下载安装

 curl -L -o kubebuilder https://go.kubebuilder.io/dl/latest/$(go env GOOS)/$(go env GOARCH)
 chmod +x kubebuilder && mv kubebuilder /usr/local/bin/

创建一个项目

mkdir vm-operator 
cd vm-operator
go mod init vm-operator
kubebuilder init --domain cloud.com --owner "yuanqh" --skip-go-version-check
kubebuilder create api --group hft --version v1 --kind VirtualMachine

执行kubebuilder create api发生下面错误

make: *** [generate] Error 1
Error: failed to create API: unable to run post-scaffold tasks of "base.go.kubebuilder.io/v3": exit status 2

则需要安装gcc

yum install gcc

如果没有tree命令

 yum -y install tree
 执行tree 可以看到当前目录的结构
 [root@k8s-master01 vm-operator]# tree .
.
├── api
│   └── v1
│       ├── groupversion_info.go
│       ├── virtualmachined_types.go
│       └── zz_generated.deepcopy.go
├── bin
│   └── controller-gen
├── config
│   ├── crd
│   │   ├── bases
│   │   │   └── hft.cloud.com_virtualmachineds.yaml
│   │   ├── kustomization.yaml
│   │   ├── kustomizeconfig.yaml
│   │   └── patches
│   │       ├── cainjection_in_virtualmachineds.yaml
│   │       └── webhook_in_virtualmachineds.yaml

VirtualMachinedSpec对象添加如下属性

UUID   string `json:"uuid,omitempty"`
Name   string `json:"name,omitempty"`
Image  string `json:"image,omitempty"`
Memory int    `json:"memory,omitempty"`
Disk   int    `json:"disk,omitempty"`

需要注意 json:"disk,omitempty" 的格式
修改属性后重新生成代码

 make manifests generate

安装到k8s集群中

make install

make指令含义,可以通过make help查看帮助,具体如下:

[root@k8s-master01 vm-operator]# make help

Usage:
  make <target>

General
  help             Display this help.

Development
  manifests        Generate WebhookConfiguration, ClusterRole and CustomResourceDefinition objects.
  generate         Generate code containing DeepCopy, DeepCopyInto, and DeepCopyObject method implementations.
  fmt              Run go fmt against code.
  vet              Run go vet against code.
  test             Run tests.

Build
  build            Build manager binary.
  run              Run a controller from your host.
  docker-build     Build docker image with the manager.
  docker-push      Push docker image with the manager.

Deployment
  install          Install CRDs into the K8s cluster specified in ~/.kube/config.
  uninstall        Uninstall CRDs from the K8s cluster specified in ~/.kube/config. Call with ignore-not-found=true to ignore resource not found errors during deletion.
  deploy           Deploy controller to the K8s cluster specified in ~/.kube/config.
  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.
  controller-gen   Download controller-gen locally if necessary.
  kustomize        Download kustomize locally if necessary.
  envtest          Download envtest-setup locally if necessary.