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The nginx: unrecognized service error means the startup scripts need to be created.
Fortunately the startup scripts have already been written.

We can fetch them with wget and set them up following these steps:

# Download nginx startup script
wget -O init-deb.sh http://library.linode.com/assets/660-init-deb.sh

# Move the script to the init.d directory & make executable
sudo mv init-deb.sh /etc/init.d/nginx

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#Don’t Repeat Yourself (DRY) in Ruby on Rails

#DRY (Don’t Repeat Yourself)  is a principle of Software Development to reducing repetition of information or codes. We can #apply DRY quite broadly to database schema, test plan, system, even documentation. And in this post, we will take example of DRY #in Ruby on Rails development.

#In particular case, if you find some methods whose definitions are more or less similar, only different by the method name, it #may use meta programming to simplify the things to make your model more clean and DRY. Consider this simple example where we #have an article with three states.

#Before


class Article < ActiveRecord::Base

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2.0.0p247 :002 > u = User.create!(name:"test")
   (0.4ms)  BEGIN
  SQL (44.1ms)  INSERT INTO "users" ("created_at", "name", "updated_at") VALUES ($1, $2, $3) RETURNING "id"  [["created_at", Mon, 25 Nov 2013 19:35:06 UTC +00:00], ["name", "test"], ["updated_at", Mon, 25 Nov 2013 19:35:06 UTC +00:00]]
   (0.8ms)  COMMIT
 => #<User id: 1, name: "test", created_at: "2013-11-25 19:35:06", updated_at: "2013-11-25 19:35:06"> 
2.0.0p247 :003 > u.friends
  User Load (2.2ms)  SELECT "users".* FROM "users" INNER JOIN "friendships" ON "users"."id" = "friendships"."friend_id" WHERE "friendships"."user_id" = $1  [["user_id", 1]]
 => #<ActiveRecord::Associations::CollectionProxy []> 

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Import a large sql dump file to a MySQL database from command line
Posted on March 19, 2013 by cmanios
Today I had to import a very large SQL dump file (6 Gb) to a MySQL database using windows command line. If you are using linux it is the same. The process is the following:

Open a command prompt (or shell in Linux) with administrative privilleges
If you are in Windows set character set to unicode. Linux is using UTF-8 by default.
chcp 65001
Connect to a mysql instance using command line
$PATH_TO_MYSQL\mysql.exe -h 192.168.1.1 --port=3306 -u root -p
if you are in localhost you do not need host and port

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If you get following error, when you try to start nginx…

[emerg]: bind() to 0.0.0.0:80 failed (98: Address already in use)

Then it means nginx or some other process is already using port 80.

You can kill it using:

sudo fuser -k 80/tcp

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Asynchronous and deferred JavaScript execution explained

The HTML <script> element allows you to define when the JavaScript code in your page should start executing. The “async” and “defer” attributes were added to WebKit early September. Firefox has been supporting them quite a while already. Does your browser support the attributes?



Normal execution <script>
-------------------------------
This is the default behavior of the <script> element. Parsing of the HTML code pauses while the script is executing. For slow servers and heavy scripts this means that displaying the webpage will be delayed.

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<CORSConfiguration>
 <CORSRule>
   <AllowedOrigin>http://www.example.com</AllowedOrigin>

   <AllowedMethod>PUT</AllowedMethod>
   <AllowedMethod>POST</AllowedMethod>
   <AllowedMethod>DELETE</AllowedMethod>

   <AllowedHeader>*</AllowedHeader>
 </CORSRule>

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gzip  on;
    gzip_http_version 1.1;
    gzip_disable "msie6";
    gzip_vary on;
    gzip_min_length 1100;
    gzip_buffers 64 8k;
    gzip_comp_level 3;
    gzip_proxied any;
    gzip_types text/plain text/css application/x-javascript text/xml application/xml;

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http://blog.firmhouse.com/fancy-money-entry-for-your-rails-app-with-autonumeric-and-moneyrails

Creating fancy money entry for your Rails app

This week I was working on a client project where we wanted to implement a nice way of entering an amount of money. We wanted to replace a standard text input field with something like this:

Money entry sample

In the resulting implementation, when the user types the amount in the text box it automatically splits thousands and the decimal point.

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#Instructions

#Add the gems to your Gemfile:

gem 'fog'
gem 'carrierwave'
gem 'rmagick' # optional, for image resizing support

# Add the file './config/initializers/carrierwave.rb' for your CarrierWave configuration: