memcached installation on Ubuntu

gistfile1.txt

Ubuntu-12-04
https://www.digitalocean.com/community/tutorials/how-to-install-and-use-memcache-on-ubuntu-12-04

Ubuntu-14-04
https://www.digitalocean.com/community/tutorials/how-to-install-and-use-memcache-on-ubuntu-14-04

Read More:
https://www.digitalocean.com/community/tags/caching?type=tutorials

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In /etc/memcached.conf 
# Start with a cap of 64 megs of memory. It's reasonable, and the daemon default
# Note that the daemon will grow to this size, but does not start out holding this much
# memory
# -m 64
-m 2048 
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Start memcache by firing this command: 
memcached -d -m 2048 -l 127.0.0.1 -p 11211 -u nobody (d = daemon, m = memory, u = user, l = IP to listen to, p = port)

Check your memcached server is running successfully: 
ps -eaf | grep memcached

Command below is to get process id only
pidof memcached

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Change the memcached configuration setting for CACHESIZE 
1) Open /etc/sysconfig/memcached in a text editor.
2) Locate the value for CACHESIZE and change it to at least 1GB.
For example, CACHESIZE="1GB"
3) Save your changes and Restart memcached:
service memcached restart

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NOTE: you might want to check webserver if apache2 or httpd then restart its service

To verify memcached is recognized by the web server:

Create a phpinfo.php file in the web server’s docroot:

<?php
// Show all information, defaults to INFO_ALL
phpinfo();
?>

Go to that page in your web browser. For example, http://example.com/phpinfo.php

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Memcached cheat-sheet
http://lzone.de/cheat-sheet/memcached

For distributed memcached or horizontal scaling
https://www.digitalocean.com/community/tutorials/how-to-share-php-sessions-on-multiple-memcached-servers-on-ubuntu-14-04