elk-acs-kubernetes/helm-charts/acs-engine-autoscaler

acs-engine-autoscaler

acs-engine-autoscaler is a node-level autoscaler for Kubernetes for clusters created with acs-engine.

TL;DR:

$ helm install stable/acs-engine-autoscaler -f values.yaml

Where values.yaml contains:

acsenginecluster:
  resourcegroup:
  azurespappid:
  azurespsecret:
  azuresptenantid:
  kubeconfigprivatekey:
  clientprivatekey:

Introduction

This chart bootstraps an acs-engine-autoscaler deployment on a Kubernetes cluster using the Helm package manager.

Prerequisites

• Kubernetes 1.6+

Installing the Chart

In order for the chart to configure the acs-engine-autoscaler properly during the installation process, you must provide some minimal configuration which can't rely on defaults. This includes all the values in the values.yaml file:

acsenginecluster:
  resourcegroup:
  azurespappid:
  azurespsecret:
  azuresptenantid:
  kubeconfigprivatekey:
  clientprivatekey:

To install the chart with the release name my-release:

$ helm install stable/acs-engine-autoscaler

The command deploys acs-engine-autoscaler on the Kubernetes cluster using the supplied configuration. The configuration section lists the parameters that can be configured during installation.

Tip: List all releases using helm list

Verifying Installation

To verify the acs-engine-autoscaler is configured properly find the pod that the deployment created and look at its logs. The result will look something similar to the following:

To verify that acs-engine-autoscaler has started, run:

  kubectl --namespace=default get pods -l "app=olfactory-bunny-acs-engine-autoscaler"

To verify that acs-engine-autoscaler is running as expected, run:
  kubectl logs $(kubectl --namespace=default get pods -l "app=olfactory-bunny-acs-engine-autoscaler" -o jsonpath="{.items[0].metadata.name}")

$ kubectl --namespace=default get pods -l "app=olfactory-bunny-acs-engine-autoscaler"

NAME                                                     READY     STATUS    RESTARTS   AGE
olfactory-bunny-acs-engine-autoscaler-1715934483-c673v   1/1       Running   0          10s

$ kubectl logs $(kubectl --namespace=default get pods -l "app=olfactory-bunny-acs-engine-autoscaler" -o jsonpath="{.items[0].metadata.name}")

2017-06-11 23:20:59,352 - autoscaler.cluster - DEBUG - Using kube service account
2017-06-11 23:20:59,352 - autoscaler.cluster - INFO - ++++ Running Scaling Loop ++++++
2017-06-11 23:20:59,421 - autoscaler.cluster - INFO - Pods to schedule: 0
2017-06-11 23:20:59,421 - autoscaler.cluster - INFO - ++++ Scaling Up Begins ++++++
2017-06-11 23:20:59,421 - autoscaler.cluster - INFO - Nodes: 1
2017-06-11 23:20:59,421 - autoscaler.cluster - INFO - To schedule: 0
2017-06-11 23:20:59,421 - autoscaler.cluster - INFO - Pending pods: 0
2017-06-11 23:20:59,422 - autoscaler.cluster - INFO - ++++ Scaling Up Ends ++++++
2017-06-11 23:20:59,422 - autoscaler.cluster - INFO - ++++ Maintenance Begins ++++++
2017-06-11 23:20:59,422 - autoscaler.engine_scaler - INFO - ++++ Maintaining Nodes ++++++
2017-06-11 23:20:59,423 - autoscaler.engine_scaler - INFO - node: k8s-agentpool1-29744472-4                                                   state: under-utilized-undrainable
2017-06-11 23:20:59,423 - autoscaler.cluster - INFO - ++++ Maintenance Ends ++++++
...

Uninstalling the Chart

To uninstall/delete the last deployment:

$ helm ls
$ helm delete [last deployment]

The command removes all the Kubernetes components associated with the chart and deletes the release.

Configuration

The following tables lists the configurable parameters of the acs-engine-autoscaler chart and their default values.

Parameter	Description	Default
resourcegroup	Name of the resource group containing the cluster	None. You must supply one.
azurespappid	An Azure service principal id	None. You must supply one.
azurespsecret	An Azure service principal secret	None. You must supply one.
azuresptenantid	An Azure service principal tenant id	None. You must supply one.
kubeconfigprivatekey	The key passed to the kubeConfigPrivateKey parameter in your azuredeploy.parameters.json generated with acs-engine	None. You must supply one.
clientprivatekey	The key passed to the clientPrivateKey parameter in your azuredeploy.parameters.json generated with acs-engine	None. You must supply one.
acsdeployment	[OPTIONAL] The name of the deployment used to deploy the kubernetes cluster initially. If not provided, it is defaulted to azuredeploy	None.
sleeptime	[OPTIONAL] The number of seconds to sleep between scaling loops. If not provided, a default of 60 seconds is used.	60
ignorepools	[OPTIONAL] A list of comma seperated pool names the autoscaler should ignore.	None.
spareagents	[OPTIONAL] Number of agents per pool that should always remain up. If not provided, a default of 1 agent is used.	1

Specify each parameter you'd like to override using a YAML file as described above in the [installation](#Installing the Chart) section.

Credentials

You need to provide a Service Principal to the autoscaler. You can create one using Azure CLI:

az ad sp create-for-rbac