Tag Archives: ubuntu

Simple Staging/Test Environment with Heroku – Ruby on Rails

Hey everyone,

This is just a quick guide on how to create a test/staging environment with Heroku.

-- Create staging environment
heroku create --remote staging

-- Push to staging app
heroku push staging master

-- Run rake db:migrate on staging app
heroku run rake db:migrate --remote staging

-- Add pgbackups add ons
heroku addons:add pgbackups --remote staging
heroku addons:add pgbackups --remote heroku

-- Create backup of production data
heroku pgbackups:capture --remote heroku

-- Copy to staging environemnt
heroku pgbackups:restore DATABASE `heroku pgbackups:url --remote heroku` --remote staging

-- Create a new config file called staging.rb (/config/environments/staging.rb)

-- Add environment variables
heroku config:add RACK_EVN=staging RAILS_ENV=staging --remote staging

-- Ready to go !

For those of you using git branches etc, the following may come in handy as well:

-- Create local development branch
git branch development

-- Switch to dev branch
git checkout development

-- Make your changes and commit them
git init
git add .
git commit -m "My changes"

-- Push to staging environment (local development branch to staging environment master branch)
git push staging development:master

If you run into any trouble, I found the following links pretty helpful:

http://stackoverflow.com/a/6931462/522859
https://devcenter.heroku.com/articles/pgbackups#transfer
https://devcenter.heroku.com/articles/multiple-environments

Let me know if you’ve got anything to add.

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Assets:Precompile (Rake Aborted) – Heroku

Hey everyone,

I ran into the following error over the weekend while trying to push to heroku:

Running: rake assets:precompile
rake aborted!
could not connect to server: Connection refused
Is the server running on host “127.0.0.1” and accepting
TCP/IP connections on port 5432?

This stackoverflow post helped to solve the issue. All you need to do is add the following line to your application.rb file:

#Applicication.rb
config.assets.initialize_on_precompile = false

Let me know if you have any problems.

Installing SQL Developer on Ubuntu – make-sqldeveloper-package chmod: missing operand after `755′

Hey everyone,

I was following a guide while trying to install SQL Developer on Ubuntu, however I ran into the following error:

make-sqldeveloper-package chmod: missing operand after `755′

 

To fix it, simply change line number #381 in ‘/usr/bin /make-sqldeveloper-package’ as follows:

Original

${FIND} "${OPTDIR}" ! ( -type d -o -name "*.jar" ) |${XARGS} ${XARGS_OPTS} ${FILE} ${FILE_OPTS} |${GREP} ${GREP_OPTS} "shell script text executable" |${CUT} ${CUT_OPTS_FUNC_CLEAN} |${XARGS} ${XARGS_OPTS} ${CHMOD} ${CHMOD_OPTS}

Modified

${FIND} "${OPTDIR}" ! ( -type d -o -name "*.jar" ) |${XARGS} ${XARGS_OPTS} ${FILE} ${FILE_OPTS} |${GREP} ${GREP_OPTS} "shell script" | ${GREP} ${GREP_OPTS} "text executable" |${CUT} ${CUT_OPTS_FUNC_CLEAN} |${XARGS} ${XARGS_OPTS} ${CHMOD} ${CHMOD_OPTS}

Thanks to this blog post for the solution, just note that it is Polish.

Let me know if you have any issues!

WARN Could not determine content-length of response body – Ruby on Rails

Hey everyone

I was going through my development logs today and noticed that the following line was appearing everywhere:

WARN Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true

While nothing appeared to be wrong, it made the logs a lot harder to read. A stackoverflow post indicates that this is a webrick issue that can be avoided by switching to thin. This is also the recommended option for heroku. In order to use thin, you simply need to add it to your Gemfile:

#Gemfile

#Added gems
gem 'therubyracer' #JavaScript
gem 'thin' #Instead of webrick

Run bundle install

chris@chris-VirtualBox:~/calendar$ bundle install
Fetching gem metadata from https://rubygems.org/...........
Fetching gem metadata from https://rubygems.org/..
Using rake (10.0.2) 
Using i18n (0.6.1) 
Using multi_json (1.4.0) 
Using activesupport (3.2.9) 
Using builder (3.0.4) 
Using activemodel (3.2.9) 
Using erubis (2.7.0) 
Using journey (1.0.4) 
Using rack (1.4.1) 
Using rack-cache (1.2) 
Using rack-test (0.6.2) 
Using hike (1.2.1) 
Using tilt (1.3.3) 
Using sprockets (2.2.2) 
Using actionpack (3.2.9) 
Using mime-types (1.19) 
Using polyglot (0.3.3) 
Using treetop (1.4.12) 
Using mail (2.4.4) 
Using actionmailer (3.2.9) 
Using arel (3.0.2) 
Using tzinfo (0.3.35) 
Using activerecord (3.2.9) 
Using activeresource (3.2.9) 
Using bcrypt-ruby (3.0.1) 
Using bundler (1.2.3) 
Using coffee-script-source (1.4.0) 
Using execjs (1.4.0) 
Using coffee-script (2.2.0) 
Using rack-ssl (1.3.2) 
Using json (1.7.5) 
Using rdoc (3.12) 
Using thor (0.16.0) 
Using railties (3.2.9) 
Using coffee-rails (3.2.2) 
Installing daemons (1.1.9) 
Installing eventmachine (1.0.0) with native extensions 
Using jquery-rails (2.1.4) 
Using libv8 (3.3.10.4) 
Using pg (0.14.1) 
Using rails (3.2.9) 
Using sass (3.2.3) 
Using sass-rails (3.2.5) 
Using therubyracer (0.10.2) 
Installing thin (1.5.0) with native extensions 
Using uglifier (1.3.0) 
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

And finally start thin:

chris@chris-VirtualBox:~/calendar$ rails s thin
=> Booting Thin
=> Rails 3.2.9 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
>> Thin web server (v1.5.0 codename Knife)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:3000, CTRL+C to stop

If you’d prefer to keep using Webrick, the following patch is said to resolve the issue:
https://bugs.ruby-lang.org/attachments/2300/204_304_keep_alive.patch

Link

Hey everyone,

I’ve just done a fresh install of RVM using the guide below. There were a few dependencies missing, but other than that it all went pretty smoothly.

Link: http://stjhimy.com/posts/10-five-quick-steps-to-set-up-rvm-with-rails-2-and-rails3

Next time I do an install I’ll try to document the whole thing, but for now that link is probably one of the better/simpler guides I’ve come across. If you have any problems please leave a comment below and I’ll try to get back to you.

UPDATE:

Just another guide I’ve come across that seems to work well, this one is a complete “start to finish” one:
http://rails.vandenabeele.com/blog/2011/11/26/installing-ruby-and-rails-with-rvm-on-ubuntu-11-dot-10/

Heroku Timezones – Ruby on Rails

Hey everyone,

Just a quick post on how to adjust the timezone on Heroku, comes in handy when using the log files.

#Console
$ heroku config:add TZ=Australia/Brisbane

There is a fairly detailed StackOverflow post at the following link if anyone is interested in more info:
http://stackoverflow.com/questions/2719330/why-does-heroku-log-using-the-server-time-rather-than-the-rails-time-zone

The language options can also be found on the following wikipedia page:
http://en.wikipedia.org/wiki/List_of_tz_database_time_zones

Cannot Generate Tempfile – Ruby on Rails

Ran into the following problem, still not too sure what caused it but this seems to have fixed it:

Error

cannot generate tempfile `/home/chris/cartsite/tmp/cache/assets/sprockets%2Fd585a06e2ee6203ccb04c8b84150d14d20120804-8682-7q77nb-9'

Just run the following:

$ rake tmp:clear

Let me know if you come across the cause, I’d be interested to know.