocab.kernel.provision.create (create a new provision)
• com.hailocab.kernel.provision.read (read an existing provision)
• com.hailocab.kernel.provision.delete (delete an exisitng provision)

There's no update endpoint because users just bring services up and down, they don't modify any of the fields.

Inner workings

This service will:

• start services
• stop services
• ensure services running match what are supposed to be running

DB

We will store a provisioned_service record for every service which is running in Cassandra.

Each record will be an immutable record of a provision that is running, and will include:

• service_name (fully qualified service name, eg: com.hailocab.kernel.discovery)
• service_version (actually a date, eg: 20130618183200)
• machine_class (the class of machine the service should be running on)

Setup

• go get github.com/hailo-platform/H2O/goprotobuf/{proto,protoc-gen-go}
• go get "github.com/pomack/thrift4go/lib/go/src/thrift"
• cat create.cql | cqlsh -3