18.04 接连出现好几次断网的问题

[dangofans]

我用的版本是18.04.5 LTS，最近出现了几次无故断网的情况。由于没接显示器，也没法查看具体有什么问题，只能重启恢复。

系统版本：Ubuntu 18.04.5 LTS
网卡：Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller

代码： 全选

$ 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:
    ethernets:
        enp3s0:
            dhcp4: false
            addresses: [192.168.0.8/24]
            gateway4: 192.168.0.1
            nameservers:
                    addresses: [114.114.114.114,192.168.0.1]
            optional: false
    version: 2

10号早上重启是我操作的

代码： 全选

Jan 08 23:09:26 ubuntu systemd-networkd[934]: veth943647f: Gained carrier
Jan 08 23:09:26 ubuntu systemd-networkd[934]: veth9def294: Gained IPv6LL
Jan 08 23:09:26 ubuntu systemd-networkd[934]: veth2bdede5: Gained IPv6LL
Jan 08 23:09:26 ubuntu systemd-networkd[934]: veth4385ec7: Link UP
Jan 08 23:09:26 ubuntu systemd-networkd[934]: veth521cd67: Gained IPv6LL
Jan 08 23:09:27 ubuntu systemd-networkd[934]: vethdd84adf: Gained IPv6LL
Jan 08 23:09:27 ubuntu systemd-networkd[934]: veth29645eb: Gained carrier
Jan 08 23:09:27 ubuntu systemd-networkd[934]: veth943647f: Gained IPv6LL
Jan 08 23:09:28 ubuntu systemd-networkd[934]: vethc00e410: Gained carrier
Jan 08 23:09:28 ubuntu systemd-networkd[934]: veth802e3e8: Gained carrier
Jan 08 23:09:28 ubuntu systemd-networkd[934]: veth3a025d8: Gained carrier
Jan 08 23:09:28 ubuntu systemd-networkd[934]: veth2ab26d7: Gained carrier
Jan 08 23:09:28 ubuntu systemd-networkd[934]: vethd53ad09: Gained carrier
Jan 08 23:09:28 ubuntu systemd-networkd[934]: veth8ebf5ae: Gained carrier
Jan 08 23:09:28 ubuntu systemd-networkd[934]: veth4385ec7: Gained carrier
Jan 08 23:09:29 ubuntu systemd-networkd[934]: vethc00e410: Gained IPv6LL
Jan 08 23:09:29 ubuntu systemd-networkd[934]: veth29645eb: Gained IPv6LL
Jan 08 23:09:29 ubuntu systemd-networkd[934]: veth3a025d8: Gained IPv6LL
Jan 08 23:09:29 ubuntu systemd-networkd[934]: veth802e3e8: Gained IPv6LL
Jan 08 23:09:29 ubuntu systemd-networkd[934]: vethd53ad09: Gained IPv6LL
Jan 08 23:09:30 ubuntu systemd-networkd[934]: veth8ebf5ae: Gained IPv6LL
Jan 08 23:09:30 ubuntu systemd-networkd[934]: veth2ab26d7: Gained IPv6LL
Jan 08 23:09:30 ubuntu systemd-networkd[934]: veth4385ec7: Gained IPv6LL
Jan 08 23:46:05 ubuntu systemd-networkd[934]: virbr0-nic: Link UP
Jan 08 23:46:05 ubuntu systemd-networkd[934]: virbr0-nic: Gained carrier
Jan 08 23:46:05 ubuntu systemd-networkd[934]: virbr0: Link UP
Jan 08 23:46:05 ubuntu systemd-networkd[934]: virbr0-nic: Link DOWN
Jan 08 23:46:05 ubuntu systemd-networkd[934]: virbr0-nic: Lost carrier
Jan 08 23:46:18 ubuntu systemd-networkd[934]: vnet0: Link UP
Jan 08 23:46:18 ubuntu systemd-networkd[934]: vnet0: Gained carrier
Jan 08 23:46:19 ubuntu systemd-networkd[934]: vnet0: Gained IPv6LL
Jan 08 23:46:22 ubuntu systemd-networkd[934]: virbr0: Gained carrier
-- Reboot --
Jan 10 04:35:32 ubuntu systemd[1]: Starting Network Service...
Jan 10 04:35:33 ubuntu systemd-networkd[987]: Enumeration completed
Jan 10 04:35:33 ubuntu systemd-networkd[987]: wlp2s0: Interface name change detected, wlp2s0 has been renamed to wlan0.
Jan 10 04:35:33 ubuntu systemd[1]: Started Network Service.
Jan 10 04:35:33 ubuntu systemd-networkd[987]: wlan0: Interface name change detected, wlan0 has been renamed to wlp2s0.
Jan 10 04:35:33 ubuntu systemd-networkd[987]: enp3s0: IPv6 successfully enabled
Jan 10 04:35:33 ubuntu systemd-networkd[987]: wlp2s0: Link is not managed by us
Jan 10 04:35:33 ubuntu systemd-networkd[987]: lo: Link is not managed by us
Jan 10 04:35:33 ubuntu systemd-networkd[987]: enp3s0: Link UP
Jan 10 04:35:36 ubuntu systemd-networkd[987]: enp3s0: Gained carrier
Jan 10 04:35:37 ubuntu systemd-networkd[987]: enp3s0: Gained IPv6LL
Jan 10 04:35:37 ubuntu systemd-networkd[987]: enp3s0: Configured
Jan 10 04:35:43 ubuntu systemd-networkd[987]: br-0a36c48d97f1: Link UP
Jan 10 04:35:43 ubuntu systemd-networkd[987]: docker0: Link UP
Jan 10 04:35:43 ubuntu systemd-networkd[987]: br-81ed36bdd834: Link UP
Jan 10 04:35:55 ubuntu systemd-networkd[987]: veth07906b5: Link UP
Jan 10 04:35:55 ubuntu systemd-networkd[987]: vethf0a4dc3: Link UP
Jan 10 04:35:55 ubuntu systemd-networkd[987]: veth30c01c2: Link UP

需要其他的日志我可以提供，谢谢大家帮忙

[astolia]

到底是哪个网断？如果是enp3s0断了，不是还有个无线网wlp2s0吗？用它来登录系统看看？
光有systemd-networkd的日志没啥用，重启前其他部分的日志呢？
还有你确定是服务器上的网络故障而不是被arp攻击了之类的？