kube-workload-restarter

kube-workload-restarter is a small utility to be deployed in your Kubernetes namespace that is able to restart your workloads based on some conditions.

Workloads

When we talk about workloads we are referring to the following resources:

• Deployment
• StatefulSet
• DaemonSet
• Job & CronJob

Even if the idea behind kube-workload-restarter could be applied to all of these resources, currently only Deployment workloads are supported.

Install

To install kube-workload-restarter in your namespace you can use Helm:

helm repo add kube-workload-restarter https://andreacioni.github.io/kube-workload-restarter/

helm install kube-workload-restarter kube-workload-restarter/kube-workload-restarter --version <latest_version_here>

How to use it

kube-workload-restarter works by checking restart conditions by checking annotations on Deployments.

Currently supported annotations are:

• restarter/after: specify after how much time your workload will be restarted
• restarter/when: in addition to restarter/after you can specify when a restart should happen. This annotation alone has no effect.

You can set this annotaions on your own Deployment as shown below:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  annotations:
    "restarter/after": "10d"
    "restarter/when": "* 2-3 * * 3"
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:1.14.2
          ports:
            - containerPort: 80

Build

docker build -t andreacioni/kube-workload-restarter:latest .

References:

• Medium