kubernetes-yaml/learn/learn-kubernetes-master/kiamol/ch12/lab/README.md

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# Ch12 lab
## Setup
Deploy the namespaces & Services:
```
kubectl apply -f lab/namespaces.yaml -f lab/services.yaml
```
Find out how many cores your node has available:
```
kubectl get nodes -o jsonpath='{.items[].status.allocatable.cpu}'
```
> Quotas should allocate 50% for UAT, 25% for test and 25% for dev
## Sample Solution
My node has 8 CPU cores, so my [quotas.yaml](./solution/quotas.yaml) is set with 4 cores for UAT and 2 each for dev and test.
Set the quotas:
```
kubectl apply -f lab/solution/quotas.yaml
```
My Pi app is set in [web.yaml](./solution/web.yaml) to use 0.5 cores, so I can run at least four replicas in every environment.
Deploy to each namespace:
```
kubectl apply -f lab/solution/web.yaml -n pi-dev
kubectl apply -f lab/solution/web.yaml -n pi-test
kubectl apply -f lab/solution/web.yaml -n pi-uat
```
You should find all ReplicaSets are running at desired capacity:
```
kubectl get rs -l app=pi-web --all-namespaces
```
UAT has enough quota to run 8 replicas on my node:
```
kubectl scale deploy/pi-web --replicas 8 -n pi-uat
```
... except that it doesn't:
```
kubectl get rs -l app=pi-web -n pi-uat\
# returns 6 Pods running out of 8 desired
```
> You can't use 100% of the node's CPU because Kubernetes system components allocate CPU themselves.
## Teardown
Remove the namespaces and that removes everything:
```
kubectl delete ns -l kiamol=ch12-lab
```