kubernetes sample configurations

k8s-samples.yaml

# simple pv 

kind: PersistentVolume
apiVersion: v1
metadata:
  name: task-pv-volume
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/tmp/data"
    
  or:
  emptyDir: 
    path: "/blah"
    
----
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: task-pv-claim
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi
      
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: nginx-daemonset
spec:
  template:
    metadata:
      labels:
        app: test-app
    spec:
      containers:
        - name: nginx-daemonset
          image: nginx
          ports:
          - containerPort: 80
          
# simple pod with multiple containers
---
apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
spec:
  containers:
  - name: nginx
    image: nginx
  - name: redis 
    image: redis
    
# simple pod with init-container
---
apiVersion: v1
kind: Pod
metadata:
  name: init-demo
spec:
  containers:
  - name: checker
    image: busybox
    command: ['sh', "-c", "if /usr/dir/<file> does not exist...exit" ]
    volumeMounts:
    - name: workdir
      mountPath: /usr/workdir
  # These containers are run during pod initialization
  initContainers:
  - name: touch
    image: busybox
    command: ['sh', "-c", "touch /workdir/file.txt;" ]
    volumeMounts:
    - name: workdir
      mountPath: "/workdir"
  dnsPolicy: Default
  volumes:
  - name: workdir
    emptyDir: {}
    
# deployment with 2 replicas
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: my-nginx
spec:
  replicas: 2
  template:
    metadata:
      labels:
        run: my-nginx
    spec:
      containers:
      - name: my-nginx
        image: nginx
        ports:
        - containerPort: 80
        
# then run kubectl expose deployment/my-nginx to create the service


---
apiVersion: batch/v1
kind: Job
metadata:
  name: printer
spec:
  completions: 4
  parallelism: 2
  template:
    metadata:
      name: printer
    spec:
      containers:
      - name: printer
        image: busybox
        command: ["sh",  "-c", "echo 'hello'"]
      restartPolicy: Never
      
# then run kubectl get pods --show-all | grep printer