a new architecture for web services at cern alberto di meglio, francois fluckiger, monica marinucci,...
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A New Architecture for A New Architecture for Web Services at CERNWeb Services at CERN
Alberto Di Meglio, Francois Fluckiger, Monica Marinucci, Per Hagen, Alberto Pace
http://cern.ch/web
A New Architecture for Web Services at CERN – CHEP, February 2000
Part 1 of 2Part 1 of 2
The new Web Namespace Review of new Services
A New Architecture for Web Services at CERN – CHEP, February 2000
Today’s namespaceToday’s namespace
http://www.cern.ch/… http://wwwinfo.cern.ch/… http://network.cern.ch/… http://home.cern.ch/… http://nicewww.cern.ch/… http://wwwas.cern.ch/… …
A New Architecture for Web Services at CERN – CHEP, February 2000
Is there a problem ?Is there a problem ?
A New Architecture for Web Services at CERN – CHEP, February 2000
Is there a problem ?Is there a problem ?
A New Architecture for Web Services at CERN – CHEP, February 2000
From the MAIL architectureFrom the MAIL architecture
[email protected] [email protected]
Generic address Physical address
Global namespace domain
Physical Mail Server name
Translation Service
Mailbox name
A New Architecture for Web Services at CERN – CHEP, February 2000
The same for the WEBThe same for the WEB
http://cern.ch/SiteName http://host.cern.ch/path
Generic address Physical address
Global namespacedomainPhysical Web Server name
Translation / Redirection Service
Site Name
A New Architecture for Web Services at CERN – CHEP, February 2000
[email protected] http://cern.ch/alberto.pace
Complete Duality Mail - WebComplete Duality Mail - Web
[email protected] http://cern.ch/it-div
Mail address and mailing lists Web address
[email protected] http://cern.ch/aleph-exp
Organisational Units
Individuals addresses and personal files
A New Architecture for Web Services at CERN – CHEP, February 2000
Mail “Mail Composing” tools are unable to find the physical
server name from the generic address [email protected] given a user’s mailbox “xxxx”, the host
“xxxx.mailbox.cern.ch” represents the server hosting the xxxx mailbox
Web “Web Authoring” tools are unable to find the physical
server name from the generic address http://cern.ch/xxxx given a sitename “xxxx”, the host “xxxx.web.cern.ch”
represents the server hosting the xxxx site
… … more duality …more duality …
http://xxxx.web.cern.ch/xxxx
A New Architecture for Web Services at CERN – CHEP, February 2000
Not limited to Central ServersNot limited to Central Servers
MAIL: “Generic E-mail Addresses” ([email protected]) can point to locally managed mail servers or even to servers outside CERN
WEB: “Generic URL Addresses” (http://cern.ch/xxx) can point to locally managed web servers or even to servers outside CERN
A New Architecture for Web Services at CERN – CHEP, February 2000
What about www.cern.ch ?What about www.cern.ch ?
http://www.cern.ch and http://cern.ch are equivalent Users preferring the www.cern.ch syntax can use it,
the leading www. being optional.
A New Architecture for Web Services at CERN – CHEP, February 2000
Will we still have broken links ?Will we still have broken links ?
The new web redirector supports site aliasing Multiple / different names can be mapped to the same
physical site We can have:
Old names pointing to new names http://cern.ch/cn-div -> http://cern.ch/it-div
Descriptive names pointing to real nameshttp://cern.ch/it.division -> http://cern.ch/it-divhttp://cern.ch/Alberto.Pace -> http://cern.ch/pace
Site nicknames, easier to typehttp://cern.ch/it -> http://cern.ch/it-div
Existing hosts can be ‘taken over’ by the central redirector http://mysite.cern.ch/ -> http://cern.ch/mysite
A New Architecture for Web Services at CERN – CHEP, February 2000
100 % compatible with the 100 % compatible with the existing infrastructureexisting infrastructure
Existing servers integrates smoothly in the namespace
No broken links / No HTML to modify The Web namespace becomes independent from the
physical server layout and it allows the evolution of the existing infrastructure
A New Architecture for Web Services at CERN – CHEP, February 2000
DEMODEMO
You can access the CERN Scuba club site using any of the following URLs: http://cern.ch/subaqua http://www.cern.ch/subaqua http://web.cern.ch/subaqua http://subaqua.cern.ch http://subaqua.web.cern.ch http://subaqua.web.cern.ch/subaqua
As in the browser, the prefix http://and the domain name cern.ch can be omitted, a CERN user can simply type “subaqua” to access the site
A New Architecture for Web Services at CERN – CHEP, February 2000
Part 2 of 2Part 2 of 2
The new Web Namespace Review of new Services
A New Architecture for Web Services at CERN – CHEP, February 2000
With the new web namespace …With the new web namespace …
We are no longer bound to the “all in one server” architecture.
We can differentiate Server OS, Web Server software, File Storage and support multiple solutions if necessary.
We can go beyond simple static HTML authoring and open a wide set of new services … (as described in the next slides)
A New Architecture for Web Services at CERN – CHEP, February 2000
Site HostingSite Hosting
Site hosting means offering disk space to store web files and then make them available via http
Based on a pool of (cheap) servers to host web sites of customer who do not want to maintain their own server Load balanced using the web.cern.ch subdomain
Every web site has one (and only one) owner responsible for the site content who can manage or delegate the site security
A New Architecture for Web Services at CERN – CHEP, February 2000
Site HostingSite Hosting
Sites can be physically stored on Central Web servers AFS NICE (locally managed servers)
Flat Namespace (part of the CERN web namespace) http://(www.)cern.ch/sitename
Subsites are possible but managed by owners of upper sites http://cern.ch/mainsite/subsite1
subsite1 is managed by the owner of mainsite
A New Architecture for Web Services at CERN – CHEP, February 2000
Authoring interfacesAuthoring interfaces
Authoring interfaces (sites on the Central Web Servers) HTTP (PUT method)
http://sitename.web.cern.ch/sitename FTP
ftp://sitename.web.cern.ch/sitename ftp://[email protected]/sitename
OSE = Microsoft Office Server ExtensionsSee http://www.microsoft.com/office/ork
DAV = Distributed Authoring and Versioning (Foreseen) See http://www.w3c.org
A New Architecture for Web Services at CERN – CHEP, February 2000
DEMODEMO
A New Architecture for Web Services at CERN – CHEP, February 2000
What’s the difference ?What’s the difference ?
A New Architecture for Web Services at CERN – CHEP, February 2000
Site Registration ServicesSite Registration Services
Automated Site Registration and Creation Service Users can create/delete web sites or registrations
themselves A moderator authority supervises all actions Users are authenticated on AFS or NICE and site
ownership is always checked
A New Architecture for Web Services at CERN – CHEP, February 2000
Support for Authoring ToolsSupport for Authoring Tools
Site management & page editing tools Microsoft FrontPage Macromedia Dreamweaver
Page editing tools Netscape Composer Other Microsoft Office Applications (Word, Excel,
PowerPoint, Access, …)
A New Architecture for Web Services at CERN – CHEP, February 2000
More ServicesMore Services
Forms All sites in the central web servers are form-ready Users can create electronic forms themselves
Databases All central web pages can be connected to databases Databases can be local “Access” files or remote Oracle Read and Write access
Search services Both client-side (infoseek) and server-side indexing Complementary services
A New Architecture for Web Services at CERN – CHEP, February 2000
More services (2)More services (2)
Access Control ACL, IP address restrictions, external authentication,
password protected documents, … Secure connections (HTTPS, SSL)
Available on all central sites by default Cascading Styles Sheets (CSS) and Themes
We have now the necessary tools to make available Corporate / Divisional look and feel policies
Document Source Control For sites authored by multiple persons
A New Architecture for Web Services at CERN – CHEP, February 2000
CGI-Interface and ScriptingCGI-Interface and Scripting
Every site on the central servers has a cgi-bin directory Standard CGI-Interface fully supported Scripting
Supported interpreters: *.PL (Perl) and *.ASP (Active Server Pages).
Supported languages for ASP: Vbscript, Jscript and PerlScript.
A New Architecture for Web Services at CERN – CHEP, February 2000
ConclusionConclusion
The new namespace gives us independence from the physical infrastructure and allows us to move forward
An important set of pending requirements for the web services will be addressed with the new architecture
For more information …
A New Architecture for Web Services at CERN – CHEP, February 2000
http://cern.ch/web