dacs.vfs

DACS.VFS(5)                   DACS Formats Manual                  DACS.VFS(5)



NAME
       dacs.vfs - the DACS virtual filestore

DESCRIPTION
       These files are part of the DACS suite.

       The virtual filestore provides flexible ways for DACS and software
       built on top of DACS to obtain information regardless of how or where
       the information is stored. The DACS core accesses (almost) all
       configuration information through the virtual filestore layer, allowing
       information to be more easily shared and maintained, secured, or
       organized for better performance.

       Sometimes it is easiest to store information in a regular file
       initially, where it can be modified using an ordinary text editor, but
       after some growth a database might improve performance. In some
       situations, accessing the information remotely, via HTTP, makes
       administration more convenient or is more secure. A goal of the virtual
       filestore is to make it simple to make configuration choices
       appropriate to a particular DACS environment, and to change them as
       required. Consult dacsvfs(1)[1] for additional information.

       For example, the account file used by dacspasswd(1)[2] and other
       components is accessed from within DACS through the name passwds (a
       string called an item type). The DACS configuration in effect
       determines how this is mapped to an object that contains the account
       information, how an individual account name is looked up, and where the
       object is located.

       Each virtual filestore instance maps to either an uninterpreted
       sequence of bytes (e.g., a Unix file or the output of a program) or an
       object that contains zero or more items, each of which is associated
       with a key (i.e., the name of an item relative in its virtual filestore
       context) and has an uninterpreted sequence of bytes as its value (e.g.,
       a database file, a Unix file containing lines having a particular
       keyword/value structure, or a directory containing regular files).

       The VFS[3] directive is used to specify where and how information is
       stored. Some commands and functions take a VFS specification as an
       argument to provide a default or override a default.

       For maximum portability, a key should be composed of characters from
       the Portable Filename Character Set[4]: any alphanumeric character,
       period, hyphen, or underscore. The true limitation on the character set
       depends on the underlying storage scheme and URI syntax constraints.
       There is no a priori limit on naming context or key length.

SEE ALSO
       dacsvfs(1)[1], dacs.conf(5)[5], dacs.install(7)[6], dacs_vfs(8)[7]

BUGS
AUTHOR
       Distributed Systems Software (www.dss.ca[8])

COPYING
       Copyright2003-2012 Distributed Systems Software. See the LICENSE[9]
       file that accompanies the distribution for licensing information.

NOTES
        1. dacsvfs(1)
           http://dacs.dss.ca/man/dacsvfs.1.html

        2. dacspasswd(1)
           http://dacs.dss.ca/man/dacspasswd.1.html

        3. VFS
           http://dacs.dss.ca/man/dacs.conf.5.html#VFS

        4. Portable Filename Character Set
           http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276

        5. dacs.conf(5)
           http://dacs.dss.ca/man/dacs.conf.5.html

        6. dacs.install(7)
           http://dacs.dss.ca/man/dacs.install.7.html

        7. dacs_vfs(8)
           http://dacs.dss.ca/man/dacs_vfs.8.html

        8. www.dss.ca
           http://www.dss.ca

        9. LICENSE
           http://dacs.dss.ca/man/../misc/LICENSE



DACS 1.4.28b                      02/04/2014                       DACS.VFS(5)