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网络配置消失 - 无法重置或应用 Netplan

tag-icon • tag-icon networking 20.04 network-manager netplan
网络配置消失 - 无法重置或应用 Netplan

我不确定发生了什么。我运行一台 Ubuntu 20.04.2 LTS 机器，没有头。它在夜间的某个时候进行了更新，当我登录时，它提示我需要重新启动。所以我照做了，但是，它似乎没有恢复。

在将显示器连接到它之后，我发现它正在运行，但网络接口不起作用。实际上甚至没有出现，就像它刚刚被删除或移除一样。我会尝试在这里分享尽可能多的信息，但我只是不确定可能出了什么问题，老实说，我不知道还能去哪里查找。

尝试了以下所有方法后，我仍然无法连接互联网。更糟糕的是，重启后，在我的 LAN 上获取允许 SSH 的 IP 地址的唯一方法是使用：

$ sudo ip link set enp3s0 down
$ sudo ip link set enp3s0 up
$ sudo ip addr add 192.168.1.150/24 dev enp3s0

$ sudo lshw -class network
  *-network                 
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: enp3s0
       version: 0c
       serial: 2c:56:dc:97:80:9f
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=5.8.0-48-generic duplex=full firmware=rtl8168g-2_0.0.1 02/06/13 ip=192.168.1.150 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
       resources: irq:18 ioport:e000(size=256) memory:fea00000-fea00fff memory:f0800000-f0803fff

$ sudo nano /etc/netplan/netcfg.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    enp3s0:
      dhcp4: no
      addresses:
        - 192.168.1.150/24
      gateway4: 192.168.1.1
      nameservers:
          addresses: [8.8.8.8, 1.1.1.1]

重新启动后，上述netplan配置仍然存在，但是，某些行中添加了额外的间距 - 导致其失败。

$ ip a
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 2c:56:dc:97:80:9f brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.150/24 scope global enp3s0
       valid_lft forever preferred_lft forever
    inet6 2001:1970:4a26:8100:2e56:dcff:fe97:809f/64 scope global dynamic mngtmpaddr 
       valid_lft 86140sec preferred_lft 14140sec

$ ip route show
default via 192.168.1.1 dev enp3s0 
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 
172.18.0.0/16 dev br-5c71e5479641 proto kernel scope link src 172.18.0.1 
192.168.1.0/24 dev enp3s0 proto kernel scope link src 192.168.1.150

我只能让default via 192.168.1.1 dev enp3s0运行后出现的部分sudo ip route add default via 192.168.1.1。

$ sudo netplan --debug try
DEBUG:enp3s0 not found in {}
DEBUG:Merged config:
network:
  ethernets:
    enp3s0:
      addresses:
      - 192.168.1.150/24
      dhcp4: false
      gateway4: 192.168.1.1
      nameservers:
        addresses:
        - 8.8.8.8
        - 1.1.1.1
  renderer: networkd
  version: 2

DEBUG:New interfaces: set()
** (generate:53716): DEBUG: 22:58:01.445: Processing input file /etc/netplan/netcfg.yaml..
** (generate:53716): DEBUG: 22:58:01.445: starting new processing pass
** (generate:53716): DEBUG: 22:58:01.446: We have some netdefs, pass them through a final round of validation
** (generate:53716): DEBUG: 22:58:01.446: enp3s0: setting default backend to 1
** (generate:53716): DEBUG: 22:58:01.446: Configuration is valid
** (generate:53716): DEBUG: 22:58:01.446: Generating output files..

An error occurred: the configuration could not be generated

Reverting.
DEBUG:netplan generated networkd configuration changed, restarting networkd
DEBUG:enp3s0 not found in {}
DEBUG:Merged config:
network:
  ethernets:
    enp3s0:
      addresses:
      - 192.168.1.150/24
      dhcp4: false
      gateway4: 192.168.1.1
      nameservers:
        addresses:
        - 8.8.8.8
        - 1.1.1.1
  renderer: networkd
  version: 2

DEBUG:no netplan generated NM configuration exists
DEBUG:enp3s0 not found in {}
DEBUG:Merged config:
network:
  ethernets:
    enp3s0:
      addresses:
      - 192.168.1.150/24
      dhcp4: false
      gateway4: 192.168.1.1
      nameservers:
        addresses:
        - 8.8.8.8
        - 1.1.1.1
  renderer: networkd
  version: 2

DEBUG:Link changes: {}
DEBUG:netplan triggering .link rules for lo
DEBUG:netplan triggering .link rules for enp3s0
DEBUG:netplan triggering .link rules for br-5c71e5479641
DEBUG:netplan triggering .link rules for docker0
DEBUG:netplan triggering .link rules for vethf90fcb2
DEBUG:netplan triggering .link rules for veth71540be
DEBUG:netplan triggering .link rules for veth18e90b7
DEBUG:netplan triggering .link rules for vetheb58aaa
DEBUG:netplan triggering .link rules for veth728e8e9
DEBUG:netplan triggering .link rules for veth96def70
DEBUG:netplan triggering .link rules for vetha4b92ad
DEBUG:netplan triggering .link rules for vethd43e21c
DEBUG:netplan triggering .link rules for vethb777853
DEBUG:netplan triggering .link rules for veth2b054d4
DEBUG:netplan triggering .link rules for veth8f6354f
DEBUG:netplan triggering .link rules for vethc69182e
DEBUG:netplan triggering .link rules for veth9e52006
DEBUG:netplan triggering .link rules for veth9b90b02
DEBUG:netplan triggering .link rules for veth3f22dda
DEBUG:netplan triggering .link rules for vethc39e6d3
DEBUG:netplan triggering .link rules for vetha38ae56
DEBUG:netplan triggering .link rules for vethf68a144
DEBUG:enp3s0 not found in {}
DEBUG:Merged config:
network:
  ethernets:
    enp3s0:
      addresses:
      - 192.168.1.150/24
      dhcp4: false
      gateway4: 192.168.1.1
      nameservers:
        addresses:
        - 8.8.8.8
        - 1.1.1.1
  renderer: networkd
  version: 2

这是我所掌握的全部信息。我只是不确定哪里出了问题、怎么发生的、什么时候发生的。

非常感谢您的帮助。谢谢！

答案1

我在 Ubuntu 20.x 更新后也遇到了同样的网络离线问题。

我发现这个错误报告：https://bugs.launchpad.net/netplan/+bug/1922898

以下是我修复 Ubuntu 20.x 服务器的方法：

  1. 下载最新版本netplan.io_0.102：

    cd /tmp 
wget http://security.ubuntu.com/ubuntu/pool/main/n/netplan.io/netplan.io_0.102-0ubuntu1~20.04.1_amd64.deb

  2. 以 root 身份运行以下命令：

    sudo dpkg -i netplan.io_0.102-0ubuntu1~20.04.1_amd64.deb

  3. 确认netplan和libnetplan同步：

    $ sudo dpkg -l | grep netpl
libnetplan0:amd64                    0.102-0ubuntu1~20.04.1          amd64        YAML network configuration abstraction runtime library
netplan.io                           0.102-0ubuntu1~20.04.1          amd64        YAML network configuration abstraction for various backends

  4. 重启。

答案2

Google Cloud 用户：我在 GCP 的三台机器上遇到了同样的问题。由于无法传输文件，我无法直接实施 user15523715 提供的修复。但是，我能够通过以下修改来实现它。

  1. 创建或转到在 GCP 中运行的 Ubuntu VM

  2. 创建一个空白磁盘并附加。请参阅：https://cloud.google.com/compute/docs/disks/add-persistent-disk

  3. 通过 SSH 或控制台进入虚拟机并格式化和安装磁盘。请参阅：https://devopscube.com/mount-extra-disks-on-google-cloud/

  4. 将 netplan.io 下载到该磁盘

cd /demo-mount

wget http://security.ubuntu.com/ubuntu/pool/main/n/netplan.io/netplan.io_0.102-0ubuntu1~20.04.1_amd64.deb

  1. 卸载磁盘

sudo umount /demo-mount

  1. 从虚拟机中删除磁盘

  2. 将磁盘附加到受影响的虚拟机

  3. 将磁盘安装到受影响的虚拟机

sudo mkdir -p /demo-mount

  1. 进入挂载目录

sudo mount -o discard,defaults /dev/sdb /demo-mount

  1. 安装新包

sudo dpkg -i netplan.io_0.102-0ubuntu1~20.04.1_amd64.deb

  1. 停止虚拟机

  2. 移除磁盘

  3. 启动虚拟机

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