layout: post title: “ ansilh’s k8s guide -1 “

categories: jekyll update

BANG!!!

查看一个YAML文件的层级结构的方法：

k run nginx --image=nginx --restart=Never 

then:

k get po nginx -o yaml --export

Requests and limits

command line

kubectl run nginx --image=nginx --restart=Never --requests='cpu=100m,memory=256Mi' --limits='cpu=200m,memory=512Mi'

yaml way

spec:
  containers:
  - image: nginx
    imagePullPolicy: Always
    name: nginx
    resources:
      limits:
        cpu: 200m
        memory: 512Mi
      requests:
        cpu: 100m
        memory: 256Mi

Q1: pod的YAML内部是如何使用label的？

元数据

metadata:
  creationTimestamp: null
  labels:
    run: nginx
  name: nginx

label selector

yaml文件内部如何表示？

YAML crash course

https://ansilh.com/05-yaml_primer/01-structure/

Ports in Service Objects

port in kubectl

 --port=80 

 --target-port=9090  

 --type=NodePort

nodePort

port

targetPort

For example:

apiVersion: v1
kind: Service
metadata:
  name: order-service
spec:
  ports:
  - port: 8080
    targetPort: 8170
    nodePort: 32222
    protocol: TCP 
  selector:
    component: order-service-app

svc-type

k  get svc nginx -o yaml --export

Flag --export has been deprecated, This flag is deprecated and will be removed in future.
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    run: nginx
  name: nginx
  selfLink: /api/v1/namespaces/default/services/nginx
spec:
  externalTrafficPolicy: Cluster
  ports:
  - port: 8964
    protocol: TCP
    targetPort: 80
  selector:
    run: nginx
  sessionAffinity: None
  type: NodePort
status:
  loadBalancer: {}

所以访问一个服务有三种办法：

access-service

* * * * service 这一部分再看一次

参考资料： https://vitalflux.com/kubernetes-port-targetport-and-nodeport/