RightAgent provides a foundation for running an agent on a server to interface in a secure fashion with other agents in the RightScale system. A RightAgent uses RabbitMQ as the message bus and the RightScale mapper as the routing node. Servers running a RightAgent establish a queue on startup for receiving packets routed to it via the mapper. The packets are structured to invoke services in the agent represented by actors and methods. The RightAgent may respond to these requests with a result packet that the mapper then routes to the originator. Similarly a RightAgent can also make requests of other RightAgents in the RightScale system.
Refer to the wiki (github.com/rightscale/right_agent/wikis) for up-to-date documentation.
Also use the built-in issues tracker (github.com/rightscale/right_agent/issues) to report issues.
A RightAgent exposes its services via actors and methods that are invoked by requests packets it receives via its message queue. All RightAgents have a general purpose actor named agent_manager that provides the following services:
agent_manager/ping: Respond with basic status information to indicate that active
agent_manager/stats: Retrieve statistics about agent operation
agent_manager/set_log_level: Change log level of agent
agent_manager/execute: Eval code in context of agent
agent_manager/connect: Connect agent to additional broker or reconnect it to one
agent_manager/disconnect: Disconnect agent from broker
RightAgent comes with several library modules for forming basic command line tools:
agent_deployer: Build a configuration file for running the agent (rad tool)
agent_controller: Manage an agent that has been configured (rnac tool)
stats_manager: Display operation statistics for an agent (rstat tool)
log_level_manager: Retrieve and set log level for an agent (rlog tool)
RightAgent has been tested on EC2 instances running CentOS 5.2 and Ubuntu 8.10.
Work in Progress
RightAgent is work in progress, expect more documentation and examples in the near future.
RabbitMQ is www.rabbitmq.com/documentation.html
Copyright © 2011 RightScale, Inc.
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