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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. After executing command kubectl patch on your second file where you changed label you should see following error:.
After executing command kubectl apply on this file you should get following error :. Here are useful documentations: labels-selectorskubernetes-deploymentskubernetes-patch.
Learn more. Asked 7 months ago. Active 7 months ago. Viewed times. I am trying to update a label using kubectl. When I use apply it works but it doesn't when doing a patch. These are the only changes on my yaml.
I also tried specifying --type strategic and other types but none seem to work. There is no key label under metadata for a Deployment resource. See here and here. There is a labels key plural. When I try to apply a resource that matches what you're showing, I get an error error validating data: ValidationError ConfigMap.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. It not delete label but add a new label to that pod. So is there any one can tell me how to delete a label for a pod like use command :. The most convenient way is to use kubectl edit pods all-flow-0fbah.
Just remove the label field in the editor. Learn more. How to delete a label for a kubernetes pod Ask Question. Asked 3 years, 10 months ago. Active 5 months ago.
Viewed 7k times. I want delete label from a node or a pod by kubernetes API, my kubernetes version So is there any one can tell me how to delete a label for a pod like use command : kubectl label pod all-flow-0fbah key- Thanks! Active Oldest Votes. Robert Bailey Robert Bailey For a description of how the merge works, see github.
The syntax is as posted above but the data you pass in should look like the json representation of the object, which can be determined by running kubectl get pod all-flow-0fbah -o json. Lantao Liu Lantao Liu 2 2 silver badges 3 3 bronze badges. It sounds like workhardcc already found a way to use kubectl to remove the label and was trying to figure out how to do it in the raw api using curl.Edit This Page.
Set which Kubernetes cluster kubectl communicates with and modifies configuration information. See Authenticating Across Clusters with kubeconfig documentation for detailed config file information. It creates and updates resources in a cluster through running kubectl apply. This is the recommended way of managing Kubernetes applications on production.
See Kubectl Book. Kubernetes manifests can be defined in json or yaml. The file extension. As of version 1. List all supported resource types along with their shortnames, API groupwhether they are namespacedand Kind :. To output details to your terminal window in a specific format, you can add either the -o or --output flags to a supported kubectl command. Kubectl verbosity is controlled with the -v or --v flags followed by an integer representing the log level.
General Kubernetes logging conventions and the associated log levels are described here. Also kubectl Usage Conventions to understand how to use it in reusable scripts. See more community kubectl cheatsheets. Thanks for the feedback. If you have a specific, answerable question about how to use Kubernetes, ask it on Stack Overflow. Open an issue in the GitHub repo if you want to report a problem or suggest an improvement.
Kubernetes v1. The version you are currently viewing is a static snapshot. For up-to-date documentation, see the latest version. This page is an overview of the kubectl command. Will cause a service outage.Edit This Page. You can constrain a Pod The smallest and simplest Kubernetes object. A Pod represents a set of running containers on your cluster.
There are several ways to do this, and the recommended approaches all use label selectors to make the selection. Generally such constraints are unnecessary, as the scheduler will automatically do a reasonable placement e. It specifies a map of key-value pairs. For the pod to be eligible to run on a node, the node must have each of the indicated key-value pairs as labels it can have additional labels as well. The most common usage is one key-value pair.
This example assumes that you have a basic understanding of Kubernetes pods and that you have set up a Kubernetes cluster.
You can verify that it worked by re-running kubectl get nodes --show-labels and checking that the node now has a label. You can also use kubectl describe node "nodename" to see the full list of labels of the given node. Take whatever pod config file you want to run, and add a nodeSelector section to it, like this.
For example, if this is my pod config:. In addition to labels you attachnodes come pre-populated with a standard set of labels. These labels are. Adding labels to Node objects allows targeting pods to specific nodes or groups of nodes. This can be used to ensure specific pods only run on nodes with certain isolation, security, or regulatory properties.
When using labels for this purpose, choosing label keys that cannot be modified by the kubelet process on the node is strongly recommended.
This prevents a compromised node from using its kubelet credential to set those labels on its own Node object, and influencing the scheduler to schedule workloads to the compromised node. The NodeRestriction admission plugin prevents kubelets from setting or modifying labels with a node-restriction. To make use of that label prefix for node isolation:. The key enhancements are. Node affinity is conceptually similar to nodeSelector — it allows you to constrain which nodes your pod is eligible to be scheduled on, based on labels on the node.
Node affinity is specified as field nodeAffinity of field affinity in the PodSpec. This node affinity rule says the pod can only be placed on a node with a label whose key is kubernetes. In addition, among nodes that meet that criteria, nodes with a label whose key is another-node-label-key and whose value is another-node-label-value should be preferred.
You can see the operator In being used in the example. You can use NotIn and DoesNotExist to achieve node anti-affinity behavior, or use node taints to repel pods from specific nodes.
If you specify both nodeSelector and nodeAffinityboth must be satisfied for the pod to be scheduled onto a candidate node. If you specify multiple nodeSelectorTerms associated with nodeAffinity types, then the pod can be scheduled onto a node only if all nodeSelectorTerms can be satisfied. If you specify multiple matchExpressions associated with nodeSelectorTermsthen the pod can be scheduled onto a node if one of the matchExpressions is satisfied.
In other words, the affinity selection works only at the time of scheduling the pod. For each node that meets all of the scheduling requirements resource request, RequiredDuringScheduling affinity expressions, etc. This score is then combined with the scores of other priority functions for the node. The node s with the highest total score are the most preferred. Inter-pod affinity and anti-affinity allow you to constrain which nodes your pod is eligible to be scheduled based on labels on pods that are already running on the node rather than based on labels on nodes.
Y is expressed as a LabelSelector with an optional associated list of namespaces; unlike nodes, because pods are namespaced and therefore the labels on pods are implicitly namespaceda label selector over pod labels must specify which namespaces the selector should apply to. Conceptually X is a topology domain like node, rack, cloud provider zone, cloud provider region, etc. You express it using a topologyKey which is the key for the node label that the system uses to denote such a topology domain; for example, see the label keys listed above in the section Interlude: built-in node labels.Providing Feedback Provide feedback at the survey.
Users may want to define a common set of labels or annotations for all the Resource in a project. See Bases and Variations for more details on Copying Projects. Reference commonLabels commonAnnotations. Example: Add the labels declared in commonLabels to all Resources in the project. Important: Once set, commonLabels should not be changed so as not to change the Selectors for Services or Workloads. Propagating Labels to Selectors In addition to updating the labels for each Resource, any selectors will also be updated to target the labels.
Note: Once set, commonLabels should not be changed so as not to change the Selectors for Services or Workloads. Common Labels The k8s. Note: commonLabels should only be set for immutable labels, since they will be applied to Selectors. Labeling Workload Resources makes it simpler to query Pods - e. Example: Add the annotations declared in commonAnnotations to all Resources in the project. Propagating Annotations In addition to updating the annotations for each Resource, any fields that contain ObjectMeta e.
PodTemplate will also have the annotations added. Labels and Annotations. Provide feedback at the survey. Input: The kustomization. In addition to updating the labels for each Resource, any selectors will also be updated to target the labels. The k8s. In addition to updating the annotations for each Resource, any fields that contain ObjectMeta e. No results matching " ".Edit This Page. A Deployment provides declarative updates for Pods and ReplicaSets.
You describe a desired state in a Deployment, and the Deployment Controller A control loop that watches the shared state of the cluster through the apiserver and makes changes attempting to move the current state towards the desired state.
You can define Deployments to create new ReplicaSets, or to remove existing Deployments and adopt all their resources with new Deployments. The following is an example of a Deployment.Kubernetes Concepts Explained in 9 minutes!
It creates a ReplicaSet to bring up three nginx Pods:. The selector field defines how the Deployment finds which Pods to manage. In this case, you simply select a label that is defined in the Pod template app: nginx. However, more sophisticated selection rules are possible, as long as the Pod template itself satisfies the rule.
All of the requirements, from both matchLabels and matchExpressionsmust be satisfied in order to match.
Note: You may specify the —record flag to write the command executed in the resource annotation kubernetes. It is useful for future introspection. For example, to see the commands executed in each Deployment revision. Run kubectl get deployments to check if the Deployment was created. If the Deployment is still being created, the output is similar to the following:.
To see the Deployment rollout status, run kubectl rollout status deployment. The output is similar to this:. Run the kubectl get deployments again a few seconds later. Notice that the Deployment has created all three replicas, and all replicas are up-to-date they contain the latest Pod template and available.
To see the ReplicaSet rs created by the Deployment, run kubectl get rs. The random string is randomly generated and uses the pod-template-hash as a seed.Edit This Page. A Deployment controller provides declarative updates for Pods and ReplicaSets. You describe a desired state in a Deployment object, and the Deployment controller changes the actual state to the desired state at a controlled rate. You can define Deployments to create new ReplicaSets, or to remove existing Deployments and adopt all their resources with new Deployments.
Setting the kubectl flag --record to true allows you to record current command in the annotations of the resources being created or updated. It is useful for future introspection: for example, to see the commands executed in each Deployment revision.
Note the pod-template-hash label in the example output in the pod labels above. This label is added by the Deployment controller to every ReplicaSet that a Deployment creates or adopts.
Trigger a redeploy in Kubernetes
Its purpose is to make sure that child ReplicaSets of a Deployment do not overlap. It is computed by hashing the PodTemplate of the ReplicaSet and using the resulting hash as the label value that will be added in the ReplicaSet selector, pod template labels, and in any existing Pods that the ReplicaSet may have.
Suppose that we now want to update the nginx Pods to use the nginx Alternatively, we can edit the Deployment and change. The number of up-to-date replicas indicates that the Deployment has updated the replicas to the latest configuration.
The current replicas indicates the total replicas this Deployment manages, and the available replicas indicates the number of current replicas that are available. We can run kubectl get rs to see that the Deployment updated the Pods by creating a new ReplicaSet and scaling it up to 3 replicas, as well as scaling down the old ReplicaSet to 0 replicas.
Setting Labels and Annotations
Deployment can ensure that only a certain number of Pods may be down while they are being updated. By default, it ensures that at least 1 less than the desired number of Pods are up 1 max unavailable.
Deployment can also ensure that only a certain number of Pods may be created above the desired number of Pods. By default, it ensures that at most 1 more than the desired number of Pods are up 1 max surge. For example, if you look at the above Deployment closely, you will see that it first created a new Pod, then deleted some old Pods and created new ones.