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ManualsBrandsRed Hat ManualsComputer equipmentENTERPRISE LINUX - ONLINE STORAGE RECONFIGURATION GUIDE BETA
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Important
In order for NFS to work with a default installation of Red Hat Enterprise Linux with a firewall
enabled, configure IPTables with the default TCP port 2049. Without proper IPTables
configuration, NFS will not function properly.
The NFS initialization script and rpc. nfsd process now allow binding to any specified port
during system start up. However, this can be error-prone if the port is unavailable, or if it
conflicts with another daemon.
9.1.1. Required Services
Red Hat Enterprise Linux uses a combination of kernel-level support and daemon processes to
provide NFS file sharing. All NFS versions rely on Remote Procedure Calls (RPC) between clients and
servers. RPC services under Red Hat Enterprise Linux 6 are controlled by the rpcbi nd service. To
share or mount NFS file systems, the following services work together depending on which version of
NFS is implemented:
Note
The po rtmap service was used to map RPC program numbers to IP address port number
combinations in earlier versions of Red Hat Enterprise Linux. This service is now replaced by
rpcbi nd in Red Hat Enterprise Linux 6 to enable IPv6 support. For more information about
this change, refer to the following links:
TI-RPC / rpcbind support: http://nfsv4.bullopensource.org/doc/tirpc_rpcbind.php
IPv6 support in NFS: http://nfsv4.bullopensource.org/doc/nfs_ipv6.php
n f s
servi ce nfs start starts the NFS server and the appropriate RPC processes to service
requests for shared NFS file systems.
n f slo ck
servi ce nfsl o ck start activates a mandatory service that starts the appropriate RPC
processes allowing NFS clients to lock files on the server.
rp cb in d
rpcbi nd accepts port reservations from local RPC services. These ports are then made
available (or advertised) so the corresponding remote RPC services can access them.
rpcbi nd responds to requests for RPC services and sets up connections to the requested
RPC service. This is not used with NFSv4.
rp c.n f sd
rpc. nfsd allows explicit NFS versions and protocols the server advertises to be defined. It
works with the Linux kernel to meet the dynamic demands of NFS clients, such as providing
server threads each time an NFS client connects. This process corresponds to the nfs
service.
⁠Chapt er 9 . Net work File Syst em (NFS)
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