ShellHacks

A context in Kubernetes is basically a combination of an information about clusters and users, stored in a kubeconfig file.

Every time you execute the kubectl command, you reference a context inside kubeconfig.

The kubectl config command is used to manage Kubernetes configurations, primarily by editing the kubeconfig file.

In this short note I will show how to delete a Kubernetes context, cluster or user from kubeconfig using the kubectl config command. (more…)

Kubernetes automatically spreads Pods for workload resources (such as Deployment, StatefulSet, etc.) across different Nodes to reduce the impact of failures.

In a multi-zone (multi-region) Kubernetes cluster it is required to ensure that Kubernetes will place the replicas of a Pod on the Nodes in different zones, to reduce the impact of zone failures.

In this note I will show how to distribute Kubernetes Pod replicas evenly on Nodes in different zones using topologySpreadConstraints. (more…)

Labels in Kubernetes are used for attaching meta tags to different resources, including nodes.

This helps to organize the nodes and allows to select specific subsets of nodes.

By adding labels to Kubernetes nodes, we can have more control over the resources that we create.

For example, we can make Kubernetes to schedule specific deployments onto nodes with the specific labels only.

In this post I will show how to get, add, overwrite and delete labels from Kubernetes nodes using the kubectl command. (more…)