zwol
New member
- Joined
- Apr 21, 2016
- Messages
- 4
- Points
- 0
Memcached is a cache system which works by temporarily storing information or data in RAM. Due to the speed of read-write memory always being faster than reading files from the hard drive or even solid state drive, the memcached stored files should help speed up your system considerably.
Models of Memcached operations:
In this article, I will guide you how to install Memcached on CentOS 7/6/5.
Install Memcached
- Install repository for CentOS 5 Remi (CentOS 7 and 6 do not need this step)
- Install Memcached package
You should note that there are two package memcache and memcached (with and without the d at the end) and there are 2 versions of the PHP Extension Module php-pecl respectively, memcache and php-pecl-memcached. We will use version 2 (with the letter d) because it is stable and supports more functions.
Configure Memcached
The most important parameters to keep in mind is that Cachesize unit is MB. For example, below I used to 128MB cache (default 64MB)
Booting Memcached
Check that Memcached is running
Note uptime†parameter at the bottom, which means memcached is running already.
Also you can use phpMemcachedAdmin to see right on your browser.
Memcached open port (11211) on iptables firewall
If memcached is installed somewhere other than the local machine, you will need to make sure it has access through your iptables firewall.
Use the following command
Restart iptables firewall
Installing Memcached and Memcache PHP Module on CentOS
For Memcached to work with PHP, we need to install the PHP module.
PHP 5.5
PHP 5.6
Finally launch PHP and web server
Install Memcached with WordPress
To use Memcached with WordPress, you should install the plugin W3 Total Cacheâ€.
In the plugin settings, select the caching method as Memcached cache page for the module Page Cache and Object Database Cache.
Now, let's enjoy the speed that Memcached provides.
Good luck!
Models of Memcached operations:
In this article, I will guide you how to install Memcached on CentOS 7/6/5.
Install Memcached
- Install repository for CentOS 5 Remi (CentOS 7 and 6 do not need this step)
Code:
Dependency on CentOS 5 ## Remi
rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-5.rpm
Code:
## CentOS 7 and 6
yum install memcached
## CentOS 5
yum install memcached --enablerepo = remiConfigure Memcached
The most important parameters to keep in mind is that Cachesize unit is MB. For example, below I used to 128MB cache (default 64MB)
Code:
nano / etc / sysconfig / memcached
PORT = "11211"
USER = "memcached"
Maxconn = "1024"
CacheSize = "128"
OPTIONS = ""
Code:
chkconfig memcached on
memcached service start
Code:
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 14
bytes_written 768
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 536870912
listen_disabled_num 0
pid 1232
pointer_size 64
rusage_system 0.000999
rusage_user 0.000000
4 threads
time 1402941264
total_connections 12
TOTAL_ITEMS 0
uptime 114
version 1.4.4Also you can use phpMemcachedAdmin to see right on your browser.
Memcached open port (11211) on iptables firewall
If memcached is installed somewhere other than the local machine, you will need to make sure it has access through your iptables firewall.
Use the following command
Code:
iptables -A INPUT -m state -m tcp -p tcp --ctstate NEW -j ACCEPT --dport 11211
Code:
service iptables restartInstalling Memcached and Memcache PHP Module on CentOS
For Memcached to work with PHP, we need to install the PHP module.
PHP 5.5
Code:
yum --enablerepo = remi, remi-install php-pecl-php55 php-pecl-memcache memcached
Code:
yum --enablerepo = remi, remi-install php-pecl-php56 php-pecl-memcache memcached
Code:
php-fpm service restart
nginx service restartTo use Memcached with WordPress, you should install the plugin W3 Total Cacheâ€.
In the plugin settings, select the caching method as Memcached cache page for the module Page Cache and Object Database Cache.
Now, let's enjoy the speed that Memcached provides.
Good luck!
