使用liveness探针httpget方式检测pod健康，httpGet方式使用的最多
[root@k8s-master1 tanzhen]# cat nginx_pod_httpGet.yaml
apiVersion: v1
kind: Pod
metadata:
name: httpget
labels:
app: my-dep
spec:
containers:
- name: nginx
image: centos-nginx:1.23.0
imagePullPolicy: Never
ports:
- containerPort: 80
livenessProbe:
httpGet:
path: /index.html
port: 80
initialDelaySeconds: 5
periodSeconds: 5
timeoutSeconds: 3
successThreshold: 1
failureThreshold: 2创建pod
[root@k8s-master1 tanzhen]# kubectl create -f nginx_pod_httpGet.yaml
pod/httpget created查询pod描述
由于检测的是Nginx80端口index.html页面，这个连接正常存在，所以状态一直是Normal
[root@k8s-master1 ~]# kubectl describe pod httpget
Name: httpget
Namespace: default
Priority: 0
Node: k8s-node1/192.168.198.146
Start Time: Tue, 23 Aug 2022 10:56:44 +0800
Labels: app=my-dep
Annotations: <none>
Status: Running
IP: 10.244.1.53
IPs:
IP: 10.244.1.53
Containers:
nginx:
Container ID: docker://00e017fcb9763c113b39433f1e33516d25ed9426f85bca78e89f17c13a0c0282
Image: centos-nginx:1.23.0
Image ID: docker://sha256:704f81f69b5bf4f7b52006b1ebea4c4c25c92dd95994dacad66780ae82395607
Port: 80/TCP
Host Port: 0/TCP
State: Running
Started: Tue, 23 Aug 2022 10:56:45 +0800
Ready: True
Restart Count: 0
Liveness: http-get http://:80/index.html delay=5s timeout=3s period=5s #success=1 #failure=2
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-clqrl (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
default-token-clqrl:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-clqrl
Optional: false
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 6m34s default-scheduler Successfully assigned default/httpget to k8s-node1
Normal Pulled 6m32s kubelet Container image "centos-nginx:1.23.0" already present on machine
Normal Created 6m32s kubelet Created container nginx
Normal Started 6m32s kubelet Started container nginx重新发布一个pod：httpget2，检测端口改成8080，测试检测结果
apiVersion: v1
kind: Pod
metadata:
name: httpget2
labels:
app: my-dep
spec:
containers:
- name: nginx
image: centos-nginx:1.23.0
imagePullPolicy: Never
ports:
- containerPort: 80
livenessProbe:
httpGet:
path: /index.html
port: 8080
initialDelaySeconds: 5
periodSeconds: 5
timeoutSeconds: 3
successThreshold: 1
failureThreshold: 2[root@k8s-master1 tanzhen]# kubectl apply -f nginx_pod_httpGet.yaml
pod/httpget2 created探针检测 Get "http://10.244.1.54:8080/index.html"失败，容器kill掉重启
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 46s default-scheduler Successfully assigned default/httpget2 to k8s-node1
Normal Pulled 13s (x4 over 45s) kubelet Container image "centos-nginx:1.23.0" already present on machine
Normal Created 13s (x4 over 45s) kubelet Created container nginx
Normal Started 13s (x4 over 45s) kubelet Started container nginx
Warning Unhealthy 3s (x8 over 38s) kubelet Liveness probe failed: Get "http://10.244.1.54:8080/index.html": dial tcp 10.244.1.54:8080: connect: connection refused
Normal Killing 3s (x4 over 33s) kubelet Container nginx failed liveness probe, will be restarted
Warning BackOff 3s kubelet Back-off restarting failed containerhttpget2 可以看到已经重启了6次
[root@k8s-master1 tangzheng]# kubectl get pod
NAME READY STATUS RESTARTS AGE
httpget 1/1 Running 0 28m
httpget2 1/1 Running 6 3m8s
