Sesión 16 prometheus on kubernetes [miguel angel torres egea]

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= Sesión 16 prometheus on kubernetes
  * [[https://linuxhint.com/kubernetes_operator/]]
== google cloud
  * ''gcloud config set compute/zone europe-west1-b'' <- (https://cloud.google.com/compute/docs/regions-zones/)
  * ''gcloud container clusters create bootcamp %%--%%num-nodes 3 %%--%%scopes "https://www.googleapis.com/auth/projecthosting,storage-rw"''
  * ''gcloud container clusters list''
  * en local, con las utilidades G instaladas: ''gcloud container clusters get-credentials bootcamp %%--%%zone europe-west1-b %%--%%project <project>''
    * [[https://cloud.google.com/sdk/docs/quickstart-linux]]
  * y para eliminar después el cluster: ''gcloud container clusters delete bootcamp''

== helm
  * [[https://medium.com/google-cloud/helm-on-gke-cluster-quick-hands-on-guide-ecffad94b0]]
  * ''k apply -f create-helm-service-account.yaml''<code yaml; create-helm-service-account.yaml>
# This is an extract from here: http://jayunit100.blogspot.fi/2017/07/helm-on.html
apiVersion: v1
kind: ServiceAccount
metadata:
  name: helm
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: helm
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
  - kind: ServiceAccount
    name: helm
    namespace: kube-system
</code>
  * obtener password: ''gcloud container clusters describe bootcamp --zone europe-west1-b --<project_id>''
    * igual no necesario
  * inicializamos helm''helm init --service-account helm''
  * ''k get deploy,svc tiller-deploy -n kube-system''
    * tiller: parte servidor de helm, con la que interactuamos
  * creamos para deployar: ''helm create samplechart''
  * deployamos: ''helm install --name helm-test ./samplechart --set service.type=LoadBalancer''
  * vemos el deploy: ''k get svc''
  * comprobación de nuestro NGINX desplegado: ''curl <ip_publica>''

== prometheus
  * [[https://itnext.io/kubernetes-monitoring-with-prometheus-in-15-minutes-8e54d1de2e13]]
  * instalación a través de helm: ''helm install stable/prometheus-operator --name prometheus-operator --namespace monitoring''
  * verificamos: ''kubectl get pods -n monitoring''
  * prometheus: ''kubectl port-forward -n monitoring prometheus-prometheus-operator-prometheus-0 9090'' -> http://localhost:9090
  * grafana: ''kubectl port-forward $(kubectl get  pods --selector=app=grafana -n  monitoring --output=jsonpath="{.items..metadata.name}") -n monitoring  3000'' -> http://localhost:3000 (admin:prom-operator)
  * alertmanager: ''kubectl port-forward -n monitoring alertmanager-prometheus-operator-alertmanager-0 9093'' -> http://localhost:9093

== deploy traefik
para usar con el deploy del WHO (necesitamos la IP asignada por el uso de **nip.io**)
<code yaml; traefik.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
        - --metrics
        - --metrics.prometheus
        - --web
        - --web.metrics
        - --web.metrics.prometheus
---
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: LoadBalancer
</code>
<code yaml; rbac.yaml>
---
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
---
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
</code>

  * nos asignamos admin para poder hacer el rbac: ''kubectl create clusterrolebinding cluster-role-user --clusterrole=cluster-admin --user=<user_email_gcloud>''
  * ''k deploy -f rbac.yaml -n kube-system''
  * ''k deploy -f traefik.yaml -n kube-system''
  * ''k get svc -n kube-system'' : obtener IP pública -> [[http://<ip>:8080]] (panel admin)
    * [[http://<ip>:8080/metrics]]

== deploy WHO 
  * ''k create namespace who''
  * ''k apply -f whoami-deployment.yaml -n who''
  * ''k apply -f whoami-ingress.yaml -n who''
  * ''k apply -f whoami-service.yaml -n who''
  * ''k apply -f whoareyou.yaml -n who''
  * ''k get svc,deply -n who''

=== otro
<code yaml; otro-who.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
---
apiVersion: v1
kind: Service
metadata:
  name: whoami-service
spec:
  ports:
  - name: http
    targetPort: 80
    port: 80
  selector:
    app: whoami
---
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
</code>

== añadir ingress para grafana de prometheus
<code yaml; grafana.yaml>
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: prometheus-operator-grafana
  namespace: monitoring
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: grafana-35-187-100-153.nip.io
    http:
      paths:
      - path: /
        backend:
          serviceName: prometheus-operator-grafana
          servicePort: 80
</code>
  * ''k apply -f grafana.yaml [-n monitoring]''

== otros
  * cloudflare : anti-DDOS + CDN
  * confluence (10$ por 10 users on-premise)
  * ''docker system df''