☰

将主机从 Ubuntu 18.04 升级到 20.04 后，Libvirt VM 网络无法启动

tag-icon • tag-icon systemd libvirt ubuntu-20.04 dhclient
将主机从 Ubuntu 18.04 升级到 20.04 后，Libvirt VM 网络无法启动

我将服务器从 18.04 升级到 20.04。我使用 libvirt/kvm 托管多个虚拟机。升级后，部分虚拟机无法重新连接到网络。

有问题的两台虚拟机分别运行 Ubuntu 18.04 和 Centos 7，重启后都无法启动网络。在我运行“sudo dhclient”后，两台虚拟机都成功连接

$ ping 1.1.1.1
connect: Network is unreachable

$ sudo dhclient
cmp: EOF on /tmp/tmp.ej3Phm6q0A which is empty

$ ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
64 bytes from 1.1.1.1: icmp_seq=1 ttl=56 time=17.7 ms

Centos VM 上“systemctl status network”的输出：

$ sudo systemctl status network
● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Thu 2021-02-04 08:48:35 UTC; 31min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 2524 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)

Feb 04 08:48:35 centosvm network[2524]: RTNETLINK answers: File exists
Feb 04 08:48:35 centosvm network[2524]: RTNETLINK answers: File exists
Feb 04 08:48:35 centosvm network[2524]: RTNETLINK answers: File exists
Feb 04 08:48:35 centosvm network[2524]: RTNETLINK answers: File exists
Feb 04 08:48:35 centosvm network[2524]: RTNETLINK answers: File exists
Feb 04 08:48:35 centosvm network[2524]: RTNETLINK answers: File exists
Feb 04 08:48:35 centosvm systemd[1]: network.service: control process exited, code=exited status=1
Feb 04 08:48:35 centosvm systemd[1]: Failed to start LSB: Bring up/down networking.
Feb 04 08:48:35 centosvm systemd[1]: Unit network.service entered failed state.
Feb 04 08:48:35 centosvm systemd[1]: network.service failed.

在 Ubuntu 18.04 VM 上：

$ sudo systemctl status -l systemd-networkd
● systemd-networkd.service - Network Service
   Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled; vendor
   Active: active (running) since Tue 2021-02-02 11:23:50 UTC; 1 day 21h ago
     Docs: man:systemd-networkd.service(8)
 Main PID: 760 (systemd-network)
   Status: "Processing requests..."
    Tasks: 1 (limit: 4915)
   CGroup: /system.slice/systemd-networkd.service
           └─760 /lib/systemd/systemd-networkd

Feb 04 09:22:10 ******* systemd-networkd[760]: vethf3988ae: Lost carrier
Feb 04 09:22:10 ubuntuvm systemd-networkd[760]: vethf3988ae: Link DOWN
Feb 04 09:22:11 ubuntuvm systemd-networkd[760]: br-32f293377024: Lost carrier
Feb 04 09:23:10 ubuntuvm systemd-networkd[760]: vethf7837d1: Link UP
Feb 04 09:23:11 ubuntuvm systemd-networkd[760]: vethf7837d1: Gained carrier
Feb 04 09:23:11 ubuntuvm systemd-networkd[760]: br-32f293377024: Gained carrier
Feb 04 09:23:12 ubuntuvm systemd-networkd[760]: vethf7837d1: Gained IPv6LL
Feb 04 09:23:12 ubuntuvm systemd-networkd[760]: vethf7837d1: Lost carrier
Feb 04 09:23:12 ubuntuvm systemd-networkd[760]: vethf7837d1: Link DOWN
Feb 04 09:23:13 ubuntuvm systemd-networkd[760]: br-32f293377024: Lost carrier

在 Ubuntu 20.04 主机上：

$ brctl show
bridge name bridge id STP enabled interfaces
...snip...
br0 8000.0cc47a228130 no enp4s0f0
       vnet0
       vnet1
       vnet2
       vnet3
       vnet5
...snip...

两个虚拟机都设置了连接网桥 br0 的接口：

<interface type='bridge'>
  <mac address='52:**********:90'/>
  <source bridge='br0'/>
  <model type='virtio'/>
  <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>

为什么主机从 18.04 升级到 20.04 后我的虚拟机无法连接？我该如何解决这个问题？

相关内容