Memcached¶

Synopsis¶

The major aspect of this module is to install and update the memcache with the latest version. Memcached is a general-purpose distributed memory caching system. It is often used to speed up dynamic database-driven websites by caching data and objects in RAM to reduce the number of times an external data source (such as a database or API) must be read.

Let us see about the process of installing and using this module in upcoming topics.

Help Command¶

The help command guides the users regarding the purpose and as well as about the options that are included in the Memcached module. It lists out the alternative parameters of Memcached module. It also describes the syntax for installing the Memcached module. The help command for Memcached module is shown as below.

ptconfigure Memcached help

The syntax for declaring the help command is not case sensitive which is an added advantage. The following screenshot visualize you about the help command under Memcached.

kevell@corp:/# ptconfigure Memcached help

******************************


 This command allows you to update Memcached.

 Memcached, memcached

       - install
       Installs the latest version of memcache
       example: ptconfigure memcached install

------------------------------
End Help
******************************

Installation¶

The command used for installing the Memcached in the users machine is shown below:

ptconfigure memcached install

After inputting the command above, the following process occurs as shown in the tabular format.

Parameters	Alternative Parameters	Options	Comments
Install Memcached? (Y/N)	Instead of memcached, we can use Memcached also.	Y(Yes)	If the user wish to proceed the installation process they can input as Y.
Install Memcached? (Y/N)	Instead of memcached, we can use Memcached also.	N(No)	If the user wish to quit the installation process they can input as N.\|

The following screenshot can give you an pictorial representation regarding the process of installation.

kevell@corp:/# ptconfigure memcached install
Install Memcached? (Y/N)
y
*******************************
*        Pharaoh Tools        *
*         Memcached!        *
*******************************
Creating /tmp/ptconfigure-temp-script-43944931598.sh
chmod 755 /tmp/ptconfigure-temp-script-43944931598.sh 2>/dev/null
Changing /tmp/ptconfigure-temp-script-43944931598.sh Permissions
Executing /tmp/ptconfigure-temp-script-43944931598.sh
Ign http://dl.google.com stable InRelease
Hit http://dl.google.com stable Release.gpg
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Ign http://us.archive.ubuntu.com precise-security InRelease
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Ign http://downloads-distro.mongodb.org dist InRelease
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Get:6 http://us.archive.ubuntu.com precise-updates Release.gpg [198 B]
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  HttpError404
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  HttpError404
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Hit http://downloads-distro.mongodb.org dist Release.gpg
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Get:29 http://archive.ubuntu.com trusty-updates/restricted amd64 Packages [9,238 B]
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Get:31 http://www.apache.org 21x/main amd64 Packages [698 B]
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Hit http://apt.newrelic.com newrelic Release
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Get:38 http://archive.ubuntu.com trusty-updates/universe i386 Packages [262 kB]
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Get:39 http://archive.ubuntu.com trusty-updates/restricted i386 Packages [9,256 B]
Get:40 http://archive.ubuntu.com trusty-updates/multiverse i386 Packages [11.9 kB]
Get:41 http://archive.ubuntu.com trusty-updates/main i386 Packages [477 kB]
Hit http://downloads-distro.mongodb.org dist/10gen amd64 Packages
Hit http://downloads-distro.mongodb.org dist/10gen i386 Packages
Hit http://archive.ubuntu.com trusty-updates/main Translation-en
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Ign http://repo.mysql.com trusty/mysql-5.6 Translation-en_IN
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Fetched 7,633 kB in 2min 57s (43.1 kB/s)
Temp File /tmp/ptconfigure-temp-script-43944931598.sh Removed
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
mysql-server-5.5 : Depends: mysql-client-5.5 (>= 5.5.41-0ubuntu0.14.04.1)
[Pharaoh Logging] Adding Package mysql-server-5.5 from the Packager Apt did not execute correctly
[Pharaoh Logging] Package mysql-server from the Packager Apt is already installed, so not installing
[Pharaoh Logging] Package php5-mysql from the Packager Apt is already installed, so not installing
[Pharaoh Logging] Package php5 from the Packager Apt is already installed, so not installing
Reading package lists...
Building dependency tree...
Reading state information...
The following packages were automatically installed and are no longer required:
  java-wrappers libjargs-java pear-channels php5-xdebug
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  php-pear
Suggested packages:
 php5-dev
The following NEW packages will be installed:
 php-pear php5-memcached
0 upgraded, 2 newly installed, 0 to remove and 34 not upgraded.
Need to get 0 B/307 kB of archives.
After this operation, 2,475 kB of additional disk space will be used.
Selecting previously unselected package php-pear.
(Reading database ... 362745 files and directories currently installed.)
Preparing to unpack .../php-pear_5.5.9+dfsg-1ubuntu4.7_all.deb ...
Unpacking php-pear (5.5.9+dfsg-1ubuntu4.7) ...
Selecting previously unselected package php5-memcached.
Preparing to unpack .../php5-memcached_2.1.0-6build1_amd64.deb ...
Unpacking php5-memcached (2.1.0-6build1) ...
Processing triggers for doc-base (0.10.5) ...
Processing 1 added doc-base file...
Setting up php-pear (5.5.9+dfsg-1ubuntu4.7) ...
Setting up php5-memcached (2.1.0-6build1) ...
[Pharaoh Logging] Adding Package php5-memcached from the Packager Apt executed correctly
Reading package lists...
Building dependency tree...
Reading state information...
The following packages were automatically installed and are no longer required:
 java-wrappers libjargs-java pear-channels php5-xdebug
Use 'apt-get autoremove' to remove them.
Suggested packages:
 libcache-memcached-perl libmemcached
The following NEW packages will be installed:
 memcached
0 upgraded, 1 newly installed, 0 to remove and 34 not upgraded.
Need to get 66.7 kB of archives.
After this operation, 229 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu/ trusty/main memcached amd64 1.4.14-0ubuntu9 [66.7 kB]
Fetched 66.7 kB in 2s (24.0 kB/s)
Selecting previously unselected package memcached.
(Reading database ... 362947 files and directories currently installed.)
Preparing to unpack .../memcached_1.4.14-0ubuntu9_amd64.deb ...
Unpacking memcached (1.4.14-0ubuntu9) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Processing triggers for ureadahead (0.100.0-16) ...
Setting up memcached (1.4.14-0ubuntu9) ...
Starting memcached: memcached.
Processing triggers for ureadahead (0.100.0-16) ...
[Pharaoh Logging] Adding Package memcached from the Packager Apt executed correctly
... All done!
*******************************
Thanks for installing , visit www.pharaohtools.com for more
******************************


Single App Installer:
--------------------------------------------
Memcached: Success
------------------------------
Installer Finished
******************************

Functions of memcached¶

While using the memcached, the process can read and implement the following functions that are included in memcached,

Memcache::add — Add an item to the server
Memcache::addServer — Add a memcached server to connection pool
Memcache::close — Close memcached server connection
Memcache::connect — Open memcached server connection
Memcache::decrement — Decrement item’s value
Memcache::delete — Delete item from the server
Memcache::flush — Flush all existing items at the server
Memcache::get — Retrieve item from the server
Memcache::getExtendedStats — Get statistics from all servers in pool
Memcache::getServerStatus — Returns server status
Memcache::getStats — Get statistics of the server
Memcache::getVersion — Return version of the server
Memcache::increment — Increment item’s value
Memcache::pconnect — Open memcached server persistent connection
Memcache::replace — Replace value of the existing item
Memcache::set — Store data at the server
Memcache::setCompressThreshold — Enable automatic compression of large values
Memcache::setServerParams — Changes server parameters and status at runtime

Benefits¶

The parameters used in help and installation are not case sensitive which is an added advantage while compared to others.
It is well-to-do in both Ubuntu and as well as Cent OS.
This will module installs the memcached in updated version.
If the module is already existing in the user machine it will display a message as it is already existing.