Скачать или смотреть Troubleshooting Telegraf Connection to Mosquitto Using TLS

Discover how to fix Telegraf's connectivity issues with Mosquitto when using TLS encryption. Gain insights on proper configuration for successful message transfer.
---
This video is based on the question https://stackoverflow.com/q/65702577/ asked by the user 'Lorenzo' ( https://stackoverflow.com/u/1228308/ ) and on the answer https://stackoverflow.com/a/65704266/ provided by the user 'hardillb' ( https://stackoverflow.com/u/504554/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Telegraf connection to Mosquitto using TLS

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Troubleshooting Telegraf Connection to Mosquitto Using TLS

If you're working with a setup that includes Raspberry Pi, sensors, Mosquitto, Telegraf, InfluxDB, and Grafana, you may encounter issues when transitioning from an unsecured connection to a secure one using TLS. Let's break down the problem and provide detailed steps to resolve connectivity issues with Telegraf to your Mosquitto broker when TLS is activated.

Understanding the Problem

In your system, sensors publish data to Mosquitto, and Telegraf is responsible for transferring that data to an InfluxDB database for visualization in Grafana. However, when you activate TLS in Mosquitto, your Telegraf setup has trouble receiving data, even though the sensor data reaches the broker successfully using TLS certificates.

Symptoms of the Issue

Telegraf service is active and running but not receiving any data.

No apparent errors in the Telegraf journal logs, but the connection seems to be misconfigured for the TLS setup.

Solution: Correcting the Telegraf Configuration

To resolve the connectivity issue with Telegraf when using TLS, you'll need to make adjustments to your Telegraf configuration file. Here's how to properly set up the connection:

1. Change the MQTT URL Protocol

The key change that needs to be made is in the MQTT URL used in the Telegraf configuration. Your original configuration has the URL starting with tcp://, which is incorrect for a secure TLS connection. Instead, you should be using ssl:// as shown below.

Original Configuration

[[See Video to Reveal this Text or Code Snippet]]

Corrected Configuration

[[See Video to Reveal this Text or Code Snippet]]

2. Verify TLS File Paths

Ensure that the paths to your TLS certificates (CA, client certificate, client key) are correctly specified in the Telegraf configuration. Here's a quick review of how that section should look:

[[See Video to Reveal this Text or Code Snippet]]

Make sure that these files have the correct permissions for the Telegraf service to read them.

3. Connection Testing

After making the changes, test the connection to the Mosquitto broker again. You can use the following methods to ensure a successful connection:

Check Telegraf Logs: Use the command journalctl -u telegraf.service to see if there are any connection-related logs.

Monitor Mosquitto Logs: Verify the Mosquitto broker logs to ensure it records a connection attempt from Telegraf.

4. Ensure Proper Client Identification

If you’re using a static client ID, ensure that the client ID you assigned does not collide with that of other clients. This can prevent successful connections.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By correcting the MQTT URL protocol in your Telegraf configuration from tcp:// to ssl://, ensuring the paths to your TLS certificate files are accurate, and verifying your connection status through logs, you should be able to establish a successful connection between Telegraf and Mosquitto with TLS enabled. This adjustment secures your data while maintaining the flow from sensors to your databases and dashboards.

If you follow these configuration steps and continue to have issues, consider checking firewall settings or other network configurations that could affect the connection.

Happy monitoring!