Sesión 12 : k8s (traefik)

• traefik como ingress controller:

  traefik-rbac.yaml

  ---
  kind: ClusterRole
  apiVersion: rbac.authorization.k8s.io/v1beta1
  metadata:
    name: traefik-ingress-controller
  rules:
    - apiGroups:
        - ""
      resources:
        - services
        - endpoints
        - secrets
      verbs:
        - get
        - list
        - watch
    - apiGroups:
        - extensions
      resources:
        - ingresses
      verbs:
        - get
        - list
        - watch
  ---
  kind: ClusterRoleBinding
  apiVersion: rbac.authorization.k8s.io/v1beta1
  metadata:
    name: traefik-ingress-controller
  roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: ClusterRole
    name: traefik-ingress-controller
  subjects:
  - kind: ServiceAccount
    name: traefik-ingress-controller
    namespace: kube-system

traekik-daemonset.yaml

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: traefik-ingress-controller
  namespace: kube-system
---
kind: DaemonSet
apiVersion: extensions/v1beta1
metadata:
  name: traefik-ingress-controller
  namespace: kube-system
  labels:
    k8s-app: traefik-ingress-lb
spec:
  template:
    metadata:
      labels:
        k8s-app: traefik-ingress-lb
        name: traefik-ingress-lb
    spec:
      serviceAccountName: traefik-ingress-controller
      terminationGracePeriodSeconds: 60
      containers:
      - image: traefik
        name: traefik-ingress-lb
        ports:
        - name: http
          containerPort: 80
          hostPort: 80
        - name: admin
          containerPort: 8080
          hostPort: 8080
        securityContext:
          capabilities:
            drop:
            - ALL
            add:
            - NET_BIND_SERVICE
        args:
        - --api
        - --kubernetes
        - --logLevel=INFO
---
kind: Service
apiVersion: v1
metadata:
  name: traefik-ingress-service
  namespace: kube-system
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
    - protocol: TCP
      port: 80
      name: web
    - protocol: TCP
      port: 8080
      name: admin

esta versión no se ha desplegado correctamente VS la anterior

traefik-deployment.yaml

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: traefik-ingress-controller
  namespace: kube-system
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: traefik-ingress-controller
  namespace: kube-system
  labels:
    k8s-app: traefik-ingress-lb
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: traefik-ingress-lb
  template:
    metadata:
      labels:
        k8s-app: traefik-ingress-lb
        name: traefik-ingress-lb
    spec:
      serviceAccountName: traefik-ingress-controller
      terminationGracePeriodSeconds: 60
      containers:
      - image: traefik
        name: traefik-ingress-lb
        ports:
        - name: http
          containerPort: 80
        - name: admin
          containerPort: 8080
        args:
        - --api
        - --kubernetes
        - --logLevel=INFO
---
kind: Service
apiVersion: v1
metadata:
  name: traefik-ingress-service
  namespace: kube-system
spec:
  selector:
    k8s-app: traefik-ingress-lb
  ports:
    - protocol: TCP
      port: 80
      name: web
    - protocol: TCP
      port: 8080
      name: admin
  type: NodePort

https://medium.com/@geraldcroes/kubernetes-traefik-101-when-simplicity-matters-957eeede2cf8

whoami-deployment.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: whoami-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: whoami
  template:
    metadata:
      labels:
        app: whoami
    spec:
      containers:
      - name: whoami-container
        image: containous/whoami

whoami-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: whoami-service
spec:
  ports:
  - name: http
    targetPort: 80
    port: 80
  selector:
    app: whoami

whoami-ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: whoami-ingress
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: whoami.localhost
    http:
      paths:
      - path: /
        backend:
          serviceName: whoami-service
          servicePort: http

si queremos NO tocar el localhost para que resuelva whoami.localhost, podemos lanzar este comando: curl -H 'Host: whoami.localhost' 192.168.99.100

también podemos usar http://nip.io:

whoami-ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: whoami-ingress
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: whoami-192-168-99-100.nip.io
    http:
      paths:
      - path: /
        backend:
          serviceName: whoami-service
          servicePort: http

whoareyou-deployment.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: whoareyou-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: whoareyou
  template:
    metadata:
      labels:
        app: whoareyou
    spec:
      containers:
      - name: whoareyou-container
        image: containous/whoami
---
apiVersion: v1
kind: Service
metadata:
  name: whoareyou-service
spec:
  ports:
  - name: http
    targetPort: 80
    port: 80
  selector:
    app: whoareyou
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: whoareyou-ingress
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: whoareyou-192-168-99-100.nip.io
    http:
      paths:
      - path: /
        backend:
          serviceName: whoareyou-service
          servicePort: http

• minukube dashboard : lanza proceso dashboard web

• mysql:

  mysql-secrets.yaml

  apiVersion: v1
  kind: Secret
  metadata:
    name: mysql-secret
  type: Opaque
  data:
    password: cm9vdA==

mysql.yaml

apiVersion: v1
kind: Service
metadata:
  name: wordpress-mysql
  labels:
    app: wordpress
spec:
  ports:
    - port: 3306
  selector:
    app: wordpress
    tier: mysql
  clusterIP: None
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pv-claim
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 20Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: wordpress-mysql
  labels:
    app: wordpress
spec:
  selector:
    matchLabels:
      app: wordpress
      tier: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress
        tier: mysql
    spec:
      containers:
      - image: mysql:5.6
        name: mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: password
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pv-claim

wordpress.yaml

apiVersion: v1
kind: Service
metadata:
  name: wordpress-service
  labels:
    app: wordpress
spec:
  ports:
  - name: http
    targetPort: 80
    port: 80
# - port: 80
  selector:
    app: wordpress
    tier: frontend
#  type: LoadBalancer
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: wp-pv-claim
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 20Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: wordpress
  labels:
    app: wordpress
spec:
#  replicas: 1
  selector:
    matchLabels:
      app: wordpress
      tier: frontend
#  strategy:
#    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress
        tier: frontend
    spec:
      containers:
      - image: wordpress:4.8-apache
        name: wordpress
        env:
        - name: WORDPRESS_DB_HOST
          value: wordpress-mysql
        - name: WORDPRESS_DB_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: password
        ports:
        - containerPort: 80
          name: wordpress
        volumeMounts:
        - name: wordpress-persistent-storage
          mountPath: /var/www/html
      volumes:
      - name: wordpress-persistent-storage
        persistentVolumeClaim:
          claimName: wp-pv-claim
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: wordpress-ingress
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: wordpress-192-168-99-100.nip.io
    http:
      paths:
      - path: /
        backend:
          serviceName: wordpress-service
          servicePort: http

• kubectl edit <objeto>
• kubectl scale –replicas=3 deployment/<pod>
• kubectl autscale –min=3 –max=10 –cpu-percent=2 deplyment/<pod>
• kubectl get all –all-namespaces
• kubetel get all –namespace=<namespace>
  • lo que no se muestra:
    • kubectl get pv
    • kubectl get pvc
    • kubectl get ingresses
• kubectl api-resources

• instalación: https://flocker.readthedocs.io/en/latest/kubernetes-integration/ ← fails!
• https://github.com/linux-on-ibm-z/docs/wiki/Building-Flocker ← fails!
• https://flocker.readthedocs.io/en/latest/supported/flockercontainers.html#flocker-containers

• replicationcontroller: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/
• replicaset: https://kubernetes.io/docs/concepts/workloads/controllers/replicaset/
• deployment: https://kubernetes.io/docs/concepts/workloads/controllers/deployment/
  • rollout, concepto de log de revisiones de deployment
  • sección deployment, sección replicaset, sección pod
• daemonset: https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/
• statefulsets: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/
  • storageclassname : servicio de gestión de volúmenes
• persistentvolumes: https://kubernetes.io/docs/concepts/storage/persistent-volumes/
  • modos:
    • readWriteOnce : solo un POD puede usar ese volumen para lectura/escritura
    • readOnlyMany
    • readWriteMany
  • persistentVolumeProvisioning: https://github.com/kubernetes/examples/blob/master/staging/persistent-volume-provisioning/README.md
  • storage classes: https://kubernetes.io/docs/concepts/storage/storage-classes/
• secrets: https://kubernetes.io/docs/concepts/configuration/secret/
• labels: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/

• helm fetch <> : descarga