Memcached on Ubuntu has actually two components. A standalone program running on your server and a client PHP extension. To be honest I noticed no increase in performance using memcached with the W3 Total Cache plugin.
root@ns1:~# aptitude install memcached
The following NEW packages will be installed:
memcached
First we need to install the PEAR framework. This is a distribution system for handling reusable PHP components.
root@ns1:~# aptitude install php-pear
The following NEW packages will be installed:
php-pear php5-cli{a}
Now we can install the PHP component using PEAR. Type YES to all options prompted.
root@ns1:~# pecl install memcache
...
Installing '/usr/lib/php5/20090626/memcache.so'
install ok: channel://pecl.php.net/memcache-2.2.6
configuration option "php_ini" is not set to php.ini location
You should add "extension=memcache.so" to php.ini
If you are using php5-fpm this will already be setup for you.
root@ns1:/etc/php5/fpm/conf.d# cat /etc/php5/fpm/conf.d/memcache.ini
; uncomment the next line to enable the module
extension=memcache.so
[memcache]
memcache.dbpath="/var/lib/memcache"
memcache.maxreclevel=0
memcache.maxfiles=0
memcache.archivememlim=0
memcache.maxfilesize=0
memcache.maxratio=0
Now let’s verify
root@ns1:/etc/php5/fpm/conf.d# pgrep -fl memcached
27823 /usr/bin/memcached -m 64 -p 11211 -u memcache -l 127.0.0.1
root@ns1:/etc/php5/fpm/conf.d# netstat -an | grep 11211
tcp 0 0 127.0.0.1:11211 0.0.0.0:* LISTEN
udp 0 0 127.0.0.1:11211 0.0.0.0:*
Configuration Files
/etc/memcached.conf
- you can increase the amount of memory in the memcache pool in this file. The default is 64M, which should be sufficient.
Log Files
/var/log/memcached.log
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