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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

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