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FAQ

This topic lists the frequently asked questions for using Nebula Dashboard. You can use the search box in the help center or the search function of the browser to match the questions you are looking for.

"What are Cluster, Node, and Service?"

  • Cluster: refers to a group of systems composed of nodes where multiple Nebula Graph services are located.
  • Node: refers to the physical or virtual machine hosting Nebula Graph services.
  • Service: refers to Nebula services, including Metad, Storaged, and Graphd services.

"What is the cluster status?"

The status of a cluster is as follows:

  • installing: The cluster is being created. The process will take about 3 to 10 minutes.
  • healthy: All services in the cluster are healthy.
  • unhealthy: There is an unhealthy service in the cluster service.

"Why authorizing nodes?"

Managing clusters requires the SSH information of the corresponding node. Therefore, you need to have at least an SSH account and the corresponding password with executable permissions before performing operations on Dashboard.

"Why cannot operate on the Metad service?"

The Metad service stores the metadata of the Nebula Graph database. Once the Metad service fails to function, the entire cluster may break down. Besides, the amount of data processed by the Metad service is not much, so it is not recommended to scale the Metad service. And we directly disabled operating on the Metad service in Dashboard to prevent the cluster from being unavailable due to the misoperation of users.

"Why Dashboard Enterprise Edition cannot be started?"

  • Make sure that the license file is copied to the Dashboard directory and sudo ./dashboard.service start all is executed.
  • Make sure that the license is not expired.

You can also execute cat logs/webserver.log in the Dashboard directory to view the startup information of each module. If the above conditions are met but Dashboard still cannot be started, go to Nebula Graph Official Forum for consultation.

"Can I add the Nebula Graph installation package manually?"

You can add the installation package manually in Dashboard. To download the system and RPM/DEB package you need, see How to download Nebula Graph and add the package to dashboard/download/nebula-graph. And you can select the added package for deployment when creating and scaling out a cluster.

Why do I get "Permission Denied" when importing a cluster?

When importing a cluster, you need to access the path where the Nebula Graph services are installed. If the service account does not have access privileges, the cluster cannot be imported successfully. You can grant access to the service to the account (e.g. sudo chown -R tom:tom nebula) and restart the service with the account.

Why does it prompt “SSH connection error” when importing a cluster?

If Service Host shows 127.0.0.1, and your Dashboard and Nebula Graph are deployed on the same machine when authorizing service hosts, the system will prompt "SSH connection error”. You need to change the Host IP of each service to the real machine IP in the configuration files of all Nebula Graph services. For more information, see Configuration management.

If you import a cluster deployed with Docker, it also prompts "SSH connection error". Dashboard does not support importing a cluster deployed with Docker.


Last update: March 8, 2022
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