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Merge pull request #517 from stakater/add-notes

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[add-notes] update local.tf file
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Thierno IB. BARRY
2019-09-20 21:35:50 +02:00
committed by GitHub
parent f702467368 185cd4499e
commit 0cc058c52c
2 changed files with 6 additions and 2 deletions
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4
docs/autoscaling.md
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@@ -28,6 +28,10 @@ To install the chart, simply run helm with the `--values` option:
helm install stable/cluster-autoscaler --values=path/to/your/values-file.yaml helm install stable/cluster-autoscaler --values=path/to/your/values-file.yaml
``` ```
`NOTE`
There is a variable `asg_desired_capacity` given in the `local.tf` file, currently it can be used to change the desired worker(s) capacity in the autoscaling group but currently it is being ignored in terraform to reduce the [complexities](https://github.com/terraform-aws-modules/terraform-aws-eks/issues/510#issuecomment-531700442) and the feature of scaling up and down the cluster nodes is being handled by the cluster autoscaler.
## See More ## See More
[Using AutoScalingGroup MixedInstancesPolicy](https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/aws/README.md#using-autoscalinggroup-mixedinstancespolicy) [Using AutoScalingGroup MixedInstancesPolicy](https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/aws/README.md#using-autoscalinggroup-mixedinstancespolicy)

4
local.tf
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@@ -23,9 +23,9 @@ locals {
name = "count.index" # Name of the worker group. Literal count.index will never be used but if name is not set, the count.index interpolation will be used. name = "count.index" # Name of the worker group. Literal count.index will never be used but if name is not set, the count.index interpolation will be used.
tags = [] # A list of map defining extra tags to be applied to the worker group ASG. tags = [] # A list of map defining extra tags to be applied to the worker group ASG.
ami_id = data.aws_ami.eks_worker.id # AMI ID for the eks workers. If none is provided, Terraform will search for the latest version of their EKS optimized worker AMI. ami_id = data.aws_ami.eks_worker.id # AMI ID for the eks workers. If none is provided, Terraform will search for the latest version of their EKS optimized worker AMI.
asg_desired_capacity = "1" # Desired worker capacity in the autoscaling group. asg_desired_capacity = "1" # Desired worker capacity in the autoscaling group and changing its value will not affect the autoscaling group's desired capacity because the cluster-autoscaler manages up and down scaling of the nodes. Cluster-autoscaler add nodes when pods are in pending state and remove the nodes when they are not required by modifying the desirec_capacity of the autoscaling group. Although an issue exists in which if the value of the asg_min_size is changed it modifies the value of asg_desired_capacity.
asg_max_size = "3" # Maximum worker capacity in the autoscaling group. asg_max_size = "3" # Maximum worker capacity in the autoscaling group.
asg_min_size = "1" # Minimum worker capacity in the autoscaling group. asg_min_size = "1" # Minimum worker capacity in the autoscaling group. NOTE: Change in this paramater will affect the asg_desired_capacity, like changing its value to 2 will change asg_desired_capacity value to 2 but bringing back it to 1 will not affect the asg_desired_capacity.
asg_force_delete = false # Enable forced deletion for the autoscaling group. asg_force_delete = false # Enable forced deletion for the autoscaling group.
asg_initial_lifecycle_hooks = [] # Initital lifecycle hook for the autoscaling group. asg_initial_lifecycle_hooks = [] # Initital lifecycle hook for the autoscaling group.
asg_recreate_on_change = false # Recreate the autoscaling group when LT or LC change. asg_recreate_on_change = false # Recreate the autoscaling group when LT or LC change.