Centos 7.0 虛拟機遷移網卡問題

三種方法解決 failed to start lsb: bring up/down networking 問題

《—》

1、執行 service network restart 出現以下錯誤

restarting network (via systemctl): job for network.service failed. see ‘systemctl status network.service’ and ‘journalctl -xn’ for details.

2、根據上面的提示，執行“systemctl status network.service”輸出以下的類似資訊：

[root@localhost ~]# systemctl status network.service

network.service - lsb: bring up/down networking

loaded: loaded (/etc/rc.d/init.d/network)

active: failed (result: exit-code) since 三 2014-11-05 15:30:10 cst; 1min 5s ago

11月 05 15:30:10 localhost.localdomain network[2920]: rtnetlink answers: file exists

11月 05 15:30:10 localhost.localdomain systemd[1]: network.service: control process exited, code=exited status=1

11月 05 15:30:10 localhost.localdomain systemd[1]: failed to start lsb: bring up/down networking.

11月 05 15:30:10 localhost.localdomain systemd[1]: unit network.service entered failed state.

3、解決的辦法（由于centos7中沒有70-persistent-net.rules這個檔案，複制出來的虛拟機(vmware）需要修改mac位址），就是修改mac位址。

4、如何檢視centos7複制出來的虛拟機的mac位址，需要執行 “ip addr”，輸出如下的類似資訊：

[root@localhost ~]# ip addr

1: lo:

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

2: eno16777736:

link/ether 00:0f:19:10:12:f1 brd ff:ff:ff:ff:ff:ff

inet 192.168.38.135/24 brd 192.168.38.255 scope global dynamic eno16777736

valid_lft 1681sec preferred_lft 1681sec

inet6 fe80::20c:11aa:ae11:4fe4/64 scope link

注意上面加粗加紅的字，這就是新的mac位址。

接下來就剩下修改ifcfg-xxx檔案了，隻修改hwaddr就可以了。接下來執行service network restart 就正常了。

《二》

如果還是啟動失敗 檢視是否有如下錯誤資訊

nov 23 22:09:07 hdcoe02 network[597]: bringing up loopback interface: could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’

nov 23 22:09:07 hdcoe02 network[597]: could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’

nov 23 22:09:08 hdcoe02 network[597]: could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’

nov 23 22:09:08 hdcoe02 network[597]: could not load file ‘/etc/sysconfig/network-scripts/ifcfg-lo’ nov 23 22:09:08 hdcoe02 network[597]: [ ok ]

nov 23 22:09:08 hdcoe02 network[597]: bringing up interface enp0s25: error: connection activation failed: connection ‘enp0s25’ is not available on the device enp0s25 at this time.

設定開機啟動一個名為networkmanager-wait-online服務，指令為：

systemctl enable networkmanager-wait-online.service

《三》

我也是上面方法都測試完了 一直不成功，最後發現時因為在vmware 虛拟機裡面的系統 右上角顯示的連接配接都沒有連接配接上，雖然報錯都一樣，最後我在虛拟機設定裡面将原來的網絡擴充卡删掉，重建立了一個新的網絡擴充卡，這次進去，顯示連接配接成功，再用上面的方法，問題解決。

原文：http://www.myexception.cn/ai/1952747.html