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diff --git a/doc/daemon-management-framework.md b/doc/daemon-management-framework.md new file mode 100644 index 00000000000..592192e665d --- /dev/null +++ b/doc/daemon-management-framework.md @@ -0,0 +1,38 @@ + +How to introduce new daemons using daemon management framework +============================================================== +Glusterd manages GlusterFS daemons providing services like NFS, Proactive +self-heal, Quota, User servicable snapshots etc. Following are some of the +aspects that come under daemon management. + +Data members & functions of different management objects + +- **Connection Management** +    - unix domain sockets based channel for internal communication +    - rpc connection for the communication +    - frame timeout value for UDS +    - Methods - notify +    - init, connect, termination, disconnect APIs can be invoked using the +      connection management object + +- **Process Management** +    - Name of the process +    - pidfile to detect if the daemon is running +    - loggging directory, log file, volfile, volfileserver & volfileid +    - init, stop APIs can be invoked using the process management object + +- **Service Management** +    - connection object +    - process object +    - online status +    - Methods - manager, start, stop which can be abstracted as a common methods +      or specific to service requirements +    - init API can be invoked using the service management object + + The above structures defines the skeleton of the daemon management framework. + Introduction of new daemons in GlusterFS needs to inherit these properties. Any + requirement specific to a daemon needs to be implemented in its own service + (for eg : snapd defines its own type glusterd_snapdsvc_t using glusterd_svc_t + and snapd specific data). New daemons will need to have its own service specific + code written in glusterd-<feature>-svc.h{c} and need to reuse the existing + framework.  | 
