Table of contents

kubernetes yaml files

general

multiple definitions in one yaml file with ---

apiVersion: v1
kind: Pod
metadata:
    name: bb
spec:
  containers:
  - image: busybox
    name: busybox
---
apiVersion: v1
kind: Pod
metadata:
    name: ub
spec:
  containers:
  - image: ubuntu
    name: ubuntu

pods

hello world

apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
    - name: mycontainer
      image: nginx

custom command for container

spec:
  containers:
    - name: mycontainer
      image: ubuntu
      command: ["sleep"]
      args: ["infinity"]

passing a command to the shell

spec:
  containers:
    - name: mycontainer
      image: busybox
      command:
      - sh
      - -c
      - 'echo "foo bar" > /dev/termination-log; exit 55'

setting a label

metadata:
    name: bb
    labels:
      foo: bar
      multipod: "false"

setting the restart policy

spec:
  restartPolicy: OnFailure

setting environment variables

spec:
  containers:
  - image: busybox
    name: mycontainer
    env:
    - name: MYVAR1
      value: MYVAL1
    - name: MYVAR2
      value: MYVAL2
    command: ["echo"]
    args: ["$(MYVAR1) - $(MYVAR2)"]

use configmap as environment variables

spec:
  restartPolicy: OnFailure
  containers:
  - image: busybox
    name: mycontainer
    command: ["echo"]
    args: ["$(a) - $(b)"]
    envFrom:
      - configMapRef:
          name: myconfigmap

use a secret as an environment variable

spec:
  containers:
  - image: busybox
    name: mycontainer
    env:
    - name: POPA
      valueFrom:
        secretKeyRef:
          name: postgres
          key:  password

mounting a directory as a volume

spec:
  containers:
    - name: mycontainer
      image: ubuntu
      command: ["sleep"]
      args: ["infinity"]
      volumeMounts:
      - mountPath: /vol/myvol
        name: myvolume
  volumes:
  - name: myvolume
    hostPath:
      path: /tmp/myvol
      type: Directory

specifying a node to run a pod on with a label

spec:
  containers:
    - name: [container]
      image: [image]
  nodeSelector:
    node-pool: int

adding a toleration for a taint

spec:
  containers:
    - name: [container]
      image: [image]
  tolerations:
  - key: "key"
    operator: "Equal"
    value: "int"
    effect: "NoExecute"

configmap

apiVersion: v1
kind: ConfigMap
metadata:
  name: myconfig
data:
  entry1: "one"
  entry2: "two"

replication controller

apiVersion: v1
kind: ReplicationController
metadata:
  name: myrc
spec:
  replicas: 3
  selector:
    mylabel: myvalue
  template:
    metadata:
      name: myrcpod
      labels:
        mylabel: myvalue
    spec:
      containers:
      - name: nginx
        image: nginx

services

apiVersion: v1
kind: Service
metadata:
  name: mysvc
spec:
  selector:
    mysvc: mypod
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
---
apiVersion: v1
kind: Pod
metadata:
  name: httpd
  labels:
    mysvc: mypod
spec:
  containers:
  - image: httpd
    name: mycontainer