How to fix issue of systemctl restart network failed due to - Failed to start LSB: Bring up down network - error

Make sure there are no redundant ifcfg-* scripts in /etc/sysconfig/network-scripts/ directory

Error

[root@rhel7client1 ~]# systemctl restart network Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.

[root@rhel7client1 ~]# systemctl status network.service ● 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 Tue 2020-06-16 21:51:10 +08; 36s ago Docs: man:systemd-sysv-generator(8) Process: 3334 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE) Jun 16 21:51:10 rhel7client1 network[3334]: RTNETLINK answers: File exists Jun 16 21:51:10 rhel7client1 network[3334]: RTNETLINK answers: File exists Jun 16 21:51:10 rhel7client1 network[3334]: RTNETLINK answers: File exists Jun 16 21:51:10 rhel7client1 network[3334]: RTNETLINK answers: File exists Jun 16 21:51:10 rhel7client1 network[3334]: RTNETLINK answers: File exists Jun 16 21:51:10 rhel7client1 network[3334]: RTNETLINK answers: File exists Jun 16 21:51:10 rhel7client1 systemd[1]: network.service: control process exited, code=exited status=1 Jun 16 21:51:10 rhel7client1 systemd[1]: Failed to start LSB: Bring up/down networking. Jun 16 21:51:10 rhel7client1 systemd[1]: Unit network.service entered failed state. Jun 16 21:51:10 rhel7client1 systemd[1]: network.service failed.

Check #1

[root@rhel7client1 network-scripts]# cd /etc/sysconfig/network-scripts

[root@rhel7client1 network-scripts]# ls -ld ifcfg-*

-rw-r--r--. 1 root root 289 Jun 16 20:31 ifcfg-enp0s3 -rw-r--r--. 1 root root 254 Aug 19 2019 ifcfg-lo -rw-r--r--. 1 root root 322 Jun 16 20:27 ifcfg-Wired_connection_1 -rw-r--r--. 1 root root 292 Jun 16 20:31 ifcfg-Wired_connection_1-1 [root@rhel7client1 network-scripts]# grep HWADDR ifcfg-Wired* ifcfg-Wired_connection_1:HWADDR=08:00:27:60:57:5B ifcfg-Wired_connection_1-1:HWADDR=08:00:27:94:21:02

remove the invalid ifcfg-* script

[root@rhel7client1 network-scripts]# rm ifcfg-Wired_connection_1

Check #2

Make sure interfaces configured for automatic IP address have DHCP to assign IP, else change to manual before activating

e.g.

root@rhel7client1 ~]# nmcli con up enp0s8 Error: Connection activation failed: IP configuration could not be reserved (no available address, timeout, etc.)

[root@rhel7client1 ~]# nmcli con mod enp0s8 ipv4.addresses "192.168.0.20/24" [root@rhel7client1 ~]# nmcli con mod enp0s8 ipv4.method manual [root@rhel7client1 ~]# nmcli con up enp0s8 Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/11)