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.\" ========================================================================
.\"
.IX Title "IC_MOD_PERL 1p"
.TH IC_MOD_PERL 1p "2016-08-31" "perl v5.22.2" "User Contributed Perl Documentation"
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.SH "NAME"
ic_mod_perl \-\- Run Interchange entirely inside Apache/mod_perl
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 10
\& # Add to Apache httpd.conf:
\& PerlRequire /usr/lib/interchange/bin/ic_mod_perl
\& PerlChildInitHandler Vend::ModPerl::child_start
\& PerlChildExitHandler Vend::ModPerl::child_end
\&
\& SetHandler perl\-script
\& PerlHandler Vend::ModPerl
\& PerlSendHeader Off
\& PerlSetupEnv On
\&
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
.SS "Benefits"
.IX Subsection "Benefits"
.IP "\(bu" 4
Possibly better stability, especially on non-Linux platforms where
Perl signals are often buggy.
.IP "\(bu" 4
Use less memory total; don't have preforked Apache \fIand\fR Interchange
daemons. Adds about 8 \s-1MB\s0 more to a typical Apache/mod_perl child process,
for a total of, say, 32 \s-1MB\s0 per Apache child process. But standalone
Interchange usually has 3 processes: an Interchange child process (~24
\&\s-1MB\s0), an httpd child (~24 \s-1MB\s0), \fIand\fR a link \s-1CGI \s0(~1 \s-1MB\s0), so it's
actually a decent savings in total memory used.
.IP "\(bu" 4
Speed (ranging from slightly faster to the same on heavy pages,
to 10 hits/sec. faster on empty pages).
.IP "\(bu" 4
Debugging \*(-- delve into bowels with Apache::Status.
.IP "\(bu" 4
Easier coexistence with other mod_perl code and libraries.
.IP "\(bu" 4
Can coexist with standalone Interchange codebase without problems.
.IP "\(bu" 4
Administrative ease (for sysadmins who know Apache but not Interchange).
.SS "Drawbacks"
.IX Subsection "Drawbacks"
.IP "\(bu" 4
Interchange runs as web server user, which in a standard system is usually
apache or www, so you wouldn't want to share that Apache installation
with untrusted user CGIs, \s-1PHP,\s0 etc. as they could read any Interchange
files, including DSNs, userdb, etc.
.IP "\(bu" 4
Apache needs to be dedicated, or very closely watched because all
mod_perl stuff runs in the same interpreter, and lots of mod_perl code
doesn't use Safe.
.IP "\(bu" 4
How do you scale to multiple app servers in this configuration?
.RS 4
.IP "\(bu" 4
Hardware or software port redirector
.IP "\(bu" 4
Tux \s-1CGI\s0 front-end redirector like tlink
.IP "\(bu" 4
Separate lightweight Apache (no modules) that proxies /ic requests
.RE
.RS 4
.RE
.SS "Ideal system setup"
.IX Subsection "Ideal system setup"
Use Tux to serve images & static content, and a dedicated Apache for
Interchange running under the 'interch' user and with no UserDir, \s-1CGI,
PHP,\s0 etc. enabled and an empty DocRoot.
.SH "CAVEATS"
.IX Header "CAVEATS"
.IP "\(bu" 4
Watch out for differing Storable versions in sessions when switching
between standalone and mod_perl runs!
.SH "BUGS"
.IX Header "BUGS"
.IP "\(bu" 4
Haven't yet implemented form/multipart submissions.
.IP "\(bu" 4
Don't yet handle TolerateGet.
.IP "\(bu" 4
Don't yet handle MiniVend 3 style GETs (mv_session_id;mv_arg;mv_pc)
.IP "\(bu" 4
URIs must follow format \f(CW\*(C`/ic/catalogname/page...\*(C'\fR, where /ic is
customizable but must only be one \*(L"directory\*(R" deep (i.e., no
slashes).
.SH "AUTHOR"
.IX Header "AUTHOR"
Jon Jensen , March 2002