Install Memcached on CentOS 7
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 7.
Open Terminal and then switch to root user.
[raj@itzgeek~/]$ su -l
Install Memcached:
Install Memcached using the following command.
[root@itzgeek~/]# yum install memcached
Edit Memcached configuration file to change / enable the features.
[root@itzgeek~/]# 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@itzgeek~/]# systemctl start memcached.service
To auto-start Memcached on booting.
[root@itzgeek~/]# systemctl enable memcached.service
Confirm the Memcached running status.
[root@itzgeek~/]# 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
cmd_touch 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
evicted_unfetched 0
evictions 0
expired_unfetched 0
get_hits 0
get_misses 0
hash_bytes 524288
hash_is_expanding 0
hash_power_level 16
incr_hits 0
incr_misses 0
libevent 2.0.21-stable
limit_maxbytes 268435456
listen_disabled_num 0
pid 12545
pointer_size 64
reclaimed 0
reserved_fds 20
rusage_system 0.014289
rusage_user 0.000000
threads 4
time 1406441667
total_connections 11
total_items 0
touch_hits 0
touch_misses 0
uptime 48
version 1.4.15
Iptables entry:
Add the following entry to allow the incoming connection on port no 11211.
firewall-cmd --permanent --zone=public --add-port=11211/tcp
Check the remote connectivity.
[root@itzgeek~/]# echo stats | nc memcache_host_name_or_ip 11211
Install PHP Module:
Install Memcached PHP module to work with PHP5.
[root@itzgeek~/]# yum install php php-pecl-memcache
Now restart the Memcached and Apache server to take effect.
[root@itzgeek~/]# systemctl restart memcached.service
[root@itzgeek~/]# systemctl restart httpd.service
That’s all!