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Ubuntu 服务器 18.04-Netplan 没有 IP 地址

tag-icon • tag-icon networking server dhcp netplan
Ubuntu 服务器 18.04-Netplan 没有 IP 地址

背景：

硬件：Thinkpad X301

在安装 Ubuntu 18.04.1 Server（64 位）时，安装卡在网络设置部分。网络设置超时，似乎没有为以太网接口（在本例中为 enp0s25）分配 IP 地址。

我下载了替代安装程序，安装过程顺利，DHCP 自动配置（在 16.04 服务器安装中也能完美运行）。但是安装后，18.04 挂在“等待网络配置”消息处。2 分钟后，它继续运行并允许我访问终端。

配置

启动后 ifconfig 的输出

enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::222:68ff:fe0c:bf44  prefixlen 64  scopeid 0x20<link>
        ether 00:22:68:0c:bf:44  txqueuelen 1000  (Ethernet)
        RX packets 225  bytes 59069 (59.0 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 20  bytes 3686 (3.6 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xf0600000-f0620000  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 528  bytes 32112 (32.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 528  bytes 32112 (32.1 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

启动后 ip addr show 的输出

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:22:68:0c:bf:44 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::222:68ff:fe0c:bf44/64 scope link 
       valid_lft forever preferred_lft forever
3: wls1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:21:6a:1d:ee:fe brd ff:ff:ff:ff:ff:ff

01-netcfg.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s25:
      dhcp4: true

临时解决方案

尝试使用sudo ip addr add 192.168.0.107 dev enp0s25 - IP 已分配给接口，但没有互联网

然后我尝试sudo dhclient -v enp0s25 - 分配一个 IP 并上网

sudo dhclient -v enp0s25 后的输出

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:22:68:0c:bf:44 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.107/24 brd 192.168.0.255 scope global enp0s25
       valid_lft forever preferred_lft forever
    inet6 fe80::222:68ff:fe0c:bf44/64 scope link 
       valid_lft forever preferred_lft forever
3: wls1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:21:6a:1d:ee:fe brd ff:ff:ff:ff:ff:ff

总结 - 问题

为了让 ubuntu 在启动时自行获取动态 IP 地址，需要进行哪些更改？

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