kubebuilder中的controller:latest是什么镜像

首先看一下kubebuilder自动生成的项目中的makefile：

# Current Operator version
VERSION ?= 0.0.1
# Default bundle image tag
BUNDLE_IMG ?= controller-bundle:$(VERSION)
# Options for 'bundle-build'
ifneq ($(origin CHANNELS), undefined)
BUNDLE_CHANNELS := --channels=$(CHANNELS)
endif
ifneq ($(origin DEFAULT_CHANNEL), undefined)
BUNDLE_DEFAULT_CHANNEL := --default-channel=$(DEFAULT_CHANNEL)
endif
BUNDLE_METADATA_OPTS ?= $(BUNDLE_CHANNELS) $(BUNDLE_DEFAULT_CHANNEL)

# Image URL to use all building/pushing image targets
IMG ?= controller:latest
# Produce CRDs that work back to Kubernetes 1.11 (no version conversion)
CRD_OPTIONS ?= "crd:trivialVersions=true"

# Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
ifeq (,$(shell go env GOBIN))
GOBIN=$(shell go env GOPATH)/bin
else
GOBIN=$(shell go env GOBIN)
endif


setup: fmt vet docker-build

all: manager

# Run tests
ENVTEST_ASSETS_DIR = $(shell pwd)/testbin
test: generate fmt vet manifests
    mkdir -p $(ENVTEST_ASSETS_DIR)
    test -f $(ENVTEST_ASSETS_DIR)/setup-envtest.sh || curl -sSLo $(ENVTEST_ASSETS_DIR)/setup-envtest.sh https://raw.githubusercontent.com/kubernetes-sigs/controller-runtime/v0.6.3/hack/setup-envtest.sh
    source $(ENVTEST_ASSETS_DIR)/setup-envtest.sh; fetch_envtest_tools $(ENVTEST_ASSETS_DIR); setup_envtest_env $(ENVTEST_ASSETS_DIR); go test ./... -coverprofile cover.out

# Build manager binary
manager: generate fmt vet
    go build -o bin/manager main.go

# Run against the configured Kubernetes cluster in ~/.kube/config
run: generate fmt vet manifests
    go run ./main.go

# Install CRDs into a cluster
install: manifests kustomize
    $(KUSTOMIZE) build config/crd | kubectl apply -f -

# Uninstall CRDs from a cluster
uninstall: manifests kustomize
    $(KUSTOMIZE) build config/crd | kubectl delete -f -

# Deploy controller in the configured Kubernetes cluster in ~/.kube/config
deploy: manifests kustomize
    cd config/manager && $(KUSTOMIZE) edit set image controller=${IMG}
    $(KUSTOMIZE) build config/default | kubectl apply -f -

undeploy: ## Undeploy controller from the K8s cluster specified in ~/.kube/config.
    $(KUSTOMIZE) build config/default | kubectl delete -f -

# Generate manifests e.g. CRD, RBAC etc.
manifests: controller-gen
    $(CONTROLLER_GEN) $(CRD_OPTIONS) rbac:roleName=manager-role webhook paths="./..." output:crd:artifacts:config=config/crd/bases

# Run go fmt against code
fmt:
    go fmt ./...

# Run go vet against code
vet:
    go vet ./...

# Generate code
generate: controller-gen
    $(CONTROLLER_GEN) object:headerFile="hack/boilerplate.go.txt" paths="./..."

# Build the docker image
docker-build:
    docker build . -t ${IMG}

# Push the docker image
docker-push:
    docker push ${IMG}

# find or download controller-gen
# download controller-gen if necessary
controller-gen:
ifeq (, $(shell which controller-gen))
    @{ 
    set -e ;
    CONTROLLER_GEN_TMP_DIR=$$(mktemp -d) ;
    cd $$CONTROLLER_GEN_TMP_DIR ;
    go mod init tmp ;
    go get sigs.k8s.io/controller-tools/cmd/controller-gen@v0.3.0 ;
    rm -rf $$CONTROLLER_GEN_TMP_DIR ;
    }
CONTROLLER_GEN=$(GOBIN)/controller-gen
else
CONTROLLER_GEN=$(shell which controller-gen)
endif

kustomize:
ifeq (, $(shell which kustomize))
    @{ 
    set -e ;
    KUSTOMIZE_GEN_TMP_DIR=$$(mktemp -d) ;
    cd $$KUSTOMIZE_GEN_TMP_DIR ;
    go mod init tmp ;
    go get sigs.k8s.io/kustomize/kustomize/v3@v3.5.4 ;
    rm -rf $$KUSTOMIZE_GEN_TMP_DIR ;
    }
KUSTOMIZE=$(GOBIN)/kustomize
else
KUSTOMIZE=$(shell which kustomize)
endif

# Generate bundle manifests and metadata, then validate generated files.
.PHONY: bundle
bundle: manifests kustomize
    operator-sdk generate kustomize manifests -q
    cd config/manager && $(KUSTOMIZE) edit set image controller=$(IMG)
    $(KUSTOMIZE) build config/manifests | operator-sdk generate bundle -q --overwrite --version $(VERSION) $(BUNDLE_METADATA_OPTS)
    operator-sdk bundle validate ./bundle

# Build the bundle image.
.PHONY: bundle-build
bundle-build:
    docker build -f bundle.Dockerfile -t $(BUNDLE_IMG) .

# 后面的就是自己实现
demo:
ifeq ($(clear),true)
    kubectl delete -f config/samples/nacos.yaml
    kubectl delete pod -l app=nacos --grace-period=0 --force
else
ifeq ($(type),cluster)
    echo "cluster mode"
    kubectl apply -f config/samples/nacos_cluster.yaml
else
    echo "standalone mode"
    kubectl apply -f config/samples/nacos.yaml
endif
endif


image_operator: docker-build docker-push

第15行中的 IMG ?= controller:latest 说明，如果没有为IMG赋值，则IMG会为controller:latest，

第56行中的 make deploy子命令中：cd config/manager && $(KUSTOMIZE) edit set image controller=${IMG}，说明把 nacos-operator/config/manager/manager.yaml 下的image:controller:latest中的controller替换成了设置的IMG。（这里我的项目名是nacos-operator）

比如项目部署时候运行命令：make deploy IMG=xxx:1.0

则该 manager.yaml 镜像就会被替换成 xxx:1.0:latest，这样就导致了错误，可以把manager.yaml 中的controller:latest中的 :latest 去掉就可以解决这个问题了。

manager.yaml文件内容：