feat: Create monitoring Prometheus with operator (#79)

* feat: Create monitoring Prometheus with operator

* Remove all yaml file, replace by generating script

* Remove commentary in the template and write readme

Co-authored-by: Grumbleur <remi.gaiffe@googlemail.com>
Co-authored-by: 42Atomys <contact@atomys.fr>

.github/workflows/cluster-initial-install.yaml

@@ -34,6 +34,10 @@ on:
         type: boolean
         required: true
         description: (Re)set postgres password ?
+      install_monitoring:
+        type: boolean
+        required: true
+        description: (Re)set monitoring stack ?
 jobs:
   core_install:
     runs-on: ubuntu-latest
@@ -47,6 +51,7 @@ jobs:
         method: kubeconfig
         kubeconfig: ${{ secrets.KUBECONFIG_ADMIN }}
         cluster-type: generic
+    - uses: alexdglover/jsonnet-render@v1
     - run: kubectl apply -f deploy/cluster/namespaces
       if: ${{ github.event.inputs.install_namespaces == 'true' }} 
     - run: ls -1 deploy/cluster/rbac/deployer*.yaml | xargs -l kubectl apply -f
@@ -78,6 +83,10 @@ jobs:
         kubectl apply -f deploy/cluster/cert-manager/issuers
         kubectl apply -f deploy/cluster/cert-manager/certificates
         kubectl apply -f deploy/cluster/istio/gateways
+    - name: Install Prometheus Operator
+      if: ${{ github.event.inputs.install_monitoring == 'true' }} 
+      run: |
+        cd ./deploy/cluster/monitoring && ./build.sh
 
   update_secrets:
     name: Install cross cluster secrets

deploy/cluster/monitoring/README.md

@@ -0,0 +1,9 @@
+# Monitoring
+
+[Official documentation](https://github.com/prometheus-operator/kube-prometheus/blob/main/docs/customizing.md)
+
+For deploy monitoring we need to generate json files with `jb` command.
+
+Run the script `build.sh` for json files and apply in the cluster.
+
+The script init workdir with `jb`, download some components mandatory, edit json files for scale down replicas and apply on the cluster.

deploy/cluster/monitoring/build.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+# only exit with zero if all commands of the pipeline exit successfully
+set -o pipefail
+# Make sure to use project tooling
+PATH="$(pwd)/tmp/bin:${PATH}"
+
+jb init
+jb install github.com/prometheus-operator/kube-prometheus/jsonnet/kube-prometheus@main
+
+mkdir -p manifests/setup
+
+jsonnet -J vendor -m manifests "template.jsonnet" | xargs -I{} sh -c 'mv {} {}.json' -- {}
+find manifests -type f ! -name '*.json' -delete
+rm -f kustomization
+
+sed -i -e 's/"replicas": 3/"replicas": 1/g' manifests/alertmanager-alertmanager.json
+sed -i -e 's/"replicas": 2/"replicas": 1/g' manifests/prometheus-prometheus.json
+
+kubectl apply --server-side -f manifests/setup
+kubectl apply --server-side -f manifests

deploy/cluster/monitoring/template.jsonnet

@@ -0,0 +1,20 @@
+local kp =
+  (import 'kube-prometheus/main.libsonnet') +
+  {
+    values+:: {
+      common+: {
+        namespace: 'monitoring',
+      },
+    },
+};
+
+{ 'setup/0namespace-namespace': kp.kubePrometheus.namespace } +
+{
+  ['setup/prometheus-operator-' + name]: kp.prometheusOperator[name]
+  for name in std.filter((function(name) name != 'serviceMonitor' && name != 'prometheusRule'), std.objectFields(kp.prometheusOperator))
+} +
+{ ['node-exporter-' + name]: kp.nodeExporter[name] for name in std.objectFields(kp.nodeExporter) } +
+{ ['kube-state-metrics-' + name]: kp.kubeStateMetrics[name] for name in std.objectFields(kp.kubeStateMetrics) } +
+{ ['alertmanager-' + name]: kp.alertmanager[name] for name in std.objectFields(kp.alertmanager) } +
+{ ['prometheus-' + name]: kp.prometheus[name] for name in std.objectFields(kp.prometheus) } +
+{ ['grafana-' + name]: kp.grafana[name] for name in std.objectFields(kp.grafana) }