diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 00000000..50848394 --- /dev/null +++ b/.dockerignore @@ -0,0 +1,6 @@ +# More info: https://docs.docker.com/engine/reference/builder/#dockerignore-file +# Ignore build and test binaries. +bin/ +charts/ +hack/ +.vscode diff --git a/.github/renovate.json5 b/.github/renovate.json5 new file mode 100644 index 00000000..0aac0a9d --- /dev/null +++ b/.github/renovate.json5 @@ -0,0 +1,11 @@ +{ + $schema: "https://docs.renovatebot.com/renovate-schema.json", + extends: [ + "github>bjw-s/renovate-config", + "github>bjw-s/renovate-config:automerge-github-actions", + "github>bjw-s/renovate-config:automerge-docker-digest", + ], + platform: "github", + username: "bjw-s-bot[bot]", + gitAuthor: "bjw-s-bot <87358111+bjw-s-bot[bot]@users.noreply.github.com>", +} diff --git a/.github/workflows/build-app.yaml b/.github/workflows/build-app.yaml new file mode 100644 index 00000000..69dc46b5 --- /dev/null +++ b/.github/workflows/build-app.yaml @@ -0,0 +1,60 @@ +--- +name: Build and release application + +on: + push: + branches: + - "main" + - "development" + tags: + - "v*" + workflow_dispatch: + +concurrency: + group: build-and-release-app + cancel-in-progress: false + +permissions: + contents: read + packages: write + +jobs: + build_container: + runs-on: ubuntu-latest + steps: + - name: Check out code + uses: actions/checkout@v3 + + - name: Set up QEMU + uses: docker/setup-qemu-action@v2 + + - name: Set up Docker Buildx + uses: docker/setup-buildx-action@v2 + + - name: Login to image registry + uses: docker/login-action@v2 + with: + registry: ghcr.io + username: ${{ github.actor }} + password: ${{ secrets.GITHUB_TOKEN }} + + - name: Docker meta + id: meta + uses: docker/metadata-action@v4 + with: + images: | + ghcr.io/${{ github.repository_owner }}/k8s-ycl + tags: | + type=raw,value=rolling,enable=${{ github.ref == format('refs/heads/{0}', 'main') }} + type=ref,event=branch + type=ref,event=tag + + - name: Build and push + uses: docker/build-push-action@v4 + with: + context: . + file: ./Dockerfile + platforms: linux/amd64,linux/arm64 + push: true + tags: ${{ steps.meta.outputs.tags }} + labels: ${{ steps.meta.outputs.labels }} diff --git a/.github/workflows/scheduled-keepalive.yaml b/.github/workflows/scheduled-keepalive.yaml new file mode 100644 index 00000000..6ac06a58 --- /dev/null +++ b/.github/workflows/scheduled-keepalive.yaml @@ -0,0 +1,36 @@ +--- +name: Schedule - Keepalive + +on: + workflow_dispatch: + schedule: + - cron: "0 0 * * *" + push: + branches: + - main + paths: + - ".github/workflows/scheduled-keepalive.yaml" + +jobs: + keepalive: + name: Keep scheduled GitHub workflows alive + runs-on: ubuntu-latest + steps: + - name: Get GitHub API token + id: get-app-token + uses: getsentry/action-github-app-token@v2 + with: + app_id: ${{ secrets.BJWS_APP_ID }} + private_key: ${{ secrets.BJWS_APP_PRIVATE_KEY }} + + - name: Checkout main branch + uses: actions/checkout@v3 + with: + token: ${{ steps.get-app-token.outputs.token }} + + - name: Keep scheduled GitHub workflows alive + uses: gautamkrishnar/keepalive-workflow@v1 + with: + gh_token: ${{ steps.get-app-token.outputs.token }} + committer_username: "bjw-s-bot[bot]" + committer_email: "bjw-s-bot <87358111+bjw-s-bot[bot]@users.noreply.github.com>" diff --git a/.github/workflows/scheduled-renovate.yaml b/.github/workflows/scheduled-renovate.yaml new file mode 100644 index 00000000..d91b620b --- /dev/null +++ b/.github/workflows/scheduled-renovate.yaml @@ -0,0 +1,37 @@ +--- +name: Schedule - Renovate + +on: + workflow_dispatch: + inputs: + dryRun: + description: "Dry-Run" + default: false + required: false + type: boolean + logLevel: + description: "Log-Level" + default: "debug" + required: false + schedule: + - cron: "0 * * * *" + push: + branches: + - main + paths: + - ".github/renovate.json5" + - ".github/renovate/**.json" + - ".github/renovate/**.json5" + - ".github/workflows/scheduled-renovate.yaml" + +jobs: + renovate: + name: Renovate + uses: bjw-s/gh-workflows/.github/workflows/run-renovate.yaml@main + with: + configurationFile: ".github/renovate.json5" + dryRun: ${{ inputs.dryRun || 'false' }} + renovateLogLevel: ${{ inputs.logLevel || 'debug' }} + secrets: + app_id: ${{ secrets.BJWS_APP_ID }} + app_private_key: ${{ secrets.BJWS_APP_PRIVATE_KEY }} diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..c52bc68d --- /dev/null +++ b/.gitignore @@ -0,0 +1,26 @@ + +# Binaries for programs and plugins +*.exe +*.exe~ +*.dll +*.so +*.dylib +bin/* +Dockerfile.cross + +# Test binary, build with `go test -c` +*.test + +# Output of the go coverage tool, specifically when used with LiteIDE +*.out + +# Helm Chart dependencies +charts/**/charts/ + +# Test files +certs/ +hack/ + +# Kubernetes Generated files - skip generated files, except for vendored files + +!vendor/**/zz_generated.* diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml new file mode 100644 index 00000000..aff272e8 --- /dev/null +++ b/.pre-commit-config.yaml @@ -0,0 +1,41 @@ +repos: + - repo: https://github.com/pre-commit/pre-commit-hooks + rev: v4.4.0 + hooks: + - id: trailing-whitespace + - id: end-of-file-fixer + - id: fix-byte-order-marker + - id: mixed-line-ending + - id: check-added-large-files + args: [--maxkb=2048] + - id: check-merge-conflict + - id: check-executables-have-shebangs + + - repo: https://github.com/Lucas-C/pre-commit-hooks + rev: v1.5.1 + hooks: + - id: forbid-crlf + + - repo: https://github.com/sirosen/fix-smartquotes + rev: 0.2.0 + hooks: + - id: fix-smartquotes + + - repo: https://github.com/jumanjihouse/pre-commit-hooks + rev: 3.0.0 + hooks: + - id: shellcheck + language: script + args: [--severity=error] + additional_dependencies: [] + + - repo: https://github.com/dnephin/pre-commit-golang + rev: v0.5.1 + hooks: + - id: go-fmt + - id: go-vet + + - repo: https://github.com/tekwizely/pre-commit-golang + rev: v1.0.0-rc.1 + hooks: + - id: go-revive diff --git a/.vscode/launch.json b/.vscode/launch.json new file mode 100644 index 00000000..25aec539 --- /dev/null +++ b/.vscode/launch.json @@ -0,0 +1,19 @@ +{ + // Use IntelliSense to learn about possible attributes. + // Hover to view descriptions of existing attributes. + // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 + "version": "0.2.0", + "configurations": [ + { + "name": "Launch Package", + "type": "go", + "request": "launch", + "mode": "auto", + "program": "${workspaceFolder}/src", + "args": [ + "--tls-cert-dir", + "${workspaceFolder}/certs", + ] + } + ] +} diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 00000000..7cbfec80 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,33 @@ +# Build the manager binary +FROM golang:1.20 as builder +ARG TARGETOS +ARG TARGETARCH + +WORKDIR /workspace +# Copy the Go Modules manifests +COPY go.mod go.mod +COPY go.sum go.sum +# cache deps before building and copying source so that we don't need to re-download as much +# and so that source changes don't invalidate our downloaded layer +RUN go mod download + +# Copy the go source +COPY src src + +WORKDIR /workspace/src + +# Build +# the GOARCH has not a default value to allow the binary be built according to the host where the command +# was called. For example, if we call make docker-build in a local env which has the Apple Silicon M1 SO +# the docker BUILDPLATFORM arg will be linux/arm64 when for Apple x86 it will be linux/amd64. Therefore, +# by leaving it empty we can ensure that the container and binary shipped on it will have the same platform. +RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o ../manager + +# Use distroless as minimal base image to package the manager binary +# Refer to https://github.com/GoogleContainerTools/distroless for more details +FROM gcr.io/distroless/static:nonroot +WORKDIR / +COPY --from=builder /workspace/manager . +USER 65532:65532 + +ENTRYPOINT ["/manager"] diff --git a/README.md b/README.md index 5502bea7..776ffd66 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,2 @@ # k8s-ycl -Admission Controller to Yeet Kubernetes CPU limits +Admission Controller to Yeet Kubernetes CPU limits diff --git a/go.mod b/go.mod new file mode 100644 index 00000000..5b8656ff --- /dev/null +++ b/go.mod @@ -0,0 +1,68 @@ +module github.com/bjw-s/k8s-ycl + +go 1.20 + +require ( + k8s.io/api v0.27.2 + k8s.io/apimachinery v0.27.2 + k8s.io/client-go v0.27.2 + sigs.k8s.io/controller-runtime v0.15.0 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.2.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.9.0 // indirect + github.com/evanphx/json-patch/v5 v5.6.0 // indirect + github.com/fsnotify/fsnotify v1.6.0 // indirect + github.com/go-logr/logr v1.2.4 // indirect + github.com/go-logr/zapr v1.2.4 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.1 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/gnostic v0.5.7-v3refs // indirect + github.com/google/go-cmp v0.5.9 // indirect + github.com/google/gofuzz v1.1.0 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.15.1 // indirect + github.com/prometheus/client_model v0.4.0 // indirect + github.com/prometheus/common v0.42.0 // indirect + github.com/prometheus/procfs v0.9.0 // indirect + github.com/spf13/pflag v1.0.5 // indirect + go.uber.org/atomic v1.7.0 // indirect + go.uber.org/multierr v1.6.0 // indirect + go.uber.org/zap v1.24.0 // indirect + golang.org/x/net v0.10.0 // indirect + golang.org/x/oauth2 v0.5.0 // indirect + golang.org/x/sys v0.8.0 // indirect + golang.org/x/term v0.8.0 // indirect + golang.org/x/text v0.9.0 // indirect + golang.org/x/time v0.3.0 // indirect + gomodules.xyz/jsonpatch/v2 v2.3.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.30.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/apiextensions-apiserver v0.27.2 // indirect + k8s.io/component-base v0.27.2 // indirect + k8s.io/klog/v2 v2.90.1 // indirect + k8s.io/kube-openapi v0.0.0-20230501164219-8b0f38b5fd1f // indirect + k8s.io/utils v0.0.0-20230209194617-a36077c30491 // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 00000000..47fc076f --- /dev/null +++ b/go.sum @@ -0,0 +1,272 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8= +github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA= +github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= +github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44= +github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0/go.mod 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h1:G79N1coSVB93tBe7j6PhzjmR3/2VvlbKOFpnXhI9Bw4= +github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY= +github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw= +github.com/go-logr/logr v1.2.0/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ= +github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-logr/zapr v1.2.4 h1:QHVo+6stLbfJmYGkQ7uGHUCu5hnAFAj6mDe6Ea0SeOo= +github.com/go-logr/zapr v1.2.4/go.mod h1:FyHWQIzQORZ0QVE1BtVHv3cKtNLuXsbNLtpuhNapBOA= +github.com/go-openapi/jsonpointer v0.19.6 h1:eCs3fxoIi3Wh6vtgmLTOjdhSpiqphQ+DaPn38N2ZdrE= +github.com/go-openapi/jsonpointer v0.19.6/go.mod h1:osyAmYz/mB/C3I+WsTTSgw1ONzaLJoLCyoi6/zppojs= +github.com/go-openapi/jsonreference v0.20.1 h1:FBLnyygC4/IZZr893oiomc9XaghoveYTrLC1F86HID8= +github.com/go-openapi/jsonreference v0.20.1/go.mod 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h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo= +sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8= diff --git a/src/main.go b/src/main.go new file mode 100644 index 00000000..ed8b6ba2 --- /dev/null +++ b/src/main.go @@ -0,0 +1,107 @@ +/* +Copyright 2023 bjw-s. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package main + +import ( + "flag" + "fmt" + "os" + + // Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.) + // to ensure that exec-entrypoint and run can make use of them. + + corev1 "k8s.io/api/core/v1" + "k8s.io/apimachinery/pkg/runtime" + utilruntime "k8s.io/apimachinery/pkg/util/runtime" + clientgoscheme "k8s.io/client-go/kubernetes/scheme" + _ "k8s.io/client-go/plugin/pkg/client/auth" + ctrl "sigs.k8s.io/controller-runtime" + "sigs.k8s.io/controller-runtime/pkg/builder" + "sigs.k8s.io/controller-runtime/pkg/healthz" + "sigs.k8s.io/controller-runtime/pkg/log/zap" + "sigs.k8s.io/controller-runtime/pkg/manager" + //+kubebuilder:scaffold:imports +) + +var ( + scheme = runtime.NewScheme() + setupLog = ctrl.Log.WithName("setup") +) + +func init() { + utilruntime.Must(clientgoscheme.AddToScheme(scheme)) +} + +func main() { + var metricsAddr string + var probeAddr string + var certDir string + flag.StringVar(&certDir, "tls-cert-dir", "/tls", "Folder where TLS key and cert are located.") + flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.") + flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.") + opts := zap.Options{ + Development: true, + } + opts.BindFlags(flag.CommandLine) + flag.Parse() + + ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts))) + + mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{ + Scheme: scheme, + MetricsBindAddress: metricsAddr, + Port: 9443, + HealthProbeBindAddress: probeAddr, + LeaderElection: false, + CertDir: certDir, + }) + if err != nil { + setupLog.Error(err, "unable to start manager") + os.Exit(1) + } + + setupProbeEndpoints(mgr) + go setupWebhook(mgr) + + setupLog.Info("starting manager") + if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil { + setupLog.Error(err, "problem running manager") + os.Exit(1) + } +} + +func setupWebhook(mgr manager.Manager) { + // setup webhooks + setupLog.Info("registering webhook to the webhook server") + if err := builder.WebhookManagedBy(mgr). + For(&corev1.Pod{}). + WithDefaulter(&podMutator{}). + Complete(); err != nil { + setupLog.Error(err, "unable to create webhook", "webhook", "Pod") + os.Exit(1) + } +} + +func setupProbeEndpoints(mgr ctrl.Manager) { + if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil { + panic(fmt.Errorf("unable to add healthz check: %w", err)) + } + if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil { + panic(fmt.Errorf("unable to add readyz check: %w", err)) + } + setupLog.Info("added healthz and readyz check") +} diff --git a/src/pod_webhook.go b/src/pod_webhook.go new file mode 100644 index 00000000..ecedea9d --- /dev/null +++ b/src/pod_webhook.go @@ -0,0 +1,84 @@ +/* +Copyright 2023 bjw-s. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package main + +import ( + "context" + "fmt" + + corev1 "k8s.io/api/core/v1" + "k8s.io/apimachinery/pkg/runtime" + + logf "sigs.k8s.io/controller-runtime/pkg/log" +) + +type podMutator struct{} + +func (m *podMutator) Default(ctx context.Context, obj runtime.Object) error { + log := logf.Log + pod, ok := obj.(*corev1.Pod) + if !ok { + return fmt.Errorf("expected a Pod but got a %T", obj) + } + + if val, ok := pod.Annotations[KeepLimitsAnnotation]; ok { + if val == "true" { + log.Info("Skipping Pod because annotation is explicitly true", "pod", getPodName(pod)) + return nil + } + } + + for _, container := range pod.Spec.InitContainers { + if removeContainerLimits(&container, corev1.ResourceCPU) { + log.Info("Removed resource limit", "pod", pod.ObjectMeta, "container", container.Name, "limit", corev1.ResourceCPU) + } + } + + for _, container := range pod.Spec.Containers { + if removeContainerLimits(&container, corev1.ResourceCPU) { + log.Info("Removed resource limit", "pod", pod.ObjectMeta, "container", container.Name, "limit", corev1.ResourceCPU) + } + + if removeContainerLimits(&container, corev1.ResourceMemory) { + log.Info("Removed resource limit", + "namespace", pod.Namespace, + "pod", getPodName(pod), + "container", container.Name, + "limit", corev1.ResourceMemory, + ) + } + } + return nil +} + +func removeContainerLimits(container *corev1.Container, limitType corev1.ResourceName) bool { + limits := container.Resources.Limits + _, cpuLimitExists := limits[limitType] + if cpuLimitExists { + delete(limits, limitType) + return true + } + return false +} + +func getPodName(pod *corev1.Pod) string { + podName := pod.GetName() + if podName != "" { + return podName + } + return pod.GetGenerateName() +} diff --git a/src/types.go b/src/types.go new file mode 100644 index 00000000..f9b0a8e8 --- /dev/null +++ b/src/types.go @@ -0,0 +1,5 @@ +package main + +const ( + KeepLimitsAnnotation = "k8s-ycl.bjw-s.dev/keep-limit" +)