Install memcached with CentOS and WHM/cPanel

This guide will walk you through installing memcache and memcached on a dedicated or vps server.

For the wiki version of this guide visit: http://wiki.beyondhosting.net/Memcached_and_PHP_with_cPanel

root# yum install libevent libevent-devel -y

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

root# yum install libevent-devel libevent gcc make -y
root# wget http://memcached.googlecode.com/files/memcached-1.4.5.tar.gz
root# tar xvf memcached-1.4.5.tar.gz
root # cd memcached-1.4.5
root# ./configure && make && make install

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
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
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";
}

Now we start the memcached daemon. (it is ok if “shutting down memcached” says fail.)

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

Make sure its running by:

[root@srv01 init.d]# 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

Now we will set memcached to run at startup:

[root@ ~]# /sbin/chkconfig memcached on
[root@ ~]# /sbin/chkconfig --list | grep memcached
memcached       0:off   1:off   2:on    3:on    4:on    5:on    6:off

Now we will install the memcache plugin for PHP.

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

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

Now open /usr/local/lib/php.ini with your favorite text editor and find the dynamic extension section.

Add this

extension=memcache.so

Now restart apache with:

service httpd restart

We will now check to make sure memcached is running.

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

<? phpinfo();  ?>
root# php -f test.php  | grep "memcache support"
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/

cPanel and basic iptables

Save this to a file and run it, This will empty your iptables and set a solid set of secure rules that are compatible with cPanel servers running DNS clustering. If you run DNS locally be sure to allow 53 on TCP AND UDP!

/sbin/iptables -F
/sbin/iptables -X
/sbin/iptables -Z
/sbin/iptables -P INPUT DROP
/sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A INPUT -p tcp ! --syn -j REJECT --reject-with tcp-reset
/sbin/iptables -A INPUT -m state --state INVALID -j DROP
/sbin/iptables -P OUTPUT DROP
/sbin/iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A OUTPUT -p tcp ! --syn -j REJECT --reject-with tcp-reset
/sbin/iptables -A OUTPUT -m state --state INVALID -j DROP
/sbin/iptables -P FORWARD DROP
/sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A FORWARD -p tcp ! --syn -j REJECT --reject-with tcp-reset
/sbin/iptables -A FORWARD -m state --state INVALID -j DROP
/sbin/iptables -A INPUT -i lo -j ACCEPT
/sbin/iptables -A OUTPUT -o lo -j ACCEPT
/sbin/iptables -A FORWARD -i lo -o lo -j ACCEPT

##Acceptable IP
/sbin/iptables -A INPUT -s x.x.x.xx -j ACCEPT #YOUR TRUSTED IP's

##General Web/File Services
/sbin/iptables -A INPUT -p tcp --dport 80  -j ACCEPT #HTTP
/sbin/iptables -A INPUT -p tcp --dport 443 -j ACCEPT #HTTPS
/sbin/iptables -A INPUT -p tcp --dport 21 -j ACCEPT #FTP
/sbin/iptables -A INPUT -p tcp --dport 22 -j ACCEPT #SSH
/sbin/iptables -A INPUT -p tcp --dport 5666 -j ACCEPT #NRPE

##Email Services
/sbin/iptables -A INPUT -p tcp --dport 25 -j ACCEPT #SMTP
/sbin/iptables -A INPUT -p tcp --dport 110 -j ACCEPT #POP3
/sbin/iptables -A INPUT -p tcp --dport 143 -j ACCEPT #IMAP
/sbin/iptables -A INPUT -p tcp --dport 465 -j ACCEPT #SMTPs
/sbin/iptables -A INPUT -p tcp --dport 993 -j ACCEPT #IMAPs
/sbin/iptables -A INPUT -p tcp --dport 995 -j ACCEPT #POP3s

##cPanel Services
/sbin/iptables -A INPUT -p tcp --dport 2083 -j ACCEPT #cPanel
/sbin/iptables -A INPUT -p tcp --dport 2087 -j ACCEPT #WHM
/sbin/iptables -A INPUT -p tcp --dport 2096 -j ACCEPT #Webmail

##Allow Ping
/sbin/iptables -A INPUT -p icmp --icmp-type 8/0 -j ACCEPT

##Final Blocks
/sbin/iptables -A INPUT -j DROP
/sbin/iptables -A OUTPUT -j ACCEPT
/sbin/iptables -A FORWARD -j DROP

Guide on removing iptable rules

If you loose access to your server while using this, well that sucks.   Setup a cron job to stop the iptables service every 5 minutes just in case.