This repository consists of everything you need to setup simple Kubernetes cluster and demonstrate usage of KEDA redis and mysql scalers. For more samples check https://github.com/kedacore/samples
The included helper provides an easy way to perform both 0 -> n and n -> 0 scalings.
The deployment consists of 4 components:
- MySQL instance
- Redis instance
- Dummy pod that will be scaled up and down
- App service that provides some helper methods
kubectl apply -f deployment/Follow the official KEDA guide https://keda.sh/deploy/
To observe how everything works you can watch two things:
- number of pods and their state:
watch -n2 "kubectl get pods" - HPA stats:
watch -n2 "kubectl get hpa"
To scale the dummy deployment using
Redis scaler first we have to
deploy the ScaledObjects:
kubectl apply -f keda/redis-hpa.yamlthis should result in creation of a new ScaledObjects and new HPA
# kubectl get scaledobjects
NAME DEPLOYMENT TRIGGERS AGE
redis-scaledobject dummy redis 5s
# kubectl get hpa
NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
keda-hpa-dummy Deployment/dummy <unknown>/10 (avg) 1 4 0 45sTo scale up we have to populate the Redis queue. To do this we can use the helper app:
kubectl exec -it $(k get pods | grep "server" | cut -f 1 -d " ") app redis publishand to scale down:
kubectl exec -it $(k get pods | grep "server" | cut -f 1 -d " ") app redis drainTo scale the dummy deployment using
MySQL scaler first we have to
deploy the ScaledObjects:
kubectl apply -f keda/mysql-hpa.yamlthis should result again in creation of ScaleObject and an HPA:
# kubectl get scaledobjects
NAME DEPLOYMENT TRIGGERS AGE
mysql-scaledobject dummy redis 5s
# kubectl get hpa
NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
keda-hpa-dummy Deployment/dummy <unknown>/10 (avg) 1 4 0 45sTo scale up we have to insert some values to MySQL database. To do this we can use the helper app:
kubectl exec $(kubectl get pods | grep "server" | cut -f 1 -d " ") -- keda-talk mysql insertand to scale down:
kubectl exec $(kubectl get pods | grep "server" | cut -f 1 -d " ") -- keda-talk mysql delete
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