vmware虚拟机ubuntu20.04网络网卡检测失败，ifconfig的ip错误，且网络连接不了

sstap

可以看出，我的第二网卡没有检测出来。

root@jitsi:/home/ubuntu/Desktop# ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 1000  (本地环回)RX packets 194  bytes 16018 (16.0 KB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 194  bytes 16018 (16.0 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

发现重点线索一：systemd-resolved.service被屏蔽

root@jitsi:/home/ubuntu/Desktop# sudo /sbin/dhclient
Failed to reload-or-try-restart systemd-resolved.service: Unit systemd-resolved.service is masked.

通过查看，/lib/systemd/system/systemd-resolved.service文件存在

root@jitsi:/lib/systemd/system# cat systemd-resolved.service
#  SPDX-License-Identifier: LGPL-2.1+
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.[Unit]
Description=Network Name Resolution
Documentation=man:systemd-resolved.service(8)
Documentation=https://www.freedesktop.org/wiki/Software/systemd/resolved
Documentation=https://www.freedesktop.org/wiki/Software/systemd/writing-network-configuration-managers
Documentation=https://www.freedesktop.org/wiki/Software/systemd/writing-resolver-clients
DefaultDependencies=no
After=systemd-sysusers.service systemd-networkd.service
Before=network.target nss-lookup.target shutdown.target
Conflicts=shutdown.target
Wants=nss-lookup.target[Service]
AmbientCapabilities=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
CapabilityBoundingSet=CAP_SETPCAP CAP_NET_RAW CAP_NET_BIND_SERVICE
ExecStart=!!/lib/systemd/systemd-resolved
LockPersonality=yes
MemoryDenyWriteExecute=yes
NoNewPrivileges=yes
PrivateDevices=yes
PrivateTmp=yes
ProtectControlGroups=yes
ProtectHome=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
ProtectKernelLogs=yes
ProtectSystem=strict
Restart=always
RestartSec=0
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
RestrictNamespaces=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
RuntimeDirectory=systemd/resolve
RuntimeDirectoryPreserve=yes
SystemCallArchitectures=native
SystemCallErrorNumber=EPERM
SystemCallFilter=@system-service
Type=notify
User=systemd-resolve
WatchdogSec=3min[Install]
WantedBy=multi-user.target
Alias=dbus-org.freedesktop.resolve1.service

查看 systemd-resolved.service服务状态，确认systemd-resolved.service被屏蔽。

root@jitsi:/lib/systemd/system# systemctl status systemd-resolved.service
● systemd-resolved.serviceLoaded: masked (Reason: Unit systemd-resolved.service is masked.)Active: inactive (dead)
root@jitsi:/lib/systemd/system# systemctl restart systemd-resolved.service
Failed to restart systemd-resolved.service: Unit systemd-resolved.service is masked.

解除屏蔽，并重新启动systemd-resolved.service服务。

root@jitsi:/lib/systemd/system# systemctl unmask systemd-resolved
Removed /etc/systemd/system/systemd-resolved.service.
root@jitsi:/lib/systemd/system# systemctl restart systemd-resolved.service
root@jitsi:/lib/systemd/system# systemctl status systemd-resolved.service
● systemd-resolved.service - Network Name ResolutionLoaded: loaded (/lib/systemd/system/systemd-resolved.service; disabled; ve>Active: active (running) since Mon 2021-04-12 16:55:51 CST; 3s agoDocs: man:systemd-resolved.service(8)https://www.freedesktop.org/wiki/Software/systemd/resolvedhttps://www.freedesktop.org/wiki/Software/systemd/writing-network->https://www.freedesktop.org/wiki/Software/systemd/writing-resolver>Main PID: 2282 (systemd-resolve)Status: "Processing requests..."Tasks: 1 (limit: 4618)Memory: 4.8MCGroup: /system.slice/systemd-resolved.service└─2282 /lib/systemd/systemd-resolvedApr 12 16:55:50 jitsi.example.com systemd[1]: Starting Network Name Resolution...
Apr 12 16:55:51 jitsi.example.com systemd-resolved[2282]: Positive Trust Anchors:
Apr 12 16:55:51 jitsi.example.com systemd-resolved[2282]: . IN DS 20326 8 2 e06d44b80b8f1d39a95c0b0d7c65d08458e880409bbc683457104237c7f8ec8d
Apr 12 16:55:51 jitsi.example.com systemd-resolved[2282]: Negative trust anchors: 10.in-addr.arpa 16.172.in-addr.arpa 17.172.in-addr.arpa 18.172.in-a>
Apr 12 16:55:51 jitsi.example.com systemd-resolved[2282]: Using system hostname 'jitsi.example.com'.
Apr 12 16:55:51 jitsi.example.com systemd-resolved[2282]: Another process is already listening on TCP socket 127.0.0.53:53.
Apr 12 16:55:51 jitsi.example.com systemd-resolved[2282]: Turning off local DNS stub support.
Apr 12 16:55:51 jitsi.example.com systemd[1]: Started Network Name Resolution.

此时，网络可以正常访问了。但是与我想要的静态ip地址192.168.107.3地址不符。

root@jitsi:/lib/systemd/system# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.107.130  netmask 255.255.255.0  broadcast 192.168.107.255inet6 fe80::20c:29ff:fe6e:c31b  prefixlen 64  scopeid 0x20<link>ether 00:0c:29:6e:c3:1b  txqueuelen 1000  (以太网)RX packets 315  bytes 22287 (22.2 KB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 484  bytes 32877 (32.8 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 1000  (本地环回)RX packets 467  bytes 40027 (40.0 KB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 467  bytes 40027 (40.0 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

查看/etc/netplan/下的网卡配置文件

root@jitsi:/etc/netplan# cat 01-network-manager-all.yaml
# Let NetworkManager manage all devices on this system
network:version: 2renderer: NetworkManagerethernets:ens33:dhcp4: noaddresses: [192.168.107.3/24]gateway4: 192.168.107.1nameservers:addresses: [114.114.114.114,8.8.8.8]

使网卡配置文件立刻生效，此时，网络又连接不上了。

root@jitsi:/etc/netplan# sudo netplan apply
root@jitsi:/etc/netplan# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500ether 00:0c:29:6e:c3:1b  txqueuelen 1000  (以太网)RX packets 2939  bytes 2419000 (2.4 MB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 2654  bytes 306315 (306.3 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 1000  (本地环回)RX packets 671  bytes 57931 (57.9 KB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 671  bytes 57931 (57.9 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

dhclient命令可以使用网络接口名称作为参数，通过DHCP方式为指定的网络接口申请新的IP地址等参数。当不指定任何参数时，dhclient命令将会尝试为回环接口（lo）以外的所有网络接口申请新的IP地址。通过执行sudo /sbin/dhclient，网络重新得以连接，但仍不是我要的静态ip192.168.107.3

root@jitsi:/etc/netplan# sudo /sbin/dhclient
root@jitsi:/etc/netplan# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.107.130  netmask 255.255.255.0  broadcast 192.168.107.255ether 00:0c:29:6e:c3:1b  txqueuelen 1000  (以太网)RX packets 3000  bytes 2428932 (2.4 MB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 2715  bytes 313529 (313.5 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 1000  (本地环回)RX packets 674  bytes 58195 (58.1 KB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 674  bytes 58195 (58.1 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

对/etc/netplan的网卡配置文件作出修改

root@jitsi:/etc/netplan# cat 01-network-manager-all.yaml
# Let NetworkManager manage all devices on this system
network:version: 2ethernets:ens33:dhcp4: nooptional: trueaddresses: [192.168.107.3/24]gateway4: 192.168.107.1nameservers:addresses: [114.114.114.114,8.8.8.8]

去掉了

renderer: NetworkManager

使网卡配置文件立刻生效，此时，网络静态地址配置成功并可正常访问网站。

root@jitsi:/etc/netplan# sudo netplan apply
root@jitsi:/etc/netplan# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500inet 192.168.107.3  netmask 255.255.255.0  broadcast 192.168.107.255ether 00:0c:29:6e:c3:1b  txqueuelen 1000  (以太网)RX packets 3960  bytes 2780231 (2.7 MB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 3864  bytes 443472 (443.4 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536inet 127.0.0.1  netmask 255.0.0.0inet6 ::1  prefixlen 128  scopeid 0x10<host>loop  txqueuelen 1000  (本地环回)RX packets 948  bytes 96365 (96.3 KB)RX errors 0  dropped 0  overruns 0  frame 0TX packets 948  bytes 96365 (96.3 KB)TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

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