Arvind Kushwah Web Developer and Software Consultant

Introduction In this tutorial, we will demonstrate how to install Phusion Passenger as your Rails-friendly web server, which is easy to install, configure, and maintain. We will integrate it into Apache on Ubuntu 14.04. By the end of this tutorial, we will have a test Rails application deployed on our Droplet. If you prefer Nginx over Apache, take a look at how to deploy a Rails app with Passenger and Nginx on Ubuntu 14.04 by following the link. Prerequisites The first step is to create a new Droplet. For smaller sites it is enough to use the 512 MB plan. You may want to choose the 32-bit Ubuntu image because of smaller memory consumption (64-bit programs use about 50% more memory then their 32-bit counterparts). However, if you need a bigger machine, or there is a chance that you will upgrade to more than 4 GB of RAM, you should consider the 64-bit version. Be sure to use Ubuntu 14.04. At the time of this writing, Ubuntu 14.10 does not have a Passanger...

If you are trying to connect mysql using password or without password like mysql -u USERNAME or mysql -u USERNAME -p PASSWORD and getting error:-   Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) find first socket location sudo find / -type s my be location would be /tmp/mysql.sock just go in the mysql file my.cnf sudo nano  /etc/mysql/my.cnf and do changes in scocket port            = 3306 socket          = /tmp/mysql.sock [mysqld_safe] socket          = /tmp/mysql.sock nice            = 0 Restart mysql, sudo /etc/init.d/mysql restart And try login again mysql -u USERNAME Hope it will work. Command to know all the mysql variable sudo mysqladmin variables To know mysql socket path mysqld --verbose --help | ...

sudo nano hooks/post-receive #!/bin/bash while read oldrev newrev ref do     if [[ $ref =~ .*/master$ ]];     then         echo "Master ref received.  Deploying master branch to production..."         git --work-tree=/home/ec2-user/ywrstaging/ywroom-staging --git-dir=/home/ec2-user/proj checkout -f       # sudo  /etc/init.d/nginx restart        cd /home/ec2-user/ywrstaging/ywroom-staging &&  source ~/.rvm/scripts/rvm && bundle install && rake db:migrate        sudo  /etc/init.d/nginx restart     else         echo "Ref $ref successfully received.  Doing nothing: only the master branch may be deployed on this server."     fi done

Introduction Version control has become a central requirement for modern software development. It allows projects to safely track changes and enable reversions, integrity checking, and collaboration among other benefits. The git version control system, in particular, has seen wide adoption in recent years due to its decentralized architecture and the speed at which it can make and transfer changes between parties. While the git suite of tools offers many well-implemented features, one of the most useful characteristics is its flexibility. Through the use of a "hooks" system, git allows developers and administrators to extend functionality by specifying scripts that git will call based on different events and actions. In this guide, we will explore the idea of git hooks and demonstrate how to implement code that can assist you in automating tasks in your own unique environment. We will be using an Ubuntu 14.04 server in this guide, but any system that c...

Step by Step This article demonstrates how one of our users increased a root EBS volume from 8GB to 30GB. In order to accomplish this, we will show you how once you launch a Linux-based EC2 instance, you can increase the size of your EBS volume using snapshots. All you need to do is launch an instance, create a snapshot from the volume that is attached to the launched instance, then create a new, bigger volume.   Below is a step by step guide that will clarify how to perform this task: First, you need to successfully launch an EC2 instance with EBS as its root device. The root EBS volume is used as a reference, so you can follow the same step for all of the volumes. Next, connect the instance via PuTTY (in Windows machines) or an SSH client (in Linux machines). We are using PuTTY for our exercise. Run the command “df –h”. It will display the drive’s details before resizing. To increase the size of the root volume, since this is an EBS-backed instance, first stop ...

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 https://www.linode.com/docs/assets/660-init-deb.sh # Move the script to the init.d directory & make executable sudo mv init-deb.sh /etc/init.d/nginx sudo chmod +x /etc/init.d/nginx # Add nginx to the system startup sudo /usr/sbin/update-rc.d -f nginx defaults Now we can control nginx using: sudo service nginx stop sudo service nginx start sudo service nginx restart sudo service nginx reload

GRANT ALL PRIVILEGES ON mydb.* TO 'myuser'@'%' WITH GRANT OPTION; OR This is old question but I don't think the accepted answer is safe. It's good for creating a super user but not good if you want to grant privileges on a single database. grant all privileges on mydb.* to myuser@'%' identified by 'mypasswd'; grant all privileges on mydb.* to myuser@localhost identified by 'mypasswd';

Add gem 'shoulda-callback-matchers' In app/models/user.rb class User < ActiveRecord::Base   after_create :create_usersetting   before_destroy :delete_user_information end In spec/models/user_spec.rb  require "rails_helper"  require 'factory_girl_rails' describe User do   before(:each) do     @user = User.create(:email=>"example@gmail.com",:password=>"1234578")   end it "should trigger create_usersetting on after create" do      should callback(:create_usersetting).after(:create)        end        it  "should trigger delete_user_information on before destroy" do       is_expected.to callback(:delete_user_information).before(:destroy)     end end

Put below methods in application helper then you can call devise form on any controller.  module ApplicationHelper   def resource_name     :user    end   def resource     @resource ||= User.new   end   def devise_mapping     @devise_mapping ||= Devise.mappings[:user]   end end

apt-get install wkhtmltopdf apt-get install xvfb echo 'xvfb-run --server-args="-screen 0, 1024x768x24" /usr/bin/wkhtmltopdf $*' > /usr/bin/wkhtmltopdf.sh chmod a+rx /usr/bin/wkhtmltopdf.sh ln -s /usr/bin/wkhtmltopdf.sh /usr/local/bin/wkhtmltopdf wkhtmltopdf http://www.google.com output.pdf

Put this in your ~/.profile or ~/.bashrc : # This loads RVM into a shell session.     [[ - s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" So you don't have to manually type it for every session. And yes it is needed if you want to use rvm

 To Export .sql mysqldump -u [username] -p [database name] > [database name].sql To Import:- mysql -u [username] -p newdatabase < [database name].sql

Change   /etc/mysql/my.cnf Change   /etc/mysql/my.cnf And It could be that you have not configured the   Amazon Security Group   assigned to your EC2 Instance to accept incoming requests on port 3306 (default port for MySQL). If this is the case then you can easily open up the port for the security group in a few button clicks: 1) Log into you AWS Console and go to 'EC2' 2) On the left hand menu under 'Network & Security' go to 'Security Groups' 3) Check the Security Group in question 4) Click on 'Inbound tab' 5) Choose 'MYSQL' from drop down list and click 'Add Rule' Might not be the reason but worth a go... Once, you are logged in, you need to create a new MySQL user. First, issue the following command to login with the root user  mysql -u root -p If a password is set provide the password and login. Now create a new user with this command create user 'bill'@'%' identified by 'so...

  <%= link_to "Export Recipes CSV", download_recipes_path(format: "csv") %> In Controller:-  def download     @recipes = Recipe.order(:name)         send_data @recipes.as_csv ,:filename => 'recipes'   end In Model:-  #For Specific fields   def self.as_csv     CSV.generate do |csv|       csv << [ "Name", "serving_size", "recipe_type", "ingredients", "method", "nutritional_analysis","trainer_id", "recipetags_ids", "description"] ## Header values of CSV       all.each do |recipe|                csv << [recipe.name, recipe.serving_size, recipe.recipe_type, recipe.ingredients, recipe.method, recipe.nutritional_analysis, recipe.trainer_id, recipe.recipetaggings.collect(&:recipetag_id).join(''), recipe.description] ##Row values of CSV    ...

Hi Guy, This is the  command to open other skype on same system in ubuntu $ skype --dbpath=~/.Skype2

Hi Guys, http://prose.io  is the tool to provide github pages editing functionality. To open you github pages for editing you just need to add github username with prefix # like as http://prose.io/# githubusername/

Hi Guys, I have added bootstrap progress bar when uploading csv file.  Submit form using Ajax:-        <%= form_for @company, :url=>company_upload_path, :html => {multipart: true,:class=>"upload_form",:remote=>true,:id=>"new_company"} do |f| %>                           <%= file_field_tag "file",:class=>"form-control btn btn-default",:id=>"model_file" %>               <%= f.button 'Import', :class => 'submit  btn btn-primary import_button' %>             <% end %> Add progress-bar div when you want to show progress bar and give its initial width 0. <div class="progress" id = "import-campaign-bar">           <div  class="progress-bar progress-bar-success" style="width: 0%"></div> </div> ...

I follow the convention; Procfile defines all processes .foreman set specific foreman variables Development: .env sets environment variables for each developer .env.example sets defaults for development foreman start starts all processes Production: heroku config sets environment variables heroku ps:scale turns on or off whichever processes are needed for production Here's an example from a project. Procfile: web : bundle exec unicorn_rails - p $PORT - c ./ config / unicorn . rb worker : bundle exec rake jobs : work search : bundle exec rake sunspot : solr : run .env.example: # default S3 bucket S3_KEY = keykeykeykeykeykey S3_SECRET = secretsecretsecret S3_BUCKET = myapp - development .env # developer's private S3 bucket S3_KEY = mememememememememe S3_SECRET = mysecretmysecret S3_BUCKET = myapp - development .foreman: # development port is 3000 port : 3000

do_not_validate_attachment_file_type :file

<div id="post_content" contenteditable="true" class="post_content_textarea">         </div> <script> var availableTags = <%= raw @users %>;  var availableTags_category = <%= raw @categories %>;    function split(val) {       return val.split(/@\s*/); } function split2(val) {       return val.split(/#\s*/); } function extractLast(term) {     return split(term).pop(); } function extractLast2(term) {     return split2(term).pop(); }   $(".post_content_textarea")   // don't navigate away from the field on tab when selecting an item   .bind("keydown", function(event) {       if (event.keyCode === $.ui.keyCode.TAB && $(this).data("autocomplete").menu.active) {           event.preventDefault();       }   }).autocomplete({ ...