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distributed computing environment wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 history 2 architecture 3 references 4 external links toggle the table of contents distributed computing environment 12 languages deutsch español français magyar italiano 日本語 한국어 nederlands norsk bokmål polski русский 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia client server computer framework this article needs more citations please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources distributed computing environment news newspapers books scholar jstor december 2011 learn how and when to remove this message the distributed computing environment dce is a software system developed in the early 1990s from the work of the open software foundation osf a consortium founded in 1988 that included apollo computer part of hewlett packard from 1989 ibm digital equipment corporation and others 1 2 the dce supplies a framework and a toolkit for developing client server applications 3 the framework includes a remote procedure call rpc mechanism 4 known as dce rpc a naming directory service 4 a time service 4 an authentication service 4 a distributed file system dfs 4 known as dce dfs the dce did not achieve commercial success as of 1995 all major computer hardware vendors had an implementation of dce seen as an advantage compared to alternatives like corba which all had more limited support 4 13 history edit as part of the formation of osf various members contributed many of their ongoing research projects as well as their commercial products for example hp apollo contributed its network computing environment ncs and cma threads products siemens nixdorf contributed its x 500 server and asn 1 compiler tools at the time network computing was quite popular and many of the companies involved were working on similar rpc based systems by integrating security rpc and other distributed services on a single distributed computing environment osf could offer a major advantage over svr4 allowing any dce supporting system namely osf 1 to interoperate in a larger network the dce request for technology was issued by the osf in 1989 the first osf dce vendor product came out in 1992 4 3 the dce system was to a large degree based on independent developments made by each of the partners dce rpc was derived from the network computing system ncs created at apollo computer the naming service was derived from work done at digital dce dfs was based on the andrew file system afs originally developed at carnegie mellon university the authentication system was based on kerberos by combining these features dce offers a fairly complete system for network computing any machine on the network can authenticate its users gain access to resources and call them remotely using a single integrated api the rise of the internet java and web services stole much of dce s mindshare through the mid to late 1990s and competing systems such as corba appeared as well one of the major uses of dce today is microsoft s dcom and odbc systems which use dce rpc in msrpc as their network transport layer citation needed osf and its projects eventually became part of the open group which released dce 1 2 2 under a free software license the lgpl on 12 january 2005 5 6 dce 1 1 was available much earlier under the osf bsd license and resulted in freedce being available since 2000 freedce contains an implementation of dcom 7 one of the major systems built on top of dce was encina developed by transarc later acquired by ibm ibm used encina as a foundation to port its primary mainframe transaction processing system cics to non mainframe platforms as ibm txseries however later versions of txseries have removed the encina component architecture edit dce is intended to support high availability systems when a server does not respond because of server failure or communications failure clients can be constructed to automatically use a replica of that server instead 4 11 21 the largest unit of management in dce is a cell the highest privileges within a cell are assigned to a role called cell administrator normally assigned to the user cell_admin multiple cells can be configured to communicate and share resources with each other all principals from external cells are treated as foreign users and privileges can be awarded or removed accordingly in addition to this specific users or groups can be assigned privileges on any dce resource something which is not possible with the traditional unix filesystem which lacks acl s major components of dce within every cell are the security server that is responsible for authentication the cell directory server cds that is the repository of resources and acls and the distributed time server that provides an accurate clock for proper functioning of the entire cell modern dce implementations such as ibm s are fully capable of interoperating with kerberos as the security server ldap for the cds and the network time protocol implementations for the time server dce dfs is a dce based application which provides a distributed filesystem on dce dce dfs can support replicas of a fileset the dce dfs equivalent of a filesystem on multiple dfs servers there is one read write copy and zero or more read only copies replication is supported between the read write and the read only copies in addition dce dfs also supports what are called backup filesets which if defined for a fileset are capable of storing a version of the fileset as it was prior to the last replication dce dfs is believed to be the world s only distributed filesystem that correctly implements the full posix filesystem semantics including byte range locking 7 dce dfs was sufficiently reliable and stable to be utilised by ibm to run the back end filesystem for the 1996 olympics web site seamlessly and automatically distributed and edited worldwide in different time zones 7 references edit weijia jia wanlei zhou 15 december 2004 distributed network systems from concepts to implementations springer science business media p 135 isbn 978 0 387 23839 5 pradeep k sinha 1 january 1998 distributed operating systems concepts and design phi learning pvt ltd p 35 isbn 978 81 203 1380 4 hans arno jacobsen 30 november 2003 distributed infrastructure support for electronic commerce applications springer science business media p 14 isbn 978 1 4020 7648 0 1 2 3 4 5 6 7 8 j mansfield and j clothier distributed computing environment an architecture for supporting change 1995 dce open source licensing 2005 dce to be released under the lgpl 2005 1 2 3 the open group releases dce 1 2 2 as lgpl d free software external links edit the open group s dce portal v t e standards by the open group archimate arm cde cli cmpi dce drda face ldap motif o ism3 o pas o ttps sus posix togaf udef x open xa x11 retrieved from https en wikipedia org w index php title distributed_computing_environment oldid 1364964721 categories inter process communication internet protocol based network software open group standards distributed computing hidden categories articles with short description short description is different from wikidata articles needing additional references from december 2011 all articles needing additional references all articles with unsourced statements articles with unsourced statements from december 2023 this page was last edited on 19 july 2026 at 14 54 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents distributed computing environment 12 languages add topic