Ubuntu memcached Installation and configuration

Divided into two procedures: Memcache server-side installation and memcached client installation.

The so-called server-side installation is on the server (typically Linux system) on the installation of Memcache implementation data storage

The so-called client installation means PHP (or other programs, memcache and other good API interface) to use the server-side memcache provided functions, the need for PHP to add extensions.

1) Install Memcache service End

sudo apt-get install memcached

After installing the Memcache server, we need to start the service:

memcached-d-M 128-p 11111-u root

Here you need to explain the startup parameters for the memcached service:

-P Listening Port

The IP address of the-l connection, the default is native

-D Start memcached service

-D Restart Restart memcached service

-D Stop|shutdown shut down the running memcached service

-D Install installation memcached service

-d Uninstall Uninstall memcached service

-U Run as (only valid when run as root)

-m maximum memory usage, in MB. Default 64MB

-Returns an error when M memory is exhausted instead of deleting the item
-C Maximum Simultaneous connection number, default is 1024

-F Block size growth factor, default is 1.25-n minimum allocation space, key+value+flags default is 48
-H Display Help

2 Install Memcache client (PHP5 for example)

sudo apt-get install Php5-memcache

After installation we need to do a simple configuration in the php.ini, open the/etc/php5/apache2/php.ini file at the end to add the following:

[Memcache]

; Whether to transparently failover to other servers when an error is encountered.

Memcache.allow_failover = On

; The maximum number of servers to try when accepting and sending data, only when opening memcache.allow_failover. Memcache.max_failover_attempts = 20

Data is transferred according to the block size set by this value. The smaller the value, the more network traffic is required.

; If you find an unexplained rate decrease, you can try to increase this value to 32768.

Memcache.chunk_size = 8192

; The default TCP port to use when connecting to the memcached server.

Memcache.default_port = 11111

; Controls the policy that maps the key to the server. The default value "Standard" represents the old hash policy using the previous version.

; Set to "consistent" allows you to add/Remove servers in a connection pool without having to recalculate the mapping relationship between key and server.

; memcache.hash_strategy = "standard"; Controls the hash function that maps the key to the server. The default value, Crc32″, uses the CRC32 algorithm, whereas "FNV" means the FNV-1A algorithm is used.

; The fnv-1a is slightly lower than the CRC32 speed, but the hash effect is better.

; memcache.hash_function = "Crc32″

finally , save the php.ini and perform the sudo/etc/init.d/apache2 restart restart Apache.

3 The use of memcache in PHP

<?php

$mem = new Memcache; Creating Memcache Objects

$mem->connect ("127.0.0.1″, 11111"); Connecting Memcache servers

$val = "This is a memcache test.";

$key = MD5 ($val);

$mem->set ($key, $val, 0, 120); Add a cache insertion, cache time of 120s

if (($k = $mem->get (' key ')) {//To determine whether to get the specified key

Echo ' Fromcache: '. $k;

} else {

echo ' normal '; Here we need to replace the query database and create the cache in actual use.

}

?>

so far, through the above steps, we have completed the Memcache configuration and basic use ...

4) Php5-memcache extension provided method

Memcache::add-adds a value and returns False if it already exists
memcache::addserver-add a server address to use
Memcache::close-closes a Memcache object
memcache::connect-Create a Memcache object
memcache_debug-Control Debugging function
Memcache::d ecrement-to subtract values from a key that is saved
Memcache: Delete a key value:d elete-
memcache::flush-clears all cached data
Memcache::get-gets a key value
memcache::getextendedstats-get run System statistics for all processes in the process pool
memcache::getserverstatus-get the parameters to run the server
memcache::getstats-returns some running statistics for the server
memcache::getversion-returns the version information of the running Memcache
memcache::increment-an addition to the value in a key that is saved
Memcache: Create a Memcache Persistent connection object:p connect-
Memcache::replace-r Overwrite an existing key
memcache::set-Add a value, if it already exists, overwrite
memcache::setcompressthreshold-compression of data larger than a certain size
memcache::setserverparams-Modify server parameters at run time

The following is the installation and use of memcached on the operating system Ubuntu 10.04:

1. Download decompression, install Libevent

mkdir ~/SRC

CD ~/SRC

Wgethttp://www.monkey.org/~provos/libevent-2.0.10-stable.tar.gz

Tar xzvf libevent-2.0.10-stable.tar.gz

CD libevent-2.0.10-stable

./configure--prefix=/usr

Make

sudo make install

Cd..

2. Test whether the Libevent is installed successfully:

# Ls-al/usr/lib | grep libevent

3. Download decompression, install memcached

Wgethttp://memcached.googlecode.com/files/memcached-1.4.5.tar.gz

Tar xzvf memcached-1.4.5.tar.gz

CD memcached-1.4.5

./configure--with-libevent=/usr

Make

sudo make install

Cd..

4. Test for successful installation of memcached:

# ls-al/usr/local/bin/mem*

5. Start the Memcache server side:

#/usr/local/bin/memcached-d-M 10-u root-l127.0.0.1-p 11211-c 256-p/tmp/memcached.pid

The-D option is to start a daemon,

-M is the amount of memory allocated to Memcache, in megabytes, I am 10MB here,

-U is the user running memcache, I am here root,

-L is a listening server IP address, if there are more than one address, I specify the IP address of the server 127.0.0.1,

-P is the port that sets the memcache listening, I set 11211 here, preferably 1024 or more ports,

The-c option is the maximum number of concurrent connections to run, the default is 1024, I set 256 here, according to the load of your server to set,

-P is set to save the Memcache pid file, which I am here to save in/tmp/memcached.pid,

6. If you want to end the memcache process, execute:

# Kill ' Cat/tmp/memcached.pid '

You can also start multiple daemons, but the ports cannot be duplicated.

7. Restart Web Services

/etc/init.d/lighttpd-flighttpd.conf Restart

8. Memcache Environment test:

telnet localhost 11211

Save

Set

Good 32 0 10

HelloWorld

STORED

Retrieve

Gets good

VALUE Good 32 10 10

HelloWorld

End

Replace

Replace good 32 0 10

Worldhello

STORED

Get good

VALUE Good 32 10

Worldhello

End

Tail add

Append Good 32 0 5

After

STORED

Get good

VALUE Good 32 15

Worldhelloafter

End

Head add

Prepend Good 32 0 6

Before

STORED

Get good

VALUE Good 32 21

Beforeworldhelloafter

End

Delete

Delete Good

DELETED

Get good

End

Install server

sudo apt-get install memcached

$ memcached-d-M 50-p 11211-uroot

Parameter Description-m specifies the number of megabytes of cache space to use;-p specifies the port to listen to, and-u specifies which user to run

Installing PHP Modules

sudo apt-get install Php5-memcache

Edit configuration file

$ sudo vim/etc/php5/conf.d/memcache.ini

; Uncomment the next line to Enablethe module

extension=memcache.so

 

[Memcache]

memcache.dbpath= "/var/lib/memcache"

memcache.maxreclevel=0

memcache.maxfiles=0

memcache.archivememlim=0

memcache.maxfilesize=0

memcache.maxratio=0

 

$mem = new Memcache;

$mem->connect ("127.0.0.1", 11211);

$mem->set (' key ', ' This is amemcached test! ', 0);

$val = $mem->get (' key ');

echo $val;