exercice.md

Travail sur les labels

Nettoyer l'environnement précédent

kubectl delete pods --all

Let's deploy a webserver

Create a new file nginx.yaml

apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    env: dev
spec:
  containers:
  - name: web
    image: nginx:1.9

kubectl apply -f nginx.yaml

Let's display the labels of the pods:

kubectl get pod/nginx --show-labels
nginx   1/1     Running   0          100s   env=dev

Add a new label to the pod:

kubectl label pod/webserver owner=student

kubectl get pod/nginx --show-labels NAME READY STATUS RESTARTS AGE LABELS nginx 1/1 Running 0 100s env=dev,owner=student

Filter the pods by labels:

kubectl get pods -l env=dev NAME READY STATUS RESTARTS AGE nginx 1/1 Running 0 3m

kubectl get pods -l env=prod No resources found in training namespace.

Remove a label from a pod

kubectl label po nginx env-

kubectl get po nginx --show-labels nginx 1/1 Running 0 4m5s owner=student

## Let's use the selector

Create a new file **apache.yaml**

```yaml
apiVersion: v1
kind: Pod
metadata:
  name: apache
  labels:
    env: prod
    owner: admin
spec:
  containers:
  - name: web
    image: httpd:2.4

Let's run a new container

kubectl apply -f apache.yaml

kubectl get pods --show-labels
NAME         READY     STATUS    RESTARTS   AGE       LABELS
mytomcat     1/1       Running   0          8m        env=development,owner=nicolas
realtomcat   1/1       Running   0          12s       env=production,owner=kevin

Filter many pods with --selector or -l

kubectl get pods --selector 'env in (prod, dev)' --show-labels
kubectl get pods -l 'env in (prod, dev)' --show-labels

Let's choose only production pod

kubectl get pods --selector 'env in (prod)'
kubectl get pods -l 'env in (prod)'