Quick introduction the kubernetes from basic and some experience about some skill to use kubernetes.

1. Kubernetes Basics
Simon Su @ 201907
https://shorturl.at/krCDF

2. Objective
● Learning Kubernetes concept
● Kubernetes components overview
● Command line hands on
● Experience share

3. Kubernetes Orchestration

4. Pod vs.
Deployment
- Pod - the smallest unit and cannot
split for runtime
- Replica Set - definition of replicas of
pod
- Deployment - the summary of
pod/replica set

5. Scaling of
Deployment
- Manual scale
- Pod auto scale
- Cluster autoscale

6. Rolling update

7. State of Pod
- Stateful Set - long time running, data
need persistent as possible
- Deployment - short time live,
sessionless and quick startup
From: https://blog.openshift.com/kubernetes-state-storage/

8. Daemon Set
- DaemonSet - live in every node and
only single instance in each node

9. Secret
- Secret - secure info, username,
password… that want to hind at the
first look

10. ConfigMap
- Configuration, documents, startup
script, environment variable…
parameters that change frequently
and extract from container

11. Service expose
- Service - the network entrypoint of
running pods, with service ip address
and can define some network
parameters

12. Ingress
- Layer 7 load balancer and provide
configurable rules for dispatch
traffics to backend deployments

13. Storage Class
- Storage as a service, let user can
define the storage and provide to
pod for use
From: https://cloud.ibm.com/docs/containers?topic=containers-kube_concepts&locale=en-us

14. Network Policy
- Network policy - Between pods
traffic management
- Firewall rule management
From: https://cilium.io/blog/2018/09/19/kubernetes-network-policies/

15. Kubernetes CLI

16. kubectl commands
● run
● expose
● create
● apply
● delete
● get
● describe
● exec
● logs

17. Kubectl - run commands
$ kubectl run nginx --image=image --port=80
$ kubectl get pods,deploy
NAME READY STATUS RESTARTS AGE
po/nginx-1423793266-svb16 1/1 Running 1 5h
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
deploy/nginx 1 1 1 1 5h

18. $ kubectl expose deploy/nginx --type=NodePort
$ kubectl get svc
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.0.0.1 <none> 443/TCP 2d
nginx 10.0.0.227 <nodes> 80:31659/TCP 5h
kubectl - expose

19. kubectl - delete
$ kubectl delete svc/nginx
$ kubectl delete deploy --all

20. kubectl - exec
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-1423793266-svb16 1/1 Running 1 5h
$ kubectl exec -it nginx-1423793266-svb16 bash
root@nginx-1423793266-svb16:/#

21. $ kubectl logs -f nginx-1423793266-svb16
172.17.0.1 - - [24/Oct/2017:17:24:15 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.54.0" "-"
172.17.0.1 - - [24/Oct/2017:17:24:25 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.54.0" "-"
$ kubectl logs -f nginx-1423793266-svb16 --tail 30
kubectl - logs

22. $ kubectl get pod,svc,deploy
$ kubectl get all -o wide
NAME READY STATUS RESTARTS AGE IP NODE
po/nginx-1423793266-svb16 1/1 Running 1 5h 172.17.0.3 minikube
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
svc/kubernetes 10.0.0.1 <none> 443/TCP 2d <none>
svc/nginx 10.0.0.37 <nodes> 80:32739/TCP 1m run=nginx
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE CONTAINER(S) IMAGE(S) SELECTOR
deploy/nginx 1 1 1 1 5h nginx nginx run=nginx
NAME DESIRED CURRENT READY AGE CONTAINER(S) IMAGE(S) SELECTOR
rs/nginx-1423793266 1 1 1 5h nginx nginx
pod-template-hash=1423793266,run=nginx
kubectl - get

23. $ kubectl get node
$ kubectl get event
$ kubectl get all --all-namespaces
$ kubectl get pod -l component=web
kubectl - get

24. kubernetes yaml file
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
labels:
run: nginx
name: nginx
spec:
template:
metadata:
labels:
run: nginx
spec:
containers:
- image: nginx
name: nginx
ports:
- containerPort: 80
protocol: TCP
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apiVersion: v1
kind: Service
metadata:
labels:
name: nginx
name: nginx
spec:
type: NodePort
ports:
- port: 80
selector:
name: nginx
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: nginx
spec:
backend:
serviceName: nginx
servicePort: 80
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deployment.yaml service.yaml ingress.yaml

25. kubectl create
$ kubectl create -f deployment.yaml
$ kubectl create -f http://your-service-address/path/deployment.yaml

26. kubectl apply
$ kubectl apply -f deployment.yaml
$ kubectl apply -f http://your-service-address/path/deployment.yaml

27. Skills of Kubernetes Deployment

28. Configmap as
Environment
- Config use for single or multi
deployments
- Using environment parameter to
control

29. Sidecar
deployment
- share the same filesystem
namespace
- share the same network namespace

30. Init container
- Pre-setup environment
- Initialize environment

31. Labels and
Node Selector
- HW select
- Resource allocate
- Network layer distribute

32. Private Registry
- Privacy and secure
- Performance and stable

33. Taint and
Tolerations
- Resource allocation
- Node resource management

34. Resource
management
- cpu, memory limit and request
- custom metrics

35. Readiness
and Liveness
- Prevent 5xx error
- Auto kill unhealthy pod

36. Q&A