下載測試鏡像

docker pull yakexi007/myapp:v1
docker pull yakexi007/myapp:v2
docker tag yakexi007/myapp:v1  reg.westos.org/library/myapp:v1
docker tag yakexi007/myapp:v2 reg.westos.org/library/myapp:v2
docker push reg.westos.org/library/myapp:v1
docker push reg.westos.org/library/myapp:v2

更新應(yīng)用版本

kubectl set image deployment/myapp myapp=myapp:v2
curl 192.168.67.13:32209

kubectl rollout history deployment myapp

kubectl rollout undo deployment myapp --to-revision=1
curl 192.168.67.11:32209

kubectl delete  deployments.apps myapp
kubectl delete svc myapp
kubectl get pod

kubectl get ns

mkdir pod
cd pod/

kubectl explain pod.spec.containers

vim pod.yml
cat pod.yml

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: demo
  name: demo
spec:
  containers:
  - image: nginx
    name: demo
  - image: redis:6.2.4
    name: redis

kubectl apply -f pod.yml
kubectl describe pod

kubectl delete  -f pod.yml

vim pod.yml
cat pod.yml

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: demo
  name: demo
spec:
  containers:
  - image: nginx
    name: demo
    imagePullPolicy: IfNotPresent

kubectl apply -f pod.yml
kubectl get pod demo -o yaml
kubectl delete -f pod.yml

3?資源限制

vim pod.yml
cat pod.yml

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: demo
  name: demo
spec:
  containers:
  - image: nginx
    name: demo
    imagePullPolicy: IfNotPresent
    resources:
      limits:
        cpu: 1
        memory: 200M
      requests:
        cpu: 0.5
        memory: 100M

kubectl apply -f pod.yml
kubectl get pod demo -o yaml

Guaranteed，保證級別：Pod 中的容器都設(shè)置了 CPU 和 Memory 的 requests 和 limits，并且這些值相等。此時(shí)，如果資源滿足所有 Guaranteed 類別的 Pod 的需求，則這些 Pod 會被同時(shí)調(diào)度在集群中，保證它們的運(yùn)行。

Burstable，突發(fā)級別：Pod 中至少有一個(gè)容器設(shè)置了 CPU 和 Memory 的 requests 和 limits，但是這些值不相等。此時(shí)，如果資源足夠，那么這些 Pod 會被相應(yīng)地調(diào)度，但是它們的性能可能會受到限制，因?yàn)樗鼈兡軌蚴褂玫馁Y源是有上限的。

BestEffort，盡力級別：Pod 中的容器沒有設(shè)置 CPU 和 Memory 的 requests 和 limits。此時(shí)，這些容器會盡力地獲取集群中未被占用的資源，但是它們的資源使用是無法保證的，因?yàn)樗鼈冃枰却褐幸逊峙涞乃匈Y源使用完畢才能夠獲得更多的資源。

4.端口映射

##有配置NodePort，外部流量可訪問k8s中的服務(wù)

vim pod.yml
cat pod.yml

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: demo
  name: demo
spec:
  containers:
  - image: nginx
    name: demo
    imagePullPolicy: IfNotPresent
    ports:
    - containerPort: 80
      hostPort: 80

kubectl apply -f pod.yml
kubectl get pod -o wide
kubectl describe  pod demo

vim pod.yml
cat pod.yml

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: demo
  name: demo
spec:
  hostNetwork: true
  nodeSelector:
    kubernetes.io/hostname: k8s2
  containers:
  - image: nginx
    name: demo
    imagePullPolicy: IfNotPresent

kubectl apply -f pod.yml
kubectl describe  pod demo
kubectl delete -f pod.yml

kubectl expose pod liveness-http --port 80 --target-port 80