fedfs-null man page
fedfs-null — send a FEDFS_NULL ADMIN protocol request
fedfs-null [-?d] [-n nettype] [-h hostname] [-s security]
RFC 5716 introduces the Federated File System (FedFS, for short). FedFS is an extensible standardized mechanism by which system administrators construct a coherent namespace across multiple file servers using file system referrals. For further details, see fedfs(7).
FedFS-enabled file servers allow remote administrative access via an authenticated RPC protocol known as the FedFS ADMIN protocol. Using this protocol, FedFS administrators manage FedFS junctions and NSDB connection parameter information on remote FedFS-enabled file servers.
The fedfs-null(8) command is part of a collection of low-level single-use programs that is intended for testing the FedFS ADMIN protocol or for use in scripts. It sends a single FEDFS_NULL request to a remote FedFS ADMIN protocol service.
The FEDFS_NULL request performs a simple ping operation that determines if there is an operational FedFS ADMIN service on the remote server.
- -d, --debug
Enables debugging messages during operation.
- -?, --help
Displays fedfs-null(8) version information and a usage message on stderr.
- -h, --hostname=hostname
Specifies the hostname of a remote FedFS ADMIN service. If this option is not specified, the default value is localhost.
- -n, --nettype=nettype
Specifies the transport to use when contacting the remote FedFS ADMIN service. Typically the nettype is one of tcp or udp. If this option is not specified, the default value is netpath. See rpc(3t) for details.
- -s, --security=flavor
Specifies the security flavor to use when contacting the remote FedFS ADMIN service. Valid flavors are sys, unix, krb5, krb5i, and krb5p. If this option is not specified, the unix flavor is used. See the Security section of this man page for details.
Suppose you are the FedFS administrator of the example.net FedFS domain and that you want to know if the FedFS ADMIN service on the file server fs.example.net is operational. Use:
$ fedfs-null -h fs.example.net
Call completed successfully
By default, or if the sys and unix flavors are specified with the --security=flavor option, the fedfs-create-junction(8) command uses AUTH_SYS security for the Remote Procedure Call. AUTH_SYS has known weaknesses and should be avoided on untrusted networks.
The RPC client uses the Kerberos v5 GSS mechanism if a Kerberos security flavor is specified. When specifying a Kerberos security flavor, the user must first obtain a valid Kerberos ticket using kinit(1) before running fedfs-create-junction(8).
The AUTH_NONE security flavor is no longer supported by this implementation.
fedfs(7), rpc.fedfsd(8), kinit(1), rpc(3t)
RFC 5716 for FedFS requirements and overview
This page is part of the fedfs-utils package. A description of the project and information about reporting bugs can be found at http://wiki.linux-nfs.org/wiki/index.php/FedFsUtilsProject.
Chuck Lever <email@example.com>