编写 Operator 的方案 —— 2、基于 sample-controller

https://github.com/kubernetes/sample-controller

  首先我们将基于 k8s.io/sample-controller 来实现 cnat，通过直接使用 client-go 完成。

  sample-controller 使用 k8s.io/code-generator 来生成强类型的客户端、Informer、Lister 和深拷贝函数。如果你的自定义控制器中的 API 发生了变化，比如在自定义资源中添加了一个新的字段，你需要运行 update-codegen.sh 脚本来重新生成先前提到过的源代码文件。

  我们开始基于 sample-controller 使用 client-go 来实现我们的 cnat Operator 吧。

  1、首先，运行 go get k8s.io/sample-controller 获取相关的源代码及依赖并安装到系统中。

[root@JumperServer:zuoyang] # mkdir -pv sample-controller
mkdir: created directory 'sample-controller'
[root@JumperServer:zuoyang] # cd sample-controller/
[root@JumperServer:sample-controller] # ll
total 0
[root@JumperServer:sample-controller] # go mod init sample-controller
go: creating new go.mod: module sample-controller
[root@JumperServer:sample-controller] # ll
total 4
-rw-r--r-- 1 root root 36 Aug 21 17:38 go.mod
[root@JumperServer:sample-controller] # go get k8s.io/sample-controller
go: added github.com/davecgh/go-spew v1.1.1
go: added github.com/emicklei/go-restful/v3 v3.9.0
go: added github.com/go-logr/logr v1.2.4
go: added github.com/go-openapi/jsonpointer v0.19.6
go: added github.com/go-openapi/jsonreference v0.20.2
go: added github.com/go-openapi/swag v0.22.3
go: added github.com/gogo/protobuf v1.3.2
go: added github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
go: added github.com/golang/protobuf v1.5.3
go: added github.com/google/gnostic-models v0.6.8
go: added github.com/google/go-cmp v0.5.9
go: added github.com/google/gofuzz v1.2.0
go: added github.com/google/uuid v1.3.0
go: added github.com/imdario/mergo v0.3.6
go: added github.com/josharian/intern v1.0.0
go: added github.com/json-iterator/go v1.1.12
go: added github.com/mailru/easyjson v0.7.7
go: added github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
go: added github.com/modern-go/reflect2 v1.0.2
go: added github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822
go: added github.com/spf13/pflag v1.0.5
go: added golang.org/x/net v0.13.0
go: added golang.org/x/oauth2 v0.8.0
go: added golang.org/x/sys v0.10.0
go: added golang.org/x/term v0.10.0
go: added golang.org/x/text v0.11.0
go: added golang.org/x/time v0.3.0
go: added google.golang.org/appengine v1.6.7
go: added google.golang.org/protobuf v1.30.0
go: added gopkg.in/inf.v0 v0.9.1
go: added gopkg.in/yaml.v2 v2.4.0
go: added gopkg.in/yaml.v3 v3.0.1
go: added k8s.io/api v0.28.0
go: added k8s.io/apimachinery v0.28.0
go: added k8s.io/client-go v0.28.0
go: added k8s.io/klog/v2 v2.100.1
go: added k8s.io/kube-openapi v0.0.0-20230717233707-2695361300d9
go: added k8s.io/sample-controller v0.28.0
go: added k8s.io/utils v0.0.0-20230406110748-d93618cff8a2
go: added sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd
go: added sigs.k8s.io/structured-merge-diff/v4 v4.2.3
go: added sigs.k8s.io/yaml v1.3.0
[root@JumperServer:sample-controller] #