volumetype == io1 is broken with the error "Iops is required for a provisioned IOPS volume"

[navinkbe7]

When we try to make the root volume of the nodes as io1 volume type , i get an error message ,

W0825 17:39:46.585143   87752 executor.go:109] error running task "LaunchConfiguration/nodes.xxxxxxxxxxxxxx" (7m16s remaining to succeed): error creating AutoscalingLaunchConfiguration: ValidationError: Iops is required for a provisioned IOPS volume.

How to reproduce :
I followed Changing the root volume size or type section in the below link.
https://github.com/kubernetes/kops/blob/master/docs/instance_groups.md

Here is what we found,
Changes I made to the instance-group is not persisting in the s3 state store.
For example,

1. Do a kops edit ig --name $NAME nodes and then edit the volume type.

Here is my instancegroups/nodes.yaml

piVersion: kops/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: 2017-08-25T22:34:03Z
  labels:
    kops.k8s.io/cluster: xxxxxxxxxxxxxxxxxxxxxxxxxx
  name: nodes
spec:
  associatePublicIp: false
  image: coreos.com/CoreOS-stable-1409.9.0-hvm
  machineType: m4.2xlarge
  maxSize: 3
  minSize: 3
  role: Node
  rootVolumeIops: 200
  rootProvisionedIops: 200
  rootVolumeSize: 200
  rootVolumeType: io1
  subnets:
  - us-east-1a
  - us-east-1b
  - us-east-1c
  - us-east-1d
  - us-east-1e
  tenancy: default

2. now do a kops get ig --name $NAME nodes -o yaml , changes you made is gone .

rootVolumeIops: 200
rootProvisionedIops: 200

are missing .

Think kops doesn't like rootProvisionedIops & rootVolumeIops even though the docs claim the other way .

Kops version I am on,

$ kops version
Version 1.7.0

[robinpercy]

@navinkbe7 the provisioned IOPS params aren't available in 1.7.0, just in master. They were merged after the release: #3102

[navinkbe7]

@robinpercy 👍

[integrii]

To be clear, this was not working in 1.7.1 still. If you follow the guide here, your cluster update will not work. You must use the 1.8 pre-release version.