pod资源的健康检查-readiness探针的httpGet使用

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用，不可用将从service的endpoints中移除

同一个容器中，可以同时使用livenessProbe，readinessProbe。

都是使用httpGet方式，livenessProbe探针检测容器监控状态，readinessProbe探针服务可以性

[root@k8s-master1 tanzhen]# cat nginx-deploy2-httpGet.yaml

apiVersion: apps/v1

kind: Deployment

metadata:

  name: readiness

spec:

  replicas: 1

  selector:

    matchLabels:

      app: readiness

      version: v1

  template:

    metadata:

     labels:

      app: readiness

      version: v1

    spec:

       containers:

       - name: readiness

         image: centos-nginx:1.23.0

         imagePullPolicy: IfNotPresent

         livenessProbe:

           httpGet:

             path: /index.html

             port: 80

           initialDelaySeconds: 5

           periodSeconds: 10

         readinessProbe:

           httpGet:

             path: /index.html

             port: 80

           initialDelaySeconds: 5

           periodSeconds: 10

创建deployment

[root@k8s-master1 tanzhen]# kubectl apply -f nginx-deploy2-httpGet.yaml

deployment.apps/readiness created

创建svc，

[root@k8s-master1 tanzhen]# cat svc.yaml

apiVersion: v1

kind: Service

metadata:

  creationTimestamp: null

  name: readiness-svc

spec:

  ports:

  - port: 80

    protocol: TCP

    targetPort: 80

  selector:

    app: readiness

    version: v1

  type: NodePort

status:

  loadBalancer: {}

[root@k8s-master1 tanzhen]# kubectl apply -f svc.yaml

service/readiness-svc created

describe查询svc资源，可以看到Endpoints已经加入一个pod资源，如果探针检测到服务异常，就会吧对应的pod资源从Endpoints中剔除

[root@k8s-master1 tanzhen]# kubectl get svc

NAME            TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE

kubernetes      ClusterIP   10.96.0.1        <none>        443/TCP        10d

my-dep          NodePort    10.103.136.43    <none>        80:31644/TCP   8d

readiness-svc   NodePort    10.108.113.163   <none>        80:30663/TCP   10m

[root@k8s-master1 tanzhen]#

[root@k8s-master1 tanzhen]#

[root@k8s-master1 tanzhen]# kubectl describe svc readiness-svc

Name:                     readiness-svc

Namespace:                default

Labels:                   <none>

Annotations:              <none>

Selector:                 app=readiness,version=v1

Type:                     NodePort

IP:                       10.108.113.163

Port:                     <unset>  80/TCP

TargetPort:               80/TCP

NodePort:                 <unset>  30663/TCP

Endpoints:                10.244.2.20:80

Session Affinity:         None

External Traffic Policy:  Cluster

Events:                   <none>

pod资源的健康检查-readiness探针的httpGet使用的相关教程结束。