It appears that latest php version 5.1.6-20.el5_2.1 under RHEL / CentOS Linux v5.2 has made some major changes. As a result choort jail setup using previous instructions no longer works. PHP is crashing with segmentation fault errors. So I had to trace php errors using strace command.
Postfix MTA updated to fix security vulnerabilities such as incorrectly checks the ownership of a mailbox. In some configurations, this allows for appending data to arbitrary files as root. This update has been rated as having moderate security impact.
CentOS Linux 5.2 has been released and available for immediate update via yum command. You can also download DVD / ISO images.
Recently updated/posted Linux and UNIX FAQ (mostly useful to Linux/UNIX new administrators or users) : Update Fedora 7 Linux OpenBSD install BASH shell package Star / Stop FTP server on FreeBSD / OpenBSD How to install Linux / UNIX *.tar.gz tarball files Install Language support in CentOS 5 or Red Hat Enterprise Linux Display or [...]
You should always aware of maximum amount of memory and maximum number of CPU supported by Linux systems / server.
This is an essential task for making out decisions. You must consider at least AMD and Intel platforms, tested under RHEL 5 only: