启动网卡报错(Failed to start LSB: Bring up/down networking )解决办法总结
Failed to start LSB: Bring up/down networking
遇到这个错误好几次,所以总结了一下排解的几种方法。
错误记录及排查方法过程:
当我克隆出一台新的centos7的虚拟机的时候,修改了网卡配置文件启动时,报错
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[root@centos7 ~]
# 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@centos7 ~]
#
|
按照提示输入systemctl status network.service查看
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[root@centos7 ~]
# 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 Mon 2017-03-13 23:24:37 CST; 16s ago
Docs:
man
:systemd-sysv-generator(8)
Process: 2878 ExecStart=
/etc/rc
.d
/init
.d
/network
start (code=exited, status=1
/FAILURE
)
Mar 13 23:24:37 centos7 network[2878]: RTNETLINK answers: File exists
Mar 13 23:24:37 centos7 network[2878]: RTNETLINK answers: File exists
Mar 13 23:24:37 centos7 network[2878]: RTNETLINK answers: File exists
Mar 13 23:24:37 centos7 network[2878]: RTNETLINK answers: File exists
Mar 13 23:24:37 centos7 network[2878]: RTNETLINK answers: File exists
Mar 13 23:24:37 centos7 network[2878]: RTNETLINK answers: File exists
Mar 13 23:24:37 centos7 systemd[1]: network.service: control process exited, code=exited status=1
Mar 13 23:24:37 centos7 systemd[1]: Failed to start LSB: Bring up
/down
networking.
Mar 13 23:24:37 centos7 systemd[1]: Unit network.service entered failed state.
Mar 13 23:24:37 centos7 systemd[1]: network.service failed.
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无奈去百度了一下,找到解决方法,说是centos7没有70-persistent-net.rules这个文件,所以新克隆的机器需要配置mac地址。
通过ip a命令查看mac地址是00:0c:29:0c:15:49
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2: eno16777736:
link
/ether
00:0c:29:0c:15:49 brd ff:ff:ff:ff:ff:ff
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然后在配置文件中加入这一行(如果存在的话只修改就可以)
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HWADDR=00:0c:29:0c:15:49
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重启生效
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[root@centos7 ~]
# systemctl restart network.service
Job
for
network.service failed because the control process exited with error code. See
"systemctl status network.service"
and
"journalctl -xe"
for
details.
[root@centos7 ~]
#
|
发现依然有这个错误
查看启动日志
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Mar 13 23:51:35 centos7 systemd: Starting LSB: Bring up
/down
networking...
Mar 13 23:51:35 centos7 network: Bringing up loopback interface: Could not load
file
'/etc/sysconfig/network-scripts/ifcfg-lo'
Mar 13 23:51:35 centos7 network: Could not load
file
'/etc/sysconfig/network-scripts/ifcfg-lo'
Mar 13 23:51:35 centos7 network: Could not load
file
'/etc/sysconfig/network-scripts/ifcfg-lo'
Mar 13 23:51:35 centos7 network: Could not load
file
'/etc/sysconfig/network-scripts/ifcfg-lo'
Mar 13 23:51:35 centos7 network: [ OK ]
Mar 13 23:51:36 centos7 network: Bringing up interface eth0: Error: Connection activation failed: No suitable device found
for
this connection.
Mar 13 23:51:36 centos7 network: [FAILED]
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 network: RTNETLINK answers: File exists
Mar 13 23:51:36 centos7 systemd: network.service: control process exited, code=exited status=1
Mar 13 23:51:36 centos7 systemd: Failed to start LSB: Bring up
/down
networking.
Mar 13 23:51:36 centos7 systemd: Unit network.service entered failed state.
Mar 13 23:51:36 centos7 systemd: network.service failed.
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发现无法加载/etc/sysconfig/network-scripts/ifcfg-lo文件
给NetworkManager-wait-online服务设置开机自启动
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systemctl
enable
NetworkManager-wait-online.service
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然后重启网卡
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[root@centos7 ~]
# 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@centos7 ~]
#
|
查看日志
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Could not load
file
'/etc/sysconfig/network-scripts/ifcfg-lo'
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这个错误依然存在
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systemctl stop NetworkManager
systemctl disable NetworkManager
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将 NetworkManager关闭,然后重启网卡,查看日志
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Mar 14 00:31:27 centos7 systemd: Starting LSB: Bring up
/down
networking...
Mar 14 00:31:27 centos7 network: Bringing up loopback interface: [ OK ]
Mar 14 00:31:28 centos7 network: Bringing up interface eth0: ERROR : [
/etc/sysconfig/network-scripts/ifup-eth
] Device eth0 does not seem to be present, delaying initialization.
Mar 14 00:31:28 centos7
/etc/sysconfig/network-scripts/ifup-eth
: Device eth0 does not seem to be present, delaying initialization.
Mar 14 00:31:28 centos7 network: [FAILED]
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 network: RTNETLINK answers: File exists
Mar 14 00:31:28 centos7 systemd: network.service: control process exited, code=exited status=1
Mar 14 00:31:28 centos7 systemd: Failed to start LSB: Bring up
/down
networking.
Mar 14 00:31:28 centos7 systemd: Unit network.service entered failed state.
Mar 14 00:31:28 centos7 systemd: network.service failed.
Mar 14 00:33:42 centos7 dhclient[3813]: DHCPREQUEST on eno16777736 to 10.0.0.254 port 67 (xid=0x4d17f187)
Mar 14 00:33:42 centos7 dhclient[3813]: DHCPACK from 10.0.0.254 (xid=0x4d17f187)
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那个错误已经不见了,但是重启网卡
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[root@centos7 ~]
# 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@centos7 ~]
#
|
依然是这个错误,然后我又重新百度,说虚拟机设置中的两个连接选项(已连接和启动时连接)没有选择也会报同样的错,但是我的已经连接,问题依然存在,到底是因为什么呢?再次查找方法。
结果这次认真看了日志报错后发现是说eth0这个文件找不到
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Mar 14 00:36:39 centos7 network: Bringing up interface eth0: ERROR : [
/etc/sysconfig/network-scripts/ifup-eth
] Device eth0 does not seem to be present, delaying initialization.
Mar 14 00:36:39 centos7
/etc/sysconfig/network-scripts/ifup-eth
: Device eth0 does not seem to be present, delaying initialization.
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原来是之前做优化的时候将7的网卡名改成了eth0(众所周知7的网卡名是eno后面随机 一串数字),生成菜单时没有生效,那么在此生效一下
注意网卡配置名是已经修改成eth0以后执行下面操作,一共修改的地方有三处,第一处网卡名:/etc/sysconfig/network-scripts/ifcfg-eth0 ,第二处配置文件里面:NAME=eth0 ,第三处也是配置文件里面:DEVICE=eth0
修改/etc/sysconfig/grub,添加net.ifnames=0 biosdevname=0
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[root@centos7 ~]
# cat /etc/sysconfig/grub
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=
"$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=
true
GRUB_TERMINAL_OUTPUT=
"console"
GRUB_CMDLINE_LINUX=
"crashkernel=128M rd.lvm.lv=centos/root rhgb quiet net.ifnames=0 biosdevname=0"
GRUB_DISABLE_RECOVERY=
"true"
[root@centos7 ~]
#
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生成菜单
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[root@centos7 ~]
# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration
file
...
Found linux image:
/boot/vmlinuz-3
.10.0-327.el7.x86_64
Found initrd image:
/boot/initramfs-3
.10.0-327.el7.x86_64.img
Found linux image:
/boot/vmlinuz-0-rescue-8058723e5e754d3aabc51842d9108e3b
Found initrd image:
/boot/initramfs-0-rescue-8058723e5e754d3aabc51842d9108e3b
.img
done
[root@centos7 ~]
#
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最后reboot重启
最后登录后正常