What Should I Do If a Node Does Not Synchronize with the NTP Clock Source?
Symptom
In special scenarios, if the ntpd on a node cannot access the NTP server for a long time, the time offset may be too large and cannot be automatically restored.
Problem Detection
You can detect the problem by installing the CCE Node Problem Detector (npd) add-on that has the node time synchronization check item. For details, see CCE Node Problem Detector.
Possible Causes
This is a known issue on nodes running EulerOS or CentOS. Nodes running other types of OSs are not affected by this issue.
This issue has been resolved in clusters of v1.19.16-r7, v1.21.9-r10, and v1.23.7-r10.
Solution
- If your cluster version is v1.19.16-r7, v1.21.9-r10, v1.23.7-r10, or later, the node of this version has been switched to chronyd for time synchronization. Reset the node OS to the latest version to rectify the fault.
- If your cluster version does not meet the requirements, you are advised to upgrade the cluster to v1.19.16-r7, v1.21.9-r10, v1.23.7-r10, or later, and then reset the node OS to the latest version.
Node Running FAQs
- What Should I Do If a Cluster Is Available But Some Nodes Are Unavailable?
- How Do I Troubleshoot the Failure to Remotely Log In to a Node in a CCE Cluster?
- How Do I Log In to a Node Using a Password and Reset the Password?
- How Do I Collect Logs of Nodes in a CCE Cluster?
- What Can I Do If the Container Network Becomes Unavailable After yum update Is Used to Upgrade the OS?
- What Should I Do If the vdb Disk of a Node Is Damaged and the Node Cannot Be Recovered After Reset?
- Which Ports Are Used to Install kubelet on CCE Cluster Nodes?
- How Do I Configure a Pod to Use the Acceleration Capability of a GPU Node?
- What Should I Do If I/O Suspension Occasionally Occurs When SCSI EVS Disks Are Used?
- What Should I Do If Excessive Docker Audit Logs Affect the Disk I/O?
- How Do I Fix an Abnormal Container or Node Due to No Thin Pool Disk Space?
- Which Ports Does a Node Listen On?
- How Do I Rectify Failures When the NVIDIA Driver Is Used to Start Containers on GPU Nodes?
- What Should I Do If a Node Does Not Synchronize with the NTP Clock Source?
- What Should I Do If the Data Disk Usage Is High Because a Large Volume of Data Is Written Into the Log File?
- Why Does My Node Memory Usage Obtained by Running the kubelet top node Command Exceeds 100%?
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