Question

I was wondering is there is a way to specify to the run command of Capistrano a way to operate in sequential mode rather than in parallel (typically via an environment variable)
If possible, I would like to avoid a conditional statement to switch between a run call and a find_servers_for_task(current_task).each do |hostname| ... end loop.

Any advice?

Answer 1

Ok, I found the correct syntax finally. You can limit the scope of a run command via the :hosts specifier (thanks Andriy Yanko). Example:

    before "mytask", 'set_roles'
    ########### mytask #####################
    desc "Example of a sequential run of capistrano"
    task :mytask, :roles => :dynhosts do
        find_servers_for_task(current_task).each do |hostname|
             info "=> run mytask on #{hostname}"
             run "whoami", :hosts => [ "#{hostname}" ]
        end         
    end