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Manage Nebula Graph Service

Nebula Graph supports managing services with scripts or systemd. This topic will describe the two methods in detail.

Enterpriseonly

Managing Nebula Graph with systemd is only available in the Nebula Graph Enterprise Edition.

Danger

The two methods are incompatible. It is recommended to use only one method in a cluster.

Manage services with script

You can use the nebula.service script to start, stop, restart, terminate, and check the Nebula Graph services.

Note

nebula.service is stored in the /usr/local/nebula/scripts directory by default. If you have customized the path, use the actual path in your environment.

Syntax

$ sudo /usr/local/nebula/scripts/nebula.service
[-v] [-c <config_file_path>]
<start | stop | restart | kill | status>
<metad | graphd | storaged | all>
Parameter Description
-v Display detailed debugging information.
-c Specify the configuration file path. The default path is /usr/local/nebula/etc/.
start Start the target services.
stop Stop the target services.
restart Restart the target services.
kill Terminate the target services.
status Check the status of the target services.
metad Set the Meta Service as the target service.
graphd Set the Graph Service as the target service.
storaged Set the Storage Service as the target service.
all Set all the Nebula Graph services as the target services.

Manage services with systemd

For easy maintenance, Nebula Graph Enterprise Edition supports managing services with systemd. You can start, stop, restart, and check services with systemctl commands.

Note

  • After installing Nebula Graph Enterprise Edition, the .service files required by systemd are located in the etc/unit path in the installation directory. Nebula Graph installed with the RPM/DEB package automatically places the .service files into the path /usr/lib/systemd/system and the parameter ExecStart is generated based on the specified Nebula Graph installation path, so you can use systemctl commands directly.
  • The systemctl commands cannot be used to manage the Enterprise Edition cluster that is created with Dashboard of the Enterprise Edition.
  • Otherwise, users need to move the .service files manually into the directory /usr/lib/systemd/system, and modify the file path of the parameter ExecStart in the .service files.

Syntax

$ systemctl <start | stop | restart | status > <nebula | nebula-metad | nebula-graphd | nebula-storaged>
Parameter Description
start Start the target services.
stop Stop the target services.
restart Restart the target services.
status Check the status of the target services.
nebula Set all the Nebula Graph services as the target services.
nebula-metad Set the Meta Service as the target service.
nebula-graphd Set the Graph Service as the target service.
nebula-storaged Set the Storage Service as the target service.

Start Nebula Graph

In non-container environment

Run the following command to start Nebula Graph.

$ sudo /usr/local/nebula/scripts/nebula.service start all
[INFO] Starting nebula-metad...
[INFO] Done
[INFO] Starting nebula-graphd...
[INFO] Done
[INFO] Starting nebula-storaged...
[INFO] Done

Users can also run the following command:

$ systemctl start nebula

If users want to automatically start Nebula Graph when the machine starts, run the following command:

$ systemctl enable nebula

In docker container (deployed with docker-compose)

Run the following command in the nebula-docker-compose/ directory to start Nebula Graph.

[nebula-docker-compose]$ docker-compose up -d
Building with native build. Learn about native build in Compose here: https://docs.docker.com/go/compose-native-build/
Creating network "nebula-docker-compose_nebula-net" with the default driver
Creating nebula-docker-compose_metad0_1 ... done
Creating nebula-docker-compose_metad2_1 ... done
Creating nebula-docker-compose_metad1_1 ... done
Creating nebula-docker-compose_storaged2_1 ... done
Creating nebula-docker-compose_graphd1_1   ... done
Creating nebula-docker-compose_storaged1_1 ... done
Creating nebula-docker-compose_storaged0_1 ... done
Creating nebula-docker-compose_graphd2_1   ... done
Creating nebula-docker-compose_graphd_1    ... done

Stop Nebula Graph

Danger

Do not run kill -9 to forcibly terminate the processes. Otherwise, there is a low probability of data loss.

In non-container environment

Run the following command to stop Nebula Graph.

$ sudo /usr/local/nebula/scripts/nebula.service stop all
[INFO] Stopping nebula-metad...
[INFO] Done
[INFO] Stopping nebula-graphd...
[INFO] Done
[INFO] Stopping nebula-storaged...
[INFO] Done

Users can also run the following command:

$ systemctl stop nebula

In docker container (deployed with docker-compose)

Run the following command in the nebula-docker-compose/ directory to stop Nebula Graph.

nebula-docker-compose]$ docker-compose down
Stopping nebula-docker-compose_graphd_1    ... done
Stopping nebula-docker-compose_graphd2_1   ... done
Stopping nebula-docker-compose_storaged0_1 ... done
Stopping nebula-docker-compose_storaged1_1 ... done
Stopping nebula-docker-compose_graphd1_1   ... done
Stopping nebula-docker-compose_storaged2_1 ... done
Stopping nebula-docker-compose_metad1_1    ... done
Stopping nebula-docker-compose_metad2_1    ... done
Stopping nebula-docker-compose_metad0_1    ... done
Removing nebula-docker-compose_graphd_1    ... done
Removing nebula-docker-compose_graphd2_1   ... done
Removing nebula-docker-compose_storaged0_1 ... done
Removing nebula-docker-compose_storaged1_1 ... done
Removing nebula-docker-compose_graphd1_1   ... done
Removing nebula-docker-compose_storaged2_1 ... done
Removing nebula-docker-compose_metad1_1    ... done
Removing nebula-docker-compose_metad2_1    ... done
Removing nebula-docker-compose_metad0_1    ... done
Removing network nebula-docker-compose_nebula-net

Note

If you are using a developing or nightly version for testing and have compatibility issues, try to run docker-compose down -v to DELETE all data stored in Nebula Graph and import data again.

Check the service status

In non-container environment

Run the following command to check the service status of Nebula Graph.

$ sudo /usr/local/nebula/scripts/nebula.service status all
  • Nebula Graph is running normally if the following information is returned.

    INFO] nebula-metad(33fd35e): Running as 29020, Listening on 9559
    [INFO] nebula-graphd(33fd35e): Running as 29095, Listening on 9669
    [WARN] nebula-storaged after v3.0.0 will not start service until it is added to cluster.
    [WARN] See Manage Storage hosts:ADD HOSTS in https://docs.nebula-graph.io/
    [INFO] nebula-storaged(33fd35e): Running as 29147, Listening on 9779
    

    Note

    After starting Nebula Graph, the port of the nebula-storaged process is shown in red. Because the nebula-storaged process waits for the nebula-metad to add the current Storage service during the startup process. The Storage works after it receives the ready signal. Starting from Nebula Graph 3.0.0, the Meta service cannot directly read or write data in the Storage service that you add in the configuration file. The configuration file only registers the Storage service to the Meta service. You must run the ADD HOSTS command to enable the Meta to read and write data in the Storage service. For more information, see Manage Storage hosts.

  • If the returned result is similar to the following one, there is a problem. You may also go to the Nebula Graph community for help.
    [INFO] nebula-metad: Running as 25600, Listening on 9559
    [INFO] nebula-graphd: Exited
    [INFO] nebula-storaged: Running as 25646, Listening on 9779
    

Users can also run the following command:

$ systemctl status nebula
● nebula.service
   Loaded: loaded (/usr/lib/systemd/system/nebula.service; disabled; vendor preset: disabled)
   Active: active (exited) since 一 2022-03-28 04:13:24 UTC; 1h 47min ago
  Process: 21772 ExecStart=/usr/local/ent-nightly/scripts/nebula.service start all (code=exited, status=0/SUCCESS)
 Main PID: 21772 (code=exited, status=0/SUCCESS)
    Tasks: 325
   Memory: 424.5M
   CGroup: /system.slice/nebula.service
           ├─21789 /usr/local/ent-nightly/bin/nebula-metad --flagfile /usr/local/ent-nightly/etc/nebula-metad.conf
           ├─21827 /usr/local/ent-nightly/bin/nebula-graphd --flagfile /usr/local/ent-nightly/etc/nebula-graphd.conf
           └─21900 /usr/local/ent-nightly/bin/nebula-storaged --flagfile /usr/local/ent-nightly/etc/nebula-storaged.conf
3月 28 04:13:24 xxxxxx systemd[1]: Started nebula.service.
...

The Nebula Graph services consist of the Meta Service, Graph Service, and Storage Service. The configuration files for all three services are stored in the /usr/local/nebula/etc/ directory by default. You can check the configuration files according to the returned result to troubleshoot problems.

In docker container (deployed with docker-compose)

Run the following command in the nebula-docker-compose/ directory to check the service status of Nebula Graph.

nebula-docker-compose]$ docker-compose ps
            Name                             Command                  State                                             Ports
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
nebula-docker-compose_graphd1_1     /usr/local/nebula/bin/nebu ...   Up (healthy)   0.0.0.0:49223->19669/tcp, 0.0.0.0:49222->19670/tcp, 0.0.0.0:49224->9669/tcp
nebula-docker-compose_graphd2_1     /usr/local/nebula/bin/nebu ...   Up (healthy)   0.0.0.0:49229->19669/tcp, 0.0.0.0:49228->19670/tcp, 0.0.0.0:49230->9669/tcp
nebula-docker-compose_graphd_1      /usr/local/nebula/bin/nebu ...   Up (healthy)   0.0.0.0:49221->19669/tcp, 0.0.0.0:49220->19670/tcp, 0.0.0.0:9669->9669/tcp
nebula-docker-compose_metad0_1      ./bin/nebula-metad --flagf ...   Up (healthy)   0.0.0.0:49212->19559/tcp, 0.0.0.0:49211->19560/tcp, 0.0.0.0:49213->9559/tcp,
                                                                                    9560/tcp
nebula-docker-compose_metad1_1      ./bin/nebula-metad --flagf ...   Up (healthy)   0.0.0.0:49209->19559/tcp, 0.0.0.0:49208->19560/tcp, 0.0.0.0:49210->9559/tcp,
                                                                                    9560/tcp
nebula-docker-compose_metad2_1      ./bin/nebula-metad --flagf ...   Up (healthy)   0.0.0.0:49206->19559/tcp, 0.0.0.0:49205->19560/tcp, 0.0.0.0:49207->9559/tcp,
                                                                                    9560/tcp
nebula-docker-compose_storaged0_1   ./bin/nebula-storaged --fl ...   Up (healthy)   0.0.0.0:49218->19779/tcp, 0.0.0.0:49217->19780/tcp, 9777/tcp, 9778/tcp,
                                                                                    0.0.0.0:49219->9779/tcp, 9780/tcp
nebula-docker-compose_storaged1_1   ./bin/nebula-storaged --fl ...   Up (healthy)   0.0.0.0:49215->19779/tcp, 0.0.0.0:49214->19780/tcp, 9777/tcp, 9778/tcp,
                                                                                     0.0.0.0:49216->9779/tcp, 9780/tcp
nebula-docker-compose_storaged2_1   ./bin/nebula-storaged --fl ...   Up (healthy)   0.0.0.0:49226->19779/tcp, 0.0.0.0:49225->19780/tcp, 9777/tcp, 9778/tcp,
                                                                                    0.0.0.0:49227->9779/tcp, 9780/tcp

If the service is abnormal, you can first confirm the abnormal container name (such as nebula-docker-compose_graphd2_1).

Then you can execute docker ps to view the corresponding CONTAINER ID (such as 2a6c56c405f5).

[nebula-docker-compose]$ docker ps
CONTAINER ID   IMAGE                               COMMAND                  CREATED          STATUS                    PORTS                                                                                                  NAMES
2a6c56c405f5   vesoft/nebula-graphd:nightly     "/usr/local/nebula/b…"   36 minutes ago   Up 36 minutes (healthy)   0.0.0.0:49230->9669/tcp, 0.0.0.0:49229->19669/tcp, 0.0.0.0:49228->19670/tcp                            nebula-docker-compose_graphd2_1
7042e0a8e83d   vesoft/nebula-storaged:nightly   "./bin/nebula-storag…"   36 minutes ago   Up 36 minutes (healthy)   9777-9778/tcp, 9780/tcp, 0.0.0.0:49227->9779/tcp, 0.0.0.0:49226->19779/tcp, 0.0.0.0:49225->19780/tcp   nebula-docker-compose_storaged2_1
18e3ea63ad65   vesoft/nebula-storaged:nightly   "./bin/nebula-storag…"   36 minutes ago   Up 36 minutes (healthy)   9777-9778/tcp, 9780/tcp, 0.0.0.0:49219->9779/tcp, 0.0.0.0:49218->19779/tcp, 0.0.0.0:49217->19780/tcp   nebula-docker-compose_storaged0_1
4dcabfe8677a   vesoft/nebula-graphd:nightly     "/usr/local/nebula/b…"   36 minutes ago   Up 36 minutes (healthy)   0.0.0.0:49224->9669/tcp, 0.0.0.0:49223->19669/tcp, 0.0.0.0:49222->19670/tcp                            nebula-docker-compose_graphd1_1
a74054c6ae25   vesoft/nebula-graphd:nightly     "/usr/local/nebula/b…"   36 minutes ago   Up 36 minutes (healthy)   0.0.0.0:9669->9669/tcp, 0.0.0.0:49221->19669/tcp, 0.0.0.0:49220->19670/tcp                             nebula-docker-compose_graphd_1
880025a3858c   vesoft/nebula-storaged:nightly   "./bin/nebula-storag…"   36 minutes ago   Up 36 minutes (healthy)   9777-9778/tcp, 9780/tcp, 0.0.0.0:49216->9779/tcp, 0.0.0.0:49215->19779/tcp, 0.0.0.0:49214->19780/tcp   nebula-docker-compose_storaged1_1
45736a32a23a   vesoft/nebula-metad:nightly      "./bin/nebula-metad …"   36 minutes ago   Up 36 minutes (healthy)   9560/tcp, 0.0.0.0:49213->9559/tcp, 0.0.0.0:49212->19559/tcp, 0.0.0.0:49211->19560/tcp                  nebula-docker-compose_metad0_1
3b2c90eb073e   vesoft/nebula-metad:nightly      "./bin/nebula-metad …"   36 minutes ago   Up 36 minutes (healthy)   9560/tcp, 0.0.0.0:49207->9559/tcp, 0.0.0.0:49206->19559/tcp, 0.0.0.0:49205->19560/tcp                  nebula-docker-compose_metad2_1
7bb31b7a5b3f   vesoft/nebula-metad:nightly      "./bin/nebula-metad …"   36 minutes ago   Up 36 minutes (healthy)   9560/tcp, 0.0.0.0:49210->9559/tcp, 0.0.0.0:49209->19559/tcp, 0.0.0.0:49208->19560/tcp                  nebula-docker-compose_metad1_1

Use the CONTAINER ID to log in the container and troubleshoot.

nebula-docker-compose]$ docker exec -it 2a6c56c405f5 bash
[root@2a6c56c405f5 nebula]#

Next to do

Connect to Nebula Graph


Last update: August 30, 2021