knowledge/technology/linux/systemd/systemd-resolved.md

obj	arch-wiki
application	https://wiki.archlinux.org/title/Systemd-resolved

systemd-resolved

systemd-resolved is a systemd service that provides network name resolution to local applications via a D-Bus interface, the resolve NSS service, and a local DNS stub listener on 127.0.0.53.

resolvectl

Send control commands to the network name resolution manager, or
resolve domain names, IPv4 and IPv6 addresses, DNS records, and services.

Usage: resolvectl [OPTIONS...] COMMAND ...

Commands:

  query HOSTNAME|ADDRESS...    Resolve domain names, IPv4 and IPv6 addresses
  service [[NAME] TYPE] DOMAIN Resolve service (SRV)
  openpgp EMAIL@DOMAIN...      Query OpenPGP public key
  tlsa DOMAIN[:PORT]...        Query TLS public key
  status [LINK...]             Show link and server status
  statistics                   Show resolver statistics
  reset-statistics             Reset resolver statistics
  flush-caches                 Flush all local DNS caches
  reset-server-features        Forget learnt DNS server feature levels
  monitor                      Monitor DNS queries
  show-cache                   Show cache contents
  show-server-state            Show servers state
  dns [LINK [SERVER...]]       Get/set per-interface DNS server address
  domain [LINK [DOMAIN...]]    Get/set per-interface search domain
  default-route [LINK [BOOL]]  Get/set per-interface default route flag
  llmnr [LINK [MODE]]          Get/set per-interface LLMNR mode
  mdns [LINK [MODE]]           Get/set per-interface MulticastDNS mode
  dnsovertls [LINK [MODE]]     Get/set per-interface DNS-over-TLS mode
  dnssec [LINK [MODE]]         Get/set per-interface DNSSEC mode
  nta [LINK [DOMAIN...]]       Get/set per-interface DNSSEC NTA
  revert LINK                  Revert per-interface configuration
  log-level [LEVEL]            Get/set logging threshold for systemd-resolved