sample-scheduler-extender

A sample to showcase how to create a k8s scheduler extender.

UPDATE on 2020.6.10

Switch go module, and wire dependencies to k8s.io/*:v0.18.3.

For a fresh cloned repo, run go mod vendor and go build -o main *.go to compile the main binary.

[TODO] Running with a Kubeadm env

[TODO] Running with a hack-local env (for dev)

Make following changes on hack/local-up-cluster.sh

diff --git a/hack/local-up-cluster.sh b/hack/local-up-cluster.sh
index 8a59190..8dbec17 100755
--- a/hack/local-up-cluster.sh
+++ b/hack/local-up-cluster.sh
@@ -834,7 +834,7 @@ function start_kubescheduler {
     ${CONTROLPLANE_SUDO} "${GO_OUT}/hyperkube" scheduler \
       --v=${LOG_LEVEL} \
       --leader-elect=false \
-      --kubeconfig "${CERT_DIR}"/scheduler.kubeconfig \
+      --config /root/config/scheduler-config.yaml \
       --feature-gates="${FEATURE_GATES}" \
       --master="https://${API_HOST}:${API_SECURE_PORT}" >"${SCHEDULER_LOG}" 2>&1 &
     SCHEDULER_PID=$!

Notes

Prioritize webhook won't be triggered if it's running on an one-node cluster. As it makes no sense to run priorities logic when there is only one candidate:

// from k8s.io/kubernetes/pkg/scheduler/core/generic_scheduler.go
func (g *genericScheduler) Schedule(pod *v1.Pod, nodeLister algorithm.NodeLister) (string, error) {
    ...
	// When only one node after predicate, just use it.
	if len(filteredNodes) == 1 {
		metrics.SchedulingAlgorithmPriorityEvaluationDuration.Observe(metrics.SinceInMicroseconds(startPriorityEvalTime))
		return filteredNodes[0].Name, nil
    }
    ...
}

You might also like...

cpuworker - A Customized Goroutine Scheduler over Golang Runtime

cpuworker Status Working in process. Run the Demo Make sure the GOMAXPROCS is bigger than 1 and there is at least GOMAXPROCS physical OS threads avail

143 Dec 6, 2022

goInterLock is golang job/task scheduler with distributed locking mechanism (by Using Redis🔒).

goInterLock is golang job/task scheduler with distributed locking mechanism. In distributed system locking is preventing task been executed in every instant that has the scheduler,

29 Dec 5, 2022

Chadburn is a scheduler alternative to cron, built on Go and designed for Docker environments.

Chadburn - a job scheduler Chadburn is a modern and low footprint job scheduler for docker environments, written in Go. Chadburn aims to be a replacem

56 Dec 6, 2022

A Framework for FaaS load balancing | stack-scheduler repository|

P2PFaaS A Framework for FaaS load balancing | stack-scheduler repository Introduction The P2PFaaS is a framework that allows you to implement a load b

0 Oct 29, 2021

Go distributed task scheduler

1 Nov 13, 2021

Scheduler CRUD For Golang

scheduler-CRUD 從dbdiagram.io建立table與create語法在mysql建立table 以sqlc建CRUD function與Transaction 加入viper讀環境變量以gin開發REST API 加入Dockerfile docker build -t th

0 Feb 10, 2022

Scheduler: Go jobs execution system

Scheduler Go jobs execution system. Inspired by CI/CD and Unity task scheduler.

13 Jul 1, 2022

personal tweet scheduler - it needs my guidance now for it to work for you - it works on my mac - will release it someday

tit tit daemon write tests automate build & install plist replace {{path_for_titd_executable}} accordingly. ?xml version="1.0" encoding="UTF-8"? !D

0 Feb 4, 2022

K8s cluster simulator for workload scheduling.

Open-Simulator Motivation 概念定义 Open-Simulator 是 K8s 下的仿真调度组件。用户准备一批待创建 Workload 资源，Workload 资源指定好资源配额、绑核规则、亲和性规则、优先级等，通过 Open-Simulator 的仿真调度能力可判断当前集群