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‎Kubernetese/hpa/README.md‎

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# Horizontal Pod autoscaler
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## Install Metrics server -
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> Clone this repository and install metrics server. Please do note that this setup is good for dev/qa environment. A lot of considerations must be put while installing metrics server in production environment. The official metrics-server repository is kept at https://github.com/kubernetes-incubator/metrics-server and we are using the same repo with few changes.
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> Install the metrics server
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` cd metrics-server`
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` kubectl create -f . `
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## Create nginx deployment, service & hpa
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> It is mandatory to set requests on cpu utilization as HPA requires CPU metrics.
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` kubectl create -f hpa.yaml`
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~~~
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kubectl get hpa
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NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
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nginx Deployment/nginx 0%/40% 3 5 3 55s
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~~~
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## Test the HPA using apache bench
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> Apache Bench (ab) is a load testing and benchmarking tool for Hypertext Transfer Protocol (HTTP) server. It can be run from command line and it is very simple to use. A quick load testing output can be obtained in just one minute
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### install apache benchmark tool
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` apt-get install apache2-utils`
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#### Get the service IP address using
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`kubectl get svc`
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### send load on to the PODS
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` ab -n 500000 -c 1000 http://10.97.161.152/`
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` -n requests Number of requests to perform`
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` -c concurrency Number of multiple requests to make at a time`

‎Kubernetese/hpa/hpa.yml‎

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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: nginx
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labels:
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app: nginx
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: nginx
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template:
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metadata:
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name: nginxpod
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx:latest
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resources:
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limits:
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cpu: 20m ## 10% of 1 core on your system
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: nginx-svc
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spec:
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type: ClusterIP ## this is default if we do not type in service definition
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selector:
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app: nginx
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ports:
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- protocol: TCP
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port: 80
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targetPort: 80
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---
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apiVersion: autoscaling/v1
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kind: HorizontalPodAutoscaler
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metadata:
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name: nginx-hpa
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spec:
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scaleTargetRef:
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apiVersion: apps/v1
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kind: Deployment
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name: nginx
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minReplicas: 1
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maxReplicas: 10
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targetCPUUtilizationPercentage: 10
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