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.
[raj@geeksite~/]$ su -l
Install Memcached:
Install Memcached using the following command.
[root@geeksite~/]# yum install memcached
Edit Memcached configuration file to change / enable the features.
[root@geeksite~/]# 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.
[root@geeksite~/]# /etc/init.d/memcached restart
To auto-start Memcached on booting.
[root@geeksite~/]# chkconfig memcached on
Confirm the Memcached running status.
[root@geeksite~/]# 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.
[root@geeksite~/]# echo stats | nc memcache_host_name_or_ip 11211
Install PHP Module:
Install Memcached PHP module to work with PHP5.
[root@geeksite~/]# yum install php php-pecl-memcache
Now restart the Memcached and Apache server to take effect.
[root@geeksite~/]# /etc/init.d/memcached restart
[root@geeksite~/]# /etc/init.d/httpd restart
That’s all!