VPA demo

README.md

VPA demo

Based on the official docs and the Banzai Cloud blog post by Toader Sebastian.

Prerequisites

Environment:

$ minishift version
minishift v1.21.0+a8c8b37

$ kubectl version --short
Client Version: v1.9.1
Server Version: v1.9.1+a0ce1bc657

$ minishift start --cpus=4 --memory=4GB
$ oc login -u system:admin

Install VPA

Get VPA bits and set it up:

$ git clone https://github.com/kubernetes/autoscaler.git
$ cd autoscaler/vertical-pod-autoscaler
$ ./hack/vpa-up.sh

Expect now to see the following:

$ kubectl get po -n kube-system
NAME                                        READY     STATUS    RESTARTS   AGE
vpa-admission-controller-6b758d8678-9kddd   1/1       Running   0          55s
vpa-recommender-5dfc7669f7-m44vg            1/1       Running   0          58s
vpa-updater-5d596b7897-gm9zx                1/1       Running   0          58s

$ kubectl get crd
NAME                                                      AGE
verticalpodautoscalercheckpoints.poc.autoscaling.k8s.io   1m
verticalpodautoscalers.poc.autoscaling.k8s.io             1m

Install Prometheus

Note: Prometheus must be deployed into the monitoring namespace with a service named prometheus pointing to it. Using Prometheus for OpenShift standalone as the basis.

$ oc new-project monitoring
$ oc create secret generic prom --from-file=prometheus/prometheus.yml
$ oc process -f prometheus/app.yaml | oc apply -f -

Test and use VPA

$ oc new-project vpa-demo
$ kubectl apply -f test/app.yaml
$ kubectl apply -f test/vpa.yaml

prometheus.yml

global:
  scrape_interval:        5s
  evaluation_interval:    5s
  
scrape_configs:

- job_name:               'kubernetes-nodes'
  scheme:                 https
  tls_config:
    ca_file:              /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
  bearer_token_file:      /var/run/secrets/kubernetes.io/serviceaccount/token

  kubernetes_sd_configs:
  - role:                 node

  relabel_configs:
  - action:               labelmap
    regex:                __meta_kubernetes_node_label_(.+)