1.查看
[root@centos7 network-scripts]# 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 三 2021-02-24 17:25:25 CST; 34min ago
Docs: man:systemd-sysv-generator(8)
Process: 9525 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
2月 24 17:25:25 153-37-216-21 network[9525]: RTNETLINK answers: File exists
2月 24 17:25:25 153-37-216-21 network[9525]: RTNETLINK answers: File exists
2月 24 17:25:25 153-37-216-21 network[9525]: RTNETLINK answers: File exists
2月 24 17:25:25 153-37-216-21 network[9525]: RTNETLINK answers: File exists
2月 24 17:25:25 153-37-216-21 network[9525]: RTNETLINK answers: File exists
2月 24 17:25:25 153-37-216-21 network[9525]: RTNETLINK answers: File exists
2月 24 17:25:25 153-37-216-21 systemd[1]: network.service: control process exited, code=exited status=1
2月 24 17:25:25 153-37-216-21 systemd[1]: Failed to start LSB: Bring up/down networking.
2月 24 17:25:25 153-37-216-21 systemd[1]: Unit network.service entered failed state.
2月 24 17:25:25 153-37-216-21 systemd[1]: network.service failed.
2.问题排查
# 1.如果是启动的network的话，可以是下面多个网卡配置文件，启动的话会顺序检查，可以将用不到的ifcfg-eth*删掉
[root@centos7 network-scripts]# ll
总用量 248
-rw-r--r--. 1 root root 62 3月 13 2019 ifcfg-eth0
-rw-r--r-- 1 root root 62 2月 24 16:47 ifcfg-eth1
-rw-r--r--. 1 root root 62 3月 13 2019 ifcfg-eth2
-rw-r--r--. 1 root root 62 3月 13 2019 ifcfg-eth3
# 2.可以停用network启用NetworkManager
[root@153-37-216-21 network-scripts]# systemctl status NetworkManager
● NetworkManager.service - Network Manager
Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; disabled; vendor preset: enabled)
Active: active (running) since 三 2021-02-24 17:26:15 CST; 35min ago
Docs: man:NetworkManager(8)
Main PID: 9781 (NetworkManager)
CGroup: /system.slice/NetworkManager.service
├─9781 /usr/sbin/NetworkManager --no-daemon
├─9788 /sbin/dhclient -d -q -sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-eth0.pid -lf /var/lib/NetworkManager/dhclient-5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03-eth0.leas...
└─9790 /sbin/dhclient -d -q -sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-eth1.pid -lf /var/lib/NetworkManager/dhclient-9c92fad9-6ecb-3e6c-eb4d-8a47c6f50c04-eth1.leas...
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5450] dhcp4 (eth1): address 192.168.103.102
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5450] dhcp4 (eth1): plen 24 (255.255.255.0)
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5451] dhcp4 (eth1): lease time 4294967295
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5451] dhcp4 (eth1): state changed unknown -> bound
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5464] device (eth1): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'assume')
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5473] device (eth1): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'assume')
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5476] device (eth1): state change: secondaries -> activated (reason 'none', sys-iface-state: 'assume')
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5505] device (eth1): Activation: successful, device activated.
2月 24 17:26:15 153-37-216-21 NetworkManager[9781]: <info> [1614158775.5509] manager: startup complete
2月 24 17:26:15 153-37-216-21 dhclient[9790]: bound to 192.168.103.102 -- renewal in 2147483648 seconds.
注:两者有时会冲突