Update current feature

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,27 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Operator Logs**
+```
+<Paste the logs here>
+<Run `kubectl logs -l name=xrootd-operator` to get the logs>
+```

.github/workflows/ci.yml

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+name: "Integration tests"
+on:
+  push:
+  pull_request:
+    branches:
+      - master
+jobs:
+  main:
+    name: Run k8s advanced exercices
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Stop apparmor
+        run: |
+          sudo /etc/init.d/apparmor stop
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '^1.19.2'
+      - name: Create k8s/kind cluster
+        run: |
+          go install github.com/k8s-school/[email protected]
+          ktbx create -c
+      - name: Install ink
+        run: |
+          go install github.com/k8s-school/[email protected]
+      - name: Install prometheus
+        run: |
+          ./install.sh

README.md

@@ -1,2 +1,51 @@
-# demo-prometheus
-Demo for prometheus installation on Kubernetes
+# Pre-requisite 
+
+An up and running k8s cluster
+
+NOTE: Successfully tested on kind-v0.6.1 (2020-01-10) and helm-v3.0.1
+
+# Ex1: Install prometheus-operator
+
+```shell
+./install.sh
+
+# Prometheus access:
+kubectl port-forward -n monitoring prometheus-prometheus-stack-kube-prom-prometheus-0 9090
+
+# Grafana access:
+# login as admin with password prom-operator
+kubectl port-forward $(kubectl get  pods --selector=app.kubernetes.io/name=grafana -n  monitoring --output=jsonpath="{.items..metadata.name}") -n monitoring  3000 &
+
+# Alertmanager UI access
+kubectl port-forward -n monitoring svc/alertmanager-operated 9093:9093 
+
+```
+
+
+
+# Ex2: Install metric-server
+
+NOTE: Successfully tested on kind-v0.6.1 (2020-01-10)
+
+Enable 'kubectl top' command and hpa.
+
+```shell
+
+# See https://github.com/kubernetes-incubator/metrics-server
+wget https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.7/components.yaml
+
+# Allow insecure tls, because of self-signed certificate
+diff -u2 components.yaml.1 components.yaml 
+--- components.yaml.1	2020-08-25 09:20:38.000000000 +0200
++++ components.yaml	2020-09-22 23:46:05.873971737 +0200
+@@ -89,4 +89,5 @@
+           - --cert-dir=/tmp
+           - --secure-port=4443
++          - --kubelet-insecure-tls
+         ports:
+         - name: main-port
+
+# Create metrics-server and wait for it to work
+kubectl apply -f components.yaml
+```
+

install.sh

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+#!/bin/bash
+
+## Install prometheus stack
+
+set -euxo pipefail
+
+DIR=$(cd "$(dirname "$0")"; pwd -P)
+
+NS="monitoring"
+
+# TODO hack, implement nicely helm delete
+helm delete prometheus-stack -n monitoring || echo "Unable to delete prometheus stack"
+
+kubectl delete ns -l name="$NS"
+kubectl create namespace "$NS"
+kubectl label ns "$NS" "name=$NS"
+
+helm repo add prometheus-community https://prometheus-community.github.io/helm-charts || echo "Unable to add repo prometheus-community"
+helm repo add stable https://charts.helm.sh/stable --force-update
+helm repo update
+helm install --version "45.27.2" prometheus-stack prometheus-community/kube-prometheus-stack -n monitoring  -f "$DIR"/values.yaml --create-namespace
+
+echo "Exercice: access prometheus-grafana and other services using the website documentation"
+echo "1. Watch all pod in monitoring namespace"
+echo "2. Retrieve grafana password using 'helm show values prometheus-community/kube-prometheus-stack'"
+echo "3. Port forward grafana and access it in a web browser"

values.yaml

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+
+## Deploy a Prometheus instance
+##
+prometheus:
+  prometheusSpec:
+    ## Prometheus StorageSpec for persistent data
+    ## ref: https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/user-guides/storage.md
+    ##
+    storageSpec:
+    ## Using PersistentVolumeClaim
+    ##
+      volumeClaimTemplate:
+        spec:
+          accessModes: ["ReadWriteOnce"]
+          resources:
+            requests:
+              storage: 50Gi
+