Enable kube-proxy metrics and allow Prometheus scrapes

* Configure kube-proxy --metrics-bind-address=0.0.0.0 (default
127.0.0.1) to serve metrics on 0.0.0.0:10249
* Add firewall rules to allow Prometheus (resides on a worker) to
scrape kube-proxy service endpoints on controllers or workers
* Add a clusterIP: None service for kube-proxy endpoint discovery

CHANGES.md

@@ -8,10 +8,13 @@ Notable changes between versions.
 * Update Calico from v3.10.2 to v3.11.1 ([#604](https://github.com/poseidon/typhoon/pull/604))
 * Inline Kubelet service on Container Linux nodes ([#606](https://github.com/poseidon/typhoon/pull/606))
 * Disable unused Kubelet `127.0.0.1:10248` healthz listener ([#607](https://github.com/poseidon/typhoon/pull/607))
+* Enable kube-proxy metrics and allow Prometheus scrapes
+  * Allow TCP/10249 traffic with worker node sources
 
 #### Addons
 
 * Update Prometheus from v2.14.0 to [v2.15.1](https://github.com/prometheus/prometheus/releases/tag/v2.15.1)
+  * Add discovery for kube-proxy service endpoints
 * Update kube-state-metrics from v1.8.0 to v1.9.0
 * Update Grafana from v6.5.1 to v6.5.2
 

addons/prometheus/discovery/kube-controller-manager.yaml

@@ -1,3 +1,4 @@
+# Allow Prometheus to scrape service endpoints
 apiVersion: v1
 kind: Service
 metadata:
@@ -7,7 +8,6 @@ metadata:
     prometheus.io/scrape: 'true'
 spec:
   type: ClusterIP
-  # service is created to allow prometheus to scrape endpoints
   clusterIP: None
   selector:
     k8s-app: kube-controller-manager

addons/prometheus/discovery/kube-proxy.yaml

@@ -0,0 +1,19 @@
+# Allow Prometheus to scrape service endpoints
+apiVersion: v1
+kind: Service
+metadata:
+  name: kube-proxy
+  namespace: kube-system
+  annotations:
+    prometheus.io/scrape: 'true'
+    prometheus.io/port: '10249'
+spec:
+  type: ClusterIP
+  clusterIP: None
+  selector:
+    k8s-app: kube-proxy
+  ports:
+    - name: metrics
+      protocol: TCP
+      port: 10249
+      targetPort: 10249

addons/prometheus/discovery/kube-scheduler.yaml

@@ -1,3 +1,4 @@
+# Allow Prometheus to scrape service endpoints
 apiVersion: v1
 kind: Service
 metadata:
@@ -7,7 +8,6 @@ metadata:
     prometheus.io/scrape: 'true'
 spec:
   type: ClusterIP
-  # service is created to allow prometheus to scrape endpoints
   clusterIP: None
   selector:
     k8s-app: kube-scheduler

aws/container-linux/kubernetes/bootstrap.tf

@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=c8c21deb7682c2a83a1b86ff6ed88f3e5a20262d"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=ac4b7af57012d477cd53bd74ce632ac581e807e1"
 
   cluster_name          = var.cluster_name
   api_servers           = [format("%s.%s", var.cluster_name, var.dns_zone)]

aws/container-linux/kubernetes/security.tf

@@ -33,6 +33,28 @@ resource "aws_security_group_rule" "controller-etcd" {
   self      = true
 }
 
+# Allow Prometheus to scrape etcd metrics
+resource "aws_security_group_rule" "controller-etcd-metrics" {
+  security_group_id = aws_security_group.controller.id
+
+  type                     = "ingress"
+  protocol                 = "tcp"
+  from_port                = 2381
+  to_port                  = 2381
+  source_security_group_id = aws_security_group.worker.id
+}
+
+# Allow Prometheus to scrape kube-proxy
+resource "aws_security_group_rule" "kube-proxy-metrics" {
+  security_group_id = aws_security_group.controller.id
+
+  type                     = "ingress"
+  protocol                 = "tcp"
+  from_port                = 10249
+  to_port                  = 10249
+  source_security_group_id = aws_security_group.worker.id
+}
+
 # Allow Prometheus to scrape kube-scheduler
 resource "aws_security_group_rule" "controller-scheduler-metrics" {
   security_group_id = aws_security_group.controller.id
@@ -55,17 +77,6 @@ resource "aws_security_group_rule" "controller-manager-metrics" {
   source_security_group_id = aws_security_group.worker.id
 }
 
-# Allow Prometheus to scrape etcd metrics
-resource "aws_security_group_rule" "controller-etcd-metrics" {
-  security_group_id = aws_security_group.controller.id
-
-  type                     = "ingress"
-  protocol                 = "tcp"
-  from_port                = 2381
-  to_port                  = 2381
-  source_security_group_id = aws_security_group.worker.id
-}
-
 resource "aws_security_group_rule" "controller-vxlan" {
   count = var.networking == "flannel" ? 1 : 0
 
@@ -281,14 +292,15 @@ resource "aws_security_group_rule" "worker-node-exporter" {
   self      = true
 }
 
-resource "aws_security_group_rule" "ingress-health" {
+# Allow Prometheus to scrape kube-proxy
+resource "aws_security_group_rule" "worker-kube-proxy" {
   security_group_id = aws_security_group.worker.id
 
-  type        = "ingress"
+  type      = "ingress"
-  protocol    = "tcp"
+  protocol  = "tcp"
-  from_port   = 10254
+  from_port = 10249
-  to_port     = 10254
+  to_port   = 10249
-  cidr_blocks = ["0.0.0.0/0"]
+  self      = true
 }
 
 # Allow apiserver to access kubelets for exec, log, port-forward
@@ -313,6 +325,16 @@ resource "aws_security_group_rule" "worker-kubelet-self" {
   self      = true
 }
 
+resource "aws_security_group_rule" "ingress-health" {
+  security_group_id = aws_security_group.worker.id
+
+  type        = "ingress"
+  protocol    = "tcp"
+  from_port   = 10254
+  to_port     = 10254
+  cidr_blocks = ["0.0.0.0/0"]
+}
+
 resource "aws_security_group_rule" "worker-bgp" {
   security_group_id = aws_security_group.worker.id
 

aws/fedora-coreos/kubernetes/bootstrap.tf

@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=c8c21deb7682c2a83a1b86ff6ed88f3e5a20262d"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=ac4b7af57012d477cd53bd74ce632ac581e807e1"
 
   cluster_name          = var.cluster_name
   api_servers           = [format("%s.%s", var.cluster_name, var.dns_zone)]

aws/fedora-coreos/kubernetes/security.tf

@@ -44,6 +44,17 @@ resource "aws_security_group_rule" "controller-etcd-metrics" {
   source_security_group_id = aws_security_group.worker.id
 }
 
+# Allow Prometheus to scrape kube-proxy
+resource "aws_security_group_rule" "kube-proxy-metrics" {
+  security_group_id = aws_security_group.controller.id
+
+  type                     = "ingress"
+  protocol                 = "tcp"
+  from_port                = 10249
+  to_port                  = 10249
+  source_security_group_id = aws_security_group.worker.id
+}
+
 # Allow Prometheus to scrape kube-scheduler
 resource "aws_security_group_rule" "controller-scheduler-metrics" {
   security_group_id = aws_security_group.controller.id
@@ -281,14 +292,15 @@ resource "aws_security_group_rule" "worker-node-exporter" {
   self      = true
 }
 
-resource "aws_security_group_rule" "ingress-health" {
+# Allow Prometheus to scrape kube-proxy
+resource "aws_security_group_rule" "worker-kube-proxy" {
   security_group_id = aws_security_group.worker.id
 
-  type        = "ingress"
+  type      = "ingress"
-  protocol    = "tcp"
+  protocol  = "tcp"
-  from_port   = 10254
+  from_port = 10249
-  to_port     = 10254
+  to_port   = 10249
-  cidr_blocks = ["0.0.0.0/0"]
+  self      = true
 }
 
 # Allow apiserver to access kubelets for exec, log, port-forward
@@ -313,6 +325,16 @@ resource "aws_security_group_rule" "worker-kubelet-self" {
   self      = true
 }
 
+resource "aws_security_group_rule" "ingress-health" {
+  security_group_id = aws_security_group.worker.id
+
+  type        = "ingress"
+  protocol    = "tcp"
+  from_port   = 10254
+  to_port     = 10254
+  cidr_blocks = ["0.0.0.0/0"]
+}
+
 resource "aws_security_group_rule" "worker-bgp" {
   security_group_id = aws_security_group.worker.id
 

azure/container-linux/kubernetes/bootstrap.tf

@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=c8c21deb7682c2a83a1b86ff6ed88f3e5a20262d"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=ac4b7af57012d477cd53bd74ce632ac581e807e1"
 
   cluster_name = var.cluster_name
   api_servers  = [format("%s.%s", var.cluster_name, var.dns_zone)]

azure/container-linux/kubernetes/security.tf

@@ -53,13 +53,29 @@ resource "azurerm_network_security_rule" "controller-etcd-metrics" {
   destination_address_prefix  = azurerm_subnet.controller.address_prefix
 }
 
+# Allow Prometheus to scrape kube-proxy metrics
+resource "azurerm_network_security_rule" "controller-kube-proxy" {
+  resource_group_name = azurerm_resource_group.cluster.name
+
+  name                        = "allow-kube-proxy-metrics"
+  network_security_group_name = azurerm_network_security_group.controller.name
+  priority                    = "2011"
+  access                      = "Allow"
+  direction                   = "Inbound"
+  protocol                    = "Tcp"
+  source_port_range           = "*"
+  destination_port_range      = "10249"
+  source_address_prefix       = azurerm_subnet.worker.address_prefix
+  destination_address_prefix  = azurerm_subnet.controller.address_prefix
+}
+
 # Allow Prometheus to scrape kube-scheduler and kube-controller-manager metrics
 resource "azurerm_network_security_rule" "controller-kube-metrics" {
   resource_group_name = azurerm_resource_group.cluster.name
 
   name                        = "allow-kube-metrics"
   network_security_group_name = azurerm_network_security_group.controller.name
-  priority                    = "2011"
+  priority                    = "2012"
   access                      = "Allow"
   direction                   = "Inbound"
   protocol                    = "Tcp"
@@ -251,6 +267,22 @@ resource "azurerm_network_security_rule" "worker-node-exporter" {
   destination_address_prefix  = azurerm_subnet.worker.address_prefix
 }
 
+# Allow Prometheus to scrape kube-proxy
+resource "azurerm_network_security_rule" "worker-kube-proxy" {
+  resource_group_name = azurerm_resource_group.cluster.name
+
+  name                        = "allow-kube-proxy"
+  network_security_group_name = azurerm_network_security_group.worker.name
+  priority                    = "2024"
+  access                      = "Allow"
+  direction                   = "Inbound"
+  protocol                    = "Tcp"
+  source_port_range           = "*"
+  destination_port_range      = "10249"
+  source_address_prefix       = azurerm_subnet.worker.address_prefix
+  destination_address_prefix  = azurerm_subnet.worker.address_prefix
+}
+
 # Allow apiserver to access kubelet's for exec, log, port-forward
 resource "azurerm_network_security_rule" "worker-kubelet" {
   resource_group_name = azurerm_resource_group.cluster.name

bare-metal/container-linux/kubernetes/bootstrap.tf

@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=c8c21deb7682c2a83a1b86ff6ed88f3e5a20262d"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=ac4b7af57012d477cd53bd74ce632ac581e807e1"
 
   cluster_name                    = var.cluster_name
   api_servers                     = [var.k8s_domain_name]

bare-metal/fedora-coreos/kubernetes/bootstrap.tf

@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=c8c21deb7682c2a83a1b86ff6ed88f3e5a20262d"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=ac4b7af57012d477cd53bd74ce632ac581e807e1"
 
   cluster_name                    = var.cluster_name
   api_servers                     = [var.k8s_domain_name]

digital-ocean/container-linux/kubernetes/bootstrap.tf

@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=c8c21deb7682c2a83a1b86ff6ed88f3e5a20262d"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=ac4b7af57012d477cd53bd74ce632ac581e807e1"
 
   cluster_name = var.cluster_name
   api_servers  = [format("%s.%s", var.cluster_name, var.dns_zone)]

digital-ocean/container-linux/kubernetes/network.tf

@@ -16,12 +16,20 @@ resource "digitalocean_firewall" "rules" {
     source_tags = [digitalocean_tag.controllers.name, digitalocean_tag.workers.name]
   }
 
+  # Allow Prometheus to scrape node-exporter
   inbound_rule {
     protocol    = "tcp"
     port_range  = "9100"
     source_tags = [digitalocean_tag.workers.name]
   }
 
+  # Allow Prometheus to scrape kube-proxy
+  inbound_rule {
+    protocol    = "tcp"
+    port_range  = "10249"
+    source_tags = [digitalocean_tag.workers.name]
+  }
+
   inbound_rule {
     protocol    = "tcp"
     port_range  = "10250"

google-cloud/container-linux/kubernetes/bootstrap.tf

@@ -1,6 +1,6 @@
 # Kubernetes assets (kubeconfig, manifests)
 module "bootstrap" {
-  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=c8c21deb7682c2a83a1b86ff6ed88f3e5a20262d"
+  source = "git::https://github.com/poseidon/terraform-render-bootstrap.git?ref=ac4b7af57012d477cd53bd74ce632ac581e807e1"
 
   cluster_name          = var.cluster_name
   api_servers           = [format("%s.%s", var.cluster_name, var.dns_zone)]

google-cloud/container-linux/kubernetes/network.tf

@@ -126,6 +126,20 @@ resource "google_compute_firewall" "internal-node-exporter" {
   target_tags = ["${var.cluster_name}-controller", "${var.cluster_name}-worker"]
 }
 
+# Allow Prometheus to scrape kube-proxy metrics
+resource "google_compute_firewall" "internal-kube-proxy" {
+  name    = "${var.cluster_name}-internal-kube-proxy"
+  network = google_compute_network.network.name
+
+  allow {
+    protocol = "tcp"
+    ports    = [10249]
+  }
+
+  source_tags = ["${var.cluster_name}-worker"]
+  target_tags = ["${var.cluster_name}-controller", "${var.cluster_name}-worker"]
+}
+
 # Allow apiserver to access kubelets for exec, log, port-forward
 resource "google_compute_firewall" "internal-kubelet" {
   name    = "${var.cluster_name}-internal-kubelet"