问题现象

Sep 24 13:54:48 localhost.localdomainNetworkManager[4451]: <info> [1600926888.0948] audit: op="connection-activate" uuid="5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03"name="eth0" result="fail" reason="No suitable devicefound for this connection."
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: Bringing up interface eth0: Error: Connection activation failed: No suitable device found for thisconnection.
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: [FAILED]
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainnetwork[4497]: RTNETLINK answers: File exists
Sep 24 13:54:48 localhost.localdomainsystemd[1]: network.service: control process exited, code=exited status=1
Sep 24 13:54:48 localhost.localdomainsystemd[1]: Failed to start LSB: Bring up/down networking.
-- Subject: Unit network.service has failed

网上的一些办法，比如停止NetworkManager，没有什么用。

解决办法

先确保ifcfg-eth0配置文件信息准备无误

vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
IPADDR=10.0.2.27
NETMASK=255.255.255.0
GATEWAY=10.0.2.2
DNS1=202.101.172.35
DNS2=202.101.172.47
HWADDR=08:00:27:f9:b5:a1

移除/etc/sysconfig/network-scripts 目录下的除了ifcfg-eth0和ifcfg-lo这两个之外的其他网卡配置，比如删除ifcfg-enp0s3

如果再次运行systemctl restart network依然报错Failed to start LSB: Bring up/down networking。则重启一下机器reboot即可（关键）。重启后，恢复正常，再次运行systemctl restart network也没有报错了。

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