{"id":159,"date":"2015-04-27T12:23:51","date_gmt":"2015-04-27T12:23:51","guid":{"rendered":"http:\/\/betakb.veeble.org\/?p=159"},"modified":"2025-03-14T15:00:14","modified_gmt":"2025-03-14T09:30:14","slug":"memcached-and-php-memcache","status":"publish","type":"post","link":"https:\/\/www.veeble.com\/kb\/memcached-and-php-memcache\/","title":{"rendered":"Memcached and php-memcache"},"content":{"rendered":"\n

Memcached<\/a> 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.<\/p>\n\n\n\n

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<\/a>.<\/p>\n\n\n\n

2. Install Memcached.<\/p>\n\n\n\n

Use yum to install memcached<\/p>\n\n\n\n

yum -y install memcached\n<\/pre>\n\n\n\n
As soon as the Memcached installation is completed, edit options for Memcached in \/etc\/sysconfig\/memcached to meet your need.<\/p>\n\n\n\n
vi \/etc\/sysconfig\/memcached\n<\/pre>\n\n\n\n
PORT=\u201d11211\u2033                #define on which port to run\nUSER=\u201dnobody\u201d           #same as apache user\nMAXCONN=\u201d1024\u2033     #maximum number of connections allowed\nCACHESIZE=\u201d64\u2033         #memory used for caching\nOPTIONS=\u201d\"                   #use for any custom options\n<\/pre>\n\n\n\n
Save the file. All options can be seen by using the following command<\/p>\n\n\n\n
memcached -h\n<\/pre>\n\n\n\n
Start memcached<\/p>\n\n\n\n
\/etc\/init.d\/memcached start\nStarting Distributed memory caching (memcached):           [  OK  ]\n<\/pre>\n\n\n\n
To check the running status of memcached<\/p>\n\n\n\n
\/etc\/init.d\/memcached status\nmemcached (pid 6475) is running\u2026\n<\/pre>\n\n\n\n
and<\/p>\n\n\n\n
netstat -anp | grep 11211\ntcp  0  0 :::11211    :::*  LISTEN      6475\/memcached\nudp 0  0 0.0.0.0:11211  0.0.0.0:* 6475\/memcached\n<\/pre>\n\n\n\n
3. Install PHP Extension.<\/p>\n\n\n\n
Download and install the latest stable memcache version from PECL.<\/p>\n\n\n\n
cd \/usr\/local\/src\nwget http:\/\/pecl.php.net\/get\/memcache-2.2.7.tgz<\/a>\ntar zxvf memcache-2.2.7.tgz\ncd memcache-2.2.7\nphpize\n.\/configure\nmake\nmake install\n<\/pre>\n\n\n\n
memcache.so will be installed in the php modules directory, now enable memcache.so extension in php.ini<\/p>\n\n\n\n
To find out your php.ini location, execute the following command<\/p>\n\n\n\n
php -i | grep php.ini\nConfiguration File (php.ini) Path => \/usr\/local\/lib\nLoaded Configuration File => \/usr\/local\/lib\/php.ini\n<\/pre>\n\n\n\n
vi \/usr\/local\/lib\/php.ini\n<\/pre>\n\n\n\n
extension = \u201cmemcache.so\u201d\n<\/pre>\n\n\n\n
Save the file and restart httpd server.<\/p>\n\n\n\n
\/etc\/init.d\/httpd restart\n<\/pre>\n\n\n\n
To check if the memcache extension is loaded in php, execute the following command.<\/p>\n\n\n\n
php -i | grep memcache\nmemcache\nmemcache support => enabled\nmemcache.allow_failover => 1 => 1\nmemcache.chunk_size => 8192 => 8192\nmemcache.default_port => 11211 => 11211\nmemcache.default_timeout_ms => 1000 => 1000\nmemcache.hash_function => crc32 => crc32\nmemcache.hash_strategy => standard => standard\nmemcache.max_failover_attempts => 20 => 20\nRegistered save handlers => files user sqlite memcache\nPWD => \/usr\/src\/memcache-2.2.7\n_SERVER[\"PWD\"] => \/usr\/src\/memcache-2.2.7\n_ENV[\"PWD\"] => \/usr\/src\/memcache-2.2.7\n<\/pre>\n\n\n\n
This information can also be seen using phpinfo().<\/p>\n\n\n\n
<\/div>\n\n\n\n
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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 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