Systemd-resolve

systemd-resolved is a systemd service that provides network name resolution to local applications via a D-Bus interface.

http://man7.org/linux/man-pages/man1/systemd-resolve.1.html

• systemd-resolve --help
• systemd-resolve --status
• systemd-resolve --flush-caches

Related files:

• /etc/hosts
• /etc/resolv.conf
• /etc/systemd/resolved.conf

Related packages:

• resolvconf

Examples

systemd-resolve
No arguments passed.

systemd-resolve 
sd_bus_open_system: No such file or directory

systemd-resolve --status
Failed to get global data: Could not activate remote peer.

systemd-resolve --statistics
DNSSEC supported by current servers: no

Transactions
Current Transactions: 5
  Total Transactions: 1707886

Cache
  Current Cache Size: 75
          Cache Hits: 1042506
        Cache Misses: 805902

DNSSEC Verdicts
              Secure: 0
            Insecure: 0
               Bogus: 0
       Indeterminate: 0

See also

• systemd-resolve: systemd-resolve --help, systemd-resolve --status, /etc/systemd/resolved.conf, systemd-resolve --statistics, resolvectl status, journalctl -u systemd-resolved, systemd-resolve --set-dns, systemctl start systemd-resolved
• Systemd: systemctl, systemd-journald, journalctl systemd-cat, systemd-logind, systemd-networkd:networkctl, systemd-timesyncd, systemd-resolved, systemd-udevd , Systemd-logind: loginctl, hostnamectl, udevadm, systemd-run, portablectl, systemd-nspawn, systemd resource management, Timer (systemd), systemd logs, /etc/systemd/, systemd services, systemd-mount, /run/systemd/, .service, /usr/lib/systemd/, /usr/lib/systemd/system/, /usr/lib/systemd/system/systemd-resolved.service, /lib/systemd/, machinectl, systemd-oomd, systemd-analyze
• DNS: Linux DNS, IP, systemd-resolve, /etc/hosts, whois, Domain registrar, dig, host, nslookup, scutil --dns dnsmasq, bind, delv, .local, .internal, .onion, FQDN, TTL, /etc/resolv.conf, /etc/systemd/resolved.conf, dscacheutil (macOS), hostname, hostnamectl, bind, resolvectl status, DNS sinkhole, Domain name server, LLMNR, Resource records:MX, TXT, NS, CAA, SSHFP, Apex, CNAME, Wildcard DNS records, Subdomain, /etc/nsswitch.conf, 1.1.1.1, 8.8.8.8, CoreDNS, dnsPolicy:, Google Public DNS, DNS caches, Kubernetes ExternalDNS, DNS forwarding, IDNA2008, DNS-1035, Domain name registrars, Split-view DNS, Pi-hole, NextDNS
• DHCP: Cisco IOS DHCP Server, isc-dhcp-server (dhcpd.conf), ip dhcp pool show ip dhcp pool, show ip dhcp binding, show ip dhcp conflict, show ip dhcp server statistics, DHCP snooping, client-identifier, hardware-address, show ip dhcp, ip link, dhcpcd, AWS::EC2::DHCPOptions, dhclient, systemd-networkd
• Netplan: netplan try, netplan apply, examples, networkd

https://wiki.ubuntu.com/DebuggingSystemd