service network start命令啟動時報錯：

[root@localhost network-scripts]# service network start

Starting network (via systemctl):? Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn' for details.[FAILED][root@localhost network-scripts]# systemctl status network.servicenetwork.service - LSB: Bring up/down networking?? Loaded: loaded (/etc/rc.d/init.d/network)?? Active: failed (Result: exit-code) since Sat 2015-03-07 02:53:12 EST; 6s ago? Process: 8596 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)Mar 07 02:53:12 localhost.localdomain network[8596]: RTNETLINK answers: File ...Mar 07 02:53:12 localhost.localdomain network[8596]: RTNETLINK answers: File ...Mar 07 02:53:12 localhost.localdomain network[8596]: RTNETLINK answers: File ...Mar 07 02:53:12 localhost.localdomain network[8596]: RTNETLINK answers: File ...Mar 07 02:53:12 localhost.localdomain network[8596]: RTNETLINK answers: File ...Mar 07 02:53:12 localhost.localdomain network[8596]: RTNETLINK answers: File ...Mar 07 02:53:12 localhost.localdomain systemd-sysctl[8913]: Overwriting earli...Mar 07 02:53:12 localhost.localdomain systemd[1]: network.service: control pr...Mar 07 02:53:12 localhost.localdomain systemd[1]: Failed to start LSB: Bring ...Mar 07 02:53:12 localhost.localdomain systemd[1]: Unit network.service entere...Hint: Some lines were ellipsized, use -l to show in full.

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然后網上搜是因為沒加HWADDR....這個我確實給刪了....

先看log里說哪個網卡沒有UP起來：

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[root@localhost network-scripts]# cat /var/log/messages | grep network

Mar? 7 03:05:18 localhost kernel: drop_monitor: Initializing network drop monitor serviceMar? 7 03:05:19 localhost systemd-udevd[413]: renamed network interface eth1 to enp1s0f1Mar? 7 03:05:19 localhost systemd-udevd[416]: renamed network interface eth5 to enp8s0f3Mar? 7 03:05:19 localhost systemd-udevd[421]: renamed network interface eth3 to enp8s0f1Mar? 7 03:05:19 localhost systemd-udevd[429]: renamed network interface eth4 to enp8s0f2Mar? 7 03:05:19 localhost systemd-udevd[411]: renamed network interface eth0 to enp1s0f0Mar? 7 03:05:19 localhost systemd-udevd[419]: renamed network interface eth2 to enp8s0f0Mar? 7 03:05:25 localhost systemd-udevd[412]: renamed network interface eth1 to enp3s0f1Mar? 7 03:05:25 localhost systemd-udevd[414]: renamed network interface eth3 to enp131s0f1Mar? 7 03:05:25 localhost systemd-udevd[411]: renamed network interface eth0 to enp3s0f0Mar? 7 03:05:25 localhost systemd-udevd[413]: renamed network interface eth2 to enp131s0f0Mar? 7 03:05:25 localhost systemd-udevd[415]: renamed network interface eth4 to enp134s0f0Mar? 7 03:05:25 localhost systemd-udevd[416]: renamed network interface eth5 to enp134s0f1Mar? 7 03:05:30 localhost systemd: Starting Import network configuration from initramfs...Mar? 7 03:05:30 localhost systemd: Started Import network configuration from initramfs.Mar? 7 03:05:40 localhost systemd: Starting Rollback uncommitted netcf network config change transactions...Mar? 7 03:05:40 localhost systemd: Started Rollback uncommitted netcf network config change transactions.Mar? 7 03:05:43 localhost systemd: Starting LSB: Bring up/down networking...Mar? 7 03:05:45 localhost network: Bringing up loopback interface:? [? OK? ]Mar? 7 03:05:45 localhost network: Bringing up interface br0:? ERROR??? : [/etc/sysconfig/network-scripts/ifup-eth] Device br0 does not seem to be present, delaying initialization.Mar? 7 03:05:45 localhost /etc/sysconfig/network-scripts/ifup-eth: Device br0 does not seem to be present, delaying initialization.Mar? 7 03:05:45 localhost network: [FAILED]Mar? 7 03:05:45 localhost network: Bringing up interface enp1s0f0:? [? OK? ]Mar? 7 03:05:45 localhost network: Bringing up interface enp8s0f0:? ERROR??? : [/etc/sysconfig/network-scripts/ifup-eth] Device? does not seem to be present, delaying initialization.Mar? 7 03:05:45 localhost /etc/sysconfig/network-scripts/ifup-eth: Device? does not seem to be present, delaying initialization.Mar? 7 03:05:45 localhost network: [FAILED]Mar? 7 03:05:45 localhost network: Bringing up interface enp8s0f1:? ERROR??? : [/etc/sysconfig/network-scripts/ifup-eth] Device? does not seem to be present, delaying initialization.Mar? 7 03:05:45 localhost /etc/sysconfig/network-scripts/ifup-eth: Device? does not seem to be present, delaying initialization.Mar? 7 03:05:45 localhost network: [FAILED]Mar? 7 03:05:45 localhost systemd: network.service: control process exited, code=exited status=1Mar? 7 03:05:45 localhost systemd: Failed to start LSB: Bring up/down networking.Mar? 7 03:05:45 localhost systemd: Unit network.service entered failed state.Mar? 7 03:05:48 localhost xinetd[1863]: xinetd Version 2.3.15 started with libwrap loadavg labeled-networking options compiled in.

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ip addr查看這倆網卡的MAC：

[root@localhost network-scripts]# ip addr

1: lo: mtu 65536 qdisc noqueue state UNKNOWN ??? 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 ?????? valid_lft forever preferred_lft forever2: enp1s0f0: mtu 1500 qdisc mq master br0 state UP qlen 1000??? link/ether 00:25:90:64:a9:30 brd ff:ff:ff:ff:ff:ff??? inet6 fe80::225:90ff:fe64:a930/64 scope link ?????? valid_lft forever preferred_lft forever3: enp1s0f1: mtu 1500 qdisc noop state DOWN qlen 1000??? link/ether 00:25:90:64:a9:31 brd ff:ff:ff:ff:ff:ff4: enp8s0f0: mtu 1500 qdisc noop state DOWN qlen 1000??? link/ether 00:0c:bd:05:4e:cc brd ff:ff:ff:ff:ff:ff5: enp8s0f1: mtu 1500 qdisc noop state DOWN qlen 1000??? link/ether 00:0c:bd:05:4e:cd brd ff:ff:ff:ff:ff:ff6: enp8s0f2: mtu 1500 qdisc noop state DOWN qlen 1000??? link/ether 00:0c:bd:05:4e:ce brd ff:ff:ff:ff:ff:ff7: enp8s0f3: mtu 1500 qdisc noop state DOWN qlen 1000??? link/ether 00:0c:bd:05:4e:cf brd ff:ff:ff:ff:ff:ff

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然后把這倆網卡的mac寫到配置文件里：

/etc/sysconfig/network-scripts/ifcfg-enp8s0f0

/etc/sysconfig/network-scripts/ifcfg-enp8s0f1

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添加：

HWADDR=00:0c:bd:05:4e:cc?

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然后重新啟動network，就OK啦！

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很久沒更新了，其實問題不一定是MAC的問題，也有其他的可能性。下面是另一種情況：

虛擬機里邊的CentOS7重啟之后無法聯網了，重啟network發現報錯。

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百度了一圈，都是叫修改mac地址的說法，但是改了之后并沒有什么用，最后谷歌解決了。

事實證明百度就是個水貨！

解決方式：禁用NetworkManager

1. systemctl stop NetworkManager

2. systemctl disable NetworkManager

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然后重啟網絡服務，能正常聯網了！

總結

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