1.探针的种类
livenessProbe: 健康状态检查，周期性检查服务是否存活，检查结果失败，将重启容器。
readinessProbe: 可用性检查，周期性检查服务是否可以，不可用将从service的endpoints中移除。
2.探针的检测方法：
- exec : 执行一段命令，返回值为0 或非 0
- httpGet： 检测某个http请求返回的状态码2xx 3xx正常，4xx,5xx错误
- tcpSocket: 测试某个端口是否能够连接
3.1 liveness探针的exec使用
vi nginx_pod_exec.yaml
apiVersion: v1
kind: Pod
metadata:
name: exec
spec:
containers:
- name: nginx
image: 10.0.0.11:5000/nginx:1.13
ports:
- containerPort: 80
args:
- /bin/sh
- -c
- touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
livenessProbe:
exec:
command:
- cat
- /tmp/healthy
initialDelaySeconds: 5 #初始化检查，第一次检查在容器起来之后的第几秒
periodSeconds: 5 #多长时间检查一次
timeoutSeconds: 5 #超时时间
successThreshold: 1 #成功几次代表是健康的
failureThreshold: 1 #失败几次3.2 liveness探针的httpGet使用
```vi nginx_pod_httpGet.yaml
apiVersion: v1
kind: Pod
metadata:
name: httpget
spec:
containers:
- name: nginx
image: 10.0.0.11:5000/nginx:1.13
ports:
- containerPort: 80
livenessProbe:
httpGet:
path: /index.html
port: 80
initialDelaySeconds: 3
periodSeconds: 3
### 3.3 liceness探针的tcpSocket使用vi nginx_pod_tcpSocket.yaml
apiVersion: v1
kind: Pod
metadata:
name: tcpSocket
spec:
containers:
- name: nginx
image: 10.0.0.11:5000/nginx:1.13
ports:
- containerPort: 80
args:
- /bin/sh
- -c
- tail -f /etc/hosts
livenessProbe:
tcpSocket:
port: 80
initialDelaySeconds: 10
periodSeconds: 3
### 4.1readiness 探针的httpGet使用vi nginx-rc-httpGet.yaml
iapiVersion: v1
kind: ReplicationController
metadata:
name: readiness
spec:
replicas: 2
selector:
app: readiness
template:
metadata:
labels:
app: readiness
spec:
containers:
- name: readiness
image: 10.0.0.11:5000/nginx:1.13
ports:
- containerPort: 80
readinessProbe:
httpGet:
path: /qiangge.html
port: 80
initialDelaySeconds: 3
periodSeconds: 3
```