Container Orchestration with Kubernetes

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Kubernetes Hello World

A brief overview of various compute controllers in Kubernetes:

ReplicaSet: Ensures a specified number of replica Pods are running at all times.

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: my-replicaset
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-container
        image: my-image

Deployment: Manages the deployment and scaling of a set of Pods.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-deployment
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-container
        image: my-image

StatefulSet: Maintains a set of stateful Pods with stable network identities.

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: my-statefulset
spec:
  replicas: 3
  serviceName: "my-statefulset"
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-container
        image: my-image

Jobs: Manages the execution of a finite task or batch job.

apiVersion: batch/v1
kind: Job
metadata:
  name: my-job
spec:
  template:
    spec:
      containers:
      - name: my-container
        image: my-image
  backoffLimit: 4

CronJob: Runs Jobs on a repeating schedule.

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: my-cronjob
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: my-container
            image: my-image
  successfulJobsHistoryLimit: 3

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