Add retry mechanism against api connection fail

Change-Id: I19eb834b1b41165bab922d84983a3ad8e29b856d
2020-07-02 19:53:13 +03:00 · 2020-07-02 19:53:13 +03:00 · fe023d0fd2
parent 17a04b3519
commit fe023d0fd2
8 changed files with 513 additions and 0 deletions
--- a/.zuul.yaml
+++ b/.zuul.yaml
@ -0,0 +1,32 @@
+- job:
+    name: node-labeler:image:build
+    parent: vexxhost-build-docker-image
+    provides: node-labeler:images
+    vars: &node_labeler_images
+      docker_images:
+        - context: .
+          repository: vexxhost/node-labeler
+
+- job:
+    name: node-labeler:image:upload
+    parent: vexxhost-upload-docker-image
+    provides: node-labeler:images
+    vars: *node_labeler_images
+
+- job:
+    name: node-labeler:image:promote
+    parent: vexxhost-promote-docker-image
+    vars: *node_labeler_images
+
+- project:
+    templates:
+      - golang-jobs
+    check:
+      jobs:
+        - node-labeler:image:build
+    gate:
+      jobs:
+        - node-labeler:image:upload
+    promote:
+      jobs:
+        - node-labeler:image:promote
--- a/8
+++ b/8
@ -0,0 +1,8 @@
+FROM golang:1.13 AS builder
+WORKDIR /go/src/app
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build
+
+FROM scratch
+COPY --from=builder /go/src/app/node-labeler /node-labeler
+ENTRYPOINT ["/node-labeler"]
--- a/README.md
+++ b/README.md
@ -0,0 +1,25 @@
+# Node labeler
+
+![Zuul](https://zuul-ci.org/gated.svg)
+
+This is a very small tool that can run as a DaemonSet inside your
+Kubernetes cluster which will automatically label your nodes based
+on the product and vendor.  This can help with things like running
+specific monitoring tools on specific hardware.
+
+This is an example of labeled Dell PowerEdge machine:
+
+    Labels:             beta.kubernetes.io/arch=amd64
+                        beta.kubernetes.io/os=linux
+                        kubernetes.io/arch=amd64
+                        kubernetes.io/hostname=<snip>
+                        kubernetes.io/os=linux
+                        node-role.kubernetes.io/master=
+                        node.vexxhost.com/product=poweredge-r640
+                        node.vexxhost.com/vendor=dell-inc
+
+In addition, we provide a very simple manifest attached inside this
+repository which helps you setup a service account that is locked
+down to only `GET` and `PATCH` nodes in the Kubernetes API with the
+code for a DaemonSet.   It shouldn't require any changes to get going
+on your cluster.
--- a/bindep.txt
+++ b/bindep.txt
@ -0,0 +1 @@
+gcc
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,20 @@
+module github.com/vexxhost/node-labeler
+
+go 1.13
+
+require (
+	github.com/evanphx/json-patch v4.5.0+incompatible
+	github.com/googleapis/gnostic v0.3.1 // indirect
+	github.com/gosimple/slug v1.7.0
+	github.com/jaypipes/ghw v0.5.0
+	github.com/prometheus/common v0.7.0
+	github.com/rainycape/unidecode v0.0.0-20150907023854-cb7f23ec59be // indirect
+	go.uber.org/atomic v1.4.0 // indirect
+	go.uber.org/multierr v1.1.0 // indirect
+	go.uber.org/zap v1.10.0
+	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
+	k8s.io/api v0.0.0-20190905160310-fb749d2f1064
+	k8s.io/apimachinery v0.0.0-20190831074630-461753078381
+	k8s.io/client-go v0.0.0-20190620085101-78d2af792bab
+	k8s.io/utils v0.0.0-20190907131718-3d4f5b7dea0b // indirect
+)
--- a/go.sum
+++ b/go.sum
@ -0,0 +1,229 @@
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+sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
+sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
--- a/main.go
+++ b/main.go
@ -0,0 +1,128 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+	"time"
+
+	"github.com/avast/retry-go"
+	jsonpatch "github.com/evanphx/json-patch"
+	"github.com/gosimple/slug"
+	"github.com/jaypipes/ghw"
+	"github.com/prometheus/common/log"
+	"go.uber.org/zap"
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+)
+
+func main() {
+	// NOTE(mnaser): Due to the fact that we don't want to run ghw in
+	//               a privileged context, we simply disable all warnings.
+	os.Setenv("GHW_DISABLE_WARNINGS", "1")
+
+	logger, _ := zap.NewProduction()
+	log := logger.Named("node-labeler")
+
+	nodeName, ok := os.LookupEnv("NODE")
+	if !ok {
+		log.Fatal("Environment variable is not defined",
+			zap.String("var", "NODE"),
+		)
+	}
+
+	log.Info("Starting service",
+		zap.String("node", nodeName),
+	)
+
+	config, err := rest.InClusterConfig()
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+
+	clientset, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+
+	for {
+		chassis, err := ghw.Chassis()
+		if err != nil {
+			log.Fatal(err.Error())
+		}
+
+		product, err := ghw.Product()
+		if err != nil {
+			log.Fatal(err.Error())
+		}
+
+		labels := map[string]string{
+			"node.vexxhost.com/vendor":  slug.Make(chassis.Vendor),
+			"node.vexxhost.com/product": slug.Make(product.Name),
+		}
+
+		var node *v1.Node
+		err = retry.Do(
+			func() error {
+				node, err = clientset.CoreV1().Nodes().Get(nodeName, metav1.GetOptions{})
+				return err
+			},
+		)
+
+		if err != nil {
+			log.Fatal(err.Error())
+		}
+
+		for label, value := range labels {
+			err = addLabelToNode(clientset, node, label, value)
+			if err != nil {
+				log.Fatal(err.Error())
+			}
+		}
+
+		time.Sleep(600 * time.Second)
+	}
+}
+
+func addLabelToNode(clientset *kubernetes.Clientset, node *v1.Node, key string, value string) error {
+	log.Info("Applying node label",
+		zap.String(key, value),
+	)
+
+	originalNode, err := json.Marshal(node)
+	if err != nil {
+		return err
+	}
+
+	node.ObjectMeta.Labels[key] = value
+
+	newNode, err := json.Marshal(node)
+	if err != nil {
+		return err
+	}
+
+	patch, err := jsonpatch.CreateMergePatch(originalNode, newNode)
+	if err != nil {
+		return err
+	}
+
+	log.Info("Patching Node resource",
+		zap.String("node", node.ObjectMeta.Name),
+		zap.String("patch", string(patch)),
+	)
+
+	err = retry.Do(
+		func() error {
+			_, err = clientset.CoreV1().Nodes().Patch(node.Name, types.MergePatchType, patch)
+			return err
+		},
+	)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
--- a/manifest.yaml
+++ b/manifest.yaml
@ -0,0 +1,70 @@
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: node-labeler
+  namespace: monitoring
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: node-labeler
+rules:
+  - apiGroups:
+      - ""
+    resources:
+      - nodes
+    verbs:
+      - get
+      - patch
+---
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1beta1
+metadata:
+  name: node-labeler
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: node-labeler
+subjects:
+- kind: ServiceAccount
+  name: node-labeler
+  namespace: monitoring
+---
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: node-labeler
+  namespace: monitoring
+  labels:
+    tier: node
+    app: node-labeler
+spec:
+  selector:
+    matchLabels:
+      app: node-labeler
+  template:
+    metadata:
+      labels:
+        tier: node
+        app: node-labeler
+    spec:
+      tolerations:
+      - operator: Exists
+        effect: NoSchedule
+      serviceAccountName: node-labeler
+      containers:
+      - name: node-labeler
+        image: vexxhost/node-labeler:latest
+        resources:
+          requests:
+            cpu: "100m"
+            memory: "50Mi"
+          limits:
+            cpu: "100m"
+            memory: "50Mi"
+        env:
+        - name: NODE
+          valueFrom:
+            fieldRef:
+              fieldPath: spec.nodeName