kubernetes pod sample files

simple nginx pod

apiVersion: v1

kind: Pod

metadata:

    name: nginx-pod

    labels:

        app: nginx

        tier: dev

spec:

    containers:

        - name: nginx-container

          image: nginx

multiple containers in one pod

apiVersion: v1

kind: Pod

metadata:

  name: nginx-caching-server

  labels:

    purpose: demonstrate-multi-container-pod

spec:

  containers:

  - name: nginx-container1

    image: nginx

  - name: busybox-container2

    image: busybox

    command:

      - sleep

      - "3600"

replica controller

apiVersion: v1

kind: ReplicationController

metadata:

  name: nginx-rc

spec:

  replicas: 3

  template:

    metadata:

      name: nginx-pod

      labels:

        app: nginx-app

    spec:

      containers:

      - name: nginx-container

        image: nginx

        ports:

        - containerPort: 80

  selector:

    app: nginx-app

replica set

apiVersion: apps/v1

kind: ReplicaSet

metadata:

  name: nginx-rs

spec:

  replicas: 3

  template:

    metadata:

      name: nginx-pod

      labels:

        app: nginx-app

        tier: frontend

    spec:

      containers:

      - name: nginx-container

        image: nginx

        ports:

        - containerPort: 80

  selector:

    matchLabels:

      app: nginx-app

    matchExpressions:

      - {key: tier, operator: In, values: [frontend]}

daemon set

daemon set guarantee to up and run one instance in every node

apiVersion: apps/v1

kind: DaemonSet

metadata:

  name: fluentd-ds

spec:

  template:

    metadata:

      labels:

        name: fluentd

    spec:

      containers:

      - name: fluentd

        image: gcr.io/google-containers/fluentd-elasticsearch:1.20

  selector:

    matchLabels:

      name: fluentd

up and run pods for special nodes only using daemon set(diskType=ssd)

apiVersion: apps/v1

kind: DaemonSet

metadata:

  name: nginx-ds

spec:

  template:

    metadata:

      labels:

        name: nginx

    spec:

      containers:

      - name: nginx-container

        image: nginx

      nodeSelector:

        disktype: ssd

  selector:

    matchLabels:

      name: nginx

batch execution pod. it will print 9 to 1 when execution.

apiVersion: batch/v1

kind: Job

metadata:

  name: countdown

spec:

  template:

    metadata:

      name: countdown

    spec:

      containers:

      - name: counter

        image: centos:7

        command:

         - "bin/bash"

         - "-c"

         - "for i in 9 8 7 6 5 4 3 2 1 ; do echo $i ; done"

      restartPolicy: Never

nginx deployment pod

apiVersion: apps/v1

kind: Deployment

metadata:

  name: nginx-deploy

  labels:

    app: nginx-app

spec:

  replicas: 3

  template:

    metadata:

      labels:

        app: nginx-app

    spec:

      containers:

      - name: nginx-container

        image: nginx

        ports:

        - containerPort: 80

  selector:

    matchLabels:

      app: nginx-app

redis deployment using Recreate

In "Recreate", it will terminate all containers at once and restart required containers.

apiVersion: apps/v1

kind: Deployment

metadata:

  name: redis-deployment

  labels:

    app: redis

spec:

  replicas: 10

  selector:

    matchLabels:

      app: redis

  strategy:

    type: Recreate

  template:

    metadata:

      labels:

        app: redis

    spec:

      containers:

        - name: redis-container

          image: redis:5.0

redis deployment using RollingUpdate

in "RollingUpdate", requested number of containers will be updated.

new instance will up and old instance will down in this scenario.

apiVersion: apps/v1

kind: Deployment

metadata:

  name: redis-deployment

  labels:

    app: redis

spec:

  replicas: 15

  selector:

    matchLabels:

      app: redis

  strategy:

    type: RollingUpdate

    rollingUpdate:

      maxSurge: 2

      maxUnavailable: 2

  minReadySeconds: 10

  template:

    metadata:

      labels:

        app: redis

    spec:

      containers:

        - name: redis-container

          image: redis:6.0 #Upgrade to 6.0 --> 6.0.16 --> 6.2.6

volume usage

when using volume, it can replicate to every containers config in pod file

apiVersion: v1

kind: Pod

metadata:

  name: sidecar-pod

spec:

  volumes:

  - name: logs

    emptyDir: {}

  containers:

  - name: app-container

    image: alpine

    command: ["/bin/sh"]

    args: ["-c", "while true; do date >> /var/log/app.log; sleep 5; done"]

    volumeMounts:

    - name: logs

      mountPath: /var/log

     

  - name: log-exporter-sidecar

    image: nginx

    ports:

      - containerPort: 80

    volumeMounts:

    - name: logs

      mountPath: /usr/share/nginx/html

volume "emptyDir" usage

apiVersion: v1

kind: Pod

metadata:

  name: nginx-emptydir

spec:

  containers:

  - name: nginx-container

    image: nginx

    volumeMounts:

    - name: test-vol

      mountPath: /test-mnt

  volumes:

  - name: test-vol

    emptyDir: {}

nginx deploymnet with 2 replicas

apiVersion: apps/v1

kind: Deployment

metadata:

  name: nginx-deployment

spec:

  selector:

    matchLabels:

      app: nginx

  replicas: 2 # tells deployment to run 2 pods matching the template

  template:

    metadata:

      labels:

        app: nginx

    spec:

      containers:

      - name: nginx

        image: nginx:1.14.2

        ports:

        - containerPort: 80