正文

k8s 存活探针（健康检查）

IP云
IP云V管理员/2 阅读
08/17
小程序：扫一扫查出行
【扫一扫了解最新限行尾号】
复制小程序

重启策略 （RestartPolicy ）

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。
 
probe有以下两种类型：
livenessProbe：如果检查失败，将杀死容器，根据Pod的restartPolicy来操作。
readinessProbe： 如果检查失败，Kubernetes会把Pod从service endpoints中剔除
 
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。
tcpSocket：发起TCP Socket建立成功。
 
 

方法一 httpGet

nginx使用httpGet健康检查的方法

apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
spec:
replicas: 1
selector:
matchLabels:
app: nginx
minReadySeconds: 1
progressDeadlineSeconds: 60
revisionHistoryLimit: 2
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 1
maxUnavailable: 1
template:
metadata:
name: nginx
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.19
ports:
- containerPort: 80
resources:
requests:
memory: "500Mi"
cpu: "250m"
limits:
memory: "500Mi"
cpu: "500m"
livenessProbe:
httpGet:
path: /
port: 80
initialDelaySeconds: 10 #pod启动10秒执行第一次检查
periodSeconds: 5 #第一次检查后每隔5秒检查一次
volumeMounts:
- name: html
mountPath: /usr/share/nginx/html
volumes:
- name: html
hostPath:
path: /home/k8s/data/nginx
---
apiVersion: v1
kind: Service
metadata:
name: nginx
spec:
type: NodePort
ports:
- port: 8080
nodePort: 30080
selector:
app: nginx

 

方法二：tcpSocket

nginx使用tcpSocket健康检查的方法

apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
spec:
replicas: 1
selector:
matchLabels:
app: nginx
minReadySeconds: 1
progressDeadlineSeconds: 60
revisionHistoryLimit: 2
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 1
maxUnavailable: 1
template:
metadata:
name: nginx
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.19
ports:
- containerPort: 80
resources:
requests:
memory: "500Mi"
cpu: "250m"
limits:
memory: "500Mi"
cpu: "500m"
livenessProbe:
tcpSocket:
port: 80
initialDelaySeconds: 10
periodSeconds: 5
volumeMounts:
- name: html
mountPath: /usr/share/nginx/html
volumes:
- name: html
hostPath:
path: /home/k8s/data/nginx
---
apiVersion: v1
kind: Service
metadata:
name: nginx
spec:
type: NodePort
ports:
- port: 8080
nodePort: 30080
selector:
app: nginx