class Zeployment::Aws

Public Class Methods

deploy(name_of_load_balancer, login_command_without_ip, commands_to_run) click to toggle source
# File lib/zeployment.rb, line 74
def self.deploy (name_of_load_balancer, login_command_without_ip, commands_to_run)
  instances_details = get_load_balancer_instances_description(name_of_load_balancer)
  instances_details["InstanceStates"].each do |instance|
    instance_id = instance["InstanceId"]
    instance_ip = get_ip_address_of_ec2_from_id(instance_id)
    puts instance_ip
    deregister_instance_from_load_balancer(name_of_load_balancer, instance_id)
    login_and_run_commands("#{login_command_without_ip}@#{instance_ip}", commands_to_run)
    register_instance_with_load_balancer(name_of_load_balancer, instance_id)
    wait_till_the_instance_in_service(name_of_load_balancer, instance_id)
    puts ">>>>>>> Instance is in Service now <<<<<<<<<<<<<"
  end
end
deregister_instance_from_load_balancer(name_of_load_balancer, instance_id) click to toggle source
# File lib/zeployment.rb, line 55
def self.deregister_instance_from_load_balancer (name_of_load_balancer, instance_id)
  JSON.parse(`aws elb deregister-instances-from-load-balancer --load-balancer-name #{name_of_load_balancer} --instances #{instance_id}`)
end
get_ip_address_of_ec2_from_id(instance_id) click to toggle source
# File lib/zeployment.rb, line 44
def self.get_ip_address_of_ec2_from_id (instance_id)
  instance_description_response = `#{get_ip_address_of_ec2_from_id_command(instance_id)}`
  instance_description_hash = JSON.parse(instance_description_response)
  ip_address = instance_description_hash["Reservations"][0]["Instances"][0]["PublicIpAddress"]
  return ip_address
end
get_ip_address_of_ec2_from_id_command(instance_id) click to toggle source
# File lib/zeployment.rb, line 51
def self.get_ip_address_of_ec2_from_id_command (instance_id)
  return "aws ec2 describe-instances --instance-id #{instance_id}"
end
get_load_balancer_instances_description(name_of_load_balancer) click to toggle source
# File lib/zeployment.rb, line 12
def self.get_load_balancer_instances_description (name_of_load_balancer)
  load_balancers_instance_description_command = get_load_balancers_instances_description_command (name_of_load_balancer)
  load_balancer_instances_description = `#{load_balancers_instance_description_command}`
  return JSON.parse(load_balancer_instances_description)
end
get_load_balancer_particular_instance_data(name_of_load_balancer, instance_id) click to toggle source
# File lib/zeployment.rb, line 63
def self.get_load_balancer_particular_instance_data (name_of_load_balancer, instance_id)
  load_balancers_instance_description_command = "aws elb describe-instance-health --load-balancer-name #{name_of_load_balancer} --instances #{instance_id}"
  load_balancer_instances_description = `#{load_balancers_instance_description_command}`
  return JSON.parse(load_balancer_instances_description)
end
get_load_balancers_instances_description_command(name_of_load_balancer) click to toggle source
# File lib/zeployment.rb, line 18
def self.get_load_balancers_instances_description_command (name_of_load_balancer)
  return "aws elb describe-instance-health --load-balancer-name #{name_of_load_balancer}"
end
instance_is_in_service?(name_of_load_balancer, instance_id) click to toggle source
# File lib/zeployment.rb, line 69
def self.instance_is_in_service? (name_of_load_balancer, instance_id)
  load_balancer_insrance_data_hash = get_load_balancer_particular_instance_data name_of_load_balancer, instance_id
  return load_balancer_insrance_data_hash["InstanceStates"][0]["State"] == "InService"
end
login_and_run_commands(login_command, commands_to_run) click to toggle source
# File lib/zeployment.rb, line 94
def self.login_and_run_commands(login_command, commands_to_run)
  system("#{login_command} << #{commands_to_run} ")
end
number_of_instances_in_service(name_of_load_balancer) click to toggle source
# File lib/zeployment.rb, line 22
def self.number_of_instances_in_service (name_of_load_balancer)
  instances_in_service = 0
  load_balancer_instances_description_hash = get_load_balancer_instances_description(name_of_load_balancer)
  load_balancer_instances_description_hash["InstanceStates"].each do |instance_state|
    if instance_state["State"] == "InService"
      instances_in_service = instances_in_service + 1
    end
  end
  return instances_in_service
end
number_of_instances_not_in_service(name_of_load_balancer) click to toggle source
# File lib/zeployment.rb, line 33
def self.number_of_instances_not_in_service (name_of_load_balancer)
  instances_not_in_service = 0
  load_balancer_instances_description_hash = get_load_balancer_instances_description(name_of_load_balancer)
  load_balancer_instances_description_hash["InstanceStates"].each do |instance_state|
    if instance_state["State"] != "InService"
      instances_not_in_service = instances_not_in_service + 1
    end
  end
  return instances_not_in_service
end
number_of_registered_instances_to_loadbalancer(name_of_load_balancer) click to toggle source
# File lib/zeployment.rb, line 7
def self.number_of_registered_instances_to_loadbalancer (name_of_load_balancer)
  load_balancer_instances_description_hash = get_load_balancer_instances_description(name_of_load_balancer)
  return load_balancer_instances_description_hash["InstanceStates"].length
end
register_instance_with_load_balancer(name_of_load_balancer, instance_id) click to toggle source
# File lib/zeployment.rb, line 59
def self.register_instance_with_load_balancer (name_of_load_balancer, instance_id)
  JSON.parse(`aws elb register-instances-with-load-balancer --load-balancer-name #{name_of_load_balancer} --instances #{instance_id}`)
end
wait_till_the_instance_in_service(name_of_load_balancer, instance_id) click to toggle source
# File lib/zeployment.rb, line 88
def self.wait_till_the_instance_in_service(name_of_load_balancer, instance_id)
  while !instance_is_in_service?(name_of_load_balancer, instance_id) do
    puts ">>>>>>> Instance Not in Service <<<<<<<<<<<<<"
  end
end