shell-things/etc/hosts/README.md

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# `/etc/hosts`
This file is DNS before DNS and legacy remain which is still used.
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- [`blocklist`](#blocklist)
- [`dns`](#dns)
- [`hostname`](#hostname)
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- [`hosts.arch`](#hostsarch)
- [`hosts.fedora`](#hostsfedora)
- [`hosts.debian`](#hostsdebian)
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- [`hosts.steamos`](#hostssteamos)
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## `blocklist`
Hosts that I dislike enough to mention in my `hosts` file.
## `dns`
This began from question why should I have DNS to have DNS, but having it on
DNS resolver level broke DNSSEC due to my weird mixing of systemd-resolved and
Unbound, so now it's something I can attempt to `/etc/hosts`.
**_EXCERCISE CAUTION!_**
## `hostname`
As can be seen in `hosts.debian`, Debian specifies hostname in format such as:
```
::1 localhost
::1 FQDN UQDN
127.0.0.1 localhost
127.0.1.1 FQDN UQDN
```
where FQDN means _Fully Qualified Domain Name_ and UQDN _Unqualified Domain
Name_ (although I don't know if anyone else calls it like that) and I find
that a good practice. Additionally I have observed my systems querying their
own hostname from global DNS which seems unnecessary and not a great behaviour
to me, while this file appended to `/etc/hosts` can tell it immediately all
applications and make `resolvectl query hostname.localdomain` find it
instantly.
The `0200:0000:0000:0000:0000:0000:0000:0000`? Replace it with your Yggdrasil
address from `yggdrasilctl getself`.
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## `hosts.arch`
For now this is a symlink to `hosts.steamos` as I am pretty sure they haven't
modified it.
## `hosts.fedora`
I am pretty sure this is the `/etc/hosts` that was given me by Fedora < 40
with changes removed.
## `hosts.debian`
I think this is the Debian format which used to be just `../hosts` in this
repository.
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## `hosts.steamos`
The `/etc/hosts` file from `SteamOS Holo` variant steamdeck version `3.5.19`
or `20240422.1`.