Setting up Memcached on my Raspberry Pi

This website is running on my Raspberry Pi with a 700 MHz ARM processor and 256Mb memory, these are not very high specs therefore i’m using Memcached. Memcached is a distributed memory caching system that is often used to speed up dynamic (database-driven) websites by caching data and objects in RAM to reduce stress on the webserver. This article handles the installation and configuration of Memcached on my Raspberry Pi running Raspbian (based on Debian Wheezy).

I am installing the software from packages, documentation available at Google Code, with apt-get.

apt-get install memcached

After the installation has completed you can see the stats with the following command:

echo "stats settings" | nc localhost 11211

This will give you a list with the following stats:

STAT maxbytes 67108864
STAT maxconns 1024
STAT tcpport 11211
STAT udpport 11211
STAT inter 127.0.0.1
STAT verbosity 0
STAT oldest 0
STAT evictions on
STAT domain_socket NULL
STAT umask 700
STAT growth_factor 1.25
STAT chunk_size 48
STAT num_threads 4
STAT num_threads_per_udp 4
STAT stat_key_prefix :
STAT detail_enabled no
STAT reqs_per_event 20
STAT cas_enabled yes
STAT tcp_backlog 1024
STAT binding_protocol auto-negotiate
STAT auth_enabled_sasl no
STAT item_size_max 1048576
STAT maxconns_fast no
STAT hashpower_init 0
STAT slab_reassign no
STAT slab_automove no
END

This shows that the Memcached is now listening on port 11211 with localhost connections only. We will change this to the, catch-all, IP 0.0.0.0 by changing the line: “-l 127.0.0.1” to “-l 0.0.0.0” in the file “/etc/memcached.conf”. After changing the config you can see if we can now make a connection from external machines use the following command:

netstat -ln4t | grep :11211
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