Terraform by Yevgeniy Brikman

Author:Yevgeniy Brikman
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2017-03-23T04:00:00+00:00

Module Outputs

To define an auto scaling schedule, add the following two aws_autoscaling_schedule resources to prod/services/webserver-cluster/main.tf:

resource "aws_autoscaling_schedule" "scale_out_during_business_hours" { scheduled_action_name = "scale-out-during-business-hours" min_size = 2 max_size = 10 desired_capacity = 10 recurrence = "0 9 * * *" } resource "aws_autoscaling_schedule" "scale_in_at_night" { scheduled_action_name = "scale-in-at-night" min_size = 2 max_size = 10 desired_capacity = 2 recurrence = "0 17 * * *" }

This code uses one aws_autoscaling_schedule resource to increase the number of servers to 10 during the morning hours (the recurrence parameter uses cron syntax, so "0 9 * * *" means “9 a.m. every day”) and a second aws_autoscaling_schedule resource to decrease the number of servers at night ("0 17 * * *" means “5 p.m. every day”). However, both usages of aws_autoscaling_schedule are missing a required parameter, autoscaling_group_name, which specifies the name of the ASG. The ASG itself is defined within the webserver-cluster module, so how do you access its name? In a general-purpose programming language, functions can return values:

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