Another Scheduler is a Kubernetes controller that automatically starts, stops, or restarts pods from a deployment at a specified time using a cron annotation.

Last update: Nov 19, 2022

Overview

Another Scheduler

Another Scheduler is a Kubernetes controller that automatically starts, stops, or restarts pods from a deployment at a specified time using a cron syntax.

Another Scheduler read the annotation of each deployment and performs an increase or decrease in the number of replicas.

The date and time must be in UTC.

The restart feature execute a rollout restart deployment.

Use cases

Deployments with GPU, stop them after working hours.
Stop deployments that are not needed on the weekend.
Save some money in your Kubernetes cluster after working hours or weekends.
Another Scheduler is a perfect combination with Cluster Autoscaler.

Install

# Deploy Another Scheduler into Kubernetes on default namespace
kubectl apply -f https://raw.githubusercontent.com/dignajar/another-scheduler/master/kubernetes/full.yaml

Annotations

Stop pods at 6pm every day:

another-scheduler.io/stop-time: "00 18 * * *"

Start pods at 1pm every day:

another-scheduler.io/start-time: "00 13 * * *"

Start 3 pods at 2:30pm every day:

another-scheduler.io/start-time: "30 14 * * *"
another-scheduler.io/start-replicas: "3"

Restart pods at 9:15am every day:

another-scheduler.io/restart-time: "15 09 * * *"

Restart pods at 2:30am, only on Saturday and Sunday:

another-scheduler.io/restart-time: "00 02 * * 0,6"

Example: How to start pods at 2pm and stop them at 3pm every day

The following example start 5 replicas in total at 2pm and stop 4 of them at 3pm every day, the deployment start with 0 replicas.

The start-replicas is not incremental, the value is the number of replicas will be setup by Another Scheduler at the defined time by start-time.

The date and time must be in UTC.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  labels:
    app: nginx
  annotations:
    another-scheduler.io/start-time: "00 14 * * *"
    another-scheduler.io/start-replicas: "5"
    another-scheduler.io/stop-time: "00 15 * * *"
    another-scheduler.io/stop-replicas: "1"
spec:
  replicas: 0
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80

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Comments

Refactor code and allow cronjob suspention

I've implemented cronjob logic for enable and suspend them on start and stop time.

A lot of code refactor also is included.

I am already using this logic, and it may useful upstream.

opened by margori 0

Support annotations errors

If there is an error in an annotation, service stops completely.

'another-autoscaler/stop-time': '1-59/2 * * *' <- missing last column
'another-autoscaler/stop-replicas': '' <- empty string is not an integer

opened by margori 1

Releases(0.7)

0.7(Nov 29, 2021)
Update Python to v3.9.9

Update Alpine to the latest v3.14, includes security bug fixes

Source code(tar.gz)
Source code(zip)
0.6(Oct 5, 2021)
Display exception messages in logs

Source code(tar.gz)
Source code(zip)
0.5(Oct 5, 2021)
Update Python 3.9.7

Rename annotations from another-autoscaler.io to another-autoscaler

Add ApiException to catch exceptions from K8s API

K8s manifests add namespace another and deploy Another Autoscaler in this new namespace

Source code(tar.gz)
Source code(zip)
0.4(Aug 12, 2021)
This release is for migration from Docker Hub registry to Github registry.

Add to the Github actions > Scan vulnerabilities with Trivy

Add to the Github actions > Build Docker image

Add Deepsource for code review

K8s manifest, Image runs as non-root uid 10001 and gid 10001.

K8s manifest, create namespace another

Source code(tar.gz)
Source code(zip)
0.3(Jul 12, 2021)
Project rename to Another Autoscaler.

Environment variable (CHECK_EVERY) to configure the number of seconds of each run; By default is 5 seconds.

Update ClusterRoleBinding API version to rbac.authorization.k8s.io/v1 on K8s manifest.

Refactor of the class AAutoscaler to improve readability.

Source code(tar.gz)
Source code(zip)
0.2(Jun 23, 2021)

Source code(tar.gz)
Source code(zip)
0.1(Jun 22, 2021)

Source code(tar.gz)
Source code(zip)

Another Scheduler is a Kubernetes controller that automatically starts, stops, or restarts pods from a deployment at a specified time using a cron annotation.

Related tags

Overview

Another Scheduler

Use cases

Install

Annotations

Example: How to start pods at 2pm and stop them at 3pm every day

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Comments

Refactor code and allow cronjob suspention

Support annotations errors

Releases(0.7)

0.7(Nov 29, 2021)

0.6(Oct 5, 2021)

0.5(Oct 5, 2021)

0.4(Aug 12, 2021)

0.3(Jul 12, 2021)

0.2(Jun 23, 2021)

0.1(Jun 22, 2021)

Owner

Diego Najar

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