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This topic has been translated from a Chinese forum by GPT and might contain errors.Original topic: 版本升级
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username: 胡杨树旁
Upgrading from the original v5.0.0 version to v6.1.1 version
Steps:
tiup update --self
tiup update cluster
tiup cluster upgrade mnn-cluster v6.1.1
Error message:
Failed to download files from the mirror source, possible reasons:
According to the guidance, the network is normal after pinging. I re-downloaded the image, but the drainer failed to start after the upgrade. The error message is as follows:
Teacher, I restarted the problematic TiDB and printed the logs.
TiDB logs:
Moreover, only by shutting down the tidb-server at 10.0.0.52:4002 can the other components start normally.
This URL is sometimes usable and sometimes not, it’s unstable.
It’s the address for downloading the image, right? The upgrade failed when the network was unstable. 
Is there a time difference between your nodes? Have you synchronized them with NTP?
Teacher, I haven’t done NTP synchronization. How do I perform NTP synchronization?
The images you provided are not accessible. Please provide the text content you need translated.
There is a 3-minute time difference between your two nodes, which is a big problem. 
The fundamental requirement of a distributed system is that the time across all nodes must be consistent, and PD election heavily relies on time.
The official documentation explains how to configure NTP synchronization:
You can use offline upgrade. Download the 1GB file from the official website and extract it locally.
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