版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/lk142500/article/details/82778165
1 问题描述
在使用Centos7时，突然遇到使用systemctl status network发现网络无法正常重启。当时束手无策。虽然看到
状态显示为Failed to start LSB.但没有较好的解决方式。当时同事因为经验比较丰富，操作了一下，把操作记录
留存一下，以后在遇到相同问题时，可以快速解决.
2 操作
2.1 问题描述
[root@localhost Desktop]# 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 Tue 2018-09-18 23:00:03 PDT; 38s ago
Docs: man:systemd-sysv-generator(8)
Process: 1124 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
Sep 18 23:00:03 localhost.localdomain network[1124]: Could not load file '/et...
Sep 18 23:00:03 localhost.localdomain network[1124]: Could not load file '/et...
Sep 18 23:00:03 localhost.localdomain network[1124]: Could not load file '/et...
Sep 18 23:00:03 localhost.localdomain network[1124]: [ OK ]
Sep 18 23:00:03 localhost.localdomain network[1124]: Bringing up interface en...
Sep 18 23:00:03 localhost.localdomain network[1124]: [FAILED]
Sep 18 23:00:03 localhost.localdomain systemd[1]: network.service: control pr...
Sep 18 23:00:03 localhost.localdomain systemd[1]: Failed to start LSB: Bring ...
Sep 18 23:00:03 localhost.localdomain systemd[1]: Unit network.service entere...
Sep 18 23:00:03 localhost.localdomain systemd[1]: network.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
2.2 解决方式如下
2.2.1 删除网卡UUID
首先删去网卡UUID
[root@localhost Desktop]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# vim ifcfg-eno16777736
[root@localhost network-scripts]# cat ifcfg-eno16777736
TYPE=Ethernet
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777736
DEVICE=eno16777736
ONBOOT=yes
PEERDNS=yes
PEERROUTES=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPADDR=192.168.0.125
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
DNS=8.8.8.8
尝试重启网络服务
[root@localhost network-scripts]# 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@localhost network-scripts]# 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.
2.2.2 ifconfig命令
使用ifconfig查询所有网卡的状态和信息。发现仍然没有配置的192.168.0.125网卡信息。
[root@localhost network-scripts]# ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 192 bytes 16704 (16.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 192 bytes 16704 (16.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:aa:ec:2a txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 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
[root@localhost network-scripts]# ifdown ifcfg-eno16777736
2.2.3 ifup启动网卡
使用ifup命令加上网卡配置尝试启动网卡
[root@localhost network-scripts]# ifup ifcfg-eno16777736
Error: Connection activation failed: No suitable device found for this connection.
[root@localhost network-scripts]# ifconfig -a
eno16777736: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether 00:0c:29:49:b7:e5 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 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 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 192 bytes 16704 (16.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 192 bytes 16704 (16.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:aa:ec:2a txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 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
virbr0-nic: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether 52:54:00:aa:ec:2a txqueuelen 500 (Ethernet)
RX packets 0 bytes 0 (0.0 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
2.2.4 停止NetworkManager.service
停止网络管理服务
[root@localhost Desktop]# systemctl stop NetworkManager.service
[root@localhost Desktop]# systemctl disable NetworkManager.service
Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.
2.2.5 重启network服务
[root@localhost network-scripts]# service network restart
Restarting network (via systemctl): [ OK ]
[root@localhost network-scripts]#
[root@localhost network-scripts]#
[root@localhost network-scripts]#
2.3 问题解决
[root@localhost network-scripts]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.125 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::20c:29ff:fe49:b7e5 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:49:b7:e5 txqueuelen 1000 (Ethernet)
RX packets 5 bytes 582 (582.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 19 bytes 2913 (2.8 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 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 260 bytes 22616 (22.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 260 bytes 22616 (22.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:aa:ec:2a txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 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
2.4 新的问题 无法ping通百度
[root@localhost network-scripts]# ping www.baidu.com
ping: unknown host www.baidu.com
[root@localhost network-scripts]#
2.5 使用命令dhclient解决
[root@localhost network-scripts]# dhclient
[root@localhost network-scripts]# ping www.baidu.com
PING www.a.shifen.com (115.239.211.112) 56(84) bytes of data.
64 bytes from 115.239.211.112: icmp_seq=1 ttl=53 time=11.4 ms
64 bytes from 115.239.211.112: icmp_seq=2 ttl=53 time=8.78 ms
^C
--- www.a.shifen.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 8.789/10.117/11.446/1.332 ms
[root@localhost network-scripts]#
[root@localhost network-scripts]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.125 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::20c:29ff:fe49:b7e5 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:49:b7:e5 txqueuelen 1000 (Ethernet)
RX packets 46 bytes 5476 (5.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 36 bytes 5680 (5.5 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 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 268 bytes 23248 (22.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 268 bytes 23248 (22.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:aa:ec:2a txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 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
virbr0-nic: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 52:54:00:aa:ec:2a txqueuelen 500 (Ethernet)
RX packets 0 bytes 0 (0.0 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
2.5 修改DNS域名解析服务
上述的2.5是错误，这是因为配置文件的本意是要使用static ip，就是固定ip，但如果使用命令dhclient,则默认启动了一个DHCP服务，这样会动态修改IP，因此在本意情况下应该停止该服务。
2.5.1 杀死dhclient进程
[root@localhost network-scripts]# ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 Sep27 ? 00:00:04 /usr/lib/systemd/systemd --swi
root 2 0 0 Sep27 ? 00:00:00 [kthreadd]
root 3 2 0 Sep27 ? 00:00:00 [ksoftirqd/0]
root 7 2 0 Sep27 ? 00:00:00 [migration/0]
root 8 2 0 Sep27 ? 00:00:00 [rcu_bh]
root 9 2 0 Sep27 ? 00:00:00 [rcuob/0]
root 10 2 0 Sep27 ? 00:00:00 [rcuob/1]
root 11 2 0 Sep27 ? 00:00:00 [rcuob/2]
[root@localhost network-scripts]# ps -ef | grep dh
nobody 2639 1 0 Sep27 ? 00:00:00 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
root 2640 2639 0 Sep27 ? 00:00:00 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
root 4500 1 0 Sep27 ? 00:00:00 dhclient
root 59112 58502 0 02:41 pts/0 00:00:00 grep --color=auto dh
[root@localhost network-scripts]# kill -9 4500
[root@localhost network-scripts]#
[root@localhost network-scripts]#
[root@localhost network-scripts]#
[root@localhost network-scripts]# ps -ef | grep dh
nobody 2639 1 0 Sep27 ? 00:00:00 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
root 2640 2639 0 Sep27 ? 00:00:00 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/libexec/libvirt_leaseshelper
root 59129 58502 0 02:41 pts/0 00:00:00 grep --color=auto dh
2.5.2 重启网络
[root@localhost network-scripts]# service network restart
Restarting network (via systemctl): [ OK ]
[root@localhost network-scripts]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet **192.168.0.125** netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::20c:29ff:fe49:b7e5 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:49:b7:e5 txqueuelen 1000 (Ethernet)
RX packets 284767 bytes 20513194 (19.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 357297 bytes 969250205 (924.3 MiB)
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 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 22 bytes 2130 (2.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 22 bytes 2130 (2.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:aa:ec:2a txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 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
virbr0-nic: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 52:54:00:aa:ec:2a txqueuelen 500 (Ethernet)
RX packets 0 bytes 0 (0.0 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
2.5.3 ping不通百度
[root@localhost network-scripts]# ping www.baidu.com
ping: unknown host www.baidu.com
2.5.4 解决方式
-
使用vim命令修改配置文件ifcfg-eno16777736，删除其中DNS信息。
-
修改配置文件/etc/resolv.conf
[root@localhost cetc52]# cat /etc/resolv.conf
; generated by /usr/sbin/dhclient-script
nameserver 192.168.0.1
/etc/resolv.conf配置文件中192.168.0.1为虚拟机所在主机的默认网关。添加nameserver为默认网关即可，同时如果仍然无法ping通百度，也可以再添加一项
namserver 8.8.8.8
2.5.5 验证
[root@localhost network-scripts]# ping www.baidu.com
PING www.a.shifen.com (58.217.200.15) 56(84) bytes of data.
64 bytes from 58.217.200.15: icmp_seq=1 ttl=52 time=481 ms
64 bytes from 58.217.200.15: icmp_seq=2 ttl=52 time=22.4 ms
64 bytes from 58.217.200.15: icmp_seq=3 ttl=52 time=22.0 ms
3. 问题总结
工作中第一次遇到问题，问题是问题没有什么的，但如果第二次遇到相同的问题，仍然是问题，这就是很大的问题了。多总结，多思考，多学习这才是正常的职场态度。加油