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Zope Server Performance and Scalability
by Guy Davis 16 Feb '00

16 Feb '00

I set up a Zope 2.12 server on a PentiumPro 200 with 64MB running RH6.1 Linux. Currently I am using Apache with pcgi to handle the initial requests and MySQL for Zope's database for bug tracking and other apps. I have been asked to defend my choice of Linux over WinNT. This server will be used by approximately 50 people who will mostly make use of the document management abilities of Zope and run occasional database queries. If we assume heavy use from all 50 people, can Zope handle the loads easily? What kind of numbers (hits/second, etc.) can others report to help me back up my claim that it can? I understand that Zope is significantly slower than MS SiteServer, but for our needs is it not more than sufficient? My next question is the same but for up to 500 users. There is a small possibility that Zope may be used corporate wide rather than just for our local business units. This would likely require more serious hardware? What level? At what point does it become necessary to move to the Zope Enterprise Option? Also, what has been your experience with Zope's reliability on Linux? Has anyone been in a backup recovery situation? Was it difficult getting Zope working again from a nightly archive? This is a lot of questions but I really appreciate anyone who takes the time to answer them. -- Guy Davis mailto:davis@arc.ab.ca (403) 210-5334 Alberta Research Council

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An advice for take data
by Alessandra Pessolano 15 Feb '00

15 Feb '00

Python is installed in /usr/local/Python-1.5.2 Zope is installed in /usr/local/zope/2-1-2/ I would like to get a file.html on my browser from a Unix box I want to serve the file.html through Zope, but I don't want take it on Zope. What can I do? Is it possible? Thanks in advance for Your help

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Looking for Zope ISP with FTP access to Zserver+ZODB [Europe preferred] preferred]
by Jason Cunliffe 15 Feb '00

15 Feb '00

Hello We need a Zope ISP who can provide us with FTP access to the Zserver+ZODB, preferably based in Europe. Thanks - Jason Cunliffe ________________________________________________ Jason CUNLIFFE = Nomadics.Studio(DesignDirector) Smart_Map_Systems[design.technology.application] <jasonic(a)nomadicsltd.com> tel:+33 4 94.76.98.72

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no typos this time; modify property via form to dtml
by technology＠mylinuxisp.com 15 Feb '00

15 Feb '00

I want to modify a folder property via dtml. I am trying to submit a value via a form teststring is a folder property of the parent folder. <form action="act_dtml"> <input type="radio" name="qtype" value="value1" checked> <input type="radio" name="qtype" value="value2"> <input type="submit"> </form> dtml method <dtml-call "REQUEST.set('teststring','qtype')"> or <dtml-let teststring=qtype></dtml-let> how should I do this. technology(a)mylinuxisp.com cj

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Improve linking strategies?
by Oliver Wrede 15 Feb '00

15 Feb '00

I think link-handling for editorial staff is rather cruel in Zope! So I was thinking about a beginner-level mechanism. If I have a table (e.g. an SQL database) with Title and URL information, I'd like to replace all listed titles in a text with an URL. Example for a table: 1, "MyText", "http://www.mylink.org", NULL 2, "YourText", "http://www.yourlink.org", "<a href=\"http://www.yourlink.org\" target=\"_blank\">Other Place</a>" Example for a text: When it comes to "MyLink" ist should go to "YourLink". Destianted output: When it comes to <a href="http://www.mylink.org">MyLink</a> it should go to <a href="http://www.yourlink.org" target="_blank">Other Place</a>. What steps does a newbie like me have to take, to get this working? I can think that far: a) I may need some kind of external script written in Python b) I will have to make a list of all phrases in "..."-pairs c) I will have to do a SQL-select on each and string.replace each occurance d) I will have to be a Zope-wizard, if I want to add this functionality to existing strcutured-text formatted output.... What I can't think of yet: 1. Is this the right approach? 2. If performance will be lousy. 3. How to I get the Python beast into Zope? 4. How would the Python beast look like? Any ideas? Oliver .. Oliver Wrede .. owrede(a)khm.de .. Academy of Media Arts, Cologne .. Peter-Welter-Platz 2 . 50676 Koeln, Germany .. http://www.khm.de .. ICQ# 6580315 .. PGP 6.0 Fingerprint: .. 922C FFA2 9A07 5B8E CB2A 10A2 C370 6A62 2232 196C

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authenticated_user troubles
by Darcy Clark 15 Feb '00

15 Feb '00

I am trying to implement a mechanism to let managers edit content on a site that I am building. I have the following statement on various pages to add certain functionality to pages based on the Authenticated-users's roles: <dtml-if "AUTHENTICATED_USER.has_role(['Manager'])"> blah blah (e.g. display an edit or delete button) </dtml-if> I am currently authenticating by a login link in the standard_html_header to a DTML document that opens in a new window and can only be viewed by a Manager (I edited the security setting for this particular object so that only managers could view it). If the manager logs in correctly, a javascript closes the login window, and reloads the original page to presumably now include the editing and deleting buttons on my content....but it doesn't work. Can anyone explain to me why if the authenticated user logs in to view a particular object, then why the above snippet of code doesn't return true in other objects within the same hierachy? thanks in advance, (I suspect I am not 'grokking' something here....heh) Darcy -- --------------------------------------------------- Ph: (734) 764 3377 Email: darcyc(a)engin.umich.edu URL: http://www-personal.engin.umich.edu/~darcyc/ --------------------------------------------------- 'If you're not part of the solution, you're part of the precipitate' ..... Steven Wright

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Re. Zope Server Performance and Scalability
by Jerry.Spicklemire＠IFLYATA.COM 15 Feb '00

15 Feb '00

"This server will be used by approximately 50 people who will mostly make use of the document management abilities of Zope and run occasional database queries." I'm sure many folks will confirm that the configuration you mention will easily be adequate for 50 users. One point to watch out for is the 2 GB file size limit of current Linux (on 32 bit Intel), since the default ZODB storage is all kept in a single disk file (data.fs). As for scaling by an order of magnitude, one way to achieve higher performance is to have multiple, identical, Zope installations acting as clients to one (or more) standalone database(s), on one (or more) separate computer(s). Typically this scenario requires another separate computer acting as the load balancer, distributing requests for "URLs" among the Zope servers. This scenario can boost performance, but introduces the need for a sound synchronization process. In the simplest case you'll have a minimum of four computers, two Zope hosts, a database host, and a load balancer. The Zope and database hosts can be incremented (units can be added) as load increases, to distribute the "hits" and the growing datastore. Further, this "server farm" model itself can be incremented, by spreading Zope folders across several such "farms" of servers, with only the topmost folders common among all Zope installations. In such a case separate domain names for each "server farm" would be useful to designate the actual physical location of distributed content. Another means of "spreading out" Web content is to host certain data types (e.g. images, java script libraries, java "applets", large static HTML files), in a file system of a conventional shared file server (e.g. Samba, NFS). There are numerous methods described in user developed How-Tos on Zope.org to serve conventional (external) data "through" Zope, usually to enable "mix and match" finctionality within a Zope context. You can see there are options to explore before you will abolutely need ZEO, but you should also make sure you are aware of the added features that ZEO offers, that the above strategies lack.

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dtml-in batch processing
by Denis, Ronald J (Ronald)** CTR ** 15 Feb '00

15 Feb '00

A few dtml-in questions. I have created a query form which uses the POST method. The action points to my DTML Method. Inside my dtml-in loop, I have the following <dtml-if previous-sequence> <a href="<dtml-var URL><dtml-var sequence-query> query_start=<dtml-var previous-sequence-start-number>"> (Previous <dtml-var previous-sequence-size> results) </a> </dtml-if previous-sequence> The problem is that <dtml-var sequence-query> only works if I used the GET method in my form. Q1) Is there a way to make this work if I am using POST? The list in my <dtml-in > tag is returned from an SQL method. Q2) If I revert to using the GET method and the <a> tag lists all of the parameters, does zope rerun my SQL Method or has it stored it in cache somewhere? Thanks, Ron Denis rdenis(a)lucent.com

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Suggestions regarding two errors w/ZClass?
by kent＠tiamat.goathill.org 15 Feb '00

15 Feb '00

(Zope version: Zope 2.1.4 (binary release, python 1.5.2, solaris-2.6-sparc) ) I have a ZClass with base classes: ZObject, _ZClass_for_CatalogAware, _ZClass_for_Folder & ZObjectManager which allows me to create a tree of my ZClass instances. I would like to be able to cut and paste my ZClass instances, but when I attempt to paste :

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line continuation
by Jim Sanford 15 Feb '00

15 Feb '00

Is there any kind of line continuation character in DTML that could be used to prevent a method from returning line breaks? I have some methods that use a series of DTML tags to do something and currently I must put everything on 1 line to keep from getting unwanted line break characters in the rendered method output? Jim

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