For my Ruby on Rails and PHP applications I always need to install the memcached on server. Here I am going to give you the steps for installing the memcached.

Very important note: you need to install the gcc compiler for memcached binary installation. Using the memcached with php installation you need the phpize and php-pecl-memcached installed. follow my steps and memcached binary installtion.

# yum install gcc*
# cd /usr/src
# wget http://pecl.php.net/get/memcache-2.2.5.tgz
# tar zxvf memcache-2.2.5.tgz
# cd memcache-2.2.5
# phpize
# ./configure
# make
# make install

For checking the php.ini file path use following command.

php -i | grep php.ini
Configuration File (php.ini) Path => /usr/local/lib
Loaded Configuration File => /usr/local/lib/php.ini

or your php.ini file will be following location

# vim /etc/php.ini

Put following line in that file
extension = “memcache.so”
Restart the apache server
# /etc/init.d/httpd restart

To check is memcache extension loaded in php, execute following command.
#php -i | grep memcache

After restarting the machine memcache need to restart. For that us ( Use this step for only Admin Adserver Box)
# vi /etc/rc.local
Put following contect in to rc.local file (file location – /etc/rc.local)
# memcached -d -p 11211 -u nobody -c 1024 -m 1024

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If you try to install memcached with Linux server then use following commands

# yum install libevent
# yum install libmemcached libmemcached-devel
# yum install memcached

For Starting the memcached server
# memcached -d -m 512 -l 127.0.0.1 -p 11211 -u nobody

11211 port is default port for memcached server.

For using the memecached with php client you need to install following package

# pecl install memcache

After installing all packages restart the apache server.

# /etc/sbin/service httpd restart

<?php
/* OO API */
$memcache_obj = new Memcache;
$memcache_obj->connect('memcache_host', 11211);
$memcache_obj->set('any_key', 'some value', MEMCACHE_COMPRESSED, 50);
echo $memcache_obj->get('any_key');
?>

Important Note: Memcached key has limitations of 250 charactors, So key value should be with in 250 charactors.

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Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering.

Please use following commands for installtion;
[root@ip-192-168-2-125 wordpressapi]# wget http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-2.noarch.rpm

[root@ip-192-168-2-125 wordpressapi]# yum remove php-common

[root@ip-192-168-2-125 wordpressapi]# yum install php-pdo php-mcrypt squirrelmail php-pecl-apc php-xml php-gd php-devel php php-imap php-pgsql php-pear php-soap php-mbstring php-ldap php-mysql php-cli php-pecl-memcache

[root@ip-192-168-2-125 wordpressapi]# /etc/init.d/memcached restart
Shutting down Distributed memory caching (memcached): [ OK ]
Starting Distributed memory caching (memcached): [ OK ]

[root@ip-192-168-2-125 wordpressapi]# /etc/init.d/httpd restart
Stopping httpd: [ OK ]
Starting httpd: [ OK ]

[root@ip-192-168-2-125 wordpressapi]# vim /etc/php.ini
In php.ini file Please find the “extension=modulename.extension” words
Under that sentance please paste following line:
extension=memcache.so
Note: dont comments that line.

[root@ip-192-168-2-125 wordpressapi]# /etc/init.d/httpd restart
Stopping httpd: [ OK ]
Starting httpd: [ OK ]
[root@ip-192-168-2-125 wordpressapi]#

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Find help for memcached commands and option
memcached -help

Start memcached server(11211 is default port Number for memcached server)
memcached -m 500 -l 192.168.2.4 -p 11211 -vv
(192.168.2.4 this is my local ip address you can cahnge that)

Stop the Memcached server
ps -ef|grep memcached
kill PROCESS_ID

start memcached server with
memcached -m 500 -l 192.168.2.4 -p 11211 -vv

How to install on Windows server:
1.  Downloaded this Win32 port of memcached by Kenneth Dalgleish.(download from following url)
http://thewebfellas.com/blog/2008/6/9/rails-2-1-now-with-better-integrated-caching
2. Extracted the files to C:\Program Files\memcached
3. Opened a command prompt in the folder and installed memcached as a service using memcached -d install
4. Started the service using net start “memcached Server”

How to use memcache in Rails app?
Open  /config/environments/development.rb for development mode,
production.rb for production mode.
paste following line into file.
config.cache_store = :mem_cache_store, ’127.0.0.1′, ’127.0.0.1:11211′ , { :namespace => ‘dev’ }
(127.0.0.1 this is my local ip address you can cahnge or point out to any server where memcached server is running)
Restart mongrel server. you are ready to use memcached server

How to use in Rails
@user= User.find(1)—–OLD Code

New Code With Caching:
@user = cache(['User',1],:expires_in => 30.minutes) do
User.find(1)
end

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