Troubleshooting CentOS 7 Boot Network device not booting method

In the VMware 10 installed a CentOS 7 system, boot found no network, so Ifconfig found that the network card did not start

Eno16777736:flags=4163<up,broadcast,running,multicast> MTU 1500

Ether 00:0c:29:2b:c0:1e Txqueuelen (Ethernet)

RX Packets 1 Bytes 251 (251.0 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

Lo:flags=73<up,loopback,running> MTU 65536

inet 127.0.0.1 netmask 255.0.0.0

Inet6:: 1 prefixlen ScopeID 0x10

Loop Txqueuelen 0 (Local Loopback)

RX Packets 386 bytes 33512 (32.7 KiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX Packets 386 bytes 33512 (32.7 KiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

A habitual restart of the network card Services "service network restart"

Tips:

Restarting network (via Systemctl): [OK]

Restart OK,,,,

Check the NIC "Ifconfig" again

It's the same old way.

So "Ifup eno16777736" manually restart the NIC

Tips:

Connection successfully activated (D-bus active path:/org/freedesktop/networkmanager/activeconnection/0)

Startup success

Check the NIC status "Ifconfig" again

Eno16777736:flags=4163<up,broadcast,running,multicast> MTU 1500

inet 192.168.41.128 netmask 255.255.255.0 broadcast 192.168.41.255

Inet6 fe80::20c:29ff:fe2b:c01e Prefixlen ScopeID 0x20<link>

Ether 00:0c:29:2b:c0:1e Txqueuelen (Ethernet)

RX Packets Bytes 9637 (9.4 KiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX Packets bytes 7083 (6.9 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 ScopeID 0x10

Loop Txqueuelen 0 (Local Loopback)

RX Packets 650 Bytes 56612 (55.2 KiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX Packets 650 Bytes 56612 (55.2 KiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

OK, get the IP problem resolved,

Subsequent:

Originally this problem will not appear, mainly my network environment is a DHCP server, IP address can be automatically obtained. If it is the manual input IP will not appear this problem, because in the network card configuration file There is a "onboot=no" indicates that the network card is not activated , because the CENTOS7 is not familiar with, so did not find this problem.

The above solution is not exhaustive, because every restart of the server will need to enter "Ifup eno16777736", it is troublesome, we can modify the network card configuration file "/etc/sysconfig/network-scripts/ ifcfg-eno16777736"Inside of the"onboot=no"modified to"Onboot=yes", so that the problem completely solved!

Troubleshooting CentOS 7 Boot Network device not booting method