Memcached and PHP with cPanel

Install Required Packages

yum install libevent libevent-devel -y

Memcached Service

Head over to http://memcached.org/ and grab the latest version.

Configure and Compile Latest Version

wget http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz
tar xvf memcached-1.4.5.tar.gz
cd memcached-1.4.5
./configure && make && make install

Install Memcached Configuration

Open /etc/memcached.conf with your favorite editor and paste in:

#Memory a usar
-m 16
# default port
-p 11211
# user to run daemon nobody/apache/www-data
-u nobody
# only listen locally
-l 127.0.0.1

Install initiation scripts.

touch /etc/init.d/memcached
chmod +x /etc/init.d/memcached

Open /etc/init.d/memcached with your favorite editor and paste in:

#!/bin/bash
#
# memcached This shell script takes care of starting and stopping
# standalone memcached.
#
# chkconfig: - 80 12
# description: memcached is a high-performance, distributed memory
# object caching system, generic in nature, but
# intended for use in speeding up dynamic web
# applications by alleviating database load.
# processname: memcached
# config: /etc/memcached.conf
# Source function library.
. /etc/rc.d/init.d/functions
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/local/bin/memcached
DAEMONBOOTSTRAP=/usr/local/bin/start-memcached
DAEMONCONF=/etc/memcached.conf
NAME=memcached
DESC=memcached
PIDFILE=/var/run/$NAME.pid
[ -x $DAEMON ] || exit 0
[ -x $DAEMONBOOTSTRAP ] || exit 0
RETVAL=0
start() {
echo -n $"Starting $DESC: "
daemon $DAEMONBOOTSTRAP $DAEMONCONF
RETVAL=$?
[ $RETVAL -eq 0 ] && touch $PIDFILE
echo
return $RETVAL
}
stop() {
echo -n $"Shutting down $DESC: "
killproc $NAME
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f $PIDFILE
return $RETVAL
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart|reload)
stop
start
RETVAL=$?
;;
status)
status $prog
RETVAL=$?
;;
*)
echo $"Usage: $0 {start|stop|restart|status}"
exit 1
esac
exit $RETVAL

Install Memcached monitoring script

Create the start-memcached script

touch /usr/local/bin/start-memcached
chmod +x /usr/local/bin/start-memcached

Open /usr/local/bin/start-memcached with your favorite editor and paste in:

#!/usr/bin/perl -w
# start-memcached
# 2003/2004 - Jay Bonci <jaybonci@debian.org>
# This script handles the parsing of the /etc/memcached.conf file
# and was originally created for the Debian distribution.
# Anyone may use this little script under the same terms as
# memcached itself.
use strict;
if ($> != 0 and $< != 0) {
print STDERR "Only root wants to run start-memcached.\n";
exit;
}
my $etcfile = shift || "/etc/memcached.conf";
my $params = [];
my $etchandle;
# This script assumes that memcached is located at /usr/bin/memcached, and
# that the pidfile is writable at /var/run/memcached.pid
my $memcached = "/usr/local/bin/memcached";
my $pidfile = "/var/run/memcached.pid";
# If we don't get a valid logfile parameter in the /etc/memcached.conf file,
# we'll just throw away all of our in-daemon output. We need to re-tie it so
# that non-bash shells will not hang on logout. Thanks to Michael Renner for
# the tip
my $fd_reopened = "/dev/null";
sub handle_logfile {
my ($logfile) = @_;
$fd_reopened = $logfile;
}
sub reopen_logfile {
my ($logfile) = @_;
open *STDERR, ">>$logfile";
open *STDOUT, ">>$logfile";
open *STDIN, ">>/dev/null";
$fd_reopened = $logfile;
}
# This is set up in place here to support other non -[a-z] directives
my $conf_directives = {
"logfile" => \&handle_logfile
};
if (open $etchandle, $etcfile) {
foreach my $line (<$etchandle>) {
$line =~ s/\#.*//go;
$line = join ' ', split ' ', $line;
next unless $line;
next if $line =~ /^\-[dh]/o;
if ($line =~ /^[^\-]/o) {
my ($directive, $arg) = $line =~ /^(.*?)\s+(.*)/;
$conf_directives->{$directive}->($arg);
next;
}
push @$params, $line;
}
}
unshift @$params, "-u root" unless (grep $_ eq '-u', @$params);
$params = join " ", @$params;
if (-e $pidfile) {
open PIDHANDLE, "$pidfile";
my $localpid = <PIDHANDLE>;
close PIDHANDLE;
chomp $localpid;
if (-d "/proc/$localpid") {
print STDERR "memcached is already running.\n";
exit;
} else {
`rm -f $localpid`;
}
}
my $pid = fork();
if ($pid == 0) {
reopen_logfile($fd_reopened);
exec "$memcached $params";
exit(0);
} elsif (open PIDHANDLE,">$pidfile") {
print PIDHANDLE $pid;
close PIDHANDLE;
} else {
print STDERR "Can't write pidfile to $pidfile.\n";
}

Start the Memcached Daemon

We will now start the daemon. (it is ok if "shutting down memcached" says fail.)

/etc/init.d/memcached restart
#Shutting down memcached: [ OK ]
#Starting memcached: [ OK ]

Make sure its running by:

ps aux | grep memcached
#nobody 5966 0.5 0.3 18248 16444 pts/0 S 13:55 0:00 /usr/local/bin/memcached -u root -m 16 -p 11211 -u nobody -l 127.0.0.1

Set Memcached to run at startup:

/sbin/chkconfig memcached on
/sbin/chkconfig --list | grep memcached
#memcached 0:off 1:off 2:on 3:on 4:on 5:on 6:off

PHP Memcache Extension

Download the latest stable version of memcache from http://pecl.php.net/package/memcache

Download and Install

wget http://pecl.php.net/get/memcache-2.2.5.tgz
tar xvf memcache-2.2.5.tgz
cd memcache-2.2.5
phpize
./configure && make && make install

Update php.ini Configuration

Create an empty file called test.php and place this in it:

<? phpinfo(); ?>

Determine what php.ini file is configured.

php -f test.php | grep "Loaded Configuration File"
#Loaded Configuration File => /usr/local/lib/php.ini

Now open /usr/local/lib/php.ini with your favorite text editor and find the "Dynamic Extensions" section.

Add this

extension=memcache.so

Now restart apache with:

service httpd restart

Check to make sure the extension is enabled

Run the command:

php -f test.php | grep "memcache support"

This should return "enabled" if everything is good.
memcache support => enabled

If this command does not return any thing the memcache plugin did not load correctly.

You can now delete test.php, your memcache installation should be functional.

References:

http://www.vbseo.com/blogs/danny-bembibre/daemon-scripts-memcached-44/

http://bloke.org/linux/installing-memcached-on-centos-cpanel/