K8s-yaml的使⽤及命令YAML配置⽂件管理对象
对象管理：
# 创建deployment资源
kubectl create -f nginx-deployment.yaml
# 查看deployment
kubectl get deploy
# 查看ReplicaSet
kubectl get rs
# 查看pods所有标签
kubectl get pods --show-labels
# 根据标签查看pods
kubectl get pods -l app=nginx
# 滚动更新镜像
kubectl set image deployment/nginx-deployment nginx=nginx:1.11
或者
kubectl edit deployment/nginx-deployment
或者
kubectl apply -f nginx-deployment.yaml
# 实时观察发布状态：
kubectl rollout status deployment/nginx-deployment
# 查看deployment历史修订版本
kubectl rollout history deployment/nginx-deployment
kubectl rollout history deployment/nginx-deployment --revision=3
# 回滚到以前版本
kubectl rollout undo deployment/nginx-deployment
kubectl rollout undo deployment/nginx-deployment --to-revision=3
# 扩容deployment的Pod副本数量
kubectl scale deployment nginx-deployment --replicas=10
# 设置启动扩容/缩容
kubectl autoscale deployment nginx-deployment --min=10 --max=15 --cpu-percent=80
对象管理实例：vim nginx.deployment.yaml
apiVersion: apps/v1beta2
kind: Deployment
metadata:
name: nginx-deployment
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.10
ports:
- containerPort: 80
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centos vim命令
服务发现实例：vim nging.service.yaml
apiVersion: v1
kind: Service
metadata:
labels:
run: nginx
name: nginx
namespace: default
spec:
- port: 88
targetPort: 80
selector:
app: nginx
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清理：
# kubectl delete -f nginx-deployment.yaml
# kubectl delete -f nginx-service.yaml
POD作⽤：
      Pod状态  创建/查询/更新/删除  重启策略  健康检查  数据持久化和共享  hostPort  问题定位Pod管理-创建/查询/更新/删除
基本管理：
# 创建pod资源
kubectl create -f pod.yaml
# 查看pods
kubectl get pods pod-test
# 查看pod描述
kubectl describe pod pod-test
# 替换资源
kubectl replace -f pod.yaml -force
# 删除资源
kubectl delete pod pod-test
⽀持三种策略：
Always：当容器终⽌退出后，总是重启容器，默认策略。
OnFailure：当容器异常退出（退出状态码⾮0）时，才重启容器。
Never：当容器终⽌退出，从不重启容器。
Pod实例：vim pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: pod-test
labels:
os: centos
spec:
containers:
- name: hello
image: centos:7
env:
- name: Test
value: "123456"
command: ["bash","-c","while true;do date;sleep 1;done"]
restartPolicy: OnFailure
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Pod管理-健康检查：
提供Probe机制，有以下两种类型：
livenessProbe
如果检查失败，将杀死容器，然后根据Pod的重启策略来决定是否
重启。
readinessProbe
如果检查失败，Kubernetes会把Pod从服务代理的分发后端剔除。
Probe⽀持以下三种检查⽅法：
httpGet
发送HTTP请求，返回200-400范围状态码为成功。
exec
执⾏Shell命令返回状态码是0为成功。
发起TCP Socket建⽴成功。
实例：vim pod2.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx-pod
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.10
ports:
- containerPort: 80
livenessProbe:
httpGet:
path: /index.html
port: 80
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Pod管理-数据持久化和共享：
vim pod3.yaml
apiVersion: v1
kind: Pod
metadata:
name: pod-test1
labels:
test: centos
spec:
containers:
# 第⼀个容器
- name: hello-write
image: centos:7
command: ["bash","-c","for i in {1..1000};do echo $i >> /data/hello;sleep 1;done"]  # 第⼆个容器
- name: hello-read
image: centos:7
command: ["bash","-c","for i in {1..1000};do cat $i >> /data/hello;sleep 1;done"]    volumeMounts:
- name: data
mountPath: /data
# 数据卷
volumes:
-
name: data
hostPath:
path: /data
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Pod端⼝映射：
vim pod4.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx-pod
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.10
ports:
- name: http
containerPort: 80
hostIP: 0.0.0.0
hostPort: 80
protocol: TCP
-
name: https
containerPort: 443
hostIP: 0.0.0.0    hostPort: 443    protocol: TCP

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