Sunday, March 3, 2019

Kubernetes cheat sheet 1

https://kubernetes.io/docs/reference/kubectl/cheatsheet/

alias k=kubectl

PODS


https://kubernetes.io/docs/concepts/workloads/pods/pod-overview/

kubectl run nginx --image=nginx


kubectl create -f nginx.yml


apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
spec:
  containers:
    - name: nginx-container
      image: nginx


kubectl describe pods nginx-pod


kubectl get pods -o wide

kubectl edit pod nginx-pod

kubectl delete pod nginx-pod


kubectl get pod pod-name -o yaml > pod-definition.yaml

Replication Controller


kubectl create -f rc-definition.yml

apiVersion: v1
kind: ReplicationController
metadata:
  name: nginx
  spec:
    replicas: 3
    selector:
      app: nginx
    template:
      metadata:
        name: nginx
        labels:
          app: nginx
      spec:
        containers:
          - name: nginx
            image: nginx
            ports:
              - containerPort: 80

kubectl get rc


Replica Set


kubectl create -f rs-definition.yml

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: frontend
  labels:
    app: guestbook
    tier: frontend
spec:
# modify replicas according to your case
  replicas: 3
  selector:
    matchLabels:
      tier: frontend
  template:
    metadata:
      labels:
      tier: frontend
    spec:
      containers:
        - name: php-redis
          image: gcr.io/google_samples/gb-frontend:v3

kubectl get replicaset

kubectl describe replicaset

kubectl replace

kubectl scale --replicas=3 rs/myrs

kubectl get rs myrs -o yaml


Deployments


https://kubernetes.io/docs/concepts/workloads/controllers/deployment/

kubectl create -f mydeployment.yml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
  spec:
    replicas: 3
    selector:
      matchLabels:
        app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:1.7.9
          ports:
            - containerPort: 80

kubectl get all






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