.spec.selector must match .spec.template.metadata.labels, or it will be rejected by the API. In API version apps/v1, .spec.selector and .metadata.labels do not default to .spec.template.metadata.labels if not set. So they must be set explicitly. Also note that .spec.selector is immutable after creation of the Deployment in apps/v1.

A selector to restrict the list of returned objects by their labels. Defaults A selector to restrict the list of returned objects by their fields. Defaults Image. Image is an immutable representation of a Docker image and metadata

Before we talk about field selector in Kubernetes, let us walk through quickly about labels. Labels are key value pairs that can be used to identify, or group the resources in Kubernetes. Labels are key/value pairs that are attached to objects, such as pods. Labels are intended to be used to specify identifying attributes of objects that are meaningful and relevant to users, but do not directly imply semantics to the core system. Labels can be used to organize and to select subsets of objects. Labels can be attached to objects at creation time and subsequently added and $kubectl apply -f app.yaml The Deployment "my-app" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app":"my-app-change"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable and you can see the selector for deployed: $kubectl describe deployment my-app Name: my-app Selector: app=my-app you can see that the deployment name my-app already has a selector and the content is app=my-app. So they must be set explicitly.

Label selector field is immutable

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Jun 21, 2019 LabelSelector{MatchLabels:map[string]string{"instance":"my-application", LabelSelectorRequirement(nil)}: field is immutable. Any docs

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The label field consists of multiple optional key-value pairs. Pods that match a selector (by matching a namespace for the selector and all of the labels specified in the selector) are scheduled on Fargate.

The Service "labeler" is invalid. * metadata.resourceVersion: Invalid value: "": must be specified for an update * spec.clusterIP: Invalid value: "": field is immutable I just nuked the last-applied-configuration annotation and the change applied successfully. 👍 In contrast, by making selectors immutable, validation ensures the selectors always match template labels of created children. For that to work, you would also have to make the template labels immutable, which is another significant change (updating template labels is currently allowed). 2018-07-14 · Before we talk about the field selector in Kubernetes, let’s quickly walk through what labels are.

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petarGitNik changed the title [prometheus] Upgrade from 13.1.0 to 13.2.0 fails - label selector fiel is immutable for kube-state-metrics [prometheus] Upgrade from 13.1.0 to 13.2.0 fails - label selector field is immutable for kube-state-metrics on Jan 12. the selector in Deployment, ReplicaSet, and DaemonSet objects is immutable as of the apps/v1beta2 API. See kubernetes/kubernetes#50808 /close.

场景复现例：app.yamlapiVersion: apps/v1 Kubernetes报错:MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable. 藏红2020-04-18 17:14:113957收藏. #总结: 1,在Deployment中必须写matchLables, 2,在定义模板的时候必须定义labels,因为Deployment.spec.selector是必须字段,而他又必须和template.labels对应, 3,template里面定义的内容会应用到下面所有的副本集里面,在template.spec.containers里面不能定义labels标签. But anyway, the selector: matchLabels tells the resource, whatever it may be, service, deployment, etc, to match the pod, according to that label.
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Kubernetes selector allows us to select Kubernetes resources based on the value of labels and resource fields assigned to a group of pods or nodes. It is useful when we have to get details or perform any action on a group of Kubernetes resources or when we have to deploy a pod or group of pods on a specific group of nodes.

mutates. mutating selectivity. selector. selectors. selects.