在部署openstack时网卡启动出现如下错误：
[root@controller network-scripts]# service network restart
Restarting network (via systemctl): Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.
[失败]
解决方法：执行ifconfig命令，然后把MAC地址和设备名（就是那个eno16777736那个）两个都记下来，然后分别进去网卡配置文件里对照，如果不一样的就修改为跟ifconfig的一样，如果没有MAC地址就添加HWADDR=xx:xx:xx:xx:xx:xx，最后重启网卡就可以了
我试了一下上面的解决方法好像不行，下面的可以解决。
[root@centos03 etc]# systemctl start rabbitmq-server.serviceJob for rabbitmq-server.service failed. See 'systemctl status rabbitmq-server.service' and 'journalctl -xn' for details.[root@centos03 etc]# systemctl status rabbitmq-server.servicerabbitmq-server.service - RabbitMQ broker Loaded: loaded (/usr/lib/systemd/system/rabbitmq-server.service; enabled) Active: failed (Result: exit-code) since Sun 2015-08-02 10:21:38 CST; 14s ago Process: 12933 ExecStop=/usr/lib/rabbitmq/bin/rabbitmqctl stop (code=exited, status=2) Process: 12903 ExecStart=/usr/lib/rabbitmq/bin/rabbitmq-server (code=exited, status=1/FAILURE)Main PID: 12903 (code=exited, status=1/FAILURE)Aug 02 10:21:38 centos03 rabbitmqctl[12933]: attempted to contact: [rabbit@centos03]Aug 02 10:21:38 centos03 rabbitmqctl[12933]: rabbit@centos03:Aug 02 10:21:38 centos03 rabbitmqctl[12933]: * unable to connect to epmd (port 4369) on centos03: timeout (timed out)Aug 02 10:21:38 centos03 rabbitmqctl[12933]: current node details:Aug 02 10:21:38 centos03 rabbitmqctl[12933]: - node name: rabbitmqctl12933@centos03Aug 02 10:21:38 centos03 rabbitmqctl[12933]: - home dir: /var/lib/rabbitmqAug 02 10:21:38 centos03 rabbitmqctl[12933]: - cookie hash: 3OJgstuIK3NwuZx0RgIoGA==Aug 02 10:21:38 centos03 systemd[1]: rabbitmq-server.service: control process exited, code=exited status=2Aug 02 10:21:38 centos03 systemd[1]: Failed to start RabbitMQ broker.Aug 02 10:21:38 centos03 systemd[1]: Unit rabbitmq-server.service entered failed state. 解决办法：查看/etc/hosts是否配置正确重新启动
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