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Memcached

Note: This page is quite old and is likely out of date. My opinions may have also changed dramatically since this was written. It is here as a reference until I get around to updating it.

Installation

yum install memcached -y

Configuration

Memcached doesn’t have a whole lot of configuration options. There is the user it’s running under, what port it should listen on, what IP address it should bind too and how large it’s cache is.

The default port is 11211 (TCP & UDP), and by default it will bind to INADDR_ANY (0.0.0.0 and ::). Multiple addresses CAN be specified to bind too with the -l flag. By default memcached will use 64Mb of memory.

These options can be set in /etc/sysconfig/memcached. Here is mine which restricts where it’s bound too. For my general use 64Mb of storage is more than enough (roughly the equivalent of 17.5k pages of plain text and these are simple key value text pairs).

PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="64"
OPTIONS="-l 10.100.0.14"

Firewall

By default memcached listens on both UDP and TCP port 11211