k8s/StudyNotes

Links
- https://kodekloud.com/
- Certified Kubernetes Administrator: https://www.cncf.io/certification/cka/
- Exam Curriculum (Topics): https://github.com/cncf/curriculum
- Candidate Handbook: https://www.cncf.io/certification/candidate-handbook
- Exam Tips: http://training.linuxfoundation.org/go//Important-Tips-CKA-CKAD
- Use the code – DEVOPS15 – while registering for the CKA or CKAD exams at Linux Foundation to get a 15% discount.
kubeadm
- deploys all the kubernetes services downloaded from web
Kube-Scheduler
1. Filter Nodes (Pod cant fit)
2. Rank Nodes (Compare resources left, try to balance cpu/mem usage)
kubelet - captain on each Worker Node
- Registers with Master node, reports status and executes
- Always manual install wget https://storage.googleapis.com/kubernetes-release/release/v1.xx.x/bin/linux/amd64/kubelet
  - Not kubeadm managed.
  - Needs tls bootstrap
Kube-proxy - run on each node, service's virtual component
- All pods can see all other pods, through POD Network, by IP/Name. Exposed through service: eg. db(IP)
- Watches for service creation, and then configure network e.g. Iptables to forward to actual pod.
- Install: download wget to install or
  - kubeadm will deploy it as deamon set to each pod in namespace kube-system
kind: Deployments - Encapsulates ReplicaSet that Encapsulate Pods
- Can have deployment and replacement policy
kind: ResourceQuote
- spec:
  - hard:
    - cpu: