xenial (1) fs_exportafs.1.gz

Provided by: openafs-client_1.6.15-1ubuntu1.1_amd64 bug

NAME

       fs_exportafs - Configures export of AFS to clients of other file systems

SYNOPSIS

       fs exportafs -type <exporter name>
           [-start <start/stop translator (on | off)>]
           [-convert <convert from afs to unix mode (on | off)>]
           [-uidcheck <run on strict 'uid check' mode (on | off)>]
           [-submounts <allow nfs mounts to subdirs of /afs/.. (on | off)>]
           [-help]

       fs exp -t <exporter name>
           [-st <start/stop translator (on | off)>]
           [-c <convert from afs to unix mode (on | off)>]
           [-u <run on strict 'uid check' mode (on | off)>]
           [-su <allow nfs mounts to subdirs of /afs/.. (on | off)>]
           [-h]

DESCRIPTION

       The fs exportafs command sets (if the -start argument is provided) or reports (if it is omitted) whether
       the machine can reexport the AFS filespace to clients of a non-AFS file system. To control certain
       features of the translation protocol, use the following arguments:

       •   To control whether the UNIX group and other mode bits on an AFS file or directory are set to match
           the owner mode bits when it is exported to the non-AFS file system, use the -convert argument.

       •   To control whether tokens can be placed in a credential structure identified by a UID that differs
           from the local UID of the entity that is placing the tokens in the structure, use the -uidcheck
           argument. The most common use is to control whether issuers of the knfs command can specify a value
           for its -id argument that does not match their local UID on the NFS/AFS translator machine.

       •   To control whether users can create mounts in the non-AFS filespace to an AFS directory other than
           /afs, use the -submounts argument.

OPTIONS

       -type <exporter name>
           Names the alternate file system to which to reexport the AFS filespace. The only acceptable value is
           "nfs", in lowercase letters only.

       -start on =item -start off
           Enables the local machine to reexport the AFS filespace if the value is "on", or disables it if the
           value is "off". Omit this argument to report the current setting for all of the configurable
           parameters.

       -convert on =item -convert off
           Controls the setting of the UNIX group and other mode bits on AFS files and directories exported to
           the non-AFS file system. If the value is "on", they are set to match the owner mode bits. If the
           value is "off", the bits are not changed. If this argument is omitted, the default value is "on".

       -uidcheck on =item -uidcheck off
           Controls whether tokens can be placed in a credential structure identified by a UID that differs from
           the local UID of the entity that is placing the tokens in the structure.

           •   If the value is on, the UID that identifies the credential structure must match the local UID.

               With respect to the knfs command, this value means that the value of -id argument must match the
               issuer's local UID on the translator machine. In practice, this setting makes it pointless to
               include the -id argument to the knfs command, because the only acceptable value (the issuer's
               local UID) is already used when the -id argument is omitted.

               Enabling UID checking also makes it impossible to issue the klog and pagsh commands on a client
               machine of the non-AFS file system even though it is a system type supported by AFS. For an
               explanation, see klog(1).

           •   If the value is off (the default), tokens can be assigned to a local UID in the non-AFS file
               system that does not match the local UID of the entity assigning the tokens.

               With respect to the knfs command, it means that the issuer can use the -id argument to assign
               tokens to a local UID on the NFS client machine that does not match his or her local UID on the
               translator machine. (An example is assigning tokens to the MFS client machine's local superuser
               "root".) This setting allows more than one issuer of the knfs command to make tokens available to
               the same user on the NFS client machine. Each time a different user issues the knfs command with
               the same value for the -id argument, that user's tokens overwrite the existing ones. This can
               result in unpredictable access for the user on the NFS client machine.

       -submounts on =item -submounts off
           Controls whether a user of the non-AFS filesystem can mount any directory in the AFS filespace other
           than the top-level /afs directory. If the value is "on", such submounts are allowed. If the value is
           "off", only mounts of the /afs directory are allowed. If this argument is omitted, the default value
           is "off".

       -help
           Prints the online help for this command. All other valid options are ignored.

OUTPUT

       If the machine is not even configured as a server of the non-AFS file system, the following message
       appears:

          Sorry, the <file_system>-exporter type is currently not supported on
          this AFS client

       If the machine is configured as a server of the non-AFS file system but is not currently enabled to
       reexport AFS to it (because the -start argument to this command is not set to "on"), the message is as
       follows:

          '<file_system>' translator is disabled

       If the machine is enabled to reexport AFS, the following message precedes messages that report the
       settings of the other parameters.

          '<file_system>' translator is enabled with the following options:

       The following messages indicate that the -convert argument is set to "on" or "off" respectively:

          Running in convert owner mode bits to world/other mode
          Running in strict unix mode

       The following messages indicate that the -uidcheck argument is set to "on" or "off" respectively:

          Running in strict 'passwd sync' mode
          Running in no 'passwd sync' mode

       The following messages indicate that the -submounts argument is set to "on" or "off" respectively:

          Allow mounts of /afs/.. subdirs
          Only mounts to /afs allowed

EXAMPLES

       The following example shows that the local machine can export AFS to NFS client machines.

          % fs exportafs nfs
          'nfs' translator is enabled with the following options:
               Running in convert owner mode bits to world/other mode
               Running in no 'passwd sync' mode
               Only mounts to /afs allowed

       The following example enables the machine as an NFS server and converts the UNIX group and other mode
       bits on exported AFS directories and files to match the UNIX owner mode bits.

          % fs exportafs -type nfs -start on -convert on

       The following example disables the machine from reexporting AFS to NFS client machines:

          % fs exportafs -type nfs -start off

PRIVILEGE REQUIRED

       The issuer must be logged in as the local superuser root.

SEE ALSO

       klog(1), knfs(1)

       IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.  It was converted from HTML to POD
       by software written by Chas Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth
       Cassell.