escrichov / kubernetes-tutorial

Cluster Installation

1. Create Kubernetes Cluster in digital Ocean
2. Install Kubectl https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl
3. Wait until all nodes start
4. Download Kubernetes Config file
5. Copy file to $HOME/.kube/config
6. Test conection to kubernetes cluster

kubectl get nodes

3. Install metrics-server

git clone https://github.com/kubernetes-incubator/metrics-server
cp metrics-server-deployment.yaml metrics-server/deploy/1.8+/
cd metrics-server && kubectl create -f deploy/1.8+/

Create or Update

kubectl apply -f autoscaling.yaml

Delete

kubectl apply -f autoscaling.yaml

View autoscaling

In terminal 1:

watch kubectl get hpa

View deployments

In terminal 2:

watch kubectl get deployment php-apache

Increase load

In terminal 3:

kubectl run -i --tty load-generator --image=busybox /bin/sh
while true; do wget -q -O- http://php-apache.default.svc.cluster.local; done

Decrease load

In terminal 3:

type <Ctrl> + C.

View usage of nodes (servers)

kubectl top node

Guides:

• DigitalOcean volumes
• Deploy Django
• Deploy Django + Redis + Postgresql https://github.com/waprin/kubernetes_django_postgres_redis https://www.agiliq.com/blog/2018/07/django-on-kubernetes/ https://nick.sarbicki.com/blog/deploy-django-celery-on-k8s/ https://harishnarayanan.org/writing/kubernetes-django/ https://2017.djangocon.us/talks/end-to-end-django-on-kubernetes/
• Postgresql HA https://dzone.com/articles/postgresql-kubernetes-how-to-run-ha-postgres-on-ku https://portworx.com/ha-postgresql-kubernetes/
• Redis HA
• Cronjobs
• On off containers
• Citus https://github.com/jinhong-/citus-k8s
• Deploy kubernetes with helm