Learn what to do if ndo2db is not running. Our Server Management Support team is here to help you with your questions and concerns.

ndo2db is not running | Resolved

Did you know that Nagios uses two separate processes to operate?

They go by the names Nagios Core and ndo2db. The former collects and processes monitoring data, while the latter is a daemon. The ndo2db interfaces with the Nagios Core to write the monitoring data to a database.

If you have been coming across the “ndo2db is not running” error while using Nagios, you are in the right place. This error message usually indicates that the ndo2db daemon is currently not active or refuses to start.

According to our experts, the error may be due to different reasons like configuration issues, permission problems, or resource constraints on the server.

We can find out the root cause behind the error by taking a look at the Nagios log files for error messages related to ndo2db. These logs are located in the /var/log/nagios directory on the server.

In case the log files indicate that ndo2db is crashing or failing to start, we have to check the configuration files for errors or try restarting the daemon manually.

According to our experts, the issue may be related to database connectivity in some cases. The ndo2db process requires a working database connection to function smoothly.

In other words, ndo2b needs database connectivity since it stores performance and status data in the database. This promotes efficient querying and reporting. In fact, ndo2db is designed to work with a database backend like MySQL, PostgreSQL, or Oracle.

In case the database is down or inaccessible, ndo2db fails to start leading to the “ndo2db is not running” error message. Then, we have to check the database logs or configuration files for errors and verify that the correct database credentials are used in the ndo2db configuration file.

Troubleshooting

1. If you come across the ndo2db is not running error, our experts suggest stopping the Nagios service:

   # service nagios stop
2. Then, we have to run the ‘ls’ command as seen below:

   # ls -l /usr/local/nagios/var/ndo*
3. Now, we will see an output similar to the one below:

   


4. At this point, we have to rename or move the ndo2db.lock and ndo.sock files as seen here:

   # mv /usr/local/nagios/var/ndo2db.lock /usr/local/nagios/var/ndo2db.lock.bak
# mv /usr/local/nagios/var/ndo.sock /usr/local/nagios/var/ndo.sock.bak
5. Now, we have to restart the Nagios service and ndo2db service using the commands seen below:

   # service nagios start
# service ndo2db start
6. Finally, run the service status command and verify if it is now running. At this point, we will see the red exclamation change in the web status as well.

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Conclusion

In summary, our Support Techs demonstrated how to resolve the “ndo2db is not running” error.