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``profile::nfs_server``
=======================
This module manages the Linux kernel NFS server and configures the exports.
See `Implementation Notes`_ below for details.
Parameters
----------
=============================== ======== ================================================
**Name** **Type** **Default**
------------------------------- -------- ------------------------------------------------
exports hash hiera('nfs_server::exports')
=============================== ======== ================================================
``exports``
~~~~~~~~~~~
A hash containing the NFS exports to be configured. The keys are the pathnames
to be exported, the values are hashes with two attributes:
- ``options``: the default options for the export
- ``clients``: a list of hashes describing the clients
The hashes describing the clients have two entries as well, the second one being
optional:
- ``hosts``: a client specification as described in :manpage:`exports(5)`
- ``options`` (optional): an option string specific to these clients
Example::
nfs_server::exports:
# Make software available via NFS. Installation happens
# on builder.psi.ch.
'/exports/prog':
options: 'ro,root_squash'
clients:
- hosts: '129.129.0.0/16'
- hosts: 'builder.psi.ch'
options: 'rw,no_root_squash'
# Scratch directories for prod servers. Files on scratch
# are cleaned up by a cron job on janitor.psi.ch.
'/exports/scratch':
options: 'rw,root_squash'
clients:
- hosts: '129.129.160.0/24'
- hosts: '129.129.190.0/24'
- hosts: 'janitor.psi.ch'
options: 'no_root_squash'
Implementation Notes
--------------------
We pass ``--manage-gids`` to :manpage:`rpc.mountd(8)` to avoid the following
problem. When not using Kerberos, the NFS client passes a list of groups (GIDs
really) that the user is a member of, and the server consults this list when
making access decisions. The client can pass at most 16 groups, which means that
if a user is a member of more than 16 groups, they may be denied access even
though they are a member of the necessary group.
One solution is to use Kerberos, the other is to have the server determine group
membership itself, ignoring the client's list. The latter is what
``--manage-gids`` does.