FQDN in AWS Greengrass Core v2

Question

Hello, in my work asked me for the FQDN (fully qualified domain name) for AWS Greengrass Core v2 and i supposed that there are one different for every core device, but I dont know where I can get this information. I hope that anyone can help me, I have been looking for but I don't found anthing.

re:Post Agent · Answer

If you need to connect client devices to your Greengrass v2 core device using MQTT, you'll need to ensure that the FQDN or IP address of the core device is present in the broker certificate.

**Sources**

[Connecting client devices to an AWS IoT Greengrass Core device with an MQTT broker - AWS IoT Greengrass](https://docs.aws.amazon.com/greengrass/v2/developerguide/connecting-to-mqtt.html)

The FQDN would be the host were Greengrass is running. Within the environment where the Greeengrass Core device is running, do a reverse DNS lookup of the IP address. If running on Linux, this command will work assuming a host entry has been made for the device:

echo "IP Address: $(hostname -I | awk '{print $1}') FQDN: $(hostname -f)"

Note: the commands may vary based on Linux distro.

echo "IP Address: $(hostname -I | awk '{print $1}') FQDN: $(hostname -f)"

Gavin_A · Answer

The FQDN would be the host were Greengrass is running. Within the environment where the Greeengrass Core device is running, do a reverse DNS lookup of the IP address. If running on Linux, this command will work assuming a host entry has been made for the device:

echo "IP Address: $(hostname -I | awk '{print $1}') FQDN: $(hostname -f)"

Note: the commands may vary based on Linux distro.

```shell
echo "IP Address: $(hostname -I | awk '{print $1}') FQDN: $(hostname -f)"
```

Note: the commands may vary based on Linux distro.

FQDN in AWS Greengrass Core v2

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