launching background process in capistrano task

Question

capistrano task

namespace :service do
  desc \"start daemontools (svscan/supervise/svscanboot)\"
  task :start, :roles => :app do
    sudo \"svscanboot&a         


        

Answer 1

I think nohup just launches the process in background, so you don't need to explicitly set the last &.

Did you try

run "nohup svscanboot >/tmp/svscanboot.log 2>&1"

(without the ending & to send it to the background).

That should work and remain running when your current capistrano session is closed.

Answer 2

Try this

run "nohup svscanboot >/tmp/svscanboot.log 2>&1 & sleep 5", pty: false

Answer 3

My simple solution would be make svscanboot.sh file at remote server with whatever code you want to run. In your case

svscanboot >/tmp/svscanboot.log 2>&1

In cap rake task add this

run "sh +x somefile.sh &"

this works well for me.

Answer 4

Try forking the process as explained here: Spawn a background process in Ruby

You should be able to do something like this:

job1 = fork do
  run "svscanboot"
end

Process.detach(job1)

As well, checkout this: Starting background tasks with Capistrano

Answer 5

I'd like to share my solution which also works when executing multiple commands. I tried many other variants found online, including the "sleep N" hack.

run("nohup sh -c 'cd #{release_path} && bundle exec rake task_namespace:task_name RAILS_ENV=production > ~/shared/log/<rakelog>.log &' > /dev/null 2>&1", :pty => true)