chadmcrowell

######################################
######### DISABLING SERVICES #########
######################################
# view running services
systemctl | grep running

# view state of snapd service
systemctl status snapd

# stop the snapd service

chadmcrowell

# use the following lab environment:
# https://studyk8s.club/cka-configmaps

# create the configmap 
cat << EOF > redis-configMap.yaml
apiVersion: v1
data:
  redis-config: |
    maxmemory: 2mb
    maxmemory-policy: allkeys-lru

chadmcrowell

# perform the commands from this lab environment:
# https://studyk8s.club/cka-logging

# create a pod that will output logs to stdout
cat << EOF > pod-logging.yaml
apiVersion: v1
kind: Pod
metadata:
  name: pod-logging
spec:

chadmcrowell

# perform the command from this lab environment:
# https://studyk8s.club/cka-upgrade-k8s

# plan the upgrade
kubeadm upgrade plan

# upgrade the version of kubeadm
sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl gpg
mkdir -p /etc/apt/keyrings/

chadmcrowell

# perform the commands from the following lab environment:
# https://studyk8s.club/cka-new-user

# view the config
k config-view
cat ~/.kube/config
echo $KUBECONFIG
cat /etc/kubernetes/admin.conf

# list the cluster users

chadmcrowell

# perform the commands from the following lab environment:
# https://studyk8s.club/cka-ectd-backup

# set etcdctl environment variable api to version 3
export ECTDCTL_API=3

# etcd help menu
etcdctl snapshot -h

# backup etcd

chadmcrowell

# perform the commands from the following site:
# https://studyk8s.club/cka-warmup

# list all the api resources 
k api-resources

# help menu is your friend
k -h

# help menu goes many levels deep

chadmcrowell

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: email-service
  name: email-service
spec:
  replicas: 1
  selector:
    matchLabels:

chadmcrowell

# add bitnami repo for access to prometheus helm chart
helm repo add bitnami https://charts.bitnami.com/bitnami

# install prometheus operator via helm chart
helm install prometheus bitnami/kube-prometheus

# watch as pods are created
kubectl get po -w

# customize the helm chart for grafana dashboard

chadmcrowell

#!/bin/bash

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh