Kubernetes Autoscaler on AWS not working - amazon-web-services

Question

I am trying to setup Kubernetes autoscaler with Amazon AWS as described here: DOCS but I am getting this error in my cluster-autoscaler pod logs:
E0411 09:23:25.529212 1 static_autoscaler.go:118] Failed to update node registry: RequestError: send request failed caused by: Post https://autoscaling.us-west-2a.amazonaws.com/: dial tcp: lookup autoscaling.us-west-2a.amazonaws.com on 10.96.0.10:53: no such host
Context:
I've created AWS Autoscaling Group named KubeAutoscale from Launch Configration with my custom instance AMI which has installed Ubuntu server 16.04 LTS (HVM) and Docker with Kubernetes (just raw install).
In AWS Autoscaling Group I've put 2 instances as minimum and maximum of 5 instances (they are in us-west-2a region) and I logged in on one of those 2 and setup Kubernetes cluster, logged in on other instance and add it to created cluster and logged again on master (first) instance run Autoscaler with configuration:
---
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
k8s-addon: cluster-autoscaler.addons.k8s.io
k8s-app: cluster-autoscaler
name: cluster-autoscaler
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
name: cluster-autoscaler
labels:
k8s-addon: cluster-autoscaler.addons.k8s.io
k8s-app: cluster-autoscaler
rules:
- apiGroups: [""]
resources: ["events","endpoints"]
verbs: ["create", "patch"]
- apiGroups: [""]
resources: ["pods/eviction"]
verbs: ["create"]
- apiGroups: [""]
resources: ["pods/status"]
verbs: ["update"]
- apiGroups: [""]
resources: ["endpoints"]
resourceNames: ["cluster-autoscaler"]
verbs: ["get","update"]
- apiGroups: [""]
resources: ["nodes"]
verbs: ["watch","list","get","update"]
- apiGroups: [""]
resources: ["pods","services","replicationcontrollers","persistentvolumeclaims","persistentvolumes"]
verbs: ["watch","list","get"]
- apiGroups: ["extensions"]
resources: ["replicasets","daemonsets"]
verbs: ["watch","list","get"]
- apiGroups: ["policy"]
resources: ["poddisruptionbudgets"]
verbs: ["watch","list"]
- apiGroups: ["apps"]
resources: ["statefulsets"]
verbs: ["watch","list","get"]
- apiGroups: ["storage.k8s.io"]
resources: ["storageclasses"]
verbs: ["watch","list","get"]
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: Role
metadata:
name: cluster-autoscaler
namespace: kube-system
labels:
k8s-addon: cluster-autoscaler.addons.k8s.io
k8s-app: cluster-autoscaler
rules:
- apiGroups: [""]
resources: ["configmaps"]
verbs: ["create"]
- apiGroups: [""]
resources: ["configmaps"]
resourceNames: ["cluster-autoscaler-status"]
verbs: ["delete","get","update"]
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: cluster-autoscaler
labels:
k8s-addon: cluster-autoscaler.addons.k8s.io
k8s-app: cluster-autoscaler
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-autoscaler
subjects:
- kind: ServiceAccount
name: cluster-autoscaler
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
name: cluster-autoscaler
namespace: kube-system
labels:
k8s-addon: cluster-autoscaler.addons.k8s.io
k8s-app: cluster-autoscaler
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: cluster-autoscaler
subjects:
- kind: ServiceAccount
name: cluster-autoscaler
namespace: kube-system
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: cluster-autoscaler
namespace: kube-system
labels:
app: cluster-autoscaler
spec:
replicas: 1
selector:
matchLabels:
app: cluster-autoscaler
template:
metadata:
labels:
app: cluster-autoscaler
spec:
serviceAccountName: cluster-autoscaler
containers:
- image: k8s.gcr.io/cluster-autoscaler:v0.6.0
name: cluster-autoscaler
resources:
limits:
cpu: 100m
memory: 300Mi
requests:
cpu: 100m
memory: 300Mi
command:
- ./cluster-autoscaler
- --v=4
- --stderrthreshold=info
- --cloud-provider=aws
- --skip-nodes-with-local-storage=false
- --nodes=2:5:KubeAutoscale
env:
- name: AWS_REGION
value: us-west-2a
volumeMounts:
- name: ssl-certs
mountPath: /etc/ssl/certs/ca-certificates.crt
readOnly: true
imagePullPolicy: "Always"
volumes:
- name: ssl-certs
hostPath:
path: "/etc/ssl/certs/ca-certificates.crt"

Answer 1

You have the configuration issue:
env:
- name: AWS_REGION
value: us-west-2a
Your AWS region is us-west-2, but AZ is us-west-2a. That's why when Autoscaling generates the URL of autoscaling endpoint, the result is https://autoscaling.us-west-2a.amazonaws.com/ instead of https://autoscaling.us-west-2.amazonaws.com/ - which is the correct one.
To fix it, just set AWS_REGION to us-west-2 instead of us-west-2a.