Ubuntu-18.04配置静态IP和之前版本有所不同,需要通过netplan工具配置
推荐-通过netplan工具同时更改IP和DNS
Ubuntu-18.04配置静态IP需要更改netplan的yaml文件,而非之前的/etc/network/interfaces
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| $ sudo vim /etc/netplan/00-installer-config.yaml network: ethernets: ens160: dhcp4: no addresses: - 192.168.80.10/24 gateway4: 192.168.80.2 nameservers: addresses: - 192.168.80.2 - 223.5.5.5 search: [] optional: true version: 2 $ sudo netplan apply $ networkctl status ● State: routable Address: 192.168.80.10 on ens160 fe80::20c:29ff:fe18:95a3 on ens160 Gateway: 192.168.80.2 on ens160 DNS: 192.168.80.2 223.5.5.5 # 更改软链接到正确的resolv.conf文件(原因如下说明) $ sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf
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通过systemd-resolved服务更改DNS,此为全局DNS,优先于netplan配置
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| # 默认系统DNS查询走的是本地127,即通过systemd-resolved服务 $ dig baidu.com ... ;; Query time: 6 msec ;; SERVER: 127.0.0.53#53(127.0.0.53) ... $ more /etc/resolv.conf nameserver 127.0.0.53 options edns0 $ sudo ss -tunlp Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port udp UNCONN 0 0 127.0.0.53%lo:53 0.0.0.0:* users:(("systemd-resolve",pid=2200,fd=12)) tcp LISTEN 0 128 127.0.0.53%lo:53 0.0.0.0:* users:(("systemd-resolve",pid=2200,fd=13)) tcp LISTEN 0 128 0.0.0.0:22 0.0.0.0:* users:(("sshd",pid=1158,fd=3)) # 更改系统DNS配置并重启systemd-resolved服务 $ sudo vim /etc/systemd/resolved.conf [Resolve] DNS=192.168.80.2 223.5.5.5 LLMNR=no $ sudo systemctl restart systemd-resolved.service $ systemd-resolve --status Global DNS Servers: 192.168.80.2 223.5.5.5 DNSSEC NTA: 10.in-addr.arpa ... # 但是查看resolv.conf文件还是127?发现这个文件是个软链接,而且链接的原文件配置有问题 $ more /etc/resolv.conf nameserver 127.0.0.53 options edns0 $ ll /etc/resolv.conf lrwxrwxrwx 1 root root 39 Aug 6 22:35 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf $ ll /run/systemd/resolve/ -rw-r--r-- 1 systemd-resolve systemd-resolve 610 Dec 14 15:05 resolv.conf -rw-r--r-- 1 systemd-resolve systemd-resolve 715 Dec 14 15:05 stub-resolv.conf $ more /run/systemd/resolve/resolv.conf nameserver 192.168.80.2 nameserver 223.5.5.5 $ more /run/systemd/resolve/stub-resolv.conf nameserver 127.0.0.53 options edns0 # 更改软链接到正确的resolv.conf文件 $ sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf $ more /etc/resolv.conf nameserver 192.168.80.2 nameserver 223.5.5.5 # 再次测试DNS查询结果返回的SERVER地址就正常了 $ dig baidu.com ... ;; Query time: 0 msec ;; SERVER: 192.168.80.2#53(192.168.80.2)
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