Running a capistrano task in background

Question

I have a cap task that call multiple other long running cap tasks:

So lets say I have a task named A

From within this cap task I (depending on condition) call another cap task lets say B.

cap task B sequentially calls 4 more cap tasks c, D, E, & ,F

So be is something like this:

task :B do
    on roles(:all) do
        invoke 'tasks:C'
        invoke 'tasks:D'
        Rake::Task['db:E'].invoke("arg1", "arg2")
        Rake::Task['db:F'].invoke("arg1", "arg2")
    end
end

Each of C, D, E & F are long running and must run sequentially in same order as specified.

Basically tasks C to F are db & assets zipping and uploading tasks which might take long time, so they must not hinder the cap deployment process and should run independently in background.

So I need a way to call task B from task A so that it runs in async mode, and rest of cap tasks during deployment keep running.

To clarify: Are tasks C-F supposed to finish before the completion of the Capistrano run, or are they long running background processes/daemons? — will_in_wi, Jun 02 '16 at 11:39
So C-F will eventually finish, but a deployment can be considered done before they do? — will_in_wi, Jun 02 '16 at 12:13
Yes, before deployment, I stop the servers, initiate db and asset backups and upload in background, and complete deployment and restart server. — xor, Jun 02 '16 at 12:15

score 2 · Accepted Answer · edited May 23 '17 at 12:08

2

I'd suggest making task B an actual Rake task, and then having Capistrano call and immediately background it, e.g. https://stackoverflow.com/a/5829142/3042016

edited May 23 '17 at 12:08

Community

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answered Jun 02 '16 at 12:21

will_in_wi

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Thanks, I made a ruby script for all four tasks combined to one, uploaded it to the server and then ran it in the background using `nohup`. Worked like a charm – xor Jun 28 '16 at 19:39

Running a capistrano task in background

1 Answers1