Memcached is a generic purpose distributed high performance memory object caching system to use in speeding up dynamic database driven websites by caching data and objects in memory to reduce the amount the database needs to be read.
Memcached was originally developed by Danga Interactive for LiveJournal but is now used by many popular and large community driven websites like Slashdot, Wikipedia, SourceForge, GameFAQs, Facebook, Digg, Fotolog, Kayak and like. It is being distributed under a permissive free software licence. Know more about who all are using memcached
Things to consider before Installing memcached.
- First, decide how much memory you want to give memcached to use for caching.
- Then decide if you want to run memcached on the default port (11211) or not.
- Next decide if you want memcached to listen to a specific IP address if you have multiple IP addresses on your server
- Finally decide, what user you want to run memcached as; typically, you want to run it using Apache user so that Apache processes can access memcache data
Installation Process
1. If you don’t have rpmforge installed, follow this step.
wget http://dag.wieers.com/rpm/packages/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
rpm –install rpmforge-release-0.3.6-1.el5.rf.i386.rpm
yum install –enablerepo=rpmforge memcached
2. Start memcached.
memcached -d -m 512 -l 127.0.0.1 -p 11211 -u nobody
The “-m SIZE” is the flag for setting the memory requirements in MBs. Once this cache is filled memcache will just start to overwrite with newer content. Please experiment with this setting to find what works best for you.
3. Install PHP extension.
wget http://pecl.php.net/get/memcache-2.2.5.tgz
4. Extract tar file.
tar -xvf memcache-2.2.5.tgz
5. Open the directory.
cd memcache-2.2.5
6. Install the memchaced PHP extension.
phpize && ./configure –enable-memcache && make
7. Copy the extension.
cp modules/memcache.so {PHP extension directory}
8. Edit your php.ini and add the following line.
extension=memcache.so
9. Last is restart your webserver.
10. If you check your server using a phpinfo page you should now see a MemCache section on the page. You can now fully use the MemCache functionality in your PHP.
memcached pre-requissites
yum -y install libevent libevent-devel
How to make memcached run automatically when you restart your server?. Add this line to rc.local
#!/bin/sh
echo “# Start memcached” >> /etc/rc.local
echo “/usr/local/bin/memcached -d -m 1024 -u httpd -l 127.0.0.1″ >> /etc/rc.local
How to have a multiple memcached server.
Create LocalSettings.php file and this line.
$wgMainCacheType = CACHE_MEMCACHED;
$wgParserCacheType = CACHE_MEMCACHED; # optional
$wgMessageCacheType = CACHE_MEMCACHED; # optional
$wgMemCachedServers = array( “127.0.0.1:11211″ );
$wgSessionsInMemcached = true; # optional
To use multiple servers (physically separate boxes or multiple caches on one machine on a large-memory x86 box), just add more items to the array. To increase the weight of a server (say, because it has twice the memory of the others and you want to spread usage evenly), make its entry a subarray:
$wgMemCachedServers = array(“127.0.0.1:11211″, # one gig on this box
array(“127.0.0.1:11211″, 2 ) # two gigs on the other box
);
Security Note:
Memcached has no security or authentication. Please ensure that your server is appropriately firewalled,
and that the port(s) used for memcached servers are not publicly accessible. Otherwise, anyone on the internet can put data into and read data from your cache.
My head keeps on popping ideas, I couldn’t sleep thinking the iCafe 2.2 final version. Ok after 2.2 beta I’ll be taking break for about 2 days then continue on delopment, iCafe final version will have new features and bug fixes which I have seen during my phase 3 testing this weekend. iCafe 2.2 client we’ll have new GUI finishing what I have in mind before which I try to ignore during development. I’ll be focusing on Server and Client on this development.
2.2 Final version
Check on Time left transfer
Time transfer
Group Payout
Organize some menu
Standard icons
Print Monitoring
Online registration for copy of iCafe timer
Double check functionality of Promo’s
Set expiration date for Promo’s
Client Security and Policies will be set to server no more config to client
Auto detect plugin and plugout of usb
Restrict copying of files to USB (Prevent lanshop games to be copied)
More features to be post…
So if you ideas for comments please don’t hesitate to post it to our forum.
I spend my weekend testing and fixing bugs I found on iCafe timer, so releasing beta will not cause so much problem on setup and using it on production. all functionality seems working fine with no error except what I left I didn’t focus on that for a moment.
So tomorrow I’ll write guide and procedure how to setup and used iCafe timer, before I’ll release beta version.
Hope you like this version as I put so much effort on it.