APC  Configuration:

Once you have installed following this tutorial http://www.debian-tutorials.com/general/installing-apc-alternative-php-cache-into-php5-on-debian  you need to configure it.

APC makes use of a shared memory segment to cache php scripts. This enables multiple processes to access the cache. You can configure how massive that segment is in megabytes:

apc.shm_size=100M

By default,  APC will cache every php file requested by visitors to your website. On a typical server you will have lots of thousands of source files. So in the event you monitor the output of apc.php you will find that with time even 100MB of memory is not sufficient for APC. It will keep running  out of space as it tries to cache all the files.
To deal with this, APC will swap out old files from the cache according to this setting which specifies the time to live in seconds of files that have not been accessed recently:

apc.ttl=1300

You may prefer to cache only some of the files such as those used by the most popular websites on the server. To do that you must first set this option:

Continue Reading…

1. Install Apache 2.4 from source:

1.1 Prerequisites:

For installing Apache2.4 on Debian you need APR library. You can install this using the following command:

apt-get install libaprutil1 libaprutil1-dev

1.2  Download Apache2.4:

Download the latest version from here: http://httpd.apache.org/download.cgi#apache24
Go to /usr/src directory and download the latest version.

cd /usr/src
wget http://lnx.apollo-hw.ro/apache//httpd/httpd-2.4.1.tar.gz

1.3. Extract and Install Apache2.4:

Continue Reading…

The Apache Software Foundation officially released the Apache 2.4 today as the first major update to this leading open-source web-server in more than a half-decade. Apache 2.4 is slated to deliver superior performance to its 2.2 predecessor and better compete with the growingly-popular NGINX web-server.

Besides much faster performance, among the many enhancements to the Apache 2.4 HTTP Server is better a-synchronous support in its core, run-time loadable MPMs, reduced memory usage compared to Apache 2.2.x, several new modules, enhancements to existing modules, and much more.

Apache HTTP Server 2.4 provides a number of improvements and enhancements over the 2.2 version.
List here:   http://httpd.apache.org/docs/2.4/new_features_2_4.html

You can download Apache HTTP Server 2.4.1 from:  http://httpd.apache.org/download.cgi

Apache 2.4 comes with new modules like:

mod_proxy_fcgi
mod_proxy_scgi
mod_proxy_express
mod_remoteip
mod_heartmonitor, mod_lbmethod_heartbeat
mod_proxy_html
mod_sed
mod_auth_form
mod_session
mod_allowmethods
mod_lua
mod_log_debug
mod_buffer
mod_data
mod_ratelimit
mod_request
mod_reflector
mod_slotmem_shm
mod_xml2enc

More info here: http://www.apache.org/dist/httpd/Announcement2.4.html

If you have received this error while you were restarting the Apache2 server on Debian Squeeze:

/etc/init.d/apache2 start
Starting web server: apache2apache2: Could not reliably determine the server’s fully qualified domain name, using 127.0.1.1 for ServerName

To fix this problem  you need to edit the /etc/apache2/apache2.conf.

1. Open the /etc/apache2/apache2.conf file with your favorite editor.

vim /etc/apache2/apache2.conf

2. Now add the following line:

ServerName localhost

3. Restart apache2 server:

 /etc/init.d/apache2 restart
Restarting web server: apache2 … waiting ..

Now your problem is gone. Enjoy.

Use the following command:

apache2ctl -M

The output will look like this:

root@debian:~# apache2ctl -M
Loaded Modules:
core_module (static)
log_config_module (static)
logio_module (static)
mpm_worker_module (static)
http_module (static)
so_module (static)
actions_module (shared)
alias_module (shared)
auth_basic_module (shared)
authn_file_module (shared)
authz_default_module (shared)
authz_groupfile_module (shared)
authz_host_module (shared)
authz_user_module (shared)
autoindex_module (shared)
cgi_module (shared)
cgid_module (shared)
deflate_module (shared)
dir_module (shared)
env_module (shared)
mime_module (shared)
negotiation_module (shared)
reqtimeout_module (shared)
rewrite_module (shared)
rpaf_module (shared)
setenvif_module (shared)
status_module (shared)
Syntax OK
root@debian:~#

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