Preparing for CKA and CKAD

1.1 what's easier about CKAD

1.2 what's harder about CKAD

1.3 what's easier about CKA

1.4 what's harder about CKA

2.0.1 CKA

2.0.2 CKAD

2.0.3 Kubernetes the Hard Way

1. What it will teach you for CKA
   
   • etcd
   • certificate generation
   • order of bootstrapping nodes
2. What it will not teach you
   
   • Using kubeadm (used in the exams and in Konvoy)
   • examining and fixing certificates
   • lots of other stuff
     • The certificate generation was not useful in the exams - instead, you will need openssl to examine certificates and either openssl or kubeadm to refresh

2.0.4 Killer.sh - CKA and CKAD test simulators! (pay)   paid

4.0.1 Practice a lot with Gate One

docker run  --name=gateone -p 443:8000 -d yovio/gateone 

kubectl run gateone --image=yovio/gateone --restart=Never --port=443
kubectl expose pod gateone --port=8000 --target-port=443

4.0.2 Be fast with vim

4.0.3 Practice setup of alias and vim settings

1. vim settings in ~/.vimrc
   

   set expandtab
   set tabstop=2
   set shiftwidth=2
   

2. Alias and auto-completion
   

   • Test that Bash completion is working with kubectl:

     kubectl conf<TAB>
     # should expand to kubectl config
     

   • Set your aliases in ~/.bashrc

     alias k='kubectl'
     alias k='kubectl config set-context --current --namespace '
     alias kx='kubectl config get-contexts'
     

4.0.4 Get awesome with imperative kubectl

# Create a pod
k run mypod --image=nginx --restart=Never --labels=app=mypod
# Create a Deployment - this is the default, so --restart may be omitted
k run mydeployment --image=nginx --restart=Always --replicas=3
# Create a Job
k run myjob --image=nginx --restart=OnFailure
# Create a Service
k expose deploy mydeployment --port=8080 --target-port=80 --type=NodePort --name myservice
# Create a DaemonSet by creating manifest for Deployment, then editing

4.0.5 Learn some little about JSONPATH and –sort-by

4.0.6 Just prior to the exam

1. Assign C-w to an extension
   

   This is to prevent accidentally closing the exam window! chrome://extensions -> Keyboard shortcuts

   I use the Quick Tabs extension

2. Install/Enable the exam extension
   

   Innovative Exams Screensharing

3. Disable all extensions other than the exam and the extension you assigned to C-w
   

4.0.7 Approach when first logged in

1. Step 1: Assure vim settings are correct in ~/.vimrc
   

   set tabstop=2
   set expandtab
   set shiftwidth=2
   

2. Step 2: suss environment
   

   w
   cat /etc/os-release
   

3. Step 3: install bash-completion and tmux
   

   On CentOS/Red Hat

   sudo yum install bash-completion tmux
   source ~/.bashrc
   

   On Debian/Ubuntu

   sudo apt install bash-completion
   source /etc/bash_completion
   

4. Step 4: aliases and completion
   

   alias k='kubectl'
   alias kn='kubectl config set-context --current --namespace '
   alias kx='kubectl config get-contexts'
   ## notes file: add, edit, notes (view)
   alias a='echo >> ~/.notes.txt '
   ## save my kubectl explain thangs in fast text files
   source <(kubectl completion bash)
   complete -F __start_kubectl k