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Centos7 cannot access the Internet, what should I do if I restart the network card and report an error?
Centos7 cannot access the Internet, what should I do if I restart the network card and report an error?
Problem:
CentOS7 was installed on the VMWare virtual machine, but suddenly it was found that it could not connect. I entered the system and used the ifconfig command to check the network devices and found that there was no external network card.
(Recommended tutorial: centos tutorial)
is as follows:
[root@localhost ~]# ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
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<UP,BROADCAST,MULTICAST> 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 0Try restarting the network card. The result was an error! The error message is as follows:
[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.The reason for this phenomenon is generally that there is a problem with the system's NetworkManager management suite
Sep 28 09:59:00 localhost.localdomain systemd[1]: Failed to start LSB: Bring ...
So we need to stop the service of this suite
[root@localhost ~]# systemctl stop NetworkManager
and then restart it Try the network card
[root@localhost ~]# systemctl restart network.service
and no error is reported. Is it ok? We check that the network device
[root@localhost ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> 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<link>
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<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
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<UP,BROADCAST,MULTICAST> 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 0has an external network card. In order to prevent NetworkManager from starting again after restarting, we do not allow it to boot up
systemctl disable NetworkManager
Complete!
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