Category Archives: linux

Using Postfix to send out emails from development environment in Rails

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Problem

You want to be able to send emails from your development enironment using Postfix in your (K)Ubuntu pc.

Solution

First you would need to install postfix:

sudo apt-get install postfix

and then you would need to change an option in postfix to not use tls, so change /etc/postfix/main.cf:

sudo vi /etc/postfix/main.cf

and change the smtpd_use_tls from yes to no:

smtpd_use_tls=no

restart your postfix server:

sudo /usr/sbin/postfix reload

and then setup your config/development.rb as follows:

config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  address:                 "127.0.0.1",
  port:                    25,
  enable_starttls_auto:    false
}

Command line mail message with postfix in (K)ubuntu

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Problem

You have installed postfix in your local development machine (sudo apt-get install postfix), and you want to test sending emails from the command line using mail email_address@someone.com

 

Solution

You would first need to install the mailutils package:

sudo apt-get install mailutils

then you can send an email by:

mail email_name@example.com
CC: (leave blank)
Subject: Test subject
Main message body

and you can send it by pressing Ctrl+D

Redirecting postfix email to a different email account

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Problem

You have setup your Rails app to send out emails using postfix, but you also want to redirect the incoming emais to a different account.

Solution

Edit the postfix configuration file vi /etc/postfix/main.cf and add the following two lines at the bottom:

virtual_alias_domains = outgoing_domain.com
virtual_alias_maps = hash:/etc/postfix/virtual

And then add the redirections to the virtual file with vi /etc/postfix/virtual:

outgoing_email@outgoing_domain.com           other_account@other_domain.com
@outgoing_domain.com                         other_account@other_domain.com

Then run the following two commands to restart postfix:

postmap /etc/postfix/virtual
postfix reload

* Based on the post here

Creating a Vagrant Box with Debian Lenny 32, rvm and Ruby 1.9.3

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As an addition to the excellent beta book ‘Deploying Rails’, as I had problems using the suggested lucid64 image, I’ve tried to install a debian lenny 32 image with rvm and Ruby 1.9.3.

The steps needed are listed below

 

  1. Download the lenny package: 
    localhost$ vagrant box add debian-lenny-32 https://s3-eu-west-1.amazonaws.com/glassesdirect-boxen/debian/debian_lenny_32.box
  2. Make a new directory for the virtual box: 
    localhost$ mkdir -p ~/deployingrails/lenny32
  3. change into created directory and create the Vagrant file: 
    localhost$ cd ~/deployingrails/lenny32
vagrant init
  4. change the Vagrant file to use the virtual box we have downloaded: 
    Vagrant::Config.run do |config|
  config.vm.box = "lenny32"
end
  5. Start the VM: 
    localhost$ vagrant up
  6. If there is a warning about the Guest additions here install the latest guest additions by following the description here, but only use the update and upgrade steps as: 
    localhost$ vagrant ssh
vagrant$ sudo apt-get update
vagrant$ sudo apt-get upgrade
  7. After finishing the upgrade logout (exit) from the VM and issue the command to restart the VM: 
    localhost$ vagrant reload
  8. login to the VM again: 
    localhost$ vagrant ssh
  9. Install curl to be able to download the installation script for:
    vagrant$ sudo apt-get install curl
  10. Download and install rvm by using the script described here http://beginrescueend.com/rvm/install/ : 
    vagrant$ bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)
  11. Add the loading of the RVM function into .bashrc, by running the following in the command prompt: 
    vagrant$ echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" # Load RVM function' >> ~/.bashrc
  12. Reload the bashrc file: 
    vagrant$ source ~/.bashrc
  13. Make sure that the rvm is loaded as function: 
    vagrant$ type rvm | head -1
rvm is a function
  14. Run the rvm requirement to see the needed libraries and then run the suggested ones (except libreadline6 and libreadline6-dev that are not there in debian): 
    vagrant$ sudo apt-get install build-essential openssl curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison
  15. Install Ruby 1.9.3 : 
    vagrant$ rvm install ruby-1.9.3
  16. Use the ruby 1.9.3 as default: 
    vagrant$ rvm use 1.9.3 --default
  17. Finally create a new VM package to use in future: 
    localhost$ vagrant package --output lenny32-rvm-ruby193
  18. And add it our box list:

    localhost$ vagrant box add lenny32-rvm-ruby193 lenny32-rvm-ruby193
localhost$ vagrant box list

Could not open library ‘libgtkmm-2.4.so’: libgtkmm-2.4.so: cannot open shared object file: No such file or directory.

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Problem

If you have setup guard with your Rails project and you are trying to run it in an (K)Ubuntu installation you get the following message:

Could not open library 'libgtkmm-2.4.so': libgtkmm-2.4.so: cannot open shared object file: No such file or directory.

Solution

Install the missing library with the following:

sudo apt-get install libgtkmm-2.4

multiple user installation of rvm in Debian

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Problem
You would like to install rvm as a multiple user installation in Debian.

Solution
You would need to do the following:

as root

  • bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)

for each individual user you want to use rvm

  • in the user’s .bashrc or .bashrc_profile add the following at the bottom:
    [[ -s "/usr/local/rvm/scripts/rvm" ]] && source "/usr/local/rvm/scripts/rvm" # This loads RVM into a shell session.
  • reload the .bashrc or .bashrc_profile by:
    source .bashrc|.bashrc_profile

and you should be able to do rvm -v.

Error while loading shared libraries – Mandriva

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Problem
After installing a package and trying to run it in Mandriva 2010 64, you get errors about missing libraries, like:

error while loading shared libraries: libasound.so.2: cannot open shared object file: No such file or directory

Solution
Use the urpmf command to find the packages that contain the missing libraries like :

urpmf libasound.so.2

and then when you get something like the following:

lib64alsa2:/usr/lib64/libasound.so.2
lib64alsa2:/usr/lib64/libasound.so.2.0.0
lib64alsa2:/usr/lib64/libasound.so.2
lib64alsa2:/usr/lib64/libasound.so.2.0.0
libalsa2:/usr/lib/libasound.so.2
libalsa2:/usr/lib/libasound.so.2.0.0
libalsa2:/usr/lib/libasound.so.2
libalsa2:/usr/lib/libasound.so.2.0.0

install the missing packages with:

sudo urpmi lib64alsa2
or/and
sudo urpmi libalsa2