There are several projects that offer precompiled and portable distributions of the Apache webserver for use on a USB stick. But I couldn't find any that would work on a Linux system.
Today I spent some time to figure out how to compile a relocatable Apache with PHP support. Yes, this might result in a Linux version of the DokuWiki on a Stick project. Read on for detailed instructions.
I assume all of the following steps are done in your home directory, adjust paths if needed.
$> wget http://de2.php.net/get/php-5.2.5.tar.bz2/from/this/mirror $> tar -xjvf php-5.2.5.tar.bz2 $> wget http://apache.eu.lucid.dk/httpd/httpd-2.0.63.tar.bz2 $> tar -xjvf httpd-2.0.63.tar.bz2
$> cd $HOME/httpd-2.0.63 $> patch < $HOME/apache-2.0.63.patch
Time to compile Apache and PHP. Apache goes first:
$> cd $HOME/httpd-2.0.63 $> ./configure --prefix=$HOME/apache --exec-prefix=$HOME/apache \\ --enable-mods-shared=all --enable-so $> make $> make install
Next is PHP:
$> cd $HOME/php-5.2.5 $> ./configure --prefix=$HOME/php --with-apxs2=$HOME/apache/bin/apxs $> make $> make install
The first part is pretty straight forward. Just create a dir and copy the files we're interested in.
$> mkdir $HOME/portable $> cd $HOME/portable $> mkdir conf $> mkdir htdocs $> mkdir logs $> cp $HOME/apache/bin/httpd . $> cp $HOME/apache/lib/libapr-0.so.0 . $> cp $HOME/apache/lib/libaprutil-0.so.0 . $> cp -r $HOME/apache/modules/ . $> cp $HOME/conf/mime.types conf/ $> cp $HOME/php-5.2.5/php.ini-recommended conf/php.ini
The next thing took me a lot of time to figure out. The httpd binary makes use of some shared libraries. The location (rpath) of these libraries is compiled into the binary. That's bad of course for a portable environment. Luckily the dynamic loader of Linux supports a macro called
$ORIGIN to reference a path relative to the binary itself. However I wasn't able to pass
$ORIGIN correctly to the
LDFLAGS environment to be used correctly by the Apache build process2).
The only way to fix this problem I found, was to change the rpath afterwards. This can be done by a tool called chrpath:
$> sudo apt-get install chrpath $> chrpath -r '$ORIGIN' $HOME/portable/httpd
Finally a simple config file for Apache is needed, here is a very minimal version of
ServerName portableapache Listen 8080 DocumentRoot htdocs ServerAdmin email@example.com LoadModule access_module modules/mod_access.so LoadModule autoindex_module modules/mod_autoindex.so LoadModule dir_module modules/mod_dir.so LoadModule mime_module modules/mod_mime.so LoadModule php5_module modules/libphp5.so AddType application/x-httpd-php .php .php3 PHPIniDir conf AccessFileName .htaccess IndexIgnore readme .htaccess KeepAlive on KeepAliveTimeout 15 TimeOut 30 DirectoryIndex index.html index.htm index.php
You now can start and stop your Apache with
$> cd $HOME/portable $> ./httpd -k start $> ./httpd -k stop
Of course you might want to move the
$HOME/portable dir to your USB stick. The webserver will be available at