[Zope] High Traffic Zope Portal

[Jeronimo Zucco]

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We use zope with the following environment:
- - Zope 2.7.4-0
- - ZCoMIX-1.0.2+ (http://sourceforge.net/projects/zcomix)
- - mysqlUserFolder 1.0.0
- - python 2.3.4
- - Red Hat Enterprise Linux ES release 2.1, kernel 2.6.11, ext2 fs
- - MySQL-server-4.0.20
- - Apache 2.0.50 (with HTTPS) for cache

1 Portal replicated through Zeo and balanced with DNS Round Robin.

Hardware:
2 Servers HP ML350 G4 with Dual Intel Xeon 2.80GHz, 3Gb of Memory,
without RAID, SCSI U320 with 4 disks 120gb.

We posted a dynamic document for the students (35.000). The document is
generated using queries in MySql database, after user autentication
using mysqluserfolder.

The python processes occupied 100% of machines resources (cpu and
memory), and the load average increased quickly. We evidenced that the
problems had occurred before user authentication, only trying access the
initial page of the Zope portal.

We estimated that the simultaneous accesses to our portal are
approximately 10000 people in a moment, that finished generating a DoS
(Denial of Service) in our portal.

To resolve the problem momentarily, we posted static documents in PHP,
without Zope.

Have someone experience in sites of great traffic using Zope? If so,
please give us some tip for tunning the system or discover the
bootleneck points.

We have doubts if what it is generating the problem is the ZCoMIX or the
Zope, or even though the configuration of Apache.

- --
Jeronimo Zucco
LPIC-1 Linux Professional Institute Certified
Núcleo de Processamento de Dados
Universidade de Caxias do Sul

"May the Source be with you." - An unknown jedi programmer.

http://jczucco.blogspot.com

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