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In this video I'll tell you about
managing hostname for correct operations. It's important

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that Linux hosts have the right name
set and also hostname resolution is required

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as often reversed host name lookups
are performed in communication between hosts.

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I would say if ever you
see that your system is slow in

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whatever it is doing on the
network, check on your host name resolution.

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First step is to use hostnamectl
to set the host name and

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configure the etc host file
with the appropriate hostname lookup settings.

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And at the network level, hostname resolution is
handled by DNS, which is Domain Name Services.

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DNS is typically taken care of by
your network administrator, but as a Linux user

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you should know how to configure local
hostname resolution using etchosts. Let's check it out.

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So what happens if
I use hostname? Well,

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hostname is showing my
hostname linfen.example.org and hostnamectl.

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Let's use tab completion that allows you to get
information about your hostname. Use hostnamectl hostname if you

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want to change it. I already did that and
I'm quite happy with it. So I'm just going

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to use hostnamectl status where we can see
all the information obtained about my current host.

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In order to make sure
that hostname resolution is set up

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correctly, use sudo vim on
etchosts. What do we see?

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Well, we see localhost and if you want
to add a remote host, the only thing you

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need to do is to find the IP
address and add the host name ubuntu.example.org which is

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also known as Ubuntu. It's common that your
host names have a long name, the fqdn, the

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fully qualified distinguished name, as well as
a short name, Ubuntu in this case.

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And if everything went all right, well, then I should be able
to ping Ubuntu and that's working. So we should be good here.