Bind the socket connector you defined with the port number you defined; Without this binding, you won't know which port to listen to in the next listening. There are many ports in the system, which are detailed in vim /etc/init.d/rpcbind.

It is an RPC service. When nfs is available, the master D is responsible for notifying the client and server of the NFS port number. Simply understood as rpc is an intermediary service.

/etc/init.d/rpcbind is to open rpcbind? service command

Extended data:

How to check whether rpcbind is turned on:

1, in linux 5. X and below, you can use the duservice portmap status command to check whether rpc is started.

If the prompt is running, it means it is running; If prompted, stop closing. If it is not installed, you can install the portmap package on the CD. Start opening through service port mapping.

2. In linux 6 and above, you can check whether rpc is turned on through the service rpcbind status command.

If not, just install the rpcbind package on the CD. Open through service rpcbind start.

But the default is false.