This topic describes how to configure a Network Time Protocol (NTP) service for pods that run on a virtual-kubelet node. The NTP service synchronizes time between containers and the NTP server.
Virtual Kubelet is upgraded to the latest version.
The engineer who is responsible for upgrading Virtual Kubelet varies based on the Kubernetes cluster type:
Serverless Kubernetes (ASK) cluster: the administrator.
Managed Kubernetes cluster: you.
Dedicated Kubernetes cluster: you.
Self-managed Kubernetes cluster: you.
In the configuration file of the pod, add the following annotation to specify the IP address of the NTP server that you want to use:
Create a YAML file that is used to configure the NTP service.
The content of the YAML file is:
apiVersion: v1 kind: Pod metadata: annotations: k8s.aliyun.com/eci-ntp-server: 10.10.5.1 # The IP address of the NTP server. name: set-custom-ntp spec: nodeName: virtual-kubelet containers: - image: centos:latest command: - sleep - "3600" imagePullPolicy: IfNotPresent name: centos
Apply the configuration in the YAML file to the pod.
kubectl apply -f set-ntp-pod.yaml
Check the result
Log on the elastic container instance to check whether the NTP service works as expected.
Query the information about the pod.
kubectl get pod/set-custom-ntp
NAME READY STATUS RESTARTS AGE set-custom-ntp 1/1 Running 0 7m20s
Log on to a container.
kubectl exec set-custom-ntp -it -- bash
Query the source of the time of the container.
If the IP address of the NTP server is returned, it indicates that the NTP service works as expected. Sample output:
210 Number of sources = 1 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^* 10.10.5.1 2 6 377 35 +40us[ +135us] +/- 14ms