one application, multiple times on the target box in different folders

[Andres]

Hi,

Quick question,

With the basic documentation, it easy to understand how to deploy one
app to different boxes by passing several servers to the role :app,
variable.

But, what if I'd like to deploy the same application several times in
the same box,
something as

set :deploy_to, "/home/rails/install_1/#{application}"
set :deploy_to, "/home/rails/install_2/#{application}"
set :deploy_to, "/home/rails/install_3/#{application}"

But all in the same machine,

So, in this case, what's the approach to deploy my app several times
in the same box?

Thank you,

Andres

[Jamis Buck]

I'd do something like the multistage stuff:

set(:deploy_to) { abort "you need to call install_1, install_2, or
install_3 first" }

task :install_1 do
set :deploy_to, "/home/rails/install_1/#{application}"
end

task :install_2 do
set :deploy_to, "/home/rails/install_2/#{application}"
end

task :install_3 do
set :deploy_to, "/home/rails/install_3/#{application}"
end

Then, I'd deploy three times:

cap install_1 deploy
cap install_2 deploy
cap install_3 deploy

Which, of course, could be wrapped into a rake task for ease of
execution if you're always executing all three.

- Jamis

[andres]

On Mon, 2008-07-14 at 15:56 -0600, Jamis Buck wrote:

I'd do something like the multistage stuff:

beautiful,
many thanks,

   set(:deploy_to) { abort "you need to call install_1, install_2, or  
install_3 first" }

   task :install_1 do
     set :deploy_to, "/home/rails/install_1/#{application}"
   end

   task :install_2 do
     set :deploy_to, "/home/rails/install_2/#{application}"
   end

   task :install_3 do
     set :deploy_to, "/home/rails/install_3/#{application}"
   end

Then, I'd deploy three times:

   cap install_1 deploy
   cap install_2 deploy
   cap install_3 deploy

Which, of course, could be wrapped into a rake task for ease of  
execution if you're always executing all three.

- Jamis

On Jul 14, 2008, at 3:35 PM, Andres wrote:

>
> Hi,
>
> Quick question,
>
> With the basic documentation, it easy to understand how to deploy one
> app to different boxes by passing several servers to the role :app,
> variable.
>
> But, what if I'd like to deploy the same application several times in
> the same box,
> something as
>
> set :deploy_to, "/home/rails/install_1/#{application}"
> set :deploy_to, "/home/rails/install_2/#{application}"
> set :deploy_to, "/home/rails/install_3/#{application}"
>
> But all in the same machine,
>
> So, in this case, what's the approach to deploy my app several times
> in the same box?
>
> Thank you,
>
> Andres
>
> >


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-- Andres Paglayan CTO, StoneSoup LLC Ph: 505 629-4344 Mb: 505 690-2871 FWD: 65-5587 Testi. Codi. Vinci.

[shaan]

Jamis,
I tried your suggestion and here is what I did:

before 'deploy_task_that_fails', 'print_variables'

task :install_1 do
set :deploy_to, "/home/rails/install_1/#{application}"
end

task :deploy_task_that_fails do
fail "abort here."
end

Where 'print_variable' is something like:

task :print_variables, :roles => :app do
%w(application deploy_to).each do |k|
puts "#{k} => #{fetch(k.to_sym)}"
end
(variables.keys.select { |k| /stage/ =~ k.to_s }).each do |k|
puts "#{k} => #{fetch(k.to_sym)}"
end
(variables.keys.select { |k| /path/ =~ k.to_s }).each do |k|
puts "#{k} => #{fetch(k.to_sym)}"
end
end

When I try 'cap install_1 fail-here' I get following

$ cap install_1 deploy_task_that_fails
* executing `install_1'
* executing `deploy_task_that_fails'
triggering before callbacks for `deploy_task_that_fails'
* executing `print_variables'
application => PlantCollections_qa
deploy_to => /home/rails/install_1/PlantCollections_qa
stage => qa
releases_path => /home/rails/install_1/PlantCollections_qa/releases
shared_path => /home/rails/install_1/PlantCollections_qa/shared
current_path => /u/apps/PlantCollections_qa/current
release_path => /home/rails/install_1/PlantCollections_qa/releases/
20080717181519

Note that, current_path is not what you expect it to be. Won't this
cause problems?

I needed something like:

set :rails_env, 'qa'
set :application, "PlantCollections_#{rails_env}"

Since, :rails_env has to be different for different stage (makes most
sense), I couldn't get :application based on :rails_env (because of
some lazy definition issue with mulstage).

So, here is what I ended up doing:

I got rid of multistage and included following _at_the_top of my
deploy.rb:

require 'palmtree/recipes/mongrel_cluster'
set :stage, "qa" unless variables[:stage]
location = fetch(:stage_dir, "config/deploy")
load "#{location}/#{stage}"

This would immediately load the stage specific deploy/<stage>.rb and I
could set :rails_env and :application in my <stage>.rb file.

This does change how different can be invoked. So, I can no longer do
"cap <stage> <deploy_task>".
Instead, I have to to "cap -S <stage> <deploy_task>".

I am happy with what I've got, however, I am not sure if I am settiny
myself up for a big trouble later (all because I don't understand the
lazy variable definition)

> --
> Andres Paglayan
> CTO, StoneSoup LLC
> Ph: 505 629-4344
> Mb: 505 690-2871
> FWD: 65-5587
> Testi. Codi. Vinci.
>

> smime.p7s
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