解决CentOS7网卡连不上网且重启报错

2022-10-20 00:54| 来源: 网络整理| 查看: 265

VMWare虚拟机安装了CentOS7 ，突然发现连接不上，进入系统使用ifconfig命令查看网络设备，发现无外网网卡。

[root@localhost ~]# 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 (Local Loopback) RX packets 12 bytes 1068 (1.0 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 12 bytes 1068 (1.0 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr0: flags=4099 mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether 52:54:00:f6:af:41 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

那重启网卡试试看吧，what? 报错了！

[root@localhost ~]# systemctl status network ● network.service - LSB: Bring up/down networking Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled) Active: failed (Result: exit-code) since Mon 2020-09-28 09:59:00 CST; 9s ago Docs: man:systemd-sysv-generator(8) Process: 13344 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE) Sep 28 09:59:00 localhost.localdomain network[13344]: RTNETLINK answers: File... Sep 28 09:59:00 localhost.localdomain network[13344]: RTNETLINK answers: File... Sep 28 09:59:00 localhost.localdomain network[13344]: RTNETLINK answers: File... Sep 28 09:59:00 localhost.localdomain network[13344]: RTNETLINK answers: File... Sep 28 09:59:00 localhost.localdomain network[13344]: RTNETLINK answers: File... Sep 28 09:59:00 localhost.localdomain network[13344]: RTNETLINK answers: File... Sep 28 09:59:00 localhost.localdomain systemd[1]: network.service: control pr... Sep 28 09:59:00 localhost.localdomain systemd[1]: Failed to start LSB: Bring ... Sep 28 09:59:00 localhost.localdomain systemd[1]: Unit network.service entere... Sep 28 09:59:00 localhost.localdomain systemd[1]: network.service failed. Hint: Some lines were ellipsized, use -l to show in full.

出现此现象的原因一般是系统的 NetworkManager 管理套件出现了问题

Sep 28 09:59:00 localhost.localdomain systemd[1]: Failed to start LSB: Bring ...

所以我们要停止这个套件的服务

[root@localhost ~]# systemctl stop NetworkManager

然后重启网卡试试

[root@localhost ~]# systemctl restart network.service

没有报错，是不是可以了呢？我们查看网络设备

[root@localhost ~]# ifconfig ens33: flags=4163 mtu 1500 inet 192.168.100.15 netmask 255.255.255.0 broadcast 192.168.100.255 inet6 fe80::20c:29ff:fe35:e8d7 prefixlen 64 scopeid 0x20 ether 00:0c:29:35:e8:d7 txqueuelen 1000 (Ethernet) RX packets 9 bytes 626 (626.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 32 bytes 4309 (4.2 KiB) 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 (Local Loopback) RX packets 12 bytes 1068 (1.0 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 12 bytes 1068 (1.0 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr0: flags=4099 mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether 52:54:00:f6:af:41 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

OK，出现外网网卡了，为了防止重启后 NetworkManager 再次开启，我们这是不让它开机启动

systemctl disable NetworkManager

over!

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