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NAME
fns_policies - overview of the FNS Policies
DESCRIPTION
FNS defines policies for naming objects in the federated
namespace. The goal of these policies is to allow easy and
uniform composition of names. The policies use the basic
rule that objects with narrower scopes are named relative to
objects with wider scopes.
FNS policies are described in terms of the following three
categories: global, enterprise, and application.
Global naming service
A global naming service is a naming service that has
world-wide scope. Internet DNS and X.500 are examples
of global naming services. The types of objects named
at this global level are typically countries, states,
provinces, cities, companies, universities, institu-
tions, and government departments and ministries.
These entities are referred to as enterprises.
Enterprise-level naming service
Enterprise-level naming services are used to name
objects within an enterprise. Within an enterprise,
there are naming services that provide contexts for
naming common entities such as
organizational units, physical sites, human users,
and computers. Enterprise-level naming services are
bound below the global naming services. Global naming
services provide contexts in which the root contexts
of enterprise-level naming services can be bound.
Application-level naming service
Application-level naming services are incorporated in
applications offering services such as file service,
mail service, print service, and so on. Application-
level naming services are bound below enterprise nam-
ing services. The enterprise-level naming services
provide contexts in which contexts of application-
level naming services can be bound.
FNS has policies for global and enterprise naming. Naming
within applications is left to individual applications or
groups of related applications and not specified by FNS.
FNS policy specifies that DNS and X.500 are global naming
services that are used to name enterprises. The global
namespace is named using the name .... A DNS name or an
X.500 name can appear after the .... Support for federating
global naming services is planned for a future release of
FNS.
Within an enterprise, there are namespaces for organiza-
tional units, sites, hosts, users, files and services,
referred to by the names orgunit, site, host, user, fs, and
service. In addition, these namespaces can be named using
these names with an added underscore ('_') prefix (for exam-
ple, host and _host have the same binding). The following
table summarizes the FNS policies.
_______________________________________________________________
| Context | Subordinate | Parent |
| Type | Context | Context |
| org unit | site | enterprise root |
| | user | |
| | host | |
| | file system | |
| | service | |
| site | user | enterprise root |
| | host | org unit |
| | file system | |
| | service | |
| user | service | enterprise root |
| | file system | org unit |
| host | service | enterprise root |
| | file system | org unit |
| service | not specified | enterprise root |
| | | org unit |
| | | site |
| | | user |
| | | host |
| file system | none | enterprise root |
| | | org unit |
| | | site |
| | | user |
| | | host |
|____________________|____________________|____________________|
In Solaris, an organizational unit name corresponds to an
NIS+ domain name and is identified using either the fully-
qualified form of its NIS+ domain name, or its NIS+ domain
name relative
to the NIS+ root. Fully-qualified NIS+ domain names have a
terminal dot ('.'). For example, assume that the NIS+ root
domain is "Wiz.COM." and "sales" is a subdomain of that.
Then, the names org/sales.Wiz.COM. and org/sales both refer
to the organizational unit corresponding to the same NIS+
domain sales.Wiz.COM.
User names correspond to names in the corresponding NIS+
passwd.org_dir table. The file system context associated
with a user is obtained from his entry in the NIS+
passwd.org_dir table.
Host names correspond to names in the corresponding NIS+
hosts.org_dir table. The file system context associated with
a host corresponds to the files systems exported by the
host.
EXAMPLES
Example 1: The types of objects that may be named relative
to an organizational unit name are: user, host, service,
file, and site. Here are some examples of names name
objects relative to organizational unit names:
org/accounts_payable.finance/site/videoconference.northwing
names a conference room videoconference located in
the north wing of the site associated with the organ-
izational unit accounts_payable.finance.
org/finance/user/mjones
names a user mjones in the organizational unit
finance.
org/finance/host/inmail
names a machine inmail belonging to the organiza-
tional unit finance.
org/accounts_payable.finance/fs/pub/blue-and-whites/FY92-124
names a file pub/blue-and-whites/FY92-124 belonging
to the organizational unit accounts_payable.finance.
org/accounts_payable.finance/service/calendar
names the calendar service of the organizational unit
accounts_payable.finance. This might manage the
meeting schedules of the organizational unit.
Example 2: The types of objects that may be named relative
to a site name are services and files. Here are some exam-
ples of names that name objects relative to sites:
site/b5.mtv/service/printer/speedy
names a printer speedy in the b5.mtv site.
site/admin/fs/usr/dist
names a file directory usr/dist available in the site
admin.
Example 3: The types of objects that may be named relative
to a user name are services and files. Here are some exam-
ples of names that name objects relative to users:
user/jsmith/service/calendar
names the
calendar service of the user jsmith.
user/jsmith/fs/bin/games/riddles
names the file bin/games/riddles of the user jsmith.
Example 4: The types of objects that may be named relative
to a host name are services and files. Here are some exam-
ples of names that name objects relative to hosts:
host/mailhop/service/mailbox
names the
mailbox service associated with the machine mailhop.
host/mailhop/fs/pub/saf/archives.91
names the directory pub/saf/archives.91 found under
the root directory of the machine mailhop.
SEE ALSO
fncreate(1M), nis+(1), xfn(3XFN), fns(5),
fns_initial_context(5), fns_references(5)
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