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- [Instructor] Hi and welcome back.

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In this video we're going to
be adding our DNS records.

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Now I am here at rest-api-course-trial.com

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in Cloudflare, and all that I have done,

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as I zoom in so you can see it easier,

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all that I have done is I have removed

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by pressing this cross icon

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all of the existing records.

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We don't need any of them,

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and also I want to start
sort of from a blank slate,

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explain everything that
we're adding what it means.

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The one thing I've not deleted

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that I'm gonna delete in a moment

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is this TXT type record.

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Now I've not deleted this

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because I wanted to
explain what this is for

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before deleting it, and
this TXT record here

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is used for when an email comes through

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to know that it should

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or rather that this domain
is a valid Namecheap domain

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and it is okay to forward
email that comes to this domain

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to the Namecheap domains.

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So this TXT record here is
just used to store a string,

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which in this case is this value here,

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against the domain.

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Oh, I didn't mean to do that.

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And then Namecheap can
check for this domain

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what this TXT field contains

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and it can make sure that it
contains exactly its value

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and if it does, that means it's a valid

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Namecheap domain that you
can use for email forwarding.

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Because we've not signed up
for emails with Namecheap

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we don't need this domain,
so we can delete it.

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And I am going to make
sure that it is deleted.

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So now we've deleted all our DNS records

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and we can readd them starting
from the first record.

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We've got a bunch of
records that we can add

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and as you can see here
we've got A, AAAA's, CNAME,

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MX, and a bunch more.

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The only ones we're
going to look at are A,

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AAAA, CNAME, MX and TXT.

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The A is exactly what you'd
expect a DNS record to be

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after the last couple of videos.

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The A record stores the IP address

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of the server that this domain points to.

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So when a DNS query comes through,

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this is a domain that
is going to be sent back

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to the person or the
server making the query.

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The name of the A record has
to be the name of the domain,

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so in this case rest-api-course-trial.com.

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And the IPv4 address has to
be the same as your droplet,

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so in this case 95.85.15.100.

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And the TTL, that's a time to live,

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we can just leave that at automatic,

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and we can also make sure the traffic

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to this host name is
going through Cloudflare.

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That's just going to make it a bit faster

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and that's it.

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The AAAA is used for IPv6 instead of IPv4.

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So if we go back to the Digital Ocean,

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you can see that we've got IPv4,

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and this is a domain,

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I'm sorry, an IP number with this format,

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up to three numbers separated
by dots, four of them.

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And we can enable IPv6.

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It's not free,

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so I don't recommend you do
that unless you really need to,

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but that is essentially a longer number.

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This is a longer number.

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IPv6 is longer because we are essentially

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running out of IPv4 numbers.

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We've got too many connected devices.

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We're running out of IPv4
numbers in the world,

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meaning each number has assigned a device,

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so that's why we're slowly migrating,

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very slowly, to IPv6, which is longer.

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Mbot is still not really widely used

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so you don't need to
worry about that for now.

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And we don't need that

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because we've got already an IPv4

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and we don't have an IPv6
address in our server

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so we're going to ignore the AAAA,

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but that's what this is for.

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And then we've got the CNAME.

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A CNAME record is used to
create an alias for a domain.

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So once again, the name of the record

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is what the alias is,

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and a domain name is what
domain name it's pointing to.

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In the same way that
an A record is a name,

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rest-api-course-trial.com,
that points to a IP address,

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a CNAME is a name that points
to another domain name.

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So what's the point of this?

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Well, this is normally used
to do things like this.

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Make sure that when somebody goes to

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www.rest-api-course-trial.com
it sends them over

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to rest-api-course-trial.com.

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This is normally what it's for.

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And as you can see it shortens it to

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www is an alias of
rest-api-course-trial.com.

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Okay.

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Then we're going to have MX records.

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These are used for email
exchange, mail exchange.

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It is very likely if
you use a mail provider,

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such as Zoho, which are
providers of custom mail,

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that they'll ask you to
create some MX domains

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in your DNS records so that they know

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or rather your email
incoming to your server

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knows to go somewhere else.

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And that's what the MX records are for.

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You create MX records with a given name

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and then depending on the configuration,

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they'll go to a different server.

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The email will go to a different server,

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and that's where your mail provider

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will look for the emails when they arrive.

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Not something we're
going to set up just now

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but if you do want an email address

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that is for example your name
at rest-api-course-trial.com

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you're going to need to
set up some MX records

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and your mail provider will
tell you how to do that.

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And finally we have TXT
records which, as I said,

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are just a name, that's
just the name of the record,

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and a value that you can store amongst,

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sorry, alongside your domain.

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And this is normally used
for verification purposes.

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Basically a website will ask you to create

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a specific TXT record,

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and then they will check that it exists,

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and if it does, it
means that you were able

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to create the record,

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which means you are the
owner of the domain.

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That's what these are normally used for.

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But again, we don't need
one of these right now,

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but just now that this is something that

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sometimes you will get asked for.

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And so that's what that is for.

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Okay, and we don't need anything else.

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So, we've got our A record and
we've got our CNAME record,

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and that points to our
Digital Ocean droplet.

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So that's it.

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We are sorted.

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I'm going to zoom out of here,

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and our DNS records are now set

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and soon, within a few hours,

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normally quite quickly, if you go to

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rest-api-course-trial.com

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you'll be able to see your IP address,

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or rather, if we've got

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the API deployed to this IP address

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we'll be able to use our API just with

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rest-api-course-trial.com

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as if we were using the IP address.

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So that's everything for this video

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and I'll see you on the next one.