Thursday, September 26, 2013

Frequently used commands in Rails vs Slim

render :text => 'test'

# set layout
layout 'layout'

# print odd and even in table
tr class=cycle('list_line_odd', 'list_line_even')

# ruby inside javascript block [slim template]
  var config = { 
    custom: "#{my_value ? 'truthy' : 'falsy'}",
    current_user: #{raw current_user.to_json}

Monday, September 23, 2013

Solving “502 Bad Gateway” with nginx & php-fpm

After upgrading php-fpm, my PHP-based sites were returning “502 Bad Gateway” errors. Here’s how I managed to solve it.

Check to make sure that php-fpm is running with
ps auxww | grep php
– if you can’t see any php-fpm processes in the output, then you may need to re-install php-fpm. If php-fpm is running okay, then skip this first step.

sudo apt-get remove php5 php5-cgi php5-fpm

sudo apt-get install php5 php5-cgi php5-fpm

The thing to notice here is that the order in which you install the packages is important. In the past I have found that installing them in the wrong order causes the packages to be configured incorrectly.

Next, get php-fpm to listen on the correct host/port. In /etc/php5/fpm/pool.d/www.conf change the following line from:

listen = /var/run/php5-fpm.sock


listen =

Restart php-fpm with
sudo /etc/init.d/php5-fpm restart
and everything should work normally again.

server {
        listen 80;
        root /your_document_root;
        index index.php;
        access_log  /your_document_root/logs/access_log;
        error_log  /your_document_root/logs/error_log;

        location / {
                if (!-e $request_filename) {
                        rewrite ^(.*)$ /index.php last;

    location ~ \.php$ {
        include fastcgi_params;
        try_files $uri =404;
        # fastcgi_pass  unix:/var/run/php5-fpm.sock;
        fastcgi_param SCRIPT_FILENAME /your_document_root$fastcgi_script_name;
        fastcgi_index  index.php;


Install RabbitVCS Svn, Git Client On Ubuntu 12.10/12.04/11.10/11.04


There are some cool interfaces for subversion control for windows however when it comes to desktop linux distros, you find very few that can match their windows counterpart like TortoiseSVN. RabbitVCS is one such client that comes with all the bells and whistles. Here is a post about installing it.

First install some prerequisites.
$ sudo apt-get update

$ sudo apt-get install python-nautilus python-configobj python-gtk2 python-glade2 python-svn python-dbus python-dulwich subversion meld gconf-editor

Download the tarball, untar it and run the setup script
$ wget

$ tar jxvf rabbitvcs-0.15.2.tar.bz2

$ cd rabbitvcs-0.15.2/

$ sudo python install --install-layout=deb

Still inside the rabbitvcs-0.15.2 directory, cd to the nautilus-3.0 under the clients directory and copy the to the extensions dir

$ cd clients/nautilus-3.0
$ sudo cp /usr/share/nautilus-python/extensions/

Logout and log back in. Now create a folder and right click on it to see the RabbitVCS menu, perform a checkout.


Fix Error: Bomb icon
The bomb emblem means that there is some sort of error in the status checker.  It is possible that error messages will show up in ~/.config/rabbitvcs/RabbitVCS.log but I'm not sure it will for your problem.  I'm not sure what would cause your status checker to be getting errors but it could be that your svn or git dependencies are not correctly installed, or installed in a way that doesn't work with RabbitVCS.  Are the bomb emblems showing up in git repositories or svn repositories or both?

One thing that might help is restarting the status checker.  You can do this by killing the process.  Run "ps aux | grep rabbitvcs" and kill the process that says  Once you do that, restart nautilus and see what happens.

Friday, September 20, 2013

Ruby on Rails + Slim & Nginx + Unicorn

The first, you must install Ruby and Rails for your computer.
Deploy website on Nginx & Unicorn

Install Nginx
$ sudo apt-get install nginx
Setup virtual host for Nginx. Open file /etc/nginx/sites-available/ and add below lines:
server {
        listen 80;
        root /document_root;
        index index.php;
        #access_log  /var/nginx/access.log

Install Unicorn
$ gem install unicorn
Setup Unicorn to process request for Ruby Application on Nginx. Continue add more below lines into setup files of nginx
upstream unicorn {
  server unix:/tmp/unicorn.hello.sock fail_timeout=0;

server {
  listen 80 default deferred;
  root /home/taind/svn/demo/hello;

  try_files $uri/index.html $uri @unicorn;
  location @unicorn {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://unicorn;

  error_page 500 502 503 504 /500.html;
  client_max_body_size 4G;
  keepalive_timeout 10;
Add a boot loader file file Unicorn in document_root/config/unicorn.rb
root = "/home/taind/svn/demo/hello"
working_directory root
pid "#{root}/tmp/pids/"
stderr_path "#{root}/log/unicorn.log"
stdout_path "#{root}/log/unicorn.log"

listen "/tmp/unicorn.hello.sock"
worker_processes 2
timeout 30

# Force the bundler gemfile environment variable to
# reference the capistrano "current" symlink
before_exec do |_|
  ENV["BUNDLE_GEMFILE"] = File.join(root, 'Gemfile')

After finish all above steps, you just start Nginx and Unicorn
Start Nginx
$ service nginx start
Start Unicorn
unicorn_rails -c document_root/config/unicorn.rb -D

Setup Slim template
How to start?
Install Slim as a gem:
$ gem install slim

Include Slim in your Gemfile with gem 'slim' or require it with require 'slim'. That's it! Now, just use the .slim extension and you're good to go.

Thursday, September 19, 2013

How to install Sublime Text 2 on Ubuntu 12.04 (Unity)

Step 1

Download the tarfile that suits you best and extract it. Here’s the command to extract tar.bz2 files:
1.tar xf Sublime\ Text\ 2.0.1\ x64.tar.bz2
You’ll notice that I got the 64-bit version. The reason is that it’s lightning fast. So, go for that if you can!

Step 2

You’ll get a “Sublime Text 2″ folder after extraction. This folder contains all the files that Sublime Text will need. So we have to move that folder somewhere more appropriate. Like the “/opt/” folder :
1.sudo mv Sublime\ Text\ 2 /opt/

Step 3

At some point you’d want to be able to call Sublime Text from the Terminal by just typing “sublime”. To do that, we’ll just create a symbolic link in “/usr/bin” like thus:
1.sudo ln -s /opt/Sublime\ Text\ 2/sublime_text /usr/bin/sublime

Step 4

Now that our files are at the right place, we need to create a launcher in Unity. To do this, we’re going to create a .desktop file in “/usr/share/applications”:
1.sudo sublime /usr/share/applications/sublime.desktop
And paste the following content:
[Desktop Entry]
Name=Sublime Text 2
# Only KDE 4 seems to use GenericName, so we reuse the KDE strings.
# From Ubuntu's language-pack-kde-XX-base packages, version 9.04-20090413.
GenericName=Text Editor
Icon=/opt/Sublime Text 2/Icon/48x48/sublime_text.png
[NewWindow Shortcut Group]
Name=New Window
Exec=sublime -n
As you can see, these lines are quite straightforward. Go ahead and experiment a bit with them.

Step 5

Now you would probably want to open all text files with Sublime Text 2. The easiest way to do that is to open up the file associations list:
1.sudo sublime /usr/share/applications/defaults.list
And replace all occurrences of gedit.desktop with sublime.desktop.
Tada ! There you go. You now have Sublime Text 2 installed on Unity on Ubuntu 12.04, like a pro.