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‎.dockerignore‎

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# More info: https://docs.docker.com/engine/reference/builder/#dockerignore-file
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# Ignore build and test binaries.
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bin/
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testbin/

‎.gitignore‎

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# Binaries for programs and plugins
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*.exe
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*.exe~
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*.dll
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*.so
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*.dylib
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bin
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testbin/*
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# Test binary, build with `go test -c`
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*.test
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# Output of the go coverage tool, specifically when used with LiteIDE
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*.out
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# Kubernetes Generated files - skip generated files, except for vendored files
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!vendor/**/zz_generated.*
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# editor and IDE paraphernalia
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.idea
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*.swp
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*.swo
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*~

‎Dockerfile‎

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# Build the manager binary
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FROM golang:1.16 as builder
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WORKDIR /workspace
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# Copy the Go Modules manifests
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COPY go.mod go.mod
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COPY go.sum go.sum
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# cache deps before building and copying source so that we don't need to re-download as much
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# and so that source changes don't invalidate our downloaded layer
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RUN go mod download
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# Copy the go source
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COPY main.go main.go
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COPY api/ api/
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COPY controllers/ controllers/
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# Build
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RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o manager main.go
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# Use distroless as minimal base image to package the manager binary
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# Refer to https://github.com/GoogleContainerTools/distroless for more details
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FROM gcr.io/distroless/static:nonroot
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WORKDIR /
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COPY --from=builder /workspace/manager .
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USER 65532:65532
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ENTRYPOINT ["/manager"]

‎Makefile‎

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# Image URL to use all building/pushing image targets
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IMG ?= controller:latest
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# ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary.
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ENVTEST_K8S_VERSION = 1.22
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# Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
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ifeq (,$(shell go env GOBIN))
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GOBIN=$(shell go env GOPATH)/bin
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else
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GOBIN=$(shell go env GOBIN)
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endif
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# Setting SHELL to bash allows bash commands to be executed by recipes.
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# This is a requirement for 'setup-envtest.sh' in the test target.
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# Options are set to exit when a recipe line exits non-zero or a piped command fails.
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SHELL = /usr/bin/env bash -o pipefail
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.SHELLFLAGS = -ec
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.PHONY: all
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all: build
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##@ General
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# The help target prints out all targets with their descriptions organized
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# beneath their categories. The categories are represented by '##@' and the
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# target descriptions by '##'. The awk commands is responsible for reading the
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# entire set of makefiles included in this invocation, looking for lines of the
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# file as xyz: ## something, and then pretty-format the target and help. Then,
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# if there's a line with ##@ something, that gets pretty-printed as a category.
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# More info on the usage of ANSI control characters for terminal formatting:
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# https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_parameters
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# More info on the awk command:
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# http://linuxcommand.org/lc3_adv_awk.php
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.PHONY: help
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help: ## Display this help.
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@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n make \033[36m<target>\033[0m\n"} /^[a-zA-Z_0-9-]+:.*?##/ { printf " \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)
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##@ Development
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.PHONY: manifests
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manifests: controller-gen ## Generate WebhookConfiguration, ClusterRole and CustomResourceDefinition objects.
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$(CONTROLLER_GEN) rbac:roleName=manager-role crd webhook paths="./..." output:crd:artifacts:config=config/crd/bases
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.PHONY: generate
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generate: controller-gen ## Generate code containing DeepCopy, DeepCopyInto, and DeepCopyObject method implementations.
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$(CONTROLLER_GEN) object:headerFile="hack/boilerplate.go.txt" paths="./..."
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.PHONY: fmt
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fmt: ## Run go fmt against code.
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go fmt ./...
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.PHONY: vet
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vet: ## Run go vet against code.
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go vet ./...
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.PHONY: test
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test: manifests generate fmt vet envtest ## Run tests.
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KUBEBUILDER_ASSETS="$(shell $(ENVTEST) use $(ENVTEST_K8S_VERSION) -p path)" go test ./... -coverprofile cover.out
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##@ Build
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.PHONY: build
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build: generate fmt vet ## Build manager binary.
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go build -o bin/manager main.go
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.PHONY: run
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run: manifests generate fmt vet ## Run a controller from your host.
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go run ./main.go
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.PHONY: docker-build
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docker-build: test ## Build docker image with the manager.
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docker build -t ${IMG} .
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.PHONY: docker-push
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docker-push: ## Push docker image with the manager.
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docker push ${IMG}
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##@ Deployment
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ifndef ignore-not-found
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ignore-not-found = false
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endif
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.PHONY: install
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install: manifests kustomize ## Install CRDs into the K8s cluster specified in ~/.kube/config.
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$(KUSTOMIZE) build config/crd | kubectl apply -f -
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.PHONY: uninstall
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uninstall: manifests kustomize ## Uninstall CRDs from the K8s cluster specified in ~/.kube/config. Call with ignore-not-found=true to ignore resource not found errors during deletion.
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$(KUSTOMIZE) build config/crd | kubectl delete --ignore-not-found=$(ignore-not-found) -f -
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.PHONY: deploy
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deploy: manifests kustomize ## Deploy controller to the K8s cluster specified in ~/.kube/config.
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cd config/manager && $(KUSTOMIZE) edit set image controller=${IMG}
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$(KUSTOMIZE) build config/default | kubectl apply -f -
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.PHONY: undeploy
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undeploy: ## Undeploy controller from the K8s cluster specified in ~/.kube/config. Call with ignore-not-found=true to ignore resource not found errors during deletion.
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$(KUSTOMIZE) build config/default | kubectl delete --ignore-not-found=$(ignore-not-found) -f -
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CONTROLLER_GEN = $(shell pwd)/bin/controller-gen
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.PHONY: controller-gen
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controller-gen: ## Download controller-gen locally if necessary.
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$(call go-get-tool,$(CONTROLLER_GEN),sigs.k8s.io/controller-tools/cmd/controller-gen@v0.7.0)
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KUSTOMIZE = $(shell pwd)/bin/kustomize
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.PHONY: kustomize
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kustomize: ## Download kustomize locally if necessary.
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$(call go-get-tool,$(KUSTOMIZE),sigs.k8s.io/kustomize/kustomize/v3@v3.8.7)
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ENVTEST = $(shell pwd)/bin/setup-envtest
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.PHONY: envtest
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envtest: ## Download envtest-setup locally if necessary.
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$(call go-get-tool,$(ENVTEST),sigs.k8s.io/controller-runtime/tools/setup-envtest@latest)
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# go-get-tool will 'go get' any package $2 and install it to $1.
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PROJECT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))
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define go-get-tool
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@[ -f $(1) ] || { \
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set -e ;\
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TMP_DIR=$$(mktemp -d) ;\
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cd $$TMP_DIR ;\
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go mod init tmp ;\
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echo "Downloading $(2)" ;\
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GOBIN=$(PROJECT_DIR)/bin go get $(2) ;\
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rm -rf $$TMP_DIR ;\
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}
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endef

‎PROJECT‎

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domain: elx.cloud
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layout:
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- go.kubebuilder.io/v3
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projectName: elx-nodegroup-controller
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repo: github.com/elastx/elx-nodegroup-controller
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resources:
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- api:
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crdVersion: v1
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controller: true
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domain: elx.cloud
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group: k8s
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kind: NodeGroup
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path: github.com/elastx/elx-nodegroup-controller/api/v1alpha1
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version: v1alpha1
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version: "3"

‎README.md‎

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# elx-nodegroup-controller
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A tiny controller for persisting labels and taints on a list of nodes.
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## NodeGroup
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The NodeGroup schema can be found in `api/v1alpha/nogroup_types.go`.

‎api/v1alpha1/groupversion_info.go‎

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/*
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Copyright 2022.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package v1alpha1 contains API Schema definitions for the k8s v1alpha1 API group
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//+kubebuilder:object:generate=true
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//+groupName=k8s.elx.cloud
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package v1alpha1
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import (
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"k8s.io/apimachinery/pkg/runtime/schema"
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"sigs.k8s.io/controller-runtime/pkg/scheme"
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)
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var (
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// GroupVersion is group version used to register these objects
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GroupVersion = schema.GroupVersion{Group: "k8s.elx.cloud", Version: "v1alpha1"}
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// SchemeBuilder is used to add go types to the GroupVersionKind scheme
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SchemeBuilder = &scheme.Builder{GroupVersion: GroupVersion}
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// AddToScheme adds the types in this group-version to the given scheme.
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AddToScheme = SchemeBuilder.AddToScheme
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)

‎api/v1alpha1/nodegroup_types.go‎

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/*
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Copyright 2022.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package v1alpha1
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import (
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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type NodeGroupSpec struct {
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Members []string `json:"members,omitempty"`
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//+optional
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Labels map[string]string `json:"labels,omitEmpty"`
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//+optional
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Taints []corev1.Taint `json:"taints,omitEmpty"`
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}
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type NodeGroupStatus struct {
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}
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//+kubebuilder:object:root=true
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//+kubebuilder:subresource:status
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//+kubebuilder:resource:scope=Cluster
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// NodeGroup is the Schema for the nodegroups API
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type NodeGroup struct {
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metav1.TypeMeta `json:",inline"`
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metav1.ObjectMeta `json:"metadata,omitempty"`
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Spec NodeGroupSpec `json:"spec,omitempty"`
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Status NodeGroupStatus `json:"status,omitempty"`
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}
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//+kubebuilder:object:root=true
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// NodeGroupList contains a list of NodeGroup
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type NodeGroupList struct {
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metav1.TypeMeta `json:",inline"`
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metav1.ListMeta `json:"metadata,omitempty"`
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Items []NodeGroup `json:"items"`
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}
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func init() {
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SchemeBuilder.Register(&NodeGroup{}, &NodeGroupList{})
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}

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