Pregunta 11 - DaemonSet en Todos los Nodos

Question 11 | DaemonSet on all Nodes

Use context: kubectl config use-context k8s-c1-H

Use Namespace project-tiger for the following. Create a DaemonSet named ds-important with image httpd:2.4-alpine and labels id=ds-important and uuid=18426a0b-5f59-4e10-923f-c0e078e82462. The Pods it creates should request 10 millicore cpu and 10 mebibyte memory. The Pods of that DaemonSet should run on all nodes, also controlplanes.

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# Daemonset no tiene plantilla, pero podemos usar la del deployment. No es posible pasar las labels a un deploy, es necesario colocarlas manualmente.
k create deployment -n project-tiger  --image=httpd:2.4-alpine ds-important --dry-run=client -o yaml > /opt/course/11/daemonset.yaml
vim /opt/course/11/daemonset.yaml

#/opt/course/11/daemonset.yaml
apiVersion: apps/v1
kind: DaemonSet                                     # cambiar de Deployment a Daemonset
metadata:
  creationTimestamp: null
  labels:
  # app: ds-important                               # remover
    id: ds-important                                # agregar
    uuid: 18426a0b-5f59-4e10-923f-c0e078e82462      # agregar
  name: ds-important
  namespace: project-tiger                          # importante
spec:
  #replicas: 1                                      # remover
  selector:
    matchLabels:
    # app: ds-important                             # remover
      id: ds-important                              # agregar
      uuid: 18426a0b-5f59-4e10-923f-c0e078e82462    # agregar
  #strategy: {}                                     # remover
  template:
    metadata:
      creationTimestamp: null
      labels:
      # app: ds-important                           # remover
        id: ds-important                            # agregar
        uuid: 18426a0b-5f59-4e10-923f-c0e078e82462  # agregar
    spec:
      containers:
      - image: httpd:2.4-alpine
        name: ds-important
        resources:
          requests:                                 # agregar
            cpu: 10m                                # agregar
            memory: 10Mi                            # agregar
# Si va a incluir en el control-plane necesita la toleration para el taint que tiene
      tolerations:                                  # agregar
      - effect: NoSchedule                          # agregar
        key: node-role.kubernetes.io/control-plane  # agregar
status: {}                                         # remover

kubectl apply -f /opt/course/11/daemonset.yaml

# Para verificar si fue a todos los nodos
k get pod -n project-tiger -l id=ds-important -o wide
NAME                      READY   STATUS          NODE
ds-important-6pvgm        1/1     Running   ...   cluster1-node1
ds-important-lh5ts        1/1     Running   ...   cluster1-controlplane1
ds-important-qhjcq        1/1     Running   ...   cluster1-node2

# o
k get pod -n project-tiger -o wide | grep ds-important