From fe023d0fd24683462e9fd543b2ef2f00a0518ce9 Mon Sep 17 00:00:00 2001 From: okozachenko Date: Thu, 2 Jul 2020 19:53:13 +0300 Subject: [PATCH] Add retry mechanism against api connection fail Change-Id: I19eb834b1b41165bab922d84983a3ad8e29b856d --- .zuul.yaml | 32 +++++++ Dockerfile | 8 ++ README.md | 25 ++++++ bindep.txt | 1 + go.mod | 20 +++++ go.sum | 229 ++++++++++++++++++++++++++++++++++++++++++++++++++ main.go | 128 ++++++++++++++++++++++++++++ manifest.yaml | 70 +++++++++++++++ 8 files changed, 513 insertions(+) create mode 100644 .zuul.yaml create mode 100644 Dockerfile create mode 100644 README.md create mode 100644 bindep.txt create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go create mode 100644 manifest.yaml diff --git a/.zuul.yaml b/.zuul.yaml new file mode 100644 index 0000000..64133a7 --- /dev/null +++ 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 diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..7a99162 --- /dev/null +++ b/Dockerfile @@ -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"] \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..b37f52a --- /dev/null +++ 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= + 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. diff --git a/bindep.txt b/bindep.txt new file mode 100644 index 0000000..90584dd --- /dev/null +++ b/bindep.txt @@ -0,0 +1 @@ +gcc diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..e9677e7 --- /dev/null +++ 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 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..65c138a --- /dev/null +++ b/go.sum @@ -0,0 +1,229 @@ +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/Azure/go-autorest v11.1.2+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24= +github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ= +github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0= +github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE= +github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= +github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM= +github.com/alecthomas/template 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v0.0.0-20190907131718-3d4f5b7dea0b/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew= +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= diff --git a/main.go b/main.go new file mode 100644 index 0000000..a25e333 --- /dev/null +++ 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 +} diff --git a/manifest.yaml b/manifest.yaml new file mode 100644 index 0000000..5687185 --- /dev/null +++ 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