《Kubernetes Operator开发进阶》将在2022年12月由机械工业出版社出版。
本仓库包含书中的3个演示项目代码:
- 第二章 Application Operator Demo
- 第四章 client-go 使用示例
- 第七章 Application Operator
纸质书,2023年1月初出版
P69 中“我们可以直接打开staging/k8s.io/client-go"正确目录应为”staging/src/k8s.io/client-go“
书籍150页。 代码逻辑写完,执行make install后,可以查询到crd,但是查询不到application资源,应该是需要编写application资源的yaml文件,然后创建。yaml不知道咋写,各位大佬支援下呢,谢谢!
$ kubectl get crd applications.apps.tanlay.com
NAME CREATED AT
applications.apps.tanlay.com 2023-01-29T12:57:45
$ kubectl get application
No resources found in default namespace.
apiVersion: apps.tanlay.com/v1
kind: Application
metadata:
name: application-sample
spec:
# TODO(user): Add fields here
deployment:
...
service:
...
UpdateFunc部分应该是Service对象,不是Application吧
Owns(&corev1.Service{}, builder.WithPredicates(predicate.Funcs{
...
UpdateFunc: func(event event.UpdateEvent) bool {
if event.ObjectNew.GetResourceVersion() == event.ObjectOld.GetResourceVersion() {
return false
}
if reflect.DeepEqual(event.ObjectNew.(*v1.Application).Spec, event.ObjectOld.(*v1.Application).Spec) {
return false
}
return true
},
})).
Owns(&corev1.Service{}, builder.WithPredicates(predicate.Funcs{
...
UpdateFunc: func(event event.UpdateEvent) bool {
if event.ObjectNew.GetResourceVersion() == event.ObjectOld.GetResourceVersion() {
return false
}
if reflect.DeepEqual(event.ObjectNew.(*corev1.Service).Spec, event.ObjectOld.(*corev1.Service).Spec) {
return false
}
return true
},
})).
我的代码:
// CoffeeSpec defines the desired state of Coffee
type CoffeeSpec struct {
// INSERT ADDITIONAL SPEC FIELDS - desired state of cluster
// Important: Run "make" to regenerate code after modifying this file
Replicas int32 `json:"replicas,omitempty"`
Template corev1.PodTemplateSpec `json:"template,omitempty"`
}
我的环境
错误
* spec.validation.openAPIV3Schema.properties[spec].properties[template].properties[spec].properties[volumes].items.properties[ephemeral].properties[volumeClaimTemplate].properties[spec].properties[resources].properties[claims].items.x-kubernetes-map-type: Invalid value: "null": must be atomic as item of a list with x-kubernetes-list-type=set
* spec.validation.openAPIV3Schema.properties[spec].properties[template].properties[spec].properties[ephemeralContainers].items.properties[resources].properties[claims].items.x-kubernetes-map-type: Invalid value: "null": must be atomic as item of a list with x-kubernetes-list-type=set
* spec.validation.openAPIV3Schema.properties[spec].properties[template].properties[spec].properties[containers].items.properties[resources].properties[claims].items.x-kubernetes-map-type: Invalid value: "null": must be atomic as item of a list with x-kubernetes-list-type=set
* spec.validation.openAPIV3Schema.properties[spec].properties[template].properties[spec].properties[initContainers].items.properties[resources].properties[claims].items.x-kubernetes-map-type: Invalid value: "null": must be atomic as item of a list with x-kubernetes-list-type=set
make: *** [install] Error 1
```
dappsv1 "github.com/daniel-hutao/application-operator/api/v1"
this links is error, when run "make run", it will be run "go get github.com/daniel-hutao/application-operator/api/v1"
How do I understand the api of this ”dappsv1“
报错如下:
$ kubectl apply -f config/samples/apps_v2_application.yaml
Error from server: error when retrieving current configuration of:
Resource: "apps.tanlay.com/v2, Resource=applications", GroupVersionKind: "apps.tanlay.com/v2, Kind=Application"
Name: "nginx-sample", Namespace: "default"
from server for: "config/samples/apps_v2_application.yaml": conversion webhook for apps.tanlay.com/v1, Kind=Application failed: the server could not find the requested resource
api/v2/application_types.go文件
// 只修改了ApplicationSpec结构体的Deployment字段为Workflow,其他和v1版本一致,
// 只在v1版本增加了持久化 //+kubebuilder:storageversion
type ApplicationSpec struct {
// INSERT ADDITIONAL SPEC FIELDS - desired state of cluster
// Important: Run "make" to regenerate code after modifying this file
Workflow v1.DeploymentTemplate `json:"workflow,omitempty"`
Service v1.ServiceTemplate `json:"service,omitempty"`
}
我的集群是1.23.0版本
使用作者的Dockerfile发现了一些问题:
FROM busybox
COPY ./in-cluster /in-cluster
USER 65532:65532
ENTRYPOINT /in-cluster
执行kubectl run in-cluster -i --image=docker.io/in-cluster:v0.0.1 --restart=Never --overrides='{"spec": {"imagePullSecrets": [{"name": "image-pull-secret"}]}}'会报错:
pod default/in-cluster terminated (Error)
单从image的size上来说,busybox更小。不过busybox默认的libc实现是uClibc,而我们通常运行环境使用的libc实现都是glibc,因此我们要么选择静态编译程序,要么使用busybox:glibc镜像作为base image。
所以我把Dockerfile改为:
FROM busybox:glibc
WORKDIR /
COPY in-cluster .
ENTRYPOINT ["./in-cluster"]
就可以正常执行程序了。
测试了很久,主要是版本问题,导致各种问题不断。现在把一个比较好的版本放这里,ubuntu和linux下开发的同学可以参考我readme仓库里面的版本信息。
/data/gomod/pkg/mod/sigs.k8s.io/[email protected]/pkg/log/deleg.go:79:12: undefined: logr.WithCallDepth
/data/gomod/pkg/mod/sigs.k8s.io/[email protected]/pkg/log/deleg.go:163:2: cannot use res (type *DelegatingLogger) as type logr.Logger in return argument
/data/gomod/pkg/mod/sigs.k8s.io/[email protected]/pkg/log/deleg.go:179:2: cannot use res (type *DelegatingLogger) as type logr.Logger in return argument
原文为
...
GOOS=linux go build -o ./in-cluster .
根据上一步的Dockerfile,应改为
...
GOOS=linux go build -o ./app .
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