GhostScript upgrade for Amazon Ec2-linx

1) SSH into instance

2) Now as root user

  • sudo su
  • sudo make install
  • make soinstall && install -v -m644 base/*.h /usr/include/ghostscript && ln -v -s ghostscript /usr/include/ps
  • ln -sfv ../ghostscript/9.14/doc /usr/share/doc/ghostscript-9.14
  • wget http://downloads.sourceforge.net/gs-fonts/ghostscript-fonts-std-8.11.tar.gz
  • tar -xvzf ghostscript-fonts-std-8.11.tar.gz
  • tar -xvf ghostscript-fonts-std-8.11.tar.gz -C /usr/share/ghostscript –no-same-owner && fc-cache -v /usr/share/ghostscript/fonts/

3) Now check ghostscript version

  • Ghostscript
  • gs –v

Please let me know if anyone need more information on this.

Manage multiple SSH keys

SSH keys are a very efficient way to make secure connections over the internet, for a large variety of things.

Many things use SSH keys regularly, for example using Git on GitHub requires you to register a key to use when accessing repositories.
Most of the time, however, their help guides only explain how to create a single key and use it with their service. If you use multiple services that use SSH, you could use the same key for all of them but that would be less secure and would mean having to change your key on each one if you have to change it at any point.

The obvious thing to do is to create multiple keys. This is a quick little tutorial on how to create and manage multiple SSH keys using a Linux terminal. If anyone knows the Windows equivalent, please let me know and I’ll add it to this post.

Creating Keys

Let’s start with the basics, the most important thing to be able to do here is to create a key.

Simply open up a new terminal and do the following:
cd ~/.ssh
If you get a response saying the directory does not exist run mkdir ~/.ssh and then repeat.
ssh-keygen
You will be prompted for an output file, just leave it blank and press enter.
You will now be prompted for a passphrase, and then to repeat the passphrase. Do not forget this passphrase, it’s the “lock” for the key.
Once the key has been created you need to add it to the key manager, using ssh-add id_rsa and enter the passphrase you just used.

Script started on Tue 24 Apr 2012 14:15:45 BST
joe@beast:~$ cd ~/.ssh
joe@beast:~/.ssh$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/joe/.ssh/id_rsa): [Press Enter] 
Enter passphrase (empty for no passphrase): [Enter A Passphrase] 
Enter same passphrase again: [Repeat Passphrase] 
Your identification has been saved in /home/joe/.ssh/id_rsa.
Your public key has been saved in /home/joe/.ssh/id_rsa.pub.
The key fingerprint is:
c0:73:11:d7:6e:bc:09:0e:89:62:30:38:e8:e3:fc:17 joe@beast
The key's randomart image is:
+--[ RSA 2048]----+
|..      o...     |
|+ o  .   o  .    |
|.. o  +... o     |
| o  o .+o . +    |
|o .. .  So o o   |
| o   E    . o    |
|  .   .          |
|   . .           |
|    .            |
+-----------------+
Script done on Tue 24 Apr 2012 14:16:13 BST

joe@beast:~/.ssh$ ssh-add id_rsa
Enter passphrase for id_rsa: 
Identity added: id_rsa (id_rsa)
[joe@goblin ~]$ cd .ssh
[joe@goblin .ssh]$ ls -l
total 16
-rw-r--r--. 1 joe joe  407 May  4 22:07 config
drwx------. 2 joe joe 4096 Apr 24 13:27 fedoraproject
drwx------. 2 joe joe 4096 Apr 24 13:20 git
-rw-r--r--. 1 joe joe 2061 May  4 22:06 known_hosts
[joe@goblin .ssh]$ cd git
[joe@goblin git]$ ls -l
total 8
-rw-------. 1 joe joe 1766 Jan  5  2012 id_rsa
-rw-r--r--. 1 joe joe  403 Jan  5  2012 id_rsa.pub
[joe@goblin git]$

So in each of the subfolders you will have id_rsa and id_rsa.pub.

Pointing to the Key

The only problem now, is that when ssh searches for a key, it won’t be able to find the one it’s looking for. You need to correctly edit your config file that should be located in your ~/.ssh/ folder. If it isn’t already there, just create a new file.

Mine looks like the following:

Host github.com
	User git
	Hostname github.com
	PreferredAuthentications publickey
	IdentityFile ~/.ssh/git/id_rsa
Host fedoraproject.org
	Hostname fedoraproject.org
	PreferredAuthentications publickey
	IdentityFile ~/.ssh/fedoraproject/id_rsa
Host fedorapeople.org
	Hostname fedorapeople.org
	PreferredAuthentications publickey
	IdentityFile ~/.ssh/fedoraproject/id_rsa

It’s fairly self-explanatory what each part of the file is, you could even just use mine as a template.

Install and configure LibreOffice-4 Amazon Ec2 Instance (Amazon Linux)

  1. Login into Ec2 instance via SSH.
  2. Upgrade Amazon Linux.a) > sudo yum updateb) Reboot instance
  3. Login into Ec2 instance via SSH.
  4. Download LibreOffice (Select package depends on OS Architecture)> sudo wget LibreOffice
  5. Extract source from tar file.> sudo tar -xvzf LibreOffice_4.0.4_Linux_x86-64_rpm.tar.gz
  6. Enter into extracted directory then RPMS folder> cd LibreOffice_4.0.4.2_Linux_x86-64_rpm> cd RPMS
  7. Now need to install all rpms except one, you can remove that.> rm -rf libobasis4.0-gnome-integration-4.0.4.2-2.x86_64.rpm
  8. Now you can able to convert document.> /opt/libreoffice4.0/program/soffice.bin –headless –convert-to pdf test.rtf
  9. If you are getting any dependencies while document conversation please fulfill dependency.
  1. All packages almost available for all Linux flavors from two sources.

          – http://pkgs.org

          – http://rpm.pbone.net

11) In my case there was dependencies for dbus-glib-0 while document conversation.

> sudo wget http://mirror.centos.org/centos/6/updates/x86_64/Packages/dbus-glib-0.86-6.el6.x86_64.rpm

OR

> sudo rpm -Uvh http://mirror.centos.org/centos/6/updates/x86_64/Packages/dbus-glib-0.86-6.el6.x86_64.rpm

Able to perform document convent process headless after successful installation of LibreOffice.

Feel free to contact if anyone need help !

Setup multistage deployment with Capistrano Passenger and SVN with Staging Development Production environments

When application needs to be set on different environment like staging and development question comes  how to manage cap deploy ?

Here are easy steps which will guide to setup and manage with SVN and Capistrano

Setup multistage deployment with Capistrano
1)    Install capistrano and capistrano multistage
2)    Capify your project
3)    Prepare the deploy / directory
4)    Create the deployment recipes

For my project i have created development and production environment. Name your stages whatever you want. but, never name one of your stages stage — it’s a reserved word. We Can name it “staging”.

1) Install capistrano and capistrano multistage

gem install capistrano –no-ri –no-rdoc
gem install capistrano-ext –no-ri –no-rdoc

2) Capify your project

capify you project with following command in project root folder

capify .

3) Prepare the deploy / directory

mkdir config/deploy
touch config/deploy/development.rb
touch config/deploy/production.rb

4) Create the deployment recipes

require ‘capistrano/ext/multistage’

set :stages, %w(development production)
set :default_stage, “development”
set :application, “application”

set :user, “username”
set :password, “password”

set :repository, “https://domain/svn/project/trunk”
set :scm, :subversion
set :scm_username, “repository_username”
set :scm_username, “repository_password”
set :deploy_via, :export

# deploy using “ssh-add”, then “cap deploy”
ssh_options[:forward_agent] = true
set :ssh_options, {:forward_agent => true}
set :use_sudo, false

# If you are using Passenger mod_rails uncomment this:
namespace :deploy do
task :start do ; end
task :stop do ; end

task :install_configs
#perform specify operations like set path or other stuff here
end

task :restart, :roles => :app, :except => { :no_release => true } do
run “#{try_sudo} touch #{File.join(current_path,’tmp’,’restart.txt’)}”
end
end

after(‘deploy:update_code’, “deploy:cleanup”, ‘deploy:install_configs’)

 

Now it’s turn to set both files which we have created in config/deploy 1) development.rb  2) production.rb

Set your development.rb

server “development.domain.com”, :app, :web, :db, :primary => true
set :deploy_to, “/var/www/development.domain.com” #path where you want to deploy application on server
set :db_config, “database-development.yml”

namespace :perform do
task :install_configs
#perform specify operations like set path or other stuff here
end
end

after(“deploy”, “perform:install_configs”)

Set your production.rb

server “production.domain.com”, :app, :web, :db, :primary => true
set :deploy_to, “/var/www/production.domain.com” #path where you want to deploy application on server
set :db_config, “database-production.yml”

namespace :perform do
task :install_configs
#perform specify operations like set path or other stuff here
end
end

after(“deploy”, “perform:install_configs”)

 

Great, you are ready to deploy with both environments

When you deploy recipe with cap deploy it will start deploying default environment whatever is set, if you want to deploy specific for environment please run command cap “environment” deploy in our case cap production deploy .

All set with multistage Capistrano deployment with minimal configuration.Lot more for rails 3 and RVM configuration.

Experience with RhoMobile Framework (Cross Platform mobile application development using Ruby !)

Since last three months i been working with RhoMobile (Cross platform mobile development using Ruby).

As i came across it’s totally new domain for me, you need to understanding mobile device environment and behavior .

Major part while developing application with RhoMobile.

1) Ruby

2) Services for different functionality

3) Jqmobile / Jquery

4) Rhodes SDK

5) Cross platform SDKs (iPhone, Android, BB)

More details and installing guide for different platform available http://docs.rhomobile.com/

Install Rabbitvcs in ubuntu

Manage SVN and GIT with GUI interface

Open Terminal

Step 1

sudo add-apt-repository ppa:rabbitvcs/ppa

Step 2

sudo apt-get update

Step 3

sudo apt-get install rabbitvcs-core

Step 4

Install nautilus,thunar,gedit

sudo apt-get install rabbitvcs-nautilus rabbitvcs-thunar rabbitvcs-gedit rabbitvcs-cli

Enjoy !

Configure Mongodb with mViewer GUI interface in Ubuntu

Now a days mongodb is largely used, how to configure in ubuntu.

Follow steps :

1) add this line to your /etc/apt/sources.list
deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen

2) sudo apt-key adv –keyserver keyserver.ubuntu.com –recv 7F0CEB10

3) sudo apt-get update

4) sudo apt-get install mongodb-10gen

You are ready with mongodb , to check status service mongodb status.

Now install mViewer the Mongodb GUI interface.

1) Download mViewer from

https://github.com/Imaginea/mViewer

2) Now go to scripts folder and run start_mviewer.sh

3) Visit your localhost on 8080 port with no username and password if you have not set any(http://127.0.0.1:8080).

Now you are done with mongodb GUI interface.

Happy coding !