systemd-resolved has a DBUS API, which is used by network configuration
managers such as systemd-networkd and NetworkManager to set the hostname
resolution -related configuration to be used by systemd-resolved.
You can see the runtime configuration of systemd-resolved by running
`systemd-resolve --status`. To see what protocols (DNS, LLMNR, MDNS) are
used to resolve a specific hostname, use `systemd-resolve
somemachine.local`, for example.
The protocols that are used during hostname resolution can be toggled
per-interface using the same command, or they can be set via the DBUS
API by some network configuration manager.
Caution: The following is "as far as I know":
Please note that the systemd-resolved DBUS API provides methods to do
hostname resolution with more control over the resolution method than
the functions provided by GNU C libraries. These latter functions
inspect `hosts:` entry of `/etc/nsswitch.conf` to determine plugins that
are used to do hostname resolution, one of which should be `resolve` to
direct queries to systemd-resolved in case the GNU C hostname resolution
API is used.
Sorry if this veered into the territory of "I didn't ask this question".
I just thought that clarifying the whole picture could help in better
setting up hostname resolution.
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