Kubernetes, explained by example.

Example 1

apiVersion: v1

kind: Pod

metadata:

  name: hello-world

  namespace: kassel-code-meetup

  labels:

      app: hello-world

spec:

  containers:

    - name: hello-world

      image: nginxdemos/hello:0.2

      ports:

        - name: http

          containerPort: 80

Example 2

apiVersion: v1

kind: Service

metadata:

  name: hello-world

  namespace: kassel-code-meetup

spec:

  selector:

    app: hello-world

  ports:

    - name: http

      port: 80

      targetPort: 80

Example 3

apiVersion: networking.k8s.io/v1

kind: Ingress

metadata:

  name: hello-world

  namespace: kassel-code-meetup

  annotations:

    nginx.ingress.kubernetes.io/ssl-redirect: "false"

spec:

  ingressClassName: nginx

  rules:

    - host: hello.biller.cloud

      http:

        paths:

          - path: /

            pathType: Prefix

            backend:

              service:

                name: hello-world

                port:

                  number: 80

Example 4

apiVersion: apps/v1

kind: ReplicaSet

metadata:

  name: hello-world

  namespace: kassel-code-meetup

spec:

  replicas: 5

  selector:

    matchLabels:

      app: hello-world

  template:

    metadata:

      labels:

        app: hello-world

    spec:

      containers:

        - name: hello-world

          image: nginxdemos/hello:0.2

          ports:

            - name: http

              containerPort: 80

Example 5

apiVersion: apps/v1

kind: Deployment

metadata:

  name: hello-world

  namespace: kassel-code-meetup

spec:

  replicas: 10

  selector:

    matchLabels:

      app: hello-world

  template:

    metadata:

      labels:

        app: hello-world

    spec:

      containers:

        - name: hello-world

          image: nginxdemos/hello:0.2

          ports:

            - name: http

              containerPort: 80

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxSurge: 0

      maxUnavailable: 20%

Transcript

1. Kubernetes, explained By EXAMPLE. Waldemar Biller Kassel Code Meetup #22 26/10/2022 #kc 22 #kc 22
2. What are your challenges in using/deploying containers?
3. & Complexity Cultural Changes according to CNCF Survey 2020 https://www.cncf.io/wp-content/uploads/2020/11/CNCF_Survey_Report_2020.pdf
4. First Things, First! You don’t have to use everything Kubernetes has to offer Prefer managed over self-hosted Kubernetes Gradually build up your environment, one tool at a time