Created
June 19, 2012 17:52
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Heroku Rolling Restarts
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| class HerokuMaintenance | |
| def self.rolling_restarts | |
| puts "Processing Rolling Restarts" | |
| processes = time_hash[Time.now.hour] | |
| if processes | |
| puts "restarting: #{processes.inspect}" | |
| processes.each { |process| restart_process(process) if process} | |
| else | |
| puts "No restarts scheduled for hour: [#{Time.now.hour}]" | |
| end | |
| end | |
| def self.restart_process(name) | |
| puts "restarting process #{name}:" | |
| heroku_client.ps_restart(ENV['APP_NAME'], :ps => name) | |
| end | |
| def self.time_hash | |
| heroku_ps = heroku_client.ps(ENV['APP_NAME']) | |
| number_of_web_dynos = heroku_ps.select{|h| h['process'] =~ /^web\./}.count | |
| dyno_ids = [] | |
| # doing it twice to rotate twice a day | |
| dyno_ids << (1..number_of_web_dynos).to_a | |
| dyno_ids << (1..number_of_web_dynos).to_a | |
| dyno_ids.flatten! | |
| hours_to_run = [1,3,5,7,15,17,20,22,0] | |
| grouped_dynos = dyno_ids.in_groups_of(hours_to_run.length).transpose | |
| t_hash = {} | |
| hours_to_run.each_with_index do |h,i| | |
| t_hash[h] = numbers_to_process_array(grouped_dynos[i]) | |
| end | |
| t_hash | |
| end | |
| def self.numbers_to_process_array(array_of_nums) | |
| process_array = [] | |
| array_of_nums.each{|n| process_array << "web.#{n}"} | |
| process_array | |
| end | |
| def self.heroku_client | |
| Heroku::Client.new(ENV['APP_USERNAME'], ENV['APP_PASSWORD']) | |
| end | |
| end |
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