Error Starting DM: Unable to Start

This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: dm 启动出错 无法启动

| username: 初来乍到

[TiDB Usage Environment] Production Environment
[TiDB Version]

[Reproduction Path] Use tiup to install the DM cluster. The DM cluster consists of two machines, and the two machines are interconnected within the internal network. The configuration file and installation success screenshots are as shown above.

[Encountered Issues: Problem Phenomenon and Impact]

  1. Unable to start when using tiup dm start dminfix
  2. Check the dm-master error information as follows

    dm-worker error information as follows

    Before the startup is completed, checking the processes on each server shows that they have started but eventually all went down.

[Resource Configuration] Go to TiDB Dashboard - Cluster Info - Hosts and take a screenshot of this page
DM cluster cannot start
[Attachments: Screenshots/Logs/Monitoring]

| username: rebelsre | Original post link

The two masters have split-brain, right? Try shrinking one or expanding one.

| username: 初来乍到 | Original post link

Deploying one machine is not a problem. I’ll try adding one more.

| username: 初来乍到 | Original post link

Added a node, still the same issue.

| username: 初来乍到 | Original post link

The intranet between the three machines is connected, and the machines are new without running other tasks.

| username: zhaokede | Original post link

How could there be an IO timeout?

| username: tidb菜鸟一只 | Original post link

Your MASTER hasn’t started, right? So the worker can’t start. Please provide more complete logs from the master node.

| username: 友利奈绪 | Original post link

First deploy on a single machine and then expand online?

| username: 初来乍到 | Original post link

Thank you for the response. I found the issue; the operations team didn’t open the port.

| username: system | Original post link

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