Kubernetes Cheat Sheet

_kafka_cheat_sheets.md

Following the kubernets cheat sheets, including minikube, kubectl and definition files

a_kubectl-commands.md

To show nodes

kubectl get nodesfa

To create a pod with nginx image

kubectl run nginx --image=nginx

To show pods

kubectl get pods

To describe pods

kubectl describe pods

To describe specific pod

kubectl describe pod pod-name

To show pods to show additional fields in pods

kubectl get pods -o wide

To create a POD with a file configuration

kubectl create -f pod-definition.yml

To see replication controller created

kubectl get replicationcontroller

To list replicaset that was created

kubectl get replicaset

Describe replica set

kubectl describe replicasets
kubectl describe replicaset replicaset_name

To replace or update yml

kubectl replace -f rs-definition.yml

To scale pods

kubectl scale --replicas=6 -f rs-definition.yml
kubectl scale --replicas=6 replicaset myapp

To delete replicaset

kubectl delete replicaset myapp

To get all objects in kubernetes

kubectl get all

To get deployments

kubectl get deployments

To describe deployments

kubectl describe deployments

To get status of rollout deployment

kubectl rollout status deployment/myapp-deployment

To get history of rollouts

kubectl rollout history deployment/myapp-deployment

To upgrade deployment - new rollout will be created

kubectl apply -f deployment-definition.yml

To upgrade image from deployment definition. Be careful with this command

kubectl set image deployment/myapp-deployment \ nginx:

To rollback upgrade

kubectl rollout undo deployment/myapp-deployment 

To list namespaces

kubectl get ns 

To describe namespaces

kubectl describe ns 

To show namespaces in yaml file

kubectl get ns default -o yaml  

a_minikube-commands.md

To initialize minikube cluster

minikube start

To stop minikube

minikube stop

Delete the local Minikube cluster:

minikube delete

To add nodes to minikube cluster

minikube node add

To create service

kubectl create -f service-definition.yml

k_deployment-definition.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deployment
  labels:
    app: myapp
    type: front-end
spec:
  template:
    metadata: # The data about the objects
      name: myapp-pod
      labels:
        app: myapp
        type: front-end

    spec: # This is additional information to kubernetes
      containers:
        - name: nginx-container
          image: nginx
  replicas: 3
  selector:
    matchLabels:
      app: myapp

k_pod-definition.yml

apiVersion: v1 # The version of Kubernetes API to using to create objects
kind: Pod # The type of object that will be create
metadata: # The data about the objects 
  name: myapp-pod
  labels:
    app: myapp
    type: front-end

spec: # This is additional information to kubernetes
  containers:
    - name: nginx-container
      image: nginx

k_rc-definition.yml

# deprecated prefer use replicaset instead
apiVersion: v1 
kind: ReplicationController
metadata:
  name: myapp-rc
  labels: 
    app: myapp
    type: frontend
spec:
  template:
    metadata: # The data about the objects 
      name: myapp-pod
      labels:
        app: myapp
        type: front-end

      spec: # This is additional information to kubernetes
        containers:
          - name: nginx-container
            image: nginx
 replicas: 3

k_replicaset-definition.yml

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: myapp
spec:
  template:
    metadata: # The data about the objects
      name: myapp-pod
      labels:
        app: myapp
        type: front-end

    spec: # This is additional information to kubernetes
      containers:
        - name: nginx-container
          image: nginx
  replicas: 3
  selector:
    matchLabels:
      type: front-end

k_service_definition.yml

apiVersion: v1
kind: Service
metadata:
  name: myapp-services

spec: 
  type: NodePort
  ports:
    - targetPort: 80
      port: 80
      nodePort: 30008
  selector: 
    app: myapp