venkatzgithub

---
- name: Install package
  hosts: all
  become: true
  tasks:
    
    - name: update packages
      yum:
        name: '*'
        state: latest

venkatzgithub

##################### Master Node ##################################################
# Set the hostname
$ hostnamectl set-hostname <enter-hostname>

# To get effect in the system without reboot, run the following command:
$ exec bash

# Do entry in the /etc/hosts for master and worker nodes to identify by it's hostname.
e.g. echo "172.16.238.10     master"  >> /etc/hosts
     echo "172.16.238.11     worker01"  >> /etc/hosts

venkatzgithub

alias k=kubectl
k version --short


export do="--dry-run=client -o yaml"
# then we can run
Create Pod YAML
k run redis --image=redis:alpine -l tier=db
k run pod1 --image=nginx $do
k run pod1 \

venkatzgithub

Practise json path 3-4 question will be on that.
https://medium.com/faun/be-fast-with-kubectl-1-18-ckad-cka-31be00acc443
https://www.youtube.com/watch?v=wgfjXHw7uPs&feature=youtu.be
https://docs.linuxfoundation.org/tc-docs/certification/lf-candidate-handbook/exam-user-interface
https://training.linuxfoundation.org/cka-program-changes-2020/
https://medium.com/@shekharsarker/changes-with-certified-kubernetes-administrator-cka-certification-2020-9d17a0e15d59

IMP:
Deployment - create, verify, scale, expose, rollout, undorollout, history
Pod - create, modify, expose, staticPod, Multicontainer pod, troubleshooting

venkatzgithub

* install container runtime

* Installing kubeadm, kubelet and kubectl
sudo apt-get update && sudo apt-get install -y apt-transport-https curl
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF
sudo apt-get update

venkatzgithub

/*------------------------------------------
  Responsive Grid Media Queries - 1280, 1024, 768, 480
   1280-1024   - desktop (default grid)
   1024-768    - tablet landscape
   768-480     - tablet 
   480-less    - phone landscape & smaller
--------------------------------------------*/
@media all and (min-width: 1024px) and (max-width: 1280px) { }
 
@media all and (min-width: 768px) and (max-width: 1024px) { }

venkatzgithub

CKAD
Core Concepts (13%)
kubectl create namespace mynamespace
kubectl run nginx --image=nginx --restart=Never -n mynamespace
kubectl run nginx --image=nginx --restart=Never --dry-run -o yaml > myfile.yaml
kubectl run busybox --image=busybox --command --restart=Never -it -- env   #withoutput
kubectl run busybox --image=busybox --command --restart=Never -- env #with
kubectl logs busybox
kubectl run busybox --image=busybox --restart=Never -o yaml --dry-run --command env > myfile.yaml
kubectl apply -f myfile.yaml

venkatzgithub

YAML - key value pair