What is portmap in NFS?
The portmap daemon runs on the same system as the NFS application. When the server starts running, it registers with the portmap daemon. As a function of this registration, the server supplies its program number, version number, and UDP or TCP port number. The portmap daemon keeps a table of server applications.
What is portmap rpcbind?
portmap or just portmap, or rpcbind) is an Open Network Computing Remote Procedure Call (ONC RPC) service that runs on network nodes that provide other ONC RPC services. Version 2 of the port mapper protocol maps ONC RPC program number/version number pairs to the network port number for that version of that program.
How do I check if portmap is running?
To check the status of the service : # service portmap status portmap (pid 8951) is running…
What is rpcbind in NFS?
The rpcbind service redirects the client to the proper port number so it can communicate with the requested service. Because RPC-based services rely on rpcbind to make all connections with incoming client requests, rpcbind must be available before any of these services start.
Why does NFS use RPC?
NFS uses Remote Procedure Calls (RPC) to route requests between clients and servers, meaning that the portmap service must be enabled and active at the proper runlevels for NFS communication to occur.
What is RPC daemon?
Sun Microsystems has developed a mechanism for client-server applications called RPC, Remote Procedure Call, which is in the public domain and used by most flavors of Unix. The file /etc/rpc maps service names to their program numbers. …
What is portmap in Linux?
Portmap is a server that converts RPC program numbers into DARPA protocol port numbers. It must be running in order to make RPC calls. When an RPC server is started, it will tell portmap what port number it is listening to, and what RPC program numbers it is prepared to serve.
What is Rpcinfo in Linux?
The rpcinfo command makes an RPC call to an RPC server and reports the status of the server. For instance, this command reports whether the server is ready and waiting or not available. If you specify a version, the rpcinfo command attempts to call that version of the specified program.
What is RPC mount?
The mountd daemon is a Remote Procedure Call (RPC) that answers a client request to mount a file system. The mountd daemon finds out which file systems are available by reading the /etc/xtab file. In addition, the mountd daemon provides a list of currently mounted file systems and the clients on which they are mounted.
How does portmap communicate with portrpc?
RPC processes notify portmap when they start, revealing the port number they are monitoring and the RPC program numbers they expect to serve. The client system then contacts portmap service on the server with a particular RPC program number. portmap then redirects the client to the proper port number to communicate with its intended service.
What happened to portmap in Linux?
Portmap is replaced by rpcbind on some linux distributions such as Fedora 8,RHEL 6 and CentOS 6. Portmap is now started and stopped as part of the rpcbind service.
How to install portmap on RHEL 6?
When you try to install portmap on RHEL 6, it will install rpcbind instead : [root@rhel6 ~]# yum install portmap -y Loaded plugins: rhnplugin This system is not registered with RHN. RHN support will be disabled.
How do I restart portmap service?
To restart the service : Conditionally restarting the service : There is no configuration file for this service. The following options may be added by portmap daemon: -d: prevents portmap from running as a daemon, and causes errors and debugging information to be printed to the standard error output.