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Memcached and php-memcache

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.

1. Setting-up RPMForge repository. RPMForge repository (http://dag.wieers.com) is the biggest rpm repository for RHEL, and CentOS for all versions. Set up the RPMForge repository as mentioned here.

2. Install Memcached.

Use yum to install memcached

yum -y install memcached

As soon as the Memcached installation is completed, edit options for Memcached in /etc/sysconfig/memcached to meet your need.

vi /etc/sysconfig/memcached
PORT=”11211″                #define on which port to run
USER=”nobody”           #same as apache user
MAXCONN=”1024″     #maximum number of connections allowed
CACHESIZE=”64″         #memory used for caching
OPTIONS=”"                   #use for any custom options

Save the file. All options can be seen by using the following command

memcached -h

Start memcached

/etc/init.d/memcached start
Starting Distributed memory caching (memcached):           [  OK  ]

To check the running status of memcached

/etc/init.d/memcached status
memcached (pid 6475) is running…


netstat -anp | grep 11211
tcp  0  0 :::11211    :::*  LISTEN      6475/memcached
udp 0  0* 6475/memcached

3. Install PHP Extension.

Download and install the latest stable memcache version from PECL.

cd /usr/local/src
wget http://pecl.php.net/get/memcache-2.2.7.tgz
tar zxvf memcache-2.2.7.tgz
cd memcache-2.2.7
make install

memcache.so will be installed in the php modules directory, now enable memcache.so extension in php.ini

To find out your php.ini location, execute the following command

php -i | grep php.ini
Configuration File (php.ini) Path => /usr/local/lib
Loaded Configuration File => /usr/local/lib/php.ini
vi /usr/local/lib/php.ini
extension = “memcache.so”

Save the file and restart httpd server.

/etc/init.d/httpd restart

To check if the memcache extension is loaded in php, execute the following command.

php -i | grep memcache
memcache support => enabled
memcache.allow_failover => 1 => 1
memcache.chunk_size => 8192 => 8192
memcache.default_port => 11211 => 11211
memcache.default_timeout_ms => 1000 => 1000
memcache.hash_function => crc32 => crc32
memcache.hash_strategy => standard => standard
memcache.max_failover_attempts => 20 => 20
Registered save handlers => files user sqlite memcache
PWD => /usr/src/memcache-2.2.7
_SERVER["PWD"] => /usr/src/memcache-2.2.7
_ENV["PWD"] => /usr/src/memcache-2.2.7

This information can also be seen using phpinfo().

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