How to install Memcached on CentOS 6 / RHEL 6
Free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering.
Memcached is simple yet powerful. Its simple design promotes quick deployment, ease of development, and solves many problems facing large data caches. Its APIis available for most popular languages.
Here is the simple steps to install Memcached on CentOS 6.
Open Terminal and then switch to root user.
[[email protected]~/]$ su -l
Install Memcached:
Install Memcached using the following command.
[[email protected]~/]# yum install memcached
Edit Memcached configuration file to change / enable the features.
[[email protected]~/]# vi /etc/sysconfig/memcached
There are some default settings available in the configuration file, change it (if necessary). The following is example settings for 256MB caching.
PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="256"
OPTIONS=""
Start Memcached.
[[email protected]~/]# /etc/init.d/memcached restart
To auto-start Memcached on booting.
[[email protected]~/]# chkconfig memcached on
Confirm the Memcached running status.
[[email protected]~/]# memcached-tool 127.0.0.1:11211 stats
#127.0.0.1:11211 Field Value
accepting_conns 1
auth_cmds 0
auth_errors 0
bytes 0
bytes_read 7
bytes_written 0
cas_badval 0
cas_hits 0
cas_misses 0
cmd_flush 0
cmd_get 0
cmd_set 0
conn_yields 0
connection_structures 11
curr_connections 10
curr_items 0
decr_hits 0
decr_misses 0
delete_hits 0
delete_misses 0
evictions 0
get_hits 0
get_misses 0
incr_hits 0
incr_misses 0
limit_maxbytes 67108864
listen_disabled_num 0
pid 29594
pointer_size 64
rusage_system 0.002999
rusage_user 0.000000
threads 4
time 1332048624
total_connections 11
total_items 0
uptime 85
version 1.4.4
Iptables entry:
Add the following entry to allow the incoming connection on port no 11211.
-A INPUT -m state --state NEW -m tcp -p tcp --dport 11211 -j ACCEPT
Check the remote connectivity.
[[email protected]~/]# echo stats | nc memcache_host_name_or_ip 11211
Install PHP Module:
Install Memcached PHP module to work with PHP5.
[[email protected]~/]# yum install php php-pecl-memcache
Now restart the Memcached and Apache server to take effect.
[[email protected]~/]# /etc/init.d/memcached restart
[[email protected]~/]# /etc/init.d/httpd restart
That’s all!