dear visitors please visit Miguel's article below for setting up celery in kube with horizontal autoscaling.

https://miguescri.com/post/2021-05-22-celery-hpa

** this repo is archived **

a hello-world style excercise to demo kubernetes' autoscaling capability for celery workers.

• files used here are based off below link:

  https://github.com/fabric8io/gitcontroller/tree/master/vendor/k8s.io/kubernetes/examples/celery-rabbitmq

• below tested with a physical machine with ubuntu 18.04 installed.

• enable VT-X/AMD-v enabled. Enabling it in the BIOS is mandatory.

• install virtualbox (for physical machine), docker, minikube.

  for physical machine: see below links for installation steps: https://docs.docker.com/install/linux/docker-ce/ubuntu/ https://kubernetes.io/docs/tasks/tools/install-minikube/ https://askubuntu.com/questions/367248/how-to-install-virtualbox-from-command-line https://github.com/aws-samples/aws-workshop-for-kubernetes/blob/master/03-path-application-development/301-local-development/readme.adoc#setup-on-ec2-if-you-do-not-virtualbox-on-your-laptop https://www.radishlogic.com/kubernetes/running-minikube-in-aws-ec2-ubuntu/

• setup minikube

  optional: sudo -i

  FOR Physical Machine: minikube stop && minikube start --memory 8192 --insecure-registry localhost:5000

  FOR EC2 (not tested): sudo minikube start --vm-driver=none --memory 8192 --insecure-registry localhost:5000

  install cpu monitor pulugin (kubernetes/minikube#1095) minikube addons enable heapster

  Run below for each shell that will be executing kubectl,minikube,docker commands. eval $(minikube docker-env)

• build images using docker daemon within minikube

  cd examples/celery-rabbitmq/task

  docker build -t celery-task .

  cd examples/celery-rabbitmq/worker

  docker build -t celery-worker .

  cd ../../..

• verify docker images within minikube (different than sudo docker images)

  docker images

• start up pods/services

  kubectl create -f examples/celery-rabbitmq/rabbitmq-service.yaml

  kubectl create -f examples/celery-rabbitmq/rabbitmq-controller.yaml

  kubectl create -f examples/celery-rabbitmq/flower-service.yaml

  kubectl create -f examples/celery-rabbitmq/flower-controller.yaml

  kubectl create -f examples/celery-rabbitmq/celery-deployment.yaml

  kubectl create -f examples/celery-rabbitmq/hpa.yaml

  kubectl create -f examples/celery-rabbitmq/celery-task-controller.yaml

  kubectl delete -f examples/celery-rabbitmq/rabbitmq-service.yaml

  kubectl delete -f examples/celery-rabbitmq/rabbitmq-controller.yaml

  kubectl delete -f examples/celery-rabbitmq/flower-service.yaml

  kubectl delete -f examples/celery-rabbitmq/flower-controller.yaml

  kubectl delete -f examples/celery-rabbitmq/celery-deployment.yaml

  kubectl delete -f examples/celery-rabbitmq/hpa.yaml

  kubectl delete -f examples/celery-rabbitmq/celery-task-controller.yaml

• monitor minikube, rabbit, flower via web interface via port forwarding.

  HOST:

  kubectl proxy

  minikube dashboard --url

  kubectl port-forward svc/flower-service 5555:5555

  kubectl port-forward pod/rabbitmq-controller-p5btj 15672:15672

  CLIENT:

  export myurl=user@hostname

  ssh -L 8001:127.0.0.1:8001 $myurl -v -v

  ssh -L 8002:127.0.0.1:15672 $myurl -v -v

  ssh -L 8003:127.0.0.1:5555 $myurl -v -v

  open chrome and goto: http://localhost:8001/api/v1/namespaces/kube-system/services/http:kubernetes-dashboard:/proxy

• if docker container fails running, run docker container by itself to debug.

  docker run -t celery-worker

  docker run -t celery-task

• misc

  kubectl exec -it shell-demo -- /bin/bash

  python -m celery inspect active -b amqp://$RABBITMQ_SERVICE_SERVICE_HOST

• autoscale misc

  kubectl get hpa

  watch kubectl get hpa

  https://medium.com/google-cloud/kubernetes-horizontal-pod-scaling-190e95c258f5

ref.

https://stackoverflow.com/a/48999680/868736 kubectl autoscale deployment celery --cpu-percent=50 --min=1 --max=10 kubectl get pods kubectl get svc flower-service kubectl port-forward svc/flower-service 5555:5555 kubectl delete pods,services flower-service kubectl exec worker-controller-5dfd669d5f-28vlk env | grep RABBITMQ kubectl get deployments

https://kubernetes.io/docs/concepts/workloads/controllers/

--

WIP. https://kubernetes.io/blog/2016/07/autoscaling-in-kubernetes/ kubernetes/minikube#604

https://plugaru.org/2018/01/03/rabbitmq-celery-kubernetes-ha/ https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/