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‎.github/workflows/ci.yaml‎

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name: CI
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on:
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pull_request:
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branches: [main]
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push:
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branches: [main]
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v6
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- name: Set up Go
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uses: actions/setup-go@v6
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with:
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go-version-file: go.mod
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- name: Vet
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run: make vet
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- name: Test
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run: make test
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- name: Build
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run: make build
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docker:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v6
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- name: Build Docker image
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run: docker build -t node-taint-controller:ci .

‎.github/workflows/release.yaml‎

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name: Release
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on:
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push:
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tags:
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- 'v[0-9]+.[0-9]+.[0-9]+'
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env:
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REGISTRY: ghcr.io
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IMAGE_NAME: ${{ github.repository }}
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jobs:
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release:
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runs-on: ubuntu-latest
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permissions:
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contents: write
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packages: write
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steps:
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- uses: actions/checkout@v6
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- name: Set up Go
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uses: actions/setup-go@v6
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with:
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go-version-file: go.mod
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- name: Run tests
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run: go test -v ./...
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- name: Log in to GitHub Container Registry
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uses: docker/login-action@v3
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with:
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registry: ${{ env.REGISTRY }}
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Extract metadata for Docker
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id: meta
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uses: docker/metadata-action@v5
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with:
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images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
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tags: |
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type=semver,pattern={{version}}
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type=semver,pattern={{major}}.{{minor}}
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type=semver,pattern={{major}}
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- name: Build and push Docker image
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uses: docker/build-push-action@v6
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with:
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context: .
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push: true
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tags: ${{ steps.meta.outputs.tags }}
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labels: ${{ steps.meta.outputs.labels }}
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- name: Create GitHub Release
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uses: softprops/action-gh-release@v2
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with:
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generate_release_notes: true

‎.gitignore‎

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/controller
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/manifest.yaml
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/.idea

‎Dockerfile‎

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FROM golang:1.25-alpine AS builder
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WORKDIR /app
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COPY go.mod go.sum ./
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RUN go mod download
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COPY *.go ./
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RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o controller .
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FROM gcr.io/distroless/static:nonroot
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WORKDIR /
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COPY --from=builder /app/controller .
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USER 65532:65532
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ENTRYPOINT ["/controller"]

‎Makefile‎

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build:
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go build -o controller
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test:
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go test -race -v ./...
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vet:
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go vet ./...
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.PHONY: build test vet

‎README.md‎

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# node-taint-controller
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A Kubernetes controller that applies the `node.kubernetes.io/out-of-service` taint to nodes that have been `NotReady` for a specified duration.
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Useful when a node suddenly goes offline due to power outage etc. and needs to be quickly identified and removed from the cluster to prevent pods from being stuck in `Terminating` state.
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## Installation
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Images are available at `ghcr.io/dcelasun/node-taint-controller`.
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Copy the manifest and customize it to your needs:
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```sh
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$ cp manifest.example.yaml manifest.yaml
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# Edit manifest.yaml to adjust thresholds, replicas, etc.
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$ kubectl apply -f manifest.yaml
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```
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## Configuration
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```sh
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$ make build
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$ ./controller --help
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Usage of ./controller:
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-health-probe-bind-address string
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The address the probe endpoint binds to. (default ":8081")
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-kubeconfig string
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Paths to a kubeconfig. Only required if out-of-cluster.
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-leader-election-id string
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The ID of the leader election. (default "node-taint-controller.example.com")
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-metrics-bind-address string
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The address the metric endpoint binds to. (default ":8080")
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-not-ready-threshold duration
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Duration a node must be NotReady before tainting. (default 5m0s)
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-reconcile-interval duration
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How often to re-check node status. (default 30s)
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-zap-devel
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Development Mode defaults(encoder=consoleEncoder,logLevel=Debug,stackTraceLevel=Warn). Production Mode defaults(encoder=jsonEncoder,logLevel=Info,stackTraceLevel=Error)
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-zap-encoder value
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Zap log encoding (one of 'json' or 'console')
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-zap-log-level value
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Zap Level to configure the verbosity of logging. Can be one of 'debug', 'info', 'error', 'panic'or any integer value > 0 which corresponds to custom debug levels of increasing verbosity
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-zap-stacktrace-level value
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Zap Level at and above which stacktraces are captured (one of 'info', 'error', 'panic').
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-zap-time-encoding value
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Zap time encoding (one of 'epoch', 'millis', 'nano', 'iso8601', 'rfc3339' or 'rfc3339nano'). Defaults to 'epoch'.
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```

‎go.mod‎

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module github.com/dcelasun/node-taint-controller
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go 1.25.6
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require (
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k8s.io/api v0.35.0
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k8s.io/apimachinery v0.35.0
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k8s.io/client-go v0.35.0
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sigs.k8s.io/controller-runtime v0.22.4
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)
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require (
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github.com/beorn7/perks v1.0.1 // indirect
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github.com/cespare/xxhash/v2 v2.3.0 // indirect
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github.com/davecgh/go-spew v1.1.1 // indirect
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github.com/emicklei/go-restful/v3 v3.13.0 // indirect
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github.com/evanphx/json-patch/v5 v5.9.11 // indirect
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github.com/fsnotify/fsnotify v1.9.0 // indirect
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github.com/fxamacker/cbor/v2 v2.9.0 // indirect
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github.com/go-logr/logr v1.4.3 // indirect
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github.com/go-logr/zapr v1.3.0 // indirect
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github.com/go-openapi/jsonpointer v0.22.4 // indirect
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github.com/go-openapi/jsonreference v0.21.4 // indirect
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github.com/go-openapi/swag v0.25.4 // indirect
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github.com/go-openapi/swag/cmdutils v0.25.4 // indirect
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github.com/go-openapi/swag/conv v0.25.4 // indirect
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github.com/go-openapi/swag/fileutils v0.25.4 // indirect
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github.com/go-openapi/swag/jsonname v0.25.4 // indirect
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github.com/go-openapi/swag/jsonutils v0.25.4 // indirect
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github.com/go-openapi/swag/loading v0.25.4 // indirect
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github.com/go-openapi/swag/mangling v0.25.4 // indirect
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github.com/go-openapi/swag/netutils v0.25.4 // indirect
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github.com/go-openapi/swag/stringutils v0.25.4 // indirect
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github.com/go-openapi/swag/typeutils v0.25.4 // indirect
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github.com/go-openapi/swag/yamlutils v0.25.4 // indirect
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github.com/gogo/protobuf v1.3.2 // indirect
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github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
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github.com/golang/protobuf v1.5.4 // indirect
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github.com/google/btree v1.1.3 // indirect
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github.com/google/gnostic-models v0.7.1 // indirect
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github.com/google/go-cmp v0.7.0 // indirect
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github.com/google/gofuzz v1.2.0 // indirect
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github.com/google/uuid v1.6.0 // indirect
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github.com/imdario/mergo v0.3.16 // indirect
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github.com/josharian/intern v1.0.0 // indirect
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github.com/json-iterator/go v1.1.12 // indirect
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github.com/mailru/easyjson v0.9.1 // indirect
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github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
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github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
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github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
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github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
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github.com/pkg/errors v0.9.1 // indirect
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github.com/pmezard/go-difflib v1.0.0 // indirect
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github.com/prometheus/client_golang v1.23.2 // indirect
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github.com/prometheus/client_model v0.6.2 // indirect
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github.com/prometheus/common v0.67.5 // indirect
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github.com/prometheus/procfs v0.19.2 // indirect
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github.com/spf13/pflag v1.0.10 // indirect
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github.com/x448/float16 v0.8.4 // indirect
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go.uber.org/multierr v1.11.0 // indirect
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go.uber.org/zap v1.27.1 // indirect
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go.yaml.in/yaml/v2 v2.4.3 // indirect
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go.yaml.in/yaml/v3 v3.0.4 // indirect
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golang.org/x/exp v0.0.0-20260112195511-716be5621a96 // indirect
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golang.org/x/net v0.49.0 // indirect
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golang.org/x/oauth2 v0.34.0 // indirect
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golang.org/x/sync v0.19.0 // indirect
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golang.org/x/sys v0.40.0 // indirect
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golang.org/x/term v0.39.0 // indirect
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golang.org/x/text v0.33.0 // indirect
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golang.org/x/time v0.14.0 // indirect
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gomodules.xyz/jsonpatch/v2 v2.5.0 // indirect
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google.golang.org/appengine v1.6.8 // indirect
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google.golang.org/protobuf v1.36.11 // indirect
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gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
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gopkg.in/inf.v0 v0.9.1 // indirect
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gopkg.in/yaml.v2 v2.4.0 // indirect
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gopkg.in/yaml.v3 v3.0.1 // indirect
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k8s.io/apiextensions-apiserver v0.35.0 // indirect
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k8s.io/component-base v0.35.0 // indirect
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k8s.io/klog/v2 v2.130.1 // indirect
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k8s.io/kube-openapi v0.0.0-20251125145642-4e65d59e963e // indirect
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k8s.io/utils v0.0.0-20260108192941-914a6e750570 // indirect
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sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
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sigs.k8s.io/randfill v1.0.0 // indirect
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sigs.k8s.io/structured-merge-diff/v4 v4.7.0 // indirect
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sigs.k8s.io/structured-merge-diff/v6 v6.3.1 // indirect
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sigs.k8s.io/yaml v1.6.0 // indirect
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)

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