Class: EbDeployer::DeploymentStrategy::BlueGreen

Inherits:
Object
  • Object
show all
Defined in:
lib/eb_deployer/deployment_strategy/blue_green.rb

Instance Method Summary collapse

Constructor Details

#initialize(component) ⇒ BlueGreen

Returns a new instance of BlueGreen.



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# File 'lib/eb_deployer/deployment_strategy/blue_green.rb', line 4

def initialize(component)
  @component = component
end

Instance Method Details

#deploy(version_label, env_settings, inactive_settings = []) ⇒ Object 



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# File 'lib/eb_deployer/deployment_strategy/blue_green.rb', line 17

def deploy(version_label, env_settings, inactive_settings=[])

  if !ebenvs.any?(&method(:active_ebenv?))
    ebenv('a', @component.cname_prefix).
      deploy(version_label, env_settings)
    return
  end

  active_ebenv = ebenvs.detect(&method(:active_ebenv?))
  inactive_ebenv = ebenvs.reject(&method(:active_ebenv?)).first

  inactive_ebenv.deploy(version_label, env_settings)
  active_ebenv.swap_cname_with(inactive_ebenv)

  blue_green_terminate_inactive       = @create_opts[:blue_green_terminate_inactive]
  blue_green_terminate_inactive_wait  = @create_opts[:blue_green_terminate_inactive_wait]
  blue_green_terminate_inactive_sleep = @create_opts[:blue_green_terminate_inactive_sleep]

  if blue_green_terminate_inactive
    active_ebenv.log("Waiting #{blue_green_terminate_inactive_wait}s before terminating environment...")

    # Loop until timeout reached or environment becomes Red
    count = 0
    loop do
      break if count >= blue_green_terminate_inactive_wait or inactive_ebenv.health_state != 'Green'
      sleep blue_green_terminate_inactive_sleep
      count += blue_green_terminate_inactive_sleep
    end

    if inactive_ebenv.health_state == 'Green'
      active_ebenv.log("Active environment healthy, terminating inactive (black) environment")
      active_ebenv.terminate
    else
      active_ebenv.log("Active environment changed state to unhealthy. Existing (black) environment will not be terminated")
    end

  end

  unless inactive_settings.empty? || blue_green_terminate_inactive
    active_ebenv.log("applying inactive settings...")
    active_ebenv.apply_settings(inactive_settings)
  end
end

#test_compatibility(env_create_options) ⇒ Object 



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# File 'lib/eb_deployer/deployment_strategy/blue_green.rb', line 8

def test_compatibility(env_create_options)
  @create_opts = env_create_options
  tier = env_create_options[:tier]

  if tier && tier.downcase == 'worker'
    raise "Blue green deployment is not supported for Worker tier"
  end
end