cfsd

cfsd

cfsd is the single node server application within a CFS cluster. It runs the following services by default:

• Formic GRPC service on 12300
• Group Store GRPC service on port 12310
• Group Store Replication service on port 12311
• Value Store GRPC service on port 12320
• Value Store Replication service on port 12321
• HTTP service on port 9100 which serves the following paths:
  • /metrics providing Prometheus metric information
  • /log/level allowing getting/setting of the log level on the fly
  • /debug/pprof providing standard Go pprof access

Normally one would just run cfsd with no parameters and all of the above would be started. But there are options to start fewer services, enable debug logging on start up, etc. Just run cfsd -help for more information.

The default all-in-one behavior is for ease of deployment and maintenance, as it keeps everything as one type of server. But more particular deployments may want to separate the services to run on hardware specifically tuned for each.

All configuration information is stored in /etc/cfsd which is generated by the cfsadm tool. All data persisted by the Stores is written to /var/lib/cfsd which will be created if it does not exist.

The Formic GRPC service is the only one that should be public facing, as it is the service the cfs client tool connects to. Formic then connects to the Group and Value Stores via their GRPC services, and the Replication services talk to one another. One deployment strategy is to keep the whole cluster on a private network and provide a public load balancer that directs cfs clients to balance across the Formic services.