joshy91

#!/bin/bash
kubectl get daemonsets -n kube-system
kubectl describe daemonset kube-flannel-ds -n kube-system

echo “apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: chippy
  labels:
    daemon: “yup”

joshy91

#!/bin/bash

#Status of pods where app=nginx
kubectl get pods -l app=nginx

#Give an nginx pod a label “test=sure”
kubectl label pod nginx-deployment-6fdbb596db-2s2tp test=sure

#Detailed description of pod with label “test=sure”
kubectl describe pod -l test=sure

joshy91

#!/bin/bash
#Replication Controller and Replica Set yamls

#A replication controller is a precusor to a deployment
echo “apiVersion: v1
kind: ReplicationController
metadata:
  name: nginx
spec:
  replicas: 3

joshy91

#!/bin/bash
#Self Healing

#Nginx deployment yaml created in previous script
kubectl create -f nginx-deployment.yaml

#Check status of pods; including replicas
kubectl get pods

#Delete indicated pod within nginx deployment

joshy91

#!/bin/bash
#Manually scaling an application through yaml and cml

#Nginx deployment yaml created in previous script
kubectl create -f nginx-deployment.yaml

#Detailed status of nginx deployment
kubectl describe deployment nginx-deployment

#Scale deployment to 3 replicas

joshy91

#!/bin/bash
#Manually scaling an application (can also be done through yaml changes)

#Nginx deployment yaml created in previous script
kubectl create -f nginx-deployment.yaml

#Detailed status of nginx deployment
kubectl describe deployment nginx-deployment

#Scale deployment to 3 replicas

joshy91

#!/bin/bash
#Create configmap yaml to create env variables for pod

echo “apiVersion: v1
kind: ConfigMap
metadata: 
  name: school-config
  namespace: default
data:
  STUDENT_NAME: “Joshua Davidson”

joshy91

#!/bin/bash
#How k8 configures application

#Create config map
kubectl create configmap my-map –from-literal=school=LinuxAcademy

#Check status of config map
kubectl get configmaps

#Detailed description of config map

joshy91

#!/bin/bash
#Deployments, Rolling Update, Rollback

#Nginx deployment yaml
echo “apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: default
spec:

joshy91

#!/bin/bash
#Basic status checks in kubernetes
#Check status of cluster
kubectl get nodes

#Determine if memory is low on specified node
kubectl describe node joshy914.mylabserver.com | grep MemoryPressure

#Determine if disk space is low on specified node
kubectl describe node joshy914.mylabserver.com | grep DiskPressure