Manage a conference application with K8S build blocks (PoC).
Everything starts with a Conference custom resource definition. When a new
conference is created or updated/delete a shared informer push the event in a
message queue where a controller deploy a dedicated K8S namespace with the
application deploy.
Road to CloudConf2020? Check it out: https://cloudconf.it
Create the cluster
kind create cluster --config kind.yamlStart development
skaffold runCheck existing conferences
kubectl get conferences
No resources found in default namespace.Now create a new conference
kubectl apply -f examples/cloudconf2020.yamlCheck existing conferences
kubectl get conferences
NAME TITLE ON DAY
cloudconf2020 CloudConf 2020 2020-03-19
Check also the dedicated namespace!
kubectl describe ns cloudconf2020
Name: cloudconf2020
Labels: <none>
Annotations: <none>
Status: Active
No resource quota.
No resource limits.Now create a conference purchase plan
kubectl apply -f examples/cloudconf2020-plan.yamlAnd get the created plan
kubectl get plan -n cloudconf2020
NAME TITLE ACTIVE PRICE
super-early-bird Super Early Bird Ticket true 29.9Then create an order
kubectl apply -f examples/cloudconf2020-order-1.yamlThen check the created order
kubectl get orders -n cloudconf2020
NAME PLAN COUPON STATUS CURRENT DESIRED PRICE DATE
order-1 super-early-bird PENDING 0 1 29.9 357dThe order is correctly created but there are not tickets because its status is "PENDING"
kubectl get tickets -n cloudconf2020
No resources found in cloudconf2020 namespace.Tickets will be generated only where the order status is confirmed, to confirm the order you can pay for it (receiving the payment webhook), have a free plan or the Coupon value is high enough to set a free ticket (price=0)
Generate a free event
cat <<EOF > meetup.yaml
apiVersion: "app.corley.it/v1"
kind: Conference
metadata:
name: meetup
spec:
title: "Free Meetup"
EOF
kubectl apply -f meetup.yamlThen a free plan
cat <<EOF > plan.yaml
apiVersion: "app.corley.it/v1"
kind: Plan
metadata:
name: free-plan
namespace: meetup
spec:
title: "Free Ticket"
price: 0
active: true
EOF
kubectl apply -f plan.yamlNow create an order
cat <<EOF > order.yaml
apiVersion: "app.corley.it/v1"
kind: Order
metadata:
name: order-1
namespace: meetup
spec:
planRef: free-plan
price: 0
date: "2019-01-01T08:00:00Z"
quantity: 1
EOF
kubectl apply -f order.yamlBecase the order price is 0 (free event in this case) the ticket generation is completely automated. Just get tickets for this order
kubectl get tickets -n meetup
NAME ORDER FIRSTNAME LASTNAME
order-1-5193329 order-1
You can "scale" the order and get multiple tickets. Check this out:
kubectl scale order --replicas=6 --namespace meetup order-1Then check your tickets
kubectl get tickets -n meetup
NAME ORDER FIRSTNAME LASTNAME
order-1-2729627 order-1
order-1-3468125 order-1
order-1-3598565 order-1
order-1-5193329 order-1
order-1-9476971 order-1
order-1-9926811 order-1Just receive the payment event (POST call on the payment gateway)
curl -XPOST -d 'custom=order-1&payment_status=Completed&mc_gross=29.90&mc_currency=EUR' http://localhost/payment-gateway/cloudconf2020If you check the order event list now you will see the payment confirmation event and then the tickets will be created.
If you want to drop out everything about a conference, just drop the
conference element
kubectl delete conference CloudConf2020And checkout your namespaces:
NAME STATUS AGE
cloudconf2020 Terminating 15m
default Active 43m
ingress-nginx Active 32m
kconference Active 19m
kube-node-lease Active 43m
kube-public Active 43m
kube-system Active 43mAs you see the namespace is now in Terminating and soon everything will be
removed!
Just create a resource quota!
cat <<EOF > object-counts.yaml
apiVersion: v1
kind: ResourceQuota
metadata:
name: conference-object-counts
namespace: cloudconf2020
spec:
hard:
"count/orders.app.corley.it": "10"
"count/tickets.app.corley.it": "10"
"count/plans.app.corley.it": "3"
"count/coupons.app.corley.it": "5"
EOFNow you have limits for your conference!
kubectl apply -f object-counts.yamlAnd than check your conference namespace current situation:
kubectl describe namespace cloudconf2020
Name: cloudconf2020
Labels: <none>
Annotations: <none>
Status: Active
Resource Quotas
Name: conference-object-counts
Resource Used Hard
-------- --- ---
count/coupons.app.corley.it 0 5
count/orders.app.corley.it 1 10
count/plans.app.corley.it 1 3
count/tickets.app.corley.it 7 10
No resource limits.Deploy nginx ingress
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/baremetal/service-nodeport.yamlThen expose the service with socat
make dev
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent