You may optionally install orchestrator-agent on your MySQL hosts.
orchestrator-agent* is a service which registers with your orchestrator server and accepts requests by orchestrator via web API.
Supported requests relate to general, OS and LVM operations, such as:
- Stopping/starting MySQL service on host
- Getting MySQL OS info such as data directory, port, disk space usage
- Performing various LVM operations such as finding LVM snapshots, mounting/unmounting a snapshot
- Transferring data between hosts (e.g. via
netcat)
orchestrator-agent is an ongoing effort in solving host-specific operations. It was originally developed to overcome cloning and restoring issues, and later expanded to other areas.
The information and API exposed by orchestrator-agent to orchestrator allow orchestrator to coordinate and operate seeding of new or corrupted machines by getting data from freshly available snapshots. Moreover, it allows orchestrator
to automatically suggest the source of data for a given MySQL machine, by looking up such hosts that actually have a
recent snapshot available, preferably in the same datacenter.
For security measures, an agent requires a token to operate all but the simplest requests. This token is randomly generated by the agent and negotiated with orchestrator. orchestrator does not expose the agent's token (right now some work needs to be done on obscuring the token on error messages).