kube-batch による Gang Scheduling #k8sjp / Kubernetes Invitational Meetup Tokyo 4th
Kubernetes Invitational Meetup Tokyo #4 で使用したスライドです。 複数の Pod が通信し合って実行を進めるような Job をデプロイする場合、一部の Pod だけが先に配置された状態で Node のリソースを使い切ってしまうと、後続の Pod が配置できずにデッドロックに陥ることがあります。 これを防ぐため、特定のグループに属する Pod を一度に全て配置するか、あるいは全て Pending のまま留めるかという All of Nothing の配置戦略を Gand Scheduling あるいは CoScheduling と呼びます。 今回紹介した kube-batch は Gang Scheduling を実現する特殊スケジューラの一種です。Gang Scheduling 以外にも、複数のキューを定義してクラスタのリソースをキュー間で均等に配分
How to write a custom Kubernetes scheduler using your monitoring metrics
This article covers the use case of creating a custom Kubernetes scheduler and implements an example using monitoring metrics coming from Sysdig: system, network, services, statsd, JMX or Prometheus metrics. UPDATE: There is a new and more complete implementation of the custom Kubernetes scheduler using Golang. The default Kubernetes scheduler does a fantastic job for most typical workloads. Start
Scheduling and Resource Management in Kubernetes
Effective management of shared resources (CPU, memory, etc.) is critical to achieving high utilization and strong isolation in shared clusters. This talk will describe the Kubernetes features that allow you to simultaneously achieve your utilization, isolation, and availability goals. We will also examine the new features in Kubernetes 1.6 that give you fine-grained control over placement of your
How does the Kubernetes scheduler work?
Hello! We talked about Kubernetes’ overall architecture a while back. This week I learned a few more things about how the Kubernetes scheduler works so I wanted to share! This kind of gets into the weeds of how the scheduler works exactly. It’s also an illustration of how to go from “how is this system even designed I don’t know anything about it?” to “okay I think I understand the basic design de
CronJob
A CronJob creates Jobs on a repeating schedule. CronJob is meant for performing regular scheduled actions such as backups, report generation, and so on. One CronJob object is like one line of a crontab (cron table) file on a Unix system. It runs a job periodically on a given schedule, written in Cron format. CronJobs have limitations and idiosyncrasies. For example, in certain circumstances, a sin
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