Ubuntu focal 2 网络，两个默认网关 ==> 无连接

2024-6-10 • tag-icon

我正在使用 Ubuntu Focal 20

uname -a
Linux domaintf 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

带2个网络接口

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: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc fq_codel state UP group default qlen 1000
    link/ether fa:16:3e:f3:a6:ef brd ff:ff:ff:ff:ff:ff
    inet 10.20.10.226/24 brd 10.20.10.255 scope global dynamic ens3
       valid_lft 85607sec preferred_lft 85607sec
    inet6 fe80::f816:3eff:fef3:a6ef/64 scope link
       valid_lft forever preferred_lft forever
3: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc fq_codel state UP group default qlen 1000
    link/ether fa:16:3e:63:bc:b5 brd ff:ff:ff:ff:ff:ff
    inet 10.20.20.169/24 brd 10.20.20.255 scope global dynamic ens4
       valid_lft 85607sec preferred_lft 85607sec
    inet6 fe80::f816:3eff:fe63:bcb5/64 scope link
       valid_lft forever preferred_lft forever

默认的 netplan 内容如下

cat /etc/netplan/50-cloud-init.yaml
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    version: 2
    ethernets:
        ens3:
            dhcp4: true
            match:
                macaddress: fa:16:3e:f3:a6:ef
            mtu: 1450
            set-name: ens3
        ens4:
            dhcp4: true
            match:
                macaddress: fa:16:3e:63:bc:b5
            mtu: 1450
            set-name: ens4

默认情况下，我得到了两个具有相同度量的默认路由，这阻止我连接到可以由两者通告的地址

ip r
**default via 10.20.20.1 dev ens4 proto dhcp src 10.20.20.169 metric 100
default via 10.20.10.1 dev ens3 proto dhcp src 10.20.10.226 metric 100**
10.20.10.0/24 dev ens3 proto kernel scope link src 10.20.10.226
10.20.20.0/24 dev ens4 proto kernel scope link src 10.20.20.169
169.254.169.254 via 10.20.20.2 dev ens4 proto dhcp src 10.20.20.169 metric 100
169.254.169.254 via 10.20.10.1 dev ens3 proto dhcp src 10.20.10.226 metric 100

WA 就像修改 netplan 指标一样简单

udo cat /etc/netplan/50-cloud-init.yaml
sudo netpl# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    version: 2
    ethernets:
        ens3:
            dhcp4: true
            **dhcp4-overrides:
                route-metric: 100**
            match:
                macaddress: fa:16:3e:f3:a6:ef
            mtu: 1450
            set-name: ens3
        ens4:
            dhcp4: true
            **dhcp4-overrides:**
                **route-metric: 300**
            match:
                macaddress: fa:16:3e:63:bc:b5
            mtu: 1450
            set-name: ens4
ip r
default via 10.20.10.1 dev ens3 proto dhcp src 10.20.10.226 metric 100
**default via 10.20.20.1 dev ens4 proto dhcp src 10.20.20.169 metric 300**
10.20.10.0/24 dev ens3 proto kernel scope link src 10.20.10.226
10.20.20.0/24 dev ens4 proto kernel scope link src 10.20.20.169
169.254.169.254 via 10.20.10.1 dev ens3 proto dhcp src 10.20.10.226 metric 100
**169.254.169.254 via 10.20.20.2 dev ens4 proto dhcp src 10.20.20.169 metric 300**

最终，应该通过默认不允许两个具有相同度量的默认网关来修复该错误；那么作为临时的解决方法，我想请你帮助我如何通过 cloud init 进行配置

我尝试了以下配置，但没有效果

cat cloudinit2.txt
#cloud-config
password: password
chpasswd: { expire: False }
ssh_pwauth: True
write_files:
  - path: /etc/netplan/50-cloud-init.yaml
    permissions: '0644'
    content: |
        network:
            version: 2
            ethernets:
                ens3:
                    dhcp4: true
                    dhcp4-overrides:
                        route-metric: 100
                     mtu: 1450
                     set-name: ens3
                ens4:
                    dhcp4: true
                    dhcp4-overrides:
                        route-metric: 200
                     mtu: 1450
                     set-name: ens4
runcmd:
 - sudo netplan apply

答案1

非常感谢 Lukas，我按照你的建议完成了配置

 cat netcloud
#cloud-config
password: password
chpasswd: { expire: False }
ssh_pwauth: True
write_files:
  - path: /etc/netplan/90-custom-config.yaml
    permissions: '0644'
    content: |
        network:
            version: 2
            ethernets:
                ens3:
                    dhcp4: true
                    dhcp4-overrides:
                        route-metric: 100
                    mtu: 1450
                    set-name: ens3
                ens4:
                    dhcp4: true
                    dhcp4-overrides:
                        route-metric: 200
                    mtu: 1450
                    set-name: ens4
runcmd:
 - sudo netplan apply

答案1

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