我正在尝试为我们的 CloudStack 测试设置一个主机，但是在使用 Netplan 配置网络桥接时我无法找出问题所在。
来自安装文档，他们展示了一个使用的示例/etc/network/interfaces。Ubuntu 20 改用 Netplan。目标是拥有如下配置：
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet manual
auto eth0.200
iface eth0 inet manual
# management network
auto cloudbr0
iface cloudbr0 inet static
bridge_ports eth0
bridge_fd 0
bridge_stp off
bridge_maxwait 1
address 192.168.42.11
netmask 255.255.255.240
gateway 192.168.42.1
dns-nameservers 8.8.8.8 8.8.4.4
dns-domain lab.example.org
# guest network
auto cloudbr1
iface cloudbr1 inet manual
bridge_ports eth0.200
bridge_fd 0
bridge_stp off
bridge_maxwait 1
输出ifconfig为：
ifconfig
eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet XX.XX.XXX.XXX netmask 255.255.255.0 broadcast XX.XX.XXX.XXX
inet6 XXXX::XXXX:XXXX:XXXX:XXX prefixlen 64 scopeid 0x20<link>
inet6 XXXX::XXXX:XXXX:XXXX:: prefixlen 56 scopeid 0x0<global>
ether XX:XX:XX:XX:XX:XX txqueuelen 1000 (Ethernet)
RX packets 791 bytes 113330 (113.3 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 767 bytes 104793 (104.7 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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 20 bytes 2028 (2.0 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 20 bytes 2028 (2.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
此时，我明白在这种情况下我应该参考eno1而不是eth0。
默认配置没有问题，我可以 ping 服务器。它看起来像：
cat 50-cloud-init.yaml
network:
version: 2
ethernets:
eno1:
accept-ra: false
addresses:
- XXXX:XXXX:XXX:XXXX::/56
dhcp4: true
match:
macaddress: XX:XX:XX:XX:X:XX
nameservers:
addresses:
- XXXX:XXXX:X:XXX::X
routes:
- to: ::/0
via: XXXX:XXXX:XXXX:XXff:ff:ff:ff:ff
- ......
set-name: eno1
我已经修改了配置以包含他们在文档中建议的桥梁：
network:
version: 2
renderer: networkd
ethernets:
eno1:
accept-ra: false
dhcp4: false
optional: true
bridges:
cloudbr0:
interfaces: [eno1]
addresses:
- XX.XX.XXX.XXX/24
gateway4: XX.XX.XXX.XXX
nameservers:
addresses: [8.8.8.8, 8.8.4.4]
cloudbr1:
interfaces: [eno1.200]
然后我运行netplan --debug try测试它，得到以下结果：
netplan --debug try
DEBUG:eno1 not found in {}
DEBUG:cloudbr0 not found in {}
DEBUG:cloudbr1 not found in {'cloudbr0': {'interfaces': ['eno1'], 'addresses': ['XX.XX.XXX.XXX/24'], 'gateway4': 'XX.XX.XXX.XXX', 'nameservers': {'addresses': ['8.8.8.8', '8.8.4.4']}}}
DEBUG:Merged config:
network:
bridges:
cloudbr0:
addresses:
- XX.XX.XXX.XXX/24
gateway4: XX.XX.XXX.XXX
interfaces:
- eno1
nameservers:
addresses:
- 8.8.8.8
- 8.8.4.4
cloudbr1:
interfaces:
- eno1.200
ethernets:
eno1:
accept-ra: false
dhcp4: false
optional: true
renderer: networkd
version: 2
DEBUG:New interfaces: set()
** (generate:1793): DEBUG: 09:53:40.751: starting new processing pass
** (generate:1793): DEBUG: 09:53:40.751: recording missing yaml_node_t eno1.200
(generate:1793): GLib-GIO-DEBUG: 09:53:40.757: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ?gio-vfs?
/etc/netplan/50-cloud-init.yaml:22:20: Error in network definition: cloudbr1: interface 'eno1.200' is not defined
interfaces: [eno1.200]
^
An error occurred: the configuration could not be generated
现在，如果我改为，我[eno1.200]得到。[eno1]Error in network definition: cloudbr1: interface 'eno1' is already assigned to bridge cloudbr0
问：我的配置文件应该如何工作？