capistrano3 - Capistrano 3: Run task only on a single server from a pool of servers assigned a role -


i have 20 servers in "web" role. have task need perform on 1 of them change affects shared storage. current solution hack around (below). looking better way, don't have ton of ruby or cap experience.

task :checkout_project_properties     num_runs = 0     on roles(:web), in: :sequence         if num_runs > 0             abort('only running on 1 server.  exiting')         end         execute("checkout-project-properties #{uc_stage} #{repo} #{branch}")         num_runs += 1     end end

i assume referring production configuration, many web servers. in case, config/deploy/production.rb contains many lines this:

server 'web_1', roles: %w(web) server 'web_2', roles: %w(web) server 'web_3', roles: %w(web) ...

simply make 1 of these servers primary, looks like:

server 'web_1', roles: %w(web), primary: true server 'web_2', roles: %w(web) server 'web_3', roles: %w(web) ...

then change task looks this:

task :checkout_project_properties     on primary(:web)         execute("checkout-project-properties #{uc_stage} #{repo} #{branch}")     end end

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