How do I switch between clusters in Kubernetes?
After your clusters, users, and contexts are defined in one or more configuration files, you can quickly switch between clusters by using the kubectl config use-context command. Note: A file that is used to configure access to a cluster is sometimes called a kubeconfig file.
How to change the cluster name in kubeadm?
The command to use is Change the clusterName: field to the desired one, save and exit. You will be presented with configmap/kubeadm-config edited output. Make sure the Cluster Name is all lowercase. Notice the output of kubectl config view with the new Cluster name. It is a good practice to change the context name to reflect the new Cluster Name.
How to set the kubectl config to the current context?
Set the current context: kubectl config --kubeconfig=config-demo use-context dev-frontend Now whenever you enter a kubectl command, the action will apply to the cluster, and namespace listed in the dev-frontend context. And the command will use the credentials of the user listed in the dev-frontend context.
How do I control verbosity in Kubernetes logging?
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. Generally useful for this to always be visible to a cluster operator.
How do I change my cluster name?
How to Change the Cluster NameBecome superuser on any node in the global cluster.Start the clsetup utility. ... To change the cluster name, type the number that corresponds to the option for Other Cluster Properties. ... Make your selection from the menu and follow the onscreen instructions.More items...
How do I change clusters in Kubernetes?
After your clusters, users, and contexts are defined in one or more configuration files, you can quickly switch between clusters by using the kubectl config use-context command. Note: A file that is used to configure access to a cluster is sometimes called a kubeconfig file.
How do I change my master node name in Kubernetes?
Changing the node's name is not possible at the moment, it requires you to remove and rejoin the node. You need to make sure the hostname is changed to the new name, remove the node, reset it and rejoin it. Ideally you have removed the running pods on it.
How do I change my namespace in Kubernetes?
By default, the kubectl command-line tool interacts with the default namespace. If you want to use a different namespace, you can pass kubectl the --namespace flag. For example, kubectl --namespace=mystuff references objects in the mystuff namespace.
Where is kubectl config?
By default, kubectl looks for a file named config in the $HOME/. kube directory. You can specify other kubeconfig files by setting the KUBECONFIG environment variable or by setting the --kubeconfig flag.
How do you manage clusters?
Manage clustersView and monitor a cluster.Connect to the cluster.Terminate a cluster.Scaling cluster resources.Cloning a cluster using the console.Submit work to a cluster.Automate recurring clusters with AWS Data Pipeline.
How do I change node name?
To change the name of a cluster node:From the command line, enter smit sysmirror.Select Cluster Nodes and Networks > Manage Nodes > Network Interfaces > Change/Show a Node and press Enter. ... Make your selection and press Enter. ... Enter the new name for the node in the New Node Name field.More items...
How do you rename a node?
RENAME NODE (Rename a node)You cannot rename a NAS node name that has a corresponding data mover defined. If the data mover has defined paths, the paths must first be deleted.If a node is configured for replication, it cannot be renamed.
How do you name nodes in Kubernetes?
Add a label to a nodeList the nodes in your cluster, along with their labels: kubectl get nodes --show-labels. ... Choose one of your nodes, and add a label to it: kubectl label nodes
Can we rename namespace?
you can't rename a namespace. if it's only one object you can copy and rename it.
Can I change a namespace name?
Place your cursor in the namespace name. Press Ctrl+. to trigger the Quick Actions and Refactorings menu. Select Change namespace to
How do I change my default namespace?
Setting Default Namespace Namespace defaults are set in your cluster's context configuration. We change the default you will need to use the kubectl set-config command and specify the name of the namespace want to be used as default.
How do I list a Kubernetes cluster?
This command lists pods on the Kubernetes cluster....Kubectl create -f FILE.Kubectl apply -f FILE.Kubectl delete (-f FILE | TYPE [PREFIX_NAME | NAME])Kubectl port-forward POD [LOCAL_PORT:]REMOTE_PORT.Kubectl run NAME --image=image [--env=”key=value”] [--port=port] [--replicas=replicas]
How do I change the context of Kubernetes?
Utilize the command “kubectl config set-context my-context —cluster=my-app —namespace=production” to configure per-context parameters. This approach will build a new context named my-context with default Kubernetes cluster and namespace parameters.
How does cluster connect to kubectl?
Access from a node or pod in the cluster.Run a pod, and then connect to a shell in it using kubectl exec. Connect to other nodes, pods, and services from that shell.Some clusters may allow you to ssh to a node in the cluster. From there you may be able to access cluster services.
How do I edit Kubeconfig?
The command Edit kubeconfig can be invoked from the Kubernetes:Clusters view title context menu.Edit Kubeconfig command. Select Kubeconfig to open for editing.Swap Kubeconfig command. Prompts to select Kubeconfig to swap in from. ( ~/.kube/config is excluded from prompt) Prompts to select Kubeconfig ( ~/.
What is the meaning of "back up"?
Making statements based on opinion; back them up with references or personal experience.
Can you change a cluster name before an init stage?
Update: From version 1.12, kubeadm allow you to change a cluster name before an "init" stage .
Can you change the name of a cluster before init?
No, you cannot change a name of running cluster, because it serves for discovery inside a cluster and this would require near-simultaneous changing it across the cluster. Sadly, you also cannot change a name of the cluster before init. Here is the issue on Github.
Can you change the name of a Kubeadm cluster?
You can now do so using kubeadm's config file. PR here: No, you cannot change a name of running cluster, because it serves for discovery inside a cluster and this would require near-simultaneous changing it across the cluster. Sadly, you also cannot change a name of the cluster before init. Here is the issue on Github.
How to change Kubernetes cluster name?
You can change your kubernetes cluster name simply by editing kubeadm-config ConfigMap using following command:
What is the meaning of "back up"?
Making statements based on opinion; back them up with references or personal experience.
What happens after saving changes to a file?
After saving changes to the file you'll see confirmation of successful edit:
Can Kubectl be named differently?
From kubectl perspective your kubernetes cluster can be named totally differently than in kubeadm-config ConfigMap. They are configured independently. Actually in .kube/config file you can refer to your cluster by any name you want, but you need to make the change both in clusters as well as in contexts sections. Look at the example below:
Can you change the context name of a cluster?
You may also want to change your context name to reflect the current cluster name, but you don't have to . You can do it just for the sake of consistency:
How long does it take for rotten issues to close?
Rotten issues close after 30d of inactivity.
How do we do cluster upgrades?
We do cluster upgrades by creating a new cluster, moving traffic to it and after validating the new cluster works as expected we delete the old cluster.
Is it safe to upgrade a Kops cluster?
I think performing an in-place upgrade of a kops cluster node by node is not a great idea. If things go wrong, a complex roll-back is required. Bringing up a new cluster and switching over to it is far safer, particularly as it allows you to instantly switch back to the existing cluster at the first sign of trouble.
Can you upgrade a cluster twice?
One option for the use case of cluster upgrading would be to do the upgrade twice: cluster at foo.cluster.com needs upgrade, create new cluster tmp.cluster.com, blue/green, then when all good destroy the one at foo.cluster.com; create a new one again, this time with same name as old foo.cluster.com, using the exact same setup files as used for tmp, blue/green again (but probably doesn't need to be as thorough if everything identical), and finally retire tmp.
Can you clone a cluster foo2.cluster.com?
Another option might be to create a "clone" cluster foo2.cluster.com using the exact same setup as done for foo.cluster.com; blue/green just to confirm that everything is indeed identical; destroy foo.cluster.com; recreate it with upgraded kubernetes; thorough blue/green; switch the rest of traffic over to it; tear down foo2.
Is the name a fixable identifier?
Practically speaking no - the name serves as an identifier (which is fix able), but also serves for discovery (so this would require near-simultaneous changing across the cluster).
What is cluster administration overview?
The cluster administration overview is for anyone creating or administering a Kubernetes cluster. It assumes some familiarity with core Kubernetes concepts.
What is DNS integration?
DNS Integration describes how to resolve a DNS name directly to a Kubernetes service.
What is authorization in HTTP?
Authorization is separate from authentication, and controls how HTTP calls are handled.
Does Kubernetes support hybrid clusters?
Will your cluster be on-premises, or in the cloud (IaaS)? Kubernetes does not directly support hybrid clusters. Instead, you can set up multiple clusters.
sunnyanand17 commented on Jul 17, 2019
Hi, is it possible to get the cluster name as we get from the below Kubectl commands: kubectl config current-context --> output :: cluster-name-context
mkjmkumar commented on Jul 20, 2020
It seems that suggestion to use the HOST (master name) as cluster name. How are we going to handle this when we have multiple master nodes serving to cluster?
How to check if Kubectl is installed?
To check that kubectl is installed, run kubectl version -- client. The kubectl version should be within one minor version of your cluster's API server.
What is a Kubeconfig file?
Note: A file that is used to configure access to a cluster is sometimes called a kubeconfig file. This is a generic way of referring to configuration files. It does not mean that there is a file named kubeconfig. Warning: Only use kubeconfig files from trusted sources.
Where is Kubectl config?
If you already have a cluster, and you can use kubectl to interact with the cluster, then you probably have a file named config in the $HOME/.kube directory.
What is a fake CA file?
The fake-ca-file, fake-cert-file and fake-key-file above are the placeholders for the pathnames of the certificate files. You need to change these to the actual pathnames of certificate files in your environment.
What is the output of Kubeconfig?
The output shows merged information from all the files listed in your KUBECONFIG environment variable. In particular, notice that the merged information has the dev-ramp-up context from the config-demo-2 file and the three contexts from the config-demo file:
How many paths does Kubeconfig append?
Temporarily append two paths to your KUBECONFIG environment variable. For example:
What is a configuration file?
A configuration file describes clusters, users, and contexts. Your config-demo file has the framework to describe two clusters, two users, and three contexts.
