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148 lines
3.8 KiB
Markdown
148 lines
3.8 KiB
Markdown
# Vertical Pod Autoscaling
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<a href="https://youtu.be/jcHQ5SKKTLM" title="Kubernetes"><img src="https://i.ytimg.com/vi/jcHQ5SKKTLM/hqdefault.jpg" width="20%" alt="vertical auto scaling" /></a>
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## We need a Kubernetes cluster
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Lets create a Kubernetes cluster to play with using [kind](https://kind.sigs.k8s.io/docs/user/quick-start/)
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```
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kind create cluster --name vpa --image kindest/node:v1.30.4
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```
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<hr/>
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## Metric Server
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<br/>
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* For `Cluster Autoscaler` - On cloud-based clusters, Metric server may already be installed. <br/>
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* For `HPA` - We're using kind
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[Metric Server](https://github.com/kubernetes-sigs/metrics-server) provides container resource metrics for use in autoscaling pipelines <br/>
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Because I run K8s `1.30` in `kind`, the Metric Server version i need is `0.7.2` <br/>
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We will need to deploy Metric Server [0.7.2](https://github.com/kubernetes-sigs/metrics-server/releases/tag/v0.7.2) <br/>
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I used `components.yaml`from the release page link above. <br/>
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<b>Important Note</b> : For Demo clusters (like `kind`), you will need to disable TLS <br/>
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You can disable TLS by adding the following to the metrics-server container args <br/>
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<b>For production, make sure you remove the following :</b> <br/>
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```
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- --kubelet-insecure-tls
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```
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Deployment: <br/>
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```
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cd kubernetes\autoscaling
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kubectl -n kube-system apply -f .\components\metric-server\components.yaml
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#test
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kubectl -n kube-system get pods
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#note: wait for metrics to populate!
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kubectl top nodes
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```
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## VPA
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VPA docs [here](https://github.com/kubernetes/autoscaler/tree/master/vertical-pod-autoscaler#install-command) <br/>
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Let's install the VPA from a container that can access our cluster
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```
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cd kubernetes/autoscaling/vertical-pod-autoscaling
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docker run -it --rm -v ${HOME}:/root/ -v ${PWD}:/work -w /work --net host debian:bookworm bash
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# install git
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apt-get update && apt-get install -y git curl nano
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# install kubectl
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curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
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chmod +x ./kubectl
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mv ./kubectl /usr/local/bin/kubectl
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cd /tmp
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git clone https://github.com/kubernetes/autoscaler.git
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cd autoscaler/vertical-pod-autoscaler/
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# you may need to generate VPA certificates
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bash ./pkg/admission-controller/gencerts.sh
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# deploy the VPA
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./hack/vpa-up.sh
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# after few seconds, we can see the VPA components in:
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kubectl -n kube-system get pods
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```
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## Build and deploy example app
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```
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# build
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cd kubernetes\autoscaling\components\application
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docker build . -t aimvector/application-cpu:v1.0.0
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# push
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docker push aimvector/application-cpu:v1.0.0
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# deploy
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kubectl apply -f deployment.yaml
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# metrics
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kubectl top pods
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```
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## Generate some traffic
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Let's deploy a simple traffic generator pod
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```
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cd kubernetes\autoscaling\components\application
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kubectl apply -f .\traffic-generator.yaml
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# get a terminal to the traffic-generator
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kubectl exec -it traffic-generator -- sh
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# install wrk
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apk add --no-cache wrk
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# simulate some load
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wrk -c 5 -t 5 -d 99999 -H "Connection: Close" http://application-cpu
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```
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# Deploy an example VPA
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```
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kubectl apply -f .\vertical-pod-autoscaling\vpa.yaml
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kubectl describe vpa application-cpu
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```
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# Deploy Goldilocks
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```
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cd /tmp
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git clone https://github.com/FairwindsOps/goldilocks.git
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cd goldilocks/hack/manifests/
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kubectl create namespace goldilocks
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kubectl -n goldilocks apply -f ./controller
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kubectl -n goldilocks apply -f ./dashboard
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kubectl label ns default goldilocks.fairwinds.com/enabled=true
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kubectl label ns default goldilocks.fairwinds.com/vpa-update-mode="off"
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kubectl -n goldilocks port-forward svc/goldilocks-dashboard 80
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``` |