Kubernetes-CRD-Demo

创建工程

利用go module创建模块

root@ubuntu:~/go_learn/proj1# go mod init  demo-controller
go: creating new go.mod: module demo-controller
root@ubuntu:~/go_learn/proj1# ls
go.mod
root@ubuntu:~/go_learn/proj1# mkdir  demo-controller
root@ubuntu:~/go_learn/proj1#

编写`pkg/api`

code-generator要求工程的目录结构满足一定的规则

目录结构必须为pkg/apis/xxx/yyy/
包含如下文件
1. doc.go
2. register.go
3. types.go

`hack`

这部分内容，我们直接从kubernetes官方示例（sample-controller）中拷贝即可

执行脚本创建`pkg/generated`

在执行脚本前，我们需要先下载一个依赖的脚本，就是update-codegen.sh中提到的generate-groups.sh

root@ubuntu:~/go_learn/proj1/demo-controller/hack# ls
boilerplate.go.txt  custom-boilerplate.go.txt  tools.go  update-codegen.sh  verify-codegen.sh
root@ubuntu:~/go_learn/proj1/demo-controller/hack# cd ../../
root@ubuntu:~/go_learn/proj1# ls
demo-controller  go.mod
root@ubuntu:~/go_learn/proj1# cd $GOPATH
root@ubuntu:/opt/gopath# mkdir -p src/k8s.io
root@ubuntu:/opt/gopath# cd src/k8s.io
root@ubuntu:/opt/gopath/src/k8s.io# git clone https://github.com/kubernetes/code-generator.git
Cloning into 'code-generator'...

remote: Enumerating objects: 10133, done.
remote: Counting objects: 100% (511/511), done.
remote: Compressing objects: 100% (182/182), done.
remote: Total 10133 (delta 340), reused 483 (delta 325), pack-reused 9622
Receiving objects: 100% (10133/10133), 9.28 MiB | 9.40 MiB/s, done.
Resolving deltas: 100% (5440/5440), done.
root@ubuntu:/opt/gopath/src/k8s.io# 
root@ubuntu:/opt/gopath/src/k8s.io# cd ~/go_learn/proj1/
root@ubuntu:~/go_learn/proj1# ls
demo-controller  go.mod
root@ubuntu:~/go_learn/proj1# cd ~/go_learn/proj1/demo-controller/
root@ubuntu:~/go_learn/proj1/demo-controller# ls
hack  pkg
root@ubuntu:~/go_learn/proj1/demo-controller# bash hack/update-codegen.sh
go: downloading k8s.io/gengo v0.0.0-20201214224949-b6c5ce23f027
go: downloading golang.org/x/tools v0.1.2
go: downloading golang.org/x/mod v0.4.2
go: downloading golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
Generating deepcopy funcs
Generating clientset for democontroller:v1 at demo-controller/pkg/generated/clientset
Generating listers for democontroller:v1 at demo-controller/pkg/generated/listers
Generating informers for democontroller:v1 at demo-controller/pkg/generated/informers
root@ubuntu:~/go_learn/proj1/demo-controller#

root@ubuntu:~/go_learn/proj1/demo-controller# ls pkg/
apis
root@ubuntu:~/go_learn/proj1/demo-controller# ls pkg/apis/
democontroller
root@ubuntu:~/go_learn/proj1/demo-controller# ls pkg/apis/democontroller/
v1
root@ubuntu:~/go_learn/proj1/demo-controller# ls pkg/apis/democontroller/v1/
doc.go  register.go  types.go
root@ubuntu:~/go_learn/proj1/demo-controller# ls
hack  pkg
root@ubuntu:~/go_learn/proj1/demo-controller# cd ..
root@ubuntu:~/go_learn/proj1# ls
demo-controller  go.mod
root@ubuntu:~/go_learn/proj1# ls demo-controller/pkg/generated/listers
ls: cannot access 'demo-controller/pkg/generated/listers': No such file or directory
root@ubuntu:~/go_learn/proj1# ls demo-controller/pkg/generated/ 
ls: cannot access 'demo-controller/pkg/generated/': No such file or directory   --什么都没有
root@ubuntu:~/go_learn/proj1# ls demo-controller/pkg/
apis
root@ubuntu:~/go_learn/proj1# ls demo-controller/pkg/apis/
democontroller
root@ubuntu:~/go_learn/proj1#

原来是go mod init demo-controller使用了错误的目录

root@ubuntu:~/go_learn/proj1/demo-controller# go mod init  demo-controller
go: creating new go.mod: module demo-controller
root@ubuntu:~/go_learn/proj1/demo-controller# ls
go.mod  hack  pkg
root@ubuntu:~/go_learn/proj1/demo-controller#  bash hack/update-codegen.sh
Generating deepcopy funcs
Generating clientset for democontroller:v1 at demo-controller/pkg/generated/clientset
Generating listers for democontroller:v1 at demo-controller/pkg/generated/listers
Generating informers for democontroller:v1 at demo-controller/pkg/generated/informers
root@ubuntu:~/go_learn/proj1/demo-controller# ls demo-controller/pkg/generated
ls: cannot access 'demo-controller/pkg/generated': No such file or directory
root@ubuntu:~/go_learn/proj1/demo-controller# ls demo-controller/pkg/
ls: cannot access 'demo-controller/pkg/': No such file or directory
root@ubuntu:~/go_learn/proj1/demo-controller# ls
go.mod  go.sum  hack  pkg
root@ubuntu:~/go_learn/proj1/demo-controller# ls pkg/
apis  generated
root@ubuntu:~/go_learn/proj1/demo-controller#

root@ubuntu:~/go_learn/proj1/demo-controller# cat hack/update-codegen.sh
#!/usr/bin/env bash

# Copyright 2017 The Kubernetes Authors.
#
# 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.

set -o errexit
set -o nounset
set -o pipefail

SCRIPT_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
CODEGEN_PKG=${GOPATH}/src/k8s.io/code-generator

# generate the code with:
# --output-base because this script should also be able to run inside the vendor dir of
# k8s.io/kubernetes. The output-base is needed for the generators to output into the vendor dir
# instead of the $GOPATH directly. For normal projects this can be dropped.
bash "${CODEGEN_PKG}"/generate-groups.sh "deepcopy,client,informer,lister"
demo-controller/pkg/generated demo-controller/pkg/apis
democontroller:v1
# --output-base "$(dirname "${BASH_SOURCE[0]}")/../../.."
# --go-header-file "${SCRIPT_ROOT}"/hack/boilerplate.go.txt

# To use your own boilerplate text append:
# --go-header-file "${SCRIPT_ROOT}"/hack/custom-boilerplate.go.txt

更改