"One of the biggest problems with administering a major
server housing multiple sites is restricting access to the sites to
only those people responsible for maintaining a specific site.
The reason for this is that all of the Apache child processes run
with the same user and group Id. Therefore, all of the files need
to be readable, writable, and executable by the user and group that
the server is running as. This becomes a much bigger issue when you
add CGI and PHP scripts to the site. If those scripts must access
private information, then that information must be stored with
relatively insecure user and group Ids."
"Apache 1.3 solved this problem by introducing suexec,
which introduces other problems and PHP and mod_cgi can not take
advantage of it. Apache 2.0 has introduced a new MPM to solve
this problem in a more elegant way that all scripts can take
"The new MPM is called Perchild, and it is based on the
Dexter MPM. This means that a set number of child processes are
created and each process has a dynamic number of threads. In this
MPM it is possible to specify User and Group IDs for clusters of
child process. Then, each virtual host is assigned to run in a
specific cluster of child processes. If no cluster of child
processes is specified, then the virtual host is run with the
default User and Group Ids."
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