启动网卡报错（FailedtostartLSB：Bringupdownnetworking。。。

启动⽹卡报错（FailedtostartLSB：Bringupdownnetworking。

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
[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 ~]#1.2.3.
按照提⽰输⼊systemctl status network.service查看
[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.1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.
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
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:0c:15:49 brd ff:ff:ff:ff:ff:ff1.2.
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）
HWADDR=00:0c:29:0c:15:491.
重启⽣效
[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 ~]#1.2.3.
发现依然有这个错误
查看启动⽇志
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.1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.
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
systemctl enable NetworkManager-wait-online.service1.
然后重启⽹卡
[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 ~]#1.2.3.
查看⽇志
Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'1.
这个错误依然存在
systemctl stop NetworkManager
systemctl disable NetworkManager1.2.
将 NetworkManager关闭，然后重启⽹卡，查看⽇志
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)1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.
那个错误已经不见了，但是重启⽹卡
[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 ~]#1.2.3.
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
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.1.2.
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
[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 ~]#1.2.3.4.5.6.7.8.9.
⽣成菜单
[root@centos7 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Found linux p_w_picpath: /boot/vmlinuz-3.10.0-327.el7.x86_64
Found initrd p_w_picpath: /boot/initramfs-3.10.0-327.el7.x86_64.img
Found linux p_w_picpath: /boot/vmlinuz-0-rescue-8058723e5e754d3aabc51842d9108e3b
Found initrd p_w_picpath: /boot/initramfs-0-rescue-8058723e5e754d3aabc51842d9108e3b.img
done
[root@centos7 ~]#1.2.3.4.5.6.7.8.
最后reboot重启
最后登录后正常。