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 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (本地环回)
RX packets 194 bytes 16018 (16.0 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX 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.service
Loaded: 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 Resolution
Loaded: loaded (/lib/systemd/system/systemd-resolved.service; disabled; ve>
Active: active (running) since Mon 2021-04-12 16:55:51 CST; 3s ago
Docs: man:systemd-resolved.service(8)
https://www.freedesktop.org/wiki/Software/systemd/resolved
https://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: 4.8M
CGroup: /system.slice/systemd-resolved.service
└─2282 /lib/systemd/systemd-resolved
Apr 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 mtu 1500
inet 192.168.107.130 netmask 255.255.255.0 broadcast 192.168.107.255
inet6 fe80::20c:29ff:fe6e:c31b prefixlen 64 scopeid 0x20
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 0
TX packets 484 bytes 32877 (32.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (本地环回)
RX packets 467 bytes 40027 (40.0 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX 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: 2
renderer: NetworkManager
ethernets:
ens33:
dhcp4: no
addresses: [192.168.107.3/24]
gateway4: 192.168.107.1
nameservers:
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 mtu 1500
ether 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 0
TX packets 2654 bytes 306315 (306.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (本地环回)
RX packets 671 bytes 57931 (57.9 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX 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 mtu 1500
inet 192.168.107.130 netmask 255.255.255.0 broadcast 192.168.107.255
ether 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 0
TX packets 2715 bytes 313529 (313.5 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (本地环回)
RX packets 674 bytes 58195 (58.1 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX 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: 2
ethernets:
ens33:
dhcp4: no
optional: true
addresses: [192.168.107.3/24]
gateway4: 192.168.107.1
nameservers:
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 mtu 1500
inet 192.168.107.3 netmask 255.255.255.0 broadcast 192.168.107.255
ether 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 0
TX packets 3864 bytes 443472 (443.4 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (本地环回)
RX packets 948 bytes 96365 (96.3 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 948 bytes 96365 (96.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
