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2Feb/124

How to: Install MemCached on CentOS / Redhat using yum

Installing memcached on a server for use with W3Total cache can seem daunting if you haven't done it before.  Once you've done it enough to work out a method and know the speed bumps you can come across,  you can

 

 

Use this command to determine the CentOS/RedHat version. You need this to know if you are working with version 4 5 or 6.

cat /etc/redhat-release

Use this command to determine if the OS is 64bit or 32bit (look for x64 if it is not there, 99% of the time you're on 32 bit)

uname -a

Retrieve the IUS Community repository installation files to allow an easy install of the memcache module from the IUS repo.
NOTE: These are examples for 64 bit Redhat 5. Browse the repo at http://dl.iuscommunity.org/pub/ius/stable/Redhat/ to make certain you have the right files for your server: (current as of 10/10/12)

mkdir ~/temp
cd ~/temp
wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/ius-release-1.0-10.ius.el5.noarch.rpm
wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/epel-release-5-4.noarch.rpm

NOTE: These ALTERNATE examples are for 32 bit Redhat 5. Browse the repo at http://dl.iuscommunity.org/pub/ius/stable/Redhat/ to make certain you have the right files for your server: (current as of 10/10/12)

mkdir ~/temp
cd ~/temp
wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/i386/ius-release-1.0-10.ius.el5.noarch.rpm
wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/i386/epel-release-5-4.noarch.rpm

 

Install both of these files:

rpm -Uvh *-release-*.rpm

Perform the install:

yum -y install memcached
service memcached start
chkconfig memcached on
pecl install memcache

Note: If you get a "Can't compile c code" error, try making your tmp folder executible before running the pecl command:

mount -o,remount,rw,exec /var/tmp

Make sure you remount the tmp directory securely with noexec when you are done:

mount -o,remount,rw,noexec /var/tmp

 

Make sure this line has correctly been added to the php.ini file for your site:

extension="memcache.so"

Sometimes the php.ini file has been overridden for a specific directory. Look for that if phpinfo() tells you memcache is not active.  This picture shows a site with the default php.ini overridden by a local copy. It required the extension line to be manually added to the overriding ini file.

phpinfo() output

 

 

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Who is Brian Layman

I am a WordPress expert living in North East Ohio. I am part of the ever expanding Open Source Internet workforce. I am able to stay at home, with my wife and four home schooled kids, while working as the Senior Developer for b5media - a blogging network that has hosted over 300+

I co-host the NEO WordPress Monthly meetup. I am the board chair of our local church. I host and have provided development services for clients such TV personalities Rhett and Link as well as corporations such as Borland International.

In my spare time I try to sneak out, canoe, mountain bike and camp as often as I can. Sometimes I also defend the earth against zombies and aliens, but usually not during the camping trips.

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In providing hosting, email, theme and plugin development to my clients, I function as a single point of contact answering to the needs of their expanding sites.

My service portfolio includes but is not limited to WordPress hosting, optimization, theme development and custom plugin creation. Community creation via vBulletin, Ning and BuddyPress and bbpress

I also am well experienced in site conversion, transition and merges. To clarify this, website technologies change and giving up your data is not an option. I have transitioned literally hundreds of sites from one platform to another.