#June 2014

Linux, PHP

Install MongoDB and Mongo PHP in Ubuntu

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I am using Ubuntu Server 14.04 OS for my working enviroment. All steps below is way I implemented successfully on my machine. So now, I will show you how to install MongoDB and Mongo PHP driver.

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Firstly, install MongoDB. You can see it is so simple and one and only one command.

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sudo apt-get install mongodb

To make sure that MongDB is running, you can use command below

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thanhson1085@sonnst:~/projects$ ps -ef|grep mongo
245:mongodb   2870     1  4 11:52 ?        00:00:21 /usr/bin/mongod --config /etc/mongodb.conf
248:thanhso+  2905  1615  0 12:00 pts/0    00:00:00 grep --color=auto mongo

To install Mongo PHP Driver, you use the command below.

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sudo pecl install mongo

The command above use Pecl, so if you machine have not installed it yet. You can install easily by the command below

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sudo apt-get install php5-dev php5-cli php-pear

And now, you have to enable Mongo PHP extension by way add “extension=mongo.so” to php.ini file or use the commands below

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sudo -s
echo "extension=mongo.so" > /etc/php5/mods-available/mongo.ini
php5enmod mongo
exit

Almost done, just need to check that your job is done or not.

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thanhson1085@sonnst:~$ php -i|grep mongo
16:/etc/php5/cli/conf.d/20-mongo.ini,
330:mongo
343:mongo.allow_empty_keys => 0 => 0
344:mongo.chunk_size => 261120 => 261120
345:mongo.cmd => $ => $
346:mongo.default_host => localhost => localhost
347:mongo.default_port => 27017 => 27017
348:mongo.is_master_interval => 15 => 15
349:mongo.long_as_object => 0 => 0
350:mongo.native_long => 1 => 1

And writing a php script to create document, collection and insert data to mongodb.

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<?php
 
// connect
$m = new MongoClient();
 
// select a database
$db = $m->test1;
 
// select a collection (analogous to a relational database's table)
$collection = $db->colection_test;
 
// add a record
$document = array( "title" => "New One", "author" => "Nguyen Sy Thanh Son" );
$collection->insert($document);
 
// add another record, with a different "shape"
$document = array( "title" => "The Second One", "online" => true );
$collection->insert($document);
 
// find everything in the collection
$cursor = $collection->find();
 
// iterate through the results
foreach ($cursor as $document) {
    echo $document["title"] . "\n";
}
 
?>

If success, the output will be same as the below

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$ sudo php test.php
New One
The Second One

 

Nguyen Sy Thanh Son

4

GIT, Linux, VIM

Vim install Vumdle

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To read this article, you have to make sure that you know linux command and your machine was installed VIM, GIT.

Firstly, install vumdle plugin by command:

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$ git clone https://github.com/gmarik/Vundle.vim.git ~/.vim/bundle/Vundle.vim

And then,you go to your home directory and look for .vimrc. Open it and add lines below

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set nocompatible
filetype off
set rtp+=~/.vim/bundle/Vundle.vim/
call vundle#begin()
 
Plugin 'gmarik/Vundle.vim'
# Add any plugin that you want to install it and make sure that you know plugin git name or git url
#Plugin 'https://github.com/ervandew/screen.git'
 
call vundle#end()
filetype plugin indent on

So now, you can open vim and type:

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:PluginInstall

And waiting for all plugin that you put to .vimrc file is installed completely.

Done!!!

Nguyen Sy Thanh Son

2

Linux

Set Static IP in Ubuntu Server

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To set static IP for Ubuntu Server, we just need to modify file /etc/network/interfaces. The example below shows that we set static IP for ethernet interface eth0 to 192.168.1.31

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auto eth0
iface eth0 inet static
address 192.168.1.31
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
dns-nameservers 8.8.8.8, 8.8.4.4
dns-search local
dns-domain local.domain

And on/off interface:

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sudo ifdown eth0
sudo ifup eth0

 

Nguyen Sy Thanh Son

0

Linux

Convert GIF to MP4 in Ubuntu

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To convert GIF file to MP4, we need implement two steps. The first step is convert git frames to png files. With this step, you need use ImageMagick. So you need make sure that your machine was installed ImaegMagick. The second step is convert the PNG file to MP4. We use AVCONV(ffmpeg) for this step. For further details, please take look to the steps below.

Convert GIF to MP4 in Ubuntu

Install ImageMagick (In Ubuntu)

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apt-get install imagemagick

Install AVCONV (ffmpeg)

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apt-get install libav-tools

Convert GIF frames to PNG images

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convert GIRL_layered_500x500.gif frame%02d.png

Compress multi png images to video MP4

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avconv -r 8 -i frame%02d.png -qscale 4 test.mp4

 

Nguyen Sy Thanh Son

2

Linux, PHP

Install PHP Redis in Ubuntu

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Redis is good solution to improve the performance of your system. You can use Redis as cache system or nosql DB.  I think that is is easy to use it but not easy to think how and where.

Step 1,  install redis, phpize

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sudo apt-get install redis-server

Test redis:

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$ redis-cli ping
PONG

Install phpize

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sudo apt-get install php5-dev

Step 2,  download phpredis source code from git

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git clone git://github.com/nicolasff/phpredis.git

If you have not installed git yet, you can use this command line:

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sudo apt-get install git-core

Step 3, compile and install phpredis,

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cd phpredis
phpize
./configure
make
make install

Step 3, enable phpredis extension

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sudo -s
echo "extension=redis.so">/etc/php5/mods-available/redis.ini
php5enmod redis
exit

Step 4, test

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root@sonnst:~# php -i|grep redis
21:/etc/php5/cli/conf.d/20-redis.ini
466:redis
479:Registered save handlers => files user redis
715:This program is free software; you can redistribute it and/or modify

Writing a php script to test

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<?php
        $redis=new Redis() or die("Can'f load redis module.");
        $redis->connect('127.0.0.1');
        $redis->set('testkey', 1);
        echo $redis->get('testkey'); die();

Doing some quick and dirty benchmark

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$time for i in `seq 1 1000`; do php test.php; done
 
real 0m20.233s
user 0m9.225s
sys 0m7.636s

 

Good luck,

Nguyen Sy Thanh Son

6

AngularJS

AngularJS, Set Image always in the center of DIV

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Will have a time you need set email always in the center of DIV tag, even it is horizontal or vertical image. So now, I shared a angularjs directive that will do it for you. In this code, It will cacth event image loaded and check image is horizontal or vertical and set a suitable margin and position.

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app.directive 'centerImage', ()->
        restrict: 'ACE',
        link: ($scope, element, attrs, ctrl) ->
                element.bind 'load', ->
                        if (element[0].width > element[0].height)
                                element[0].style.marginTop = (element[0].width -  element[0].height)/2 + 'px'

 

Nguyen Sy Thanh Son

2

AngularJS, Phonegap

AngularJS and Scroll lazy load directive

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Lazy load is a familiar task when you work with web application. For example,  when you scroll your application to the bottom of page, you want to load more data from server side. This will make a better user experience and app performance.

In angularJS, you should create a directive that will catch scroll event and call load more data function in controller when user scroll to bottom of page.

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.directive("loadMoreData", [function() {
        return {
            restrict: 'ACE',
            link: function($scope, element, attrs, ctrl) {
                var raw = element[0];
                element.scroll(function() {
                    if (raw.scrollTop + raw.offsetHeight >= raw.scrollHeight){
                        $scope.$apply("loadMoreData()");
                    }
                });
            }
        };
 
}])

loadMoreData() function is wrote in Controller that will handle task load more data from server and bind to $scope

 

Nguyen Sy Thanh Son

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