Number one, what is a Fully Qualified Domain Name? Secondly, how do I check to see if it is set up (what command line do I enter)? Thirdly, if it is not set up, then, how do I go about setting it up?
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FQDN or Fully Qualified Domain Name is your Droplet’s full hostname. Usually, you are able to ping your Droplet with that FQDN and it’s used for PTR records.
To set one, you need to enter your Droplet via SSH and:
Change the hostname using hostnamectl
The first step once you have entered the droplet would be to use the
hostnamectlcommand. Let’s say we want to name our droplet ‘ExampleName’. To do so, we need to execute the command like so
The hostnamectl command does not produce output. On success, 0 is returned, a non-zero failure code otherwise.
Update the /etc/hosts file
Next on our list would be to update the hosts file located in the etc folder. You can use any editor you want from nano, vi, vim.
In there you’ll see something similar to
Change the line which says the following
Save the file and exit.
That should be it.
DigitalOcean automatically configures the reverse dns entry (PTR) on their end. It will be the hostname you choose when you set up your dropplet. You can change/check this in the control panel by selecting your dropplet, then settings, then rename. As it says, changing the name there will update the PTR but not the hostname of the system, that is something you will need to do, instructions for that vary depending on the system you have installed.
Hope this helps! Let me know if you have any questions.