Unable to Log in to Dashboard During Single-Node Deployment of TiDB Cluster

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

Original topic: tidb集群单机部署出现无法登录dashboard的情况

| username: TiDBer_vJpITQ5J

How should I handle the situation where I cannot log in to the dashboard after deploying a TiDB cluster on a single machine? The 4000 port is actually in a running state, but the cluster status shows down. When trying to log in to the dashboard through the browser, it shows login failed: no running TiDB instance.

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| username: xfworld | Original post link

Check the logs in the TiDB directory to see what caused this abnormal state.

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| username: TiDBer_vJpITQ5J | Original post link

Is it the logs under this path? Which one should I specifically look at?

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| username: gary | Original post link

Check the tidb.log for any error logs, TiDB is not starting up.

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| username: Kongdom | Original post link

It is obvious that the TiDB node did not start successfully.

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| username: TiDBer_vJpITQ5J | Original post link

The way this cluster is started causes some services to fail to bring up the ports.

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| username: TiDBer_vJpITQ5J | Original post link

It is displayed like this.

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| username: Kongdom | Original post link

Please upload the corresponding tidb.log file.

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| username: Kongdom | Original post link

It looks like an SSH permission issue. Have you set up mutual trust?

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| username: TiDBer_vJpITQ5J | Original post link

Is it a cluster deployed on different ports of a single machine?

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| username: Kongdom | Original post link

Turn off the firewall and try setting up mutual trust.

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| username: xfworld | Original post link

Is the number of connections provided by SSH sufficient? If not, it will be rejected. This issue only occurs on a single machine.

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| username: TiDBer_vJpITQ5J | Original post link

I just tested increasing the maximum number of SSH terminal connections to 1000, and the same error occurred.

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| username: xfworld | Original post link

All I can say is to try more, it’s an SSH issue.

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| username: TiDBer_vJpITQ5J | Original post link

Thank you, boss. I’ll try again.

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| username: TiDBer_vJpITQ5J | Original post link

Do I still need to set up mutual trust for a single machine?

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| username: xiaohetao | Original post link

Check the status of the cluster components with tiup cluster display cluster_name to see if they are all up.

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| username: TiDBer_vJpITQ5J | Original post link

Just 4000 down

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| username: gary | Original post link

Is it deploying all nodes on a single machine?

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| username: xiaohetao | Original post link

Looking at this picture, it involves using bash and systemctl commands. The main focus here is passwordless sudo and ssh. Can your control machine connect to TiDB via ssh without a password? What is the user specified in your configuration file for starting the cluster? Both sudo and ssh are related to the user in the configuration file.