Delayed job wont start using Capistrano

问题:

I cannot start delayed job process using a capistrano recipe. Here's the error I am getting.

/usr/local/lib/ruby/gems/1.9.1/gems/delayed_job-2.1.1/lib/delayed/command.rb:62:in `mkdir': File exists - /my_app/server/releases/20101120001612/tmp/pids (Errno::EEXIST)

Here's the capistrano code (NOTE-: I have tried both start/restart commands)

after "deploy:restart", "delayed_job:start"
task :start, :roles => :app do          
  run "cd #{current_path}; RAILS_ENV=#{rails_env} script/delayed_job -n 2 start"
end

More detail errors from deployment logs -

executing command
 [err :: my_server] /usr/local/lib/ruby/gems/1.9.1/gems/delayed_job-2.1.1/lib/delayed/command.rb:62:in `mkdir': File exists - /my_app/server/releases/20101120001612/tmp/pids (Errno::EEXIST)
 [err :: my_server] from /usr/local/lib/ruby/gems/1.9.1/gems/delayed_job-2.1.1/lib/delayed/command.rb:62:in `daemonize'
 [err :: my_server] from script/delayed_job:5:in `<main>'
    command finished
failed: "sh -c 'cd /my_app/server/current; RAILS_ENV=production script/delayed_job -n 3 restart'" on myserevr

This is a Rails 3 app (v3.0.3)

回答1:

Seeing the same problem.

It turns out I was missing the ~/apps/application_name/shared/pids directory.

Finally creating it made this problem go away.

No need to set up custom dj_pids directory.

回答2:

I also got this error and found a couple of issues:

• Ensure you have a shared/pids folder.
• Ensure you have the correct hooks setup

Your deploy.rb script should contain:

require "delayed/recipes"

after "deploy:stop", "delayed_job:stop"
after "deploy:start", "delayed_job:start"
after "deploy:restart", "delayed_job:restart"

I'd copied the hooks from an old post and they appear to be incorrect now. These are from the actual delayed_job recipe file comments.

I believe cap deploy:setup should create the pids folder but I set things up a different way and it was not created. app/current/tmp/pids links to app/shared/pids and this was causing the false directory exists error.

回答3:

This is how I fixed the issue, I passed an explicit pids dir parameter using "--pid-dir". Not sure if this is perfect, but it worked.

task :restart, :roles => :app do
  run "cd #{current_path}; RAILS_ENV=#{rails_env} script/delayed_job -n #{dj_proc_count} --pid-dir=#{app_root}/shared/dj_pids restart"
end

回答4:

Add the creation of this directory before

after "deploy:restart", "delayed_job:start"
task :start, :roles => :app do  
  run "mkdir #{current_path}/tmp/pids"
  run "cd #{current_path}; RAILS_ENV=#{rails_env} script/delayed_job -n 2 start"
end

回答5:

I had the same issue. Turned out that there was an existing

application_name/shared/pids/delayed_job.main.pid

file, which had incorrect owner permissions, which was causing the deployment to fail. Fixing this file's permissions solved the issue for me.

回答6:

Since the creation of the directories is cheap and fast, use the following callback:

before 'deploy', 'deploy:setup'

This will ensure that structure is always there before each deploy.