From f395337e2ee1eac0f428ed24714f7930eba00041 Mon Sep 17 00:00:00 2001
From: Finn <finn@finn.io>
Date: Tue, 9 Jul 2024 21:10:53 -0700
Subject: [PATCH] Add kube-prometheus

---
 .../kube-prometheus/kustomization.yaml        | 26 +++++++++++++++++++
 .../network-policies-patch.yaml               |  9 +++++++
 .../kube-prometheus/node-exporter-patch.yaml  | 19 ++++++++++++++
 3 files changed, 54 insertions(+)
 create mode 100644 k8s/operators/kube-prometheus/kustomization.yaml
 create mode 100644 k8s/operators/kube-prometheus/network-policies-patch.yaml
 create mode 100644 k8s/operators/kube-prometheus/node-exporter-patch.yaml

diff --git a/k8s/operators/kube-prometheus/kustomization.yaml b/k8s/operators/kube-prometheus/kustomization.yaml
new file mode 100644
index 0000000..ccd693d
--- /dev/null
+++ b/k8s/operators/kube-prometheus/kustomization.yaml
@@ -0,0 +1,26 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - https://github.com/prometheus-operator/kube-prometheus?ref=b5b59bc0b45508b85647eb7a84b96dc167be15f1
+patches:
+  # patch node-exporter to listen from the host on 9100 and move the internal https listener to 9101
+  - path: node-exporter-patch.yaml
+    target:
+      kind: DaemonSet
+      name: node-exporter
+  
+  # Patch network policies to allow traefik to access them
+  - path: network-policies-patch.yaml
+    target:
+      kind: NetworkPolicy
+      name: grafana
+
+  - path: network-policies-patch.yaml
+    target:
+      kind: NetworkPolicy
+      name: prometheus-k8s
+
+  - path: network-policies-patch.yaml
+    target:
+      kind: NetworkPolicy
+      name: alertmanager-main
diff --git a/k8s/operators/kube-prometheus/network-policies-patch.yaml b/k8s/operators/kube-prometheus/network-policies-patch.yaml
new file mode 100644
index 0000000..0741aa3
--- /dev/null
+++ b/k8s/operators/kube-prometheus/network-policies-patch.yaml
@@ -0,0 +1,9 @@
+- op: add
+  path: /spec/ingress/0/from/-
+  value:
+    podSelector:
+      matchLabels:
+        app.kubernetes.io/name: traefik
+    namespaceSelector:
+      matchLabels:
+        kubernetes.io/metadata.name: kube-system
diff --git a/k8s/operators/kube-prometheus/node-exporter-patch.yaml b/k8s/operators/kube-prometheus/node-exporter-patch.yaml
new file mode 100644
index 0000000..f966229
--- /dev/null
+++ b/k8s/operators/kube-prometheus/node-exporter-patch.yaml
@@ -0,0 +1,19 @@
+---
+- op: replace
+  path: "/spec/template/spec/containers/0/args/0"
+  value: "--web.listen-address=0.0.0.0:9100"
+- op: add
+  path: "/spec/template/spec/containers/0/ports"
+  value:
+  - containerPort: 9100
+    hostPort: 9100
+    name: http
+- op: replace
+  path: "/spec/template/spec/containers/1/args/0"
+  value: "--secure-listen-address=[$(IP)]:9101"
+- op: replace
+  path: "/spec/template/spec/containers/1/ports/0/containerPort"
+  value: 9101
+- op: replace
+  path: "/spec/template/spec/containers/1/ports/0/hostPort"
+  value: 9101