CKA-fluffy-octo-sniffle-guide

A CKA exam questions bank / tips and tricks for the fluffy octo sniffle engineers to ace CKA and actually goes beyond the exam and leak to your actual work.

🛠 Pre-requisites

Useful terminal Shortcuts

Be a Bash Wiz (not really T_T).

Ctrl+A beginning of a terminal line.

Ctrl+E end of a terminal line.

Alt+f

Alt+b

Ctrl+A then # hash the command so you can adjust it without running it accidentally.

cat /etc/*-release or cat /etc/os-release tells you info about the OS.

Useful VIM Shortcuts

No you wont use vim for writing production level code.

However, you need to know some shortcuts as a yaml warrior.

command mode

:q!

:wq!

:%d

normal mode

dd

/

n-N

w-b

Ctrl+d

Ctrl+u

visual mode

this mode is similar to dragging your cursor to highlight, and you can delete, copy, paste with it.

📚 Courses & Books a starting point.

Cluster Install

Initialize the Cluster

CNI

kubectl apply -f CNI

DNS

to check the svc we can use curl kubectl exec web -n payroll -- curl web-service.default

nslookup for a service kubectl exec -it hr -- nslookup mysql.payroll > /root/CKA/nslookup.out

Node Upgrade

etcd backup

Storage

Volume types

hostPath

  volumeMounts:
    - mountPath: /var/local/aaa
      name: mydir
    - mountPath: /var/local/aaa/1.txt
      name: myfile
  volumes:
    - name: mydir
      hostPath:
        # Ensure the file directory is created.
        path: /var/local/aaa
        type: DirectoryOrCreate
    - name: myfile
      hostPath:
        path: /var/local/aaa/1.txt
        type: FileOrCreate

configMap

  volumeMounts:
    - name: config-vol
      mountPath: /etc/config
  volumes:
    - name: config-vol
      configMap:
        name: log-config
        items:
          - key: log_level
            path: log_level

Imperative Commands

Doc Links

Exam Questions

RBAC

Create role
rolebinding
User
Can create and list deployment
clusterrole --> create deployment
role --> list deployment

AhalimZaki/CKA-fluffy-octo-sniffle-guide