linux启动网卡之"Device eth0 does not seem to be present, delaying initialization"错误解决方法

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背景描述：prometheus服务器总是出现两个小时内断开外部连接，导致prometheus和grafana提供的web服务无法访问，ssh工具连不上机器，故选择了重启实例，可是在重启实例后再次出现此般状况，
故对服务器系统进行排查，经排查后定位到实例的网卡出现了以下问题：

[root@prometheus /var/log]# 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 二 2021-08-17 18:02:07 CST; 7h left
     Docs: man:systemd-sysv-generator(8)
  Process: 1172 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
   CGroup: /system.slice/network.service
           └─1359 /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient--ens5.lease -pf /var/run/dhclient-ens5.pid -H prometheus ens5

8月 17 18:02:05 prometheus dhclient[1301]: DHCPACK from 172.31.32.1 (xid=0x41460a8e)
8月 17 18:02:07 prometheus dhclient[1301]: bound to 172.31.44.100 -- renewal in 1762 seconds.
8月 17 18:02:07 prometheus network[1172]: Determining IP information for ens5... done.
8月 17 18:02:07 prometheus network[1172]: [  OK  ]
8月 17 18:02:07 prometheus network[1172]: Bringing up interface eth0:  ERROR     : [/etc/sysconfig/network-scripts/ifup-eth] Device eth0 does not seem to be present, delaying initialization.
8月 17 18:02:07 prometheus network[1172]: [FAILED]
8月 17 18:02:07 prometheus systemd[1]: network.service: control process exited, code=exited status=1
8月 17 18:02:07 prometheus systemd[1]: Failed to start LSB: Bring up/down networking.
8月 17 18:02:07 prometheus systemd[1]: Unit network.service entered failed state.
8月 17 18:02:07 prometheus systemd[1]: network.service failed.

第一次发现问题后经过重启网络发现如下：

[root@prometheus /var/log]# 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@prometheus /var/log]# 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 二 2021-08-17 10:13:20 CST; 9s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 11979 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
   CGroup: /system.slice/network.service
           └─1359 /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient--ens5.lease -pf /var/run/dhclient-ens5.pid -H prometheus ens5

8月 17 10:13:20 prometheus network[11979]: RTNETLINK answers: File exists
8月 17 10:13:20 prometheus network[11979]: RTNETLINK answers: File exists
8月 17 10:13:20 prometheus network[11979]: RTNETLINK answers: File exists
8月 17 10:13:20 prometheus network[11979]: RTNETLINK answers: File exists
8月 17 10:13:20 prometheus network[11979]: RTNETLINK answers: File exists
8月 17 10:13:20 prometheus network[11979]: RTNETLINK answers: File exists
8月 17 10:13:20 prometheus systemd[1]: network.service: control process exited, code=exited status=1
8月 17 10:13:20 prometheus systemd[1]: Failed to start LSB: Bring up/down networking.
8月 17 10:13:20 prometheus systemd[1]: Unit network.service entered failed state.
8月 17 10:13:20 prometheus systemd[1]: network.service failed.

故在网上寻找了有关"Device eth0 does not seem to be present, delaying initialization","RTNETLINK answers: File exists"两个问题的解决；

故在网上寻找了有关"Device eth0 does not seem to be present, delaying initialization","RTNETLINK answers: File exists"两个问题的解决；

网上的方法大致如下：
第一种：和 NetworkManager 服务有冲突，直接关闭 NetworkManger 服务， service NetworkManager stop，并且禁止开机启动 chkconfig NetworkManager off 。之后重启。（我尝试了，发现机器里并没有NetworkManager服务，故不可）

第二种：和配置文件的MAC地址不匹配，修改 /etc/udev/rules.d/70-persistent-net.rules文件的MAC地址和 /etc/sysconfig/network-scripts/ifcfg-eth5一样。（我尝试了，aws实例中并没有网卡配置并没有MAC地址，故不可）

第三种：ip addr flush dev eth5（尝试后，未能解决）。

问题解决：

在发现主机ip绑定的是ens5这张网卡，而报错中出现"Device eth0 does not seem to be present" 推测可能是aws中eth0这张网卡影响了eth5网卡的启动，后经操作重启网卡成功；操作如下：

[root@prometheus /etc/sysconfig/network-scripts]# mv ifcfg-eth0 /root
[root@prometheus /etc/sysconfig/network-scripts]# kill -9 1359
[root@prometheus /etc/sysconfig/network-scripts]# rm -rf /var/lib/dhclient/dhclient--ens5.lease /var/run/dhclient-ens5.pid /etc/udev/rules.d/70-persistent-net.rules
[root@prometheus /etc/sysconfig/network-scripts]# systemctl restart network(这里已经重启成功)
[root@prometheus /etc/sysconfig/network-scripts]# systemctl status network
● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: active (running) since 二 2021-08-17 11:34:47 CST; 8min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 25605 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 25782 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/network.service
           └─25966 /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient--ens5.lease -pf /var/run/dhclient-ens5.pid -H prometheus ens5

8月 17 11:34:45 prometheus systemd[1]: Starting LSB: Bring up/down networking...
8月 17 11:34:45 prometheus network[25782]: Bringing up loopback interface:  [  OK  ]
8月 17 11:34:45 prometheus network[25782]: Bringing up interface ens5:
8月 17 11:34:45 prometheus dhclient[25911]: DHCPREQUEST on ens5 to 255.255.255.255 port 67 (xid=0x3567fc41)
8月 17 11:34:45 prometheus dhclient[25911]: DHCPACK from 172.31.32.1 (xid=0x3567fc41)
8月 17 11:34:47 prometheus dhclient[25911]: bound to 172.31.44.100 -- renewal in 1363 seconds.
8月 17 11:34:47 prometheus network[25782]: Determining IP information for ens5... done.
8月 17 11:34:47 prometheus network[25782]: [  OK  ]
8月 17 11:34:47 prometheus systemd[1]: Started LSB: Bring up/down networking.

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