如何使用 client-go 访问 service.yaml 中的 metadata.labels.{custom_field}?
How to access metadata.labels.{custom_field} in service.yaml with client-go?
我目前正在使用 Go 进行一个副项目。我正在尝试获取有关集群上 pods 运行 的信息。
我可以根据命名空间值到达 pods,但是为了使用 service.yaml 文件中的 metadata.labels.applicationGroup 值到达工作 pods,我需要先获取这个值
我在下面添加了我的 service.yaml 文件的一部分。
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: metadata-name
labels:
service: service-name
applicationGroup: beta --> this field
spec:
replicas: 1
selector:
matchLabels:
service: service-name
template:
metadata:
labels:
service: service-name
spec:
containers:
- name: nginx
image: nginx:1.15.8
ports:
- containerPort: 80
...
现在,我可以使用“默认”命名空间访问信息 pods。
func getPodsInfo() (string, error) {
var kubeConfig *string
if home := homedir.HomeDir(); home != "" {
kubeConfig = flag.String("kubeConfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeConfig file")
} else {
kubeConfig = flag.String("kubeConfig", "", "absolute path to the kubeConfig file")
}
flag.Parse()
config, err := clientcmd.BuildConfigFromFlags("", *kubeConfig)
if err != nil {
err = fmt.Errorf("error occured when build config from flags: %s", err.Error())
return "", err
}
clientSet, err := kubernetes.NewForConfig(config)
if err != nil {
err = fmt.Errorf("error occured when build client set from config: %s", err.Error())
return "", err
}
/*
listOptions := meta.ListOptions{
FieldSelector: "metadata.labels.applicationGroup=alpha",
}
*/
pods, err := clientSet.CoreV1().Pods("default").List(context.TODO(), metav1.ListOptions{})
if err != nil {
err = fmt.Errorf("error occured when get pods info from k8s: %s", err.Error())
return "", err
}
podsInfo, err := json.Marshal(&pods)
if err != nil {
err = fmt.Errorf("error occured when json marshal: %s", err.Error())
return "", err
}
return string(podsInfo), nil
}
我试过FieldSelector,但是FieldSelector已经支持了一些字段。
listOptions := meta.ListOptions{
FieldSelector: "metadata.labels.applicationGroup=alpha",
}
我收到以下错误。
field label not supported: metadata.labels.applicationGroup
您可以查看此 link 以了解支持的字段。
关于我的问题,我怎样才能用 cilent_go 达到 metadata.labels.applicationGroup 值,我应该使用哪个函数来达到 pods 使用这个值?
只需使用 LabelSelector 而不是 FieldSelector
listOptions := meta.ListOptions{
LabelSelector: "applicationGroup=alpha",
}
UPD:如果你想将它用于 pods,你应该在 pod 模板上设置 applicationGroup
apiVersion: apps/v1
kind: Deployment
metadata:
name: metadata-name
labels:
service: service-name
spec:
replicas: 1
selector:
matchLabels:
service: service-name
template:
metadata:
labels:
service: service-name
applicationGroup: beta
spec:
containers:
- name: nginx
image: nginx:1.15.8
ports:
- containerPort: 80
我目前正在使用 Go 进行一个副项目。我正在尝试获取有关集群上 pods 运行 的信息。
我可以根据命名空间值到达 pods,但是为了使用 service.yaml 文件中的 metadata.labels.applicationGroup 值到达工作 pods,我需要先获取这个值
我在下面添加了我的 service.yaml 文件的一部分。
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: metadata-name
labels:
service: service-name
applicationGroup: beta --> this field
spec:
replicas: 1
selector:
matchLabels:
service: service-name
template:
metadata:
labels:
service: service-name
spec:
containers:
- name: nginx
image: nginx:1.15.8
ports:
- containerPort: 80
...
现在,我可以使用“默认”命名空间访问信息 pods。
func getPodsInfo() (string, error) {
var kubeConfig *string
if home := homedir.HomeDir(); home != "" {
kubeConfig = flag.String("kubeConfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeConfig file")
} else {
kubeConfig = flag.String("kubeConfig", "", "absolute path to the kubeConfig file")
}
flag.Parse()
config, err := clientcmd.BuildConfigFromFlags("", *kubeConfig)
if err != nil {
err = fmt.Errorf("error occured when build config from flags: %s", err.Error())
return "", err
}
clientSet, err := kubernetes.NewForConfig(config)
if err != nil {
err = fmt.Errorf("error occured when build client set from config: %s", err.Error())
return "", err
}
/*
listOptions := meta.ListOptions{
FieldSelector: "metadata.labels.applicationGroup=alpha",
}
*/
pods, err := clientSet.CoreV1().Pods("default").List(context.TODO(), metav1.ListOptions{})
if err != nil {
err = fmt.Errorf("error occured when get pods info from k8s: %s", err.Error())
return "", err
}
podsInfo, err := json.Marshal(&pods)
if err != nil {
err = fmt.Errorf("error occured when json marshal: %s", err.Error())
return "", err
}
return string(podsInfo), nil
}
我试过FieldSelector,但是FieldSelector已经支持了一些字段。
listOptions := meta.ListOptions{
FieldSelector: "metadata.labels.applicationGroup=alpha",
}
我收到以下错误。
field label not supported: metadata.labels.applicationGroup
您可以查看此 link 以了解支持的字段。
关于我的问题,我怎样才能用 cilent_go 达到 metadata.labels.applicationGroup 值,我应该使用哪个函数来达到 pods 使用这个值?
只需使用 LabelSelector 而不是 FieldSelector
listOptions := meta.ListOptions{
LabelSelector: "applicationGroup=alpha",
}
UPD:如果你想将它用于 pods,你应该在 pod 模板上设置 applicationGroup
apiVersion: apps/v1
kind: Deployment
metadata:
name: metadata-name
labels:
service: service-name
spec:
replicas: 1
selector:
matchLabels:
service: service-name
template:
metadata:
labels:
service: service-name
applicationGroup: beta
spec:
containers:
- name: nginx
image: nginx:1.15.8
ports:
- containerPort: 80