Job for network.service failed because the control process exited with error code. See “systemctl status network.service” and “journalctl -xe” for details.

1、 The xshell is down and the reconnection failed. First Ping to see if the network is connected. Second, restart the network service and find an error. Third, view the error information according to the prompt. Fourth, solutions. First, check whether the configuration file is wrong. Second, there may be a conflict with the network manager service. Just close the service directly

3. If the two methods 1 and 2 still fail, try to delete all the other irrelevant network card location files under/etc/sysconfig/network scripts to avoid unnecessary influence. 5. Verify the network

Standby for a while, found that xshell connection failed, found that network connection failed, and restart failed.

1、 The xshell is down and the reconnection failed. Ping first to see if the network is connected

[root@db01 ~]# ping www.google.com
ping: www.google.com: Unknown name or service

2、 Restart the network service and find an error

[root@db01 ~]# 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.

3、 Check the error information according to the prompt

[root@db01 ~]# 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 四 2021-06-03 05:23:42 CST; 23s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 8821 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)

6月 03 05:23:42 db01 network[8821]: RTNETLINK answers: File exists
6月 03 05:23:42 db01 network[8821]: RTNETLINK answers: File exists
6月 03 05:23:42 db01 network[8821]: RTNETLINK answers: File exists
6月 03 05:23:42 db01 network[8821]: RTNETLINK answers: File exists
6月 03 05:23:42 db01 network[8821]: RTNETLINK answers: File exists
6月 03 05:23:42 db01 network[8821]: RTNETLINK answers: File exists
6月 03 05:23:42 db01 systemd[1]: network.service: control process exited, code=e...s=1
6月 03 05:23:42 db01 systemd[1]: Failed to start LSB: Bring up/down networking.
6月 03 05:23:42 db01 systemd[1]: Unit network.service entered failed state.
6月 03 05:23:42 db01 systemd[1]: network.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

4、 Solutions

1. Check whether the configuration file is wrong

[root@db01 ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
NAME=ens33
UUID=b5672928-cbbb-4428-a752-8bd9c14098e7
····
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.10.102
PREFIX=24
GATEWAY=192.168.10.2
DNS1=114.114.114.114
DNS2=8.8.8.8
DNS3=119.29.29.29
[root@db01 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:0c:29:3f:0f:29 brd ff:ff:ff:ff:ff:ff
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:3a:15:b7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000
    link/ether 52:54:00:3a:15:b7 brd ff:ff:ff:ff:ff:ff

2. There may be a conflict with the NetworkManager service. Just close the service directly

[root@db01 ~]# systemctl stop NetworkManager
[root@db01 ~]# systemctl restart network

3. If both methods 1 and 2 fail after verification, try to delete all other irrelevant network card location files under/etc/sysconfig/network scripts to avoid unnecessary influence

[root@db01 network-scripts]# ls
ifcfg-ens33      ifdown-ipv6      ifdown-tunnel  ifup-isdn    ifup-TeamPort
ifcfg-ens33.bak  ifdown-isdn      ifup           ifup-plip    ifup-tunnel
ifcfg-lo         ifdown-post      ifup-aliases   ifup-plusb   ifup-wireless
ifdown           ifdown-ppp       ifup-bnep      ifup-post    init.ipv6-global
ifdown-bnep      ifdown-routes    ifup-eth       ifup-ppp     network-functions
ifdown-eth       ifdown-sit       ifup-ib        ifup-routes  network-functions-ipv6
ifdown-ib        ifdown-Team      ifup-ippp      ifup-sit
ifdown-ippp      ifdown-TeamPort  ifup-ipv6      ifup-Team

5、 Verification Network

[root@db01 ~]# ping www.google.com
PING www.baidu.com (39.156.66.14) 56(84) bytes of data.
64 bytes from 39.156.66.14 (39.156.66.14): icmp_seq=1 ttl=128 time=55.8 ms
64 bytes from 39.156.66.14 (39.156.66.14): icmp_seq=2 ttl=128 time=42.8 ms
^C
--- www.baidu.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 42.825/49.312/55.800/6.491 ms
[root@db01 ~]#