When using the kubelet's --config-dir flag to specify a drop-in directory for configuration, there is some specific behavior on how different types are merged. Here are some examples of how different data types behave during configuration merging: Structure Fields There are two types of structure fields in a YAML structure: singular (or a scalar type) and embedded (structures that contain scalar types). The configuration merging process handles the overriding of singular and embedded struct fields to create a resulting kubelet configuration.

Production-Grade Container Orchestration

Detailed explanation of Pressure Stall Information (PSI) metrics and how to use them to identify resource pressure in Kubernetes.

If you configure a Service, you can select from any network protocol that Kubernetes supports. Kubernetes supports the following protocols with Services: SCTP TCP (the default) UDP When you define a Service, you can also specify the application protocol that it uses. This document details some special cases, all of them typically using TCP as a transport protocol: HTTP and HTTPS PROXY protocol TLS termination at the load balancer Supported protocols There are 3 valid values for the protocol of a port for a Service:

kubectl is the Kubernetes cli version of a swiss army knife, and can do many things. While this Book is focused on using kubectl to declaratively manage applications in Kubernetes, it also covers other kubectl functions. Command Families Most kubectl commands typically fall into one of a few categories: Type Used For Description Declarative Resource Management Deployment and operations (e.g. GitOps) Declaratively manage Kubernetes workloads using resource configuration Imperative Resource Management Development Only Run commands to manage Kubernetes workloads using Command Line arguments and flags Printing Workload State Debugging Print information about workloads Interacting with Containers Debugging Exec, attach, cp, logs Cluster Management Cluster operations Drain and cordon Nodes Declarative Application Management The preferred approach for managing resources is through declarative files called resource configuration used with the kubectl Apply command.

Production-Grade Container Orchestration

Synopsis Create a secret with specified type. A docker-registry type secret is for accessing a container registry. A generic type secret indicate an Opaque secret type. A tls type secret holds TLS certificate and its associated key. kubectl create secret (docker-registry | generic | tls) Options -h, --help help for secret Parent Options Inherited --as string Username to impersonate for the operation. User could be a regular user or a service account in a namespace.

Synopsis Create a secret based on a file, directory, or specified literal value. A single secret may package one or more key/value pairs. When creating a secret based on a file, the key will default to the basename of the file, and the value will default to the file content. If the basename is an invalid key or you wish to chose your own, you may specify an alternate key.

This page contains list of feature gates that have been removed. The information on this page is for reference. A removed feature gate is different from a GA'ed or deprecated one in that a removed one is no longer recognized as a valid feature gate. However, a GA'ed or a deprecated feature gate is still recognized by the corresponding Kubernetes components although they are unable to cause any behavior differences in a cluster.

Resource Types KubeProxyConfiguration FormatOptions Appears in: LoggingConfiguration FormatOptions contains options for the different logging formats. FieldDescription text [Required] TextOptions [Alpha] Text contains options for logging format "text". Only available when the LoggingAlphaOptions feature gate is enabled. json [Required] JSONOptions [Alpha] JSON contains options for logging format "json". Only available when the LoggingAlphaOptions feature gate is enabled. JSONOptions Appears in: FormatOptions JSONOptions contains options for logging format "json". FieldDescription OutputRoutingOptions [Required] OutputRoutingOptions (Members of OutputRoutingOptions are embedded into this type.