In this how to i will describe how to install memcached on your server with PHP Extension. memcached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. My server is running CentOS 5.3 with CPanel.
1) Install memcached.
Enable rpmforge respository to install latest memcached rpm using yum.
For i386 / i686
rpm -Uhv http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
For x86_64
rpm -Uhv http://apt.sw.be/redhat/el5/en/x86_64/rpmforge/RPMS//rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
Use yum to install memcached
yum -y install memcached
As soon as memcached installation completed, edit options for memcached in /etc/sysconfig/memcached to meet your need.
vi /etc/sysconfig/memcached
PORT=”11211″ #define on which port to urn
USER=”nobody” #same as apache user
MAXCONN=”1024″ #maximum number of connections allowed
CACHESIZE=”64″ #memory used for caching
OPTIONS=”" #use for any custom options
Save the file. All options can be seen by using following command
memcached -h
Start memcached
/etc/init.d/memcached start
Starting Distributed memory caching (memcached): [ OK ]
to check the running status of memcached
/etc/init.d/memcached status
memcached (pid 6475) is running…
and
netstat -anp | grep 11211
tcp 0 0 :::11211 :::* LISTEN 6475/memcached
udp 0 0 0.0.0.0:11211 0.0.0.0:* 6475/memcached
2) Install PHP Extension.
Download and install latest stable memcache version from PECL.
cd /usr/src
wget http://pecl.php.net/get/memcache-2.2.5.tgz
tar zxvf memcache-2.2.5.tgz
cd memcache-2.2.5
phpize
./configure
make
make install
memcache.so will be install in php modules directory, now enable memcache.so extension in php.ini
To find out your php.ini location, execute following command
php -i | grep php.ini
Configuration File (php.ini) Path => /usr/local/lib
Loaded Configuration File => /usr/local/lib/php.ini
vi /usr/local/lib/php.ini
extension = “memcache.so”
save the file and restart httpd server.
/etc/init.d/httpd restart
To check is memcache extension loaded in php, execute following command.
php -i | grep memcache
memcache
memcache support => enabled
memcache.allow_failover => 1 => 1
memcache.chunk_size => 8192 => 8192
memcache.default_port => 11211 => 11211
memcache.default_timeout_ms => 1000 => 1000
memcache.hash_function => crc32 => crc32
memcache.hash_strategy => standard => standard
memcache.max_failover_attempts => 20 => 20
Registered save handlers => files user sqlite memcache
PWD => /usr/src/memcache-2.2.5
_SERVER["PWD"] => /usr/src/memcache-2.2.5
_ENV["PWD"] => /usr/src/memcache-2.2.5
This information can also be seen using phpinfo().
http://www.cyberciti.biz/faq/rhel-fedora-linux-install-memcached-caching-system-rpm/
ow do I install memcached a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load under CentOS / RHEL / Fedora / Redhat Linux?
Memcached is very fast caching system for MySQL. It uses libevent or epoll (Linux runtime) to scale to any number of open connections and uses non-blocking network I/O.
Required Packages
- memcached : High Performance, Distributed Memory Object Cache.
- memcached-selinux : SELinux policy module supporting memcached.
- perl-Cache-Memcached : Perl client for memcached.
- php-pecl-memcache : Php client / extension to work with the Memcached caching daemon.
- python-memcached : A Python memcached client library.
Step # 1: Turn on EPEL Repo
Type the following command to enable EPEL repo which carries required memcache packages.rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm
See this FAQ for further details.
Step # 2: Install memcached
Type the following command to install memcached with php extension:# yum install memcached php-pecl-memcache memcached-selinux
Sample outputs:
Loaded plugins: downloadonly, rhnplugin, security, verify
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package memcached.x86_64 0:1.2.8-1.el5 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
==============================================================================================================================================================
Package Arch Version Repository Size
==============================================================================================================================================================
Installing:
memcached x86_64 1.2.8-1.el5 epel 60 k
Transaction Summary
==============================================================================================================================================================
Install 1 Package(s)
Update 0 Package(s)
Remove 0 Package(s)
Total download size: 60 k
Is this ok [y/N]: y
Downloading Packages:
memcached-1.2.8-1.el5.x86_64.rpm | 60 kB 00:00
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : memcached 1/1
Installed:
memcached.x86_64 0:1.2.8-1.el5
Complete!
Step # 3: Configure memcached
Edit /etc/sysconfig/memcached, enter:# vi /etc/sysconfig/memcached
Update it as follows:
PORT="11211"
USER="memcached"
# max connection 2048
MAXCONN="2048"
# set ram size to 2048 - 2GiB
CACHESIZE="4096"
# listen to loopback ip 127.0.0.1, for network connection use real ip e.g., 10.0.0.4
OPTIONS="-l 127.0.0.1"
The above will starts memcached up as a daemon, using 4GB of memory, and listening on IP 127.0.0.1, port 11211. Save and close the file.
Step # 4: Run memcached
Type the following command to start memcached, enter:# chkconfig memcached on
# service memcached start
To stop / restart use the following commands:# service memcached stop
# service memcached restart
How Do I See Memory Memcached Slabs?
Type the following command:# memcached-tool IP_ADDRESS:Port
# memcached-tool IP_ADDRESS:Port display
# memcached-tool 127.0.0.1:11211
Sample outputs:
# Item_Size Max_age 1MB_pages Count Full?
1 104 B 5134 s 1 10 no
2 136 B 5135 s 1 40 no
3 176 B 0 s 1 0 no
4 224 B 2648 s 1 7 no
8 552 B 1810 s 1 12 no
9 696 B 1810 s 1 6 no
10 872 B 2935 s 1 8 no
11 1.1 kB 4262 s 1 18 no
12 1.3 kB 2990 s 1 23 no
13 1.7 kB 2434 s 1 22 no
14 2.1 kB 3489 s 1 11 no
15 2.6 kB 2964 s 1 16 no
16 3.3 kB 2861 s 1 14 no
17 4.1 kB 2076 s 1 5 no
18 5.2 kB 2981 s 1 5 no
20 8.1 kB 64 s 1 1 no
21 10.1 kB 1865 s 1 3 no
29 60.2 kB 1550 s 1 2 no
How Do I See Memory Memcached Stats?
Type the following command:# memcached-tool IP_Address:Port stats
# memcached-tool 127.0.0.1:11211 stats
Sample outputs:
#127.0.0.1:11211 Field Value
accepting_conns 1
bytes 399395
bytes_read 504797
bytes_written 17313658
cmd_flush 0
cmd_get 1141
cmd_set 248
connection_structures 9
curr_connections 5
curr_items 205
evictions 0
get_hits 898
get_misses 243
limit_maxbytes 1073741824
listen_disabled_num 0
pid 40159
pointer_size 64
rusage_system 0.227965
rusage_user 0.034994
threads 5
time 1255803547
total_connections 344
total_items 259
uptime 5829
version 1.2.8
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