Install Memcached and PHP Memcached extension under CentOS

Regarding the high-performance distributed memory object caching system Memcached, we have mentioned in another article "How to install memcached in Windows system". This time, let's take a look at how to install Memcached and PHP Memcached extension in CentOS system

I. Install Memcached

1. Install the dependency package libevent

Memcached depends on the libevent library, so you may need to execute before installation

yum install libevent-devel

2. Install memcached

Download the latest source code from http://memcached.org/ (1.4.23)

tar -xzvf memcached-1.4.23.tar.gz 
cd memcached-1.4.23 
./configure --prefix=/usr/local/memcache 
make && make install

3. Configure memcached to start automatically

Copy scripts/memcached.sysv in the source directory to /etc/init.d/memcached. You need to modify the following line in /etc/init.d/memcached:

chown $USER /usr/local/memcache/bin/memcached 
daemon /usr/local/memcache/bin/memcached -d -p $PORT -u $USER -m $CACHESIZE -c $MAXCONN -P /var/run/memcached/memcached.pid $OPTIONS

(That is, to modify the path where memcached is located)

Then execute the following command:

chmod 755 memcached 
chkconfig --add memcached

Use the following command to start the service

service memcached start

II. Install PHP Memcached extension

There are two memcache extensions from pecl.php.net:

• memcache memcached extension
• memcached PHP extension for interfacing with memcached via libmemcached library

The version of memcached is relatively new and uses the libmemcached library. libmemcached is considered to be better optimized and should have higher performance than the PHP-only version of memcache. So memcached is installed here (assuming php5.4 is already installed in /usr/local/php).

1. Install dependent libraries

https://launchpad.net/libmemcached/1.0/1.0.4/+download/libmemcached-1.0.4.tar.gz

tar -xzvf libmemcached-1.0.4.tar.gz 
cd libmemcached-1.0.4 
./configure 
make 
make install

2. Install memcached

Download from http://pecl.php.net/get/memcached-2.0.1.tgz and install using the following command:

tar vxzf memcached-2.0.1.tgz 
cd memcache-2.0.1 
phpize 
./configure --enable-memcache --with-php-config=/usr/local/php/bin/php-config 
make 
make install

After the installation is complete, find the generated memcached.so in the directory indicated by the last displayed Installing shared extensions: /usr/local/*** , and copy it to the directory pointed to by extension_dir in php.ini. Modify php.ini and add the line extension = memcached.so and restart Apache. Then open the phpinfo information page to see if the memcached extension is installed successfully.

Of course, we can also write a small test code to see if memcached is running properly. For specific steps, please refer to the article How to install memcached under Windows system

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