Ubuntu24.04修改DNS

vi  /etc/systemd/resolved.conf

打开resolved.conf文件写入

DNS=8.8.8.8#dns.google 8.8.4.4#dns.google 2001:4860:4860::8888#dns.google 2001:4860:4860::8844#dns.google
FallbackDNS=1.1.1.1#cloudflare-dns.com 1.0.0.1#cloudflare-dns.com 2606:4700:4700::1111#cloudflare-dns.com 2606:4700:4700::1001#cloudflare-dns.com

重启systemd-resolved

systemctl status systemd-resolved  #查看状态，没有开机自启就enable一下。
systemctl enable systemd-resolved
systemctl restart systemd-resolved

打开/etc/netplan/50.cloud-init.yaml， dhcp4下添加两行，注意图中缩进

            nameservers:
                addresses: [8.8.8.8, 8.8.4.4]

应用设置

netplan apply
resolvectl status                    #查看生效的dns