1.常用公共 DNS国内稳定阿里223.5.5.5 223.6.6.6114114.114.114.114 114.114.115.115Cloudflare1.1.1.1Google8.8.8.8 8.8.4.42.全局强制 DNS服务器首选根治各种解析失败修改/etc/systemd/resolved.conf所有网卡统一用固定 DNS不受 DHCP 覆盖。1.编辑配置sudo vim /etc/systemd/resolved.conf2.修改[Resolve]段落去掉注释#[Resolve] # 主DNS DNS223.5.5.5 114.114.114.114 # 备用DNS FallbackDNS1.1.1.1 8.8.8.8 Domains~. # 关闭DNSSEC避免解析异常 DNSSECno Cacheyes3.保存退出 :wq回车重启服务sudo systemctl restart systemd-resolved # 开机自启 sudo systemctl enable systemd-resolved # 重建软链接关键防止resolv.conf错乱 sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf4.验证当前生效 DNSresolvectl status # 测试域名解析 nslookup www.baidu.com # 输出如下 Server: 223.5.5.5 Address: 223.5.5.5#53 Non-authoritative answer: www.baidu.com canonical name www.a.shifen.com. Name: www.a.shifen.com Address: 110.242.69.21 Name: www.a.shifen.com Address: 110.242.70.57 Name: www.a.shifen.com Address: 2408:871a:2100:1b23:0:ff:b07a:7ebc Name: www.a.shifen.com Address: 2408:871a:2100:186c:0:ff:b07e:3fbc