kube-fledged

kube-fledged is a kubernetes operator for creating and managing a cache of container images directly on the worker nodes of a kubernetes cluster. It allows a user to define a list of images and onto which worker nodes those images should be cached (i.e. pulled). As a result, application pods start almost instantly, since the images need not be pulled from the registry.

kube-fledged provides CRUD APIs to manage the lifecycle of the image cache, and supports several configurable parameters to customize the functioning as per one’s needs.

This article is about how to use Helm to install kube-fledged on Kubernetes (K8S).

growpart and resize2fs to extend disk size

Alibaba CLoud Elastic Compute Service (ECS) is a high-performance, stable, reliable, and scalable IaaS-level service provided by Alibaba Cloud. ECS eliminates the need for upfront investments in IT hardware and allows you to scale computing resources on demand. This makes ECS instances more convenient and efficient than physical servers. ECS provides a variety of instance types that suit various business needs and helps boost business growth.

This article provides instructions on how to use tools such as growpart and resize2fs to extend the partition and file system of the Linux system disk.

Configuring concurrency

Concurrency determines the number of simultaneous requests that can be processed by each replica of an application at any given time.

Configuring scale bounds

You can configure upper and lower bounds to control autoscaling behavior.

You can also specify the initial scale that a Revision is scaled to immediately after creation. This can be a default configuration for all Revisions, or for a specific Revision using an annotation.

Metrics

The metric configuration defines which metric type is watched by the Autoscaler.

Targets

Configuring a target provide the Autoscaler with a value that it tries to maintain for the configured metric for a revision. See the metrics - https://knative.dev/docs/serving/autoscaling/autoscaling-metrics/ documentation for more information about configurable metric types.

Configuring the requests per second (RPS) target

This setting specifies a target for requests-per-second per replica of an application.

Supported Autoscaler types

Knative Serving supports the implementation of Knative Pod Autoscaler (KPA) and Kubernetes’ Horizontal Pod Autoscaler (HPA). This topic lists the features and limitations of each of these Autoscalers, as well as how to configure them.

Velero

Velero is an open source tool to safely backup and restore, perform disaster recovery, and migrate Kubernetes cluster resources and persistent volumes.

This article is about how to use Helm to install Velero on Kubernetes (K8S).

Istio

Istio is the simplify observability, traffic management, security, and policy with the leading service mesh

Istio addresses the challenges developers and operators face with a distributed or microservices architecture. Whether you’re building from scratch or migrating existing applications to cloud native, Istio can help.

This article is about how to use Pulumi, kubernetes (K8S) provider, Helm Chart and TypeScript SDK to deploy Istio within Kubernetes (K8S).